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• How to initialize List<E> in empty class constructor?

  - by Nazgulled

  Hi, The following code obviously doesn't work because List<E> is abstract: public class MyList { private List<E> list; public MyList() { this.list = new List<E>(); } } How can I initialize MyList class with an empty constructor if I need the list variable to be a LinkedList or a ArrayList depending on my needs?

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• a constructor as a delegate - is it possible in C#?

  - by akavel

  I have a class like below: class Foo { public Foo(int x) { ... } } and I need to pass to a certain method a delegate like this: delegate Foo FooGenerator(int x); Is it possible to pass the constructor directly as a FooGenerator value, without having to type: delegate(int x) { return new Foo(x); } ? EDIT: For my personal use, the question refers to .NET 2.0, but hints/responses for 3.0+ are welcome as well.

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• Can't I send NULL as a parameter with a constructor?

  - by Jason94

  Lets say i have a Shape object that has a constructor like this: Shape( width, height, radius, depth ) Now, I just have a silly rect so i dont need redius and depth... is it okey to do Shape myRect(50, 50, NULL, NULL) ? I know its not the best idea and I should use inheritance and stuff but this is the mess im in so can i use NULL like this?

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• Is there a better way to set lots of required properties than sending as parameters in a Constructor

  - by TooFat

  I have a class that in order to do it's job needs to have 8 different property values set. I want to make sure that all 8 properties are set before trying to execute a method. I currently have all the parameters passed in and set via the constructor. Is there a better way to do this?

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• How to add a constructor to a subclassed numeric type?

  - by abbot

  I want to subclass a numeric type (say, int) in python and give it a shiny complex constructor. Something like this: class NamedInteger(int): def __init__(self, value): super(NamedInteger, self).__init__(value) self.name = 'pony' def __str__(self): return self.name x = NamedInteger(5) print x + 3 print str(x) This works fine under Python 2.4, but Python 2.6 gives a deprecation warning. What is the best way to subclass a numeric type and to redefine constructors for builtin types in newer Python versions?

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• C++, is it possible to call a constructor directly, without new?

  - by osgx

  Hello Can I call constructor explicitly, without using new, if I already have a memory for object? // class Object1{char *str;public:Object1(char*str):str(str){puts("ctor");puts(str);};~Object1(){puts("dtor");puts(str);}}; Object1 ooo[2] = {Object1("I'm the first object"), Object1("I'm the 2nd")}; do_smth_useful(ooo); ooo[0].~Object1(); // call destructor ooo[0].Object1("I'm the 3rd object in place of first"); // ???? - reuse memory

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• How is the default constructor of System.Drawing.Graphics removed?

  - by Albert Iordache

  When I try to create an object of Graphics, why doesn't the following work? System.Drawing.Graphics graphicsObj = new System.Drawing.Graphics(); (I am aware that I could create a private System.Windows.Forms.Panel Obj; and then do CreateGraphics() if I wanted it to work) I tried to find a custom constructor for Graphics, but I couldn't find one. Where did Microsoft define it, or how did it block it?

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• What does a static modifier on a constructor means?

  - by the_drow

  I saw this kind of code at work: class FooPlugin : IPlugin // IPlugin is a Microsoft CRM component, it has something special about it's execution { static FooPlugin() { SomeObject.StaticFunction(); // The guy who wrote it said it's meaningful to this question but he can't remember why. } } Any idea what does a static modifier on a constructor mean and why in this case it is required?

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• When is it important to have a public parameterless constructor in C#?

  - by raven

  I'm trying to understand the constraints on generic type parameters in C#. What is the purpose of the where T : new() constraint? Why would you need to insist that the type argument have a public parameterless constructor?

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• JavaScript inheritance extend function

  - by Zach

  I'm having some trouble understanding the IF clause at the end of this function from Pro JavaScript Design Patterns: function extend(subClass, superClass) { var F = function() {}; F.prototype = superClass.prototype; subClass.prototype = new F(); subClass.prototype.constructor = subClass; subClass.superclass = superClass.prototype; if(superClass.prototype.constructor == Object.prototype.constructor) { superClass.prototype.constructor = superClass; } } The book explains that these lines ensure that the superclass's constructor attribute is correctly set, even if the superclass is the Object class itself. Yet, if I omit those three lines and do the following: function SubClass() {}; extend(SubClass, Object); alert(Object.prototype.constructor == Object); The alert says 'true', which means the superclass's constructor is set correctly even without those last three lines. Under what conditions, then, does this IF statement do something useful? Thanks.

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• Where should I put zoomIn in my MapActivity?

  - by Johny

  I'm writing an Android app, and I'd like to zoomIn as soon as the map has been loaded. I get the following error: java.lang.IllegalArgumentException: width and height must be > 0 This MapActivity - width and height must be > 0 question suggests the problem is the zoomIn() method is in the onCreate() method. But I get same error when I put it in the onResume() method. I've been searching for hours and I can't find anything about it at http://developer.android.com or anywhere else... Also I can't find a way to get the time point the map has been loaded. A "MapLoadedListener" or something like that... EDIT Here is my code: public class AMap extends MapActivity{ private final String LOG_TAG = this.getClass().getSimpleName(); private Context mContext; private Chronometer timer; private TextView tvCountdown; private RelativeLayout rl; private MapView mapView; private MapController mapController; private List<Overlay> mapOverlays; private PlayersOverlay playersOverlay; private Drawable drawable; private Builder endDialog; private ContextThemeWrapper ctw; private Handler mHandler = new Handler(); private Player player = new Player(); private StartTask startTask; private EndTask endTask; private MyDBAdapter mdba; private Cursor playersCursor; private UpdateBroadcastReceiver r; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.map_view); mContext = AMap.this; // set map mapView = (MapView) findViewById(R.id.mapview); mapView.setBuiltInZoomControls(true); mapView.setFocusable(true); // find the relative layout rl = (RelativeLayout) findViewById(R.id.rl); // set the chronometer timer = (Chronometer) findViewById(R.id.tv_timer); timer.setBackgroundColor(Color.DKGRAY); // set the countdown textview tvCountdown = (TextView) findViewById(R.id.tv_countdown); // Open DB connection and get players Cursor mdba = new MyDBAdapter(mContext); mdba.open(); playersCursor = mdba.getGame(); // Get this player's id and location Intent starter = this.getIntent(); player.setId(starter.getIntExtra("id", 0)); player.setLatitude(starter.getDoubleExtra("lat", 0)); player.setLongitude(starter.getDoubleExtra("lon", 0)); // Set this player's location as map's center GeoPoint geoPoint = new GeoPoint((int) (player.getLatitude()*1E6), (int) (player.getLongitude()*1E6)); mapController = mapView.getController(); mapController.setCenter(geoPoint); mapController.setZoom(15); Log.d(LOG_TAG, "My playersCursor has "+playersCursor.getCount()+" rows"); // drawable is needed but not used drawable = this.getResources().getDrawable(R.drawable.ic_launcher); // set PlayersOverlay (locations and statuses) playersOverlay = new PlayersOverlay(player.getId(), playersCursor, drawable, this); mapOverlays = mapView.getOverlays(); mapOverlays.add(playersOverlay); mHandler.postDelayed(mUpdateTimeTask, 100); } private Runnable mUpdateTimeTask = new Runnable() { public void run() { int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, "w = "+w+" , h = "+h); mHandler.postAtTime(this, System.currentTimeMillis() + 1000); } }; @Override public void onAttachedToWindow(){ Log.d(LOG_TAG, "Attached to Window"); int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, " Attached to window: w = "+w+" , h = "+h); //mapController.zoomInFixing(screenPoint.x, screenPoint.y); } public void onWindowFocusChanged(boolean hasFocus){ Log.d(LOG_TAG, "Focus changed to: "+hasFocus); int h = mapView.getLayoutParams().height; int w = mapView.getLayoutParams().width; Log.d(LOG_TAG, " Window focus changed: w = "+w+" , h = "+h); //mapController.zoomInFixing(screenPoint.x, screenPoint.y); } @Override protected void onStart(){ super.onStart(); // Create and register the broadcast receiver for messages from service IntentFilter filter = new IntentFilter(AppConstants.iGAME_UPDATE); r = new UpdateBroadcastReceiver(); registerReceiver(r, filter); // Create the dialog for end of game ctw = new ContextThemeWrapper(mContext, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen); endDialog = new AlertDialog.Builder(ctw); endDialog.setMessage("End of Game"); endDialog.setCancelable(false); endDialog.setNeutralButton("OK", new OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { Intent highScores = new Intent(AMap.this, HighScores.class); startActivity(highScores); playersCursor.close(); finish(); } }); } @Override protected void onStop() { if(!playersCursor.isClosed()) playersCursor.close(); unregisterReceiver(r); mdba.close(); super.onStop(); } @Override protected boolean isRouteDisplayed() { return false; } // Receives signal from NetworkService that DB has been updated public class UpdateBroadcastReceiver extends BroadcastReceiver { boolean startSignal, update, endSignal; @Override public void onReceive(Context context, Intent intent) { endSignal = intent.getBooleanExtra("endSignal", false); if(endSignal){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received End Signal"); endTask = new EndTask(); endTask.execute(); return; } update = intent.getBooleanExtra("update", false); if(update){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received game update"); playersCursor.requery(); mapView.invalidate(); return; } startSignal = intent.getBooleanExtra("startSignal", false); if(startSignal){ Log.d(LOG_TAG, "Game Update BroadcastReceiver received Start Signal"); startTask = new StartTask(); startTask.execute(); return; } } } class StartTask extends AsyncTask<Void,Integer,Void>{ private final ToneGenerator tg = new ToneGenerator(AudioManager.STREAM_NOTIFICATION, 100); private final long DELAY = 1200; @Override protected Void doInBackground(Void... params) { int i = 3; while(i>=0){ publishProgress(i); try { Thread.sleep(DELAY); } catch (InterruptedException e) { e.printStackTrace(); } i--; } return null; } @Override protected void onProgressUpdate(Integer... progress){ tg.startTone(ToneGenerator.TONE_PROP_PROMPT); tvCountdown.setText(""+progress[0]); } @Override protected void onPostExecute(Void result) { rl.removeView(tvCountdown); timer.setBase(SystemClock.elapsedRealtime()); timer.start(); //enable screen touches playersOverlay.setGameStarted(true); } } class EndTask extends AsyncTask<Void,Void,Void>{ @Override protected void onPreExecute(){ //disable screen touches playersOverlay.setEndOfGame(true); timer.stop(); } @Override protected Void doInBackground(Void... params) { return null; } @Override protected void onPostExecute(Void result) { try{ endDialog.show(); }catch(Exception e){ Toast.makeText(mContext, "End of game", Toast.LENGTH_LONG); Intent highScores = new Intent(AMap.this, HighScores.class); startActivity(highScores); playersCursor.close(); finish(); } mHandler.removeCallbacks(mUpdateTimeTask); } } }

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• readonly keyword

  - by nmarun

  This is something new that I learned about the readonly keyword. Have a look at the following class: 1: public class MyClass 2: { 3: public string Name { get; set; } 4: public int Age { get; set; } 5:  6: private readonly double Delta; 7:  8: public MyClass() 9: { 10: Initializer(); 11: } 12:  13: public MyClass(string name = "", int age = 0) 14: { 15: Name = name; 16: Age = age; 17: Initializer(); 18: } 19:  20: private void Initializer() 21: { 22: Delta = 0.2; 23: } 24: } I have a couple of public properties and a private readonly member. There are two constructors – one that doesn’t take any parameters and the other takes two parameters to initialize the public properties. I’m also calling the Initializer method in both constructors to initialize the readonly member. Now when I build this, the code breaks and the Error window says: “A readonly field cannot be assigned to (except in a constructor or a variable initializer)” Two things after I read this message: It’s such a negative statement. I’d prefer something like: “A readonly field can be assigned to (or initialized) only in a constructor or through a variable initializer” But in my defense, I AM assigning it in a constructor (only indirectly). All I’m doing is creating a method that does it and calling it in a constructor. Turns out, .net was not ‘frameworked’ this way. We need to have the member initialized directly in the constructor. If you have multiple constructors, you can just use the ‘this’ keyword on all except the default constructors to call the default constructor. This default constructor can then initialize your readonly members. This will ensure you’re not repeating the code in multiple places. A snippet of what I’m talking can be seen below: 1: public class Person 2: { 3: public int UniqueNumber { get; set; } 4: public string Name { get; set; } 5: public int Age { get; set; } 6: public DateTime DateOfBirth { get; set; } 7: public string InvoiceNumber { get; set; } 8:  9: private readonly string Alpha; 10: private readonly int Beta; 11: private readonly double Delta; 12: private readonly double Gamma; 13:  14: public Person() 15: { 16: Alpha = "FDSA"; 17: Beta = 2; 18: Delta = 3.0; 19: Gamma = 0.0989; 20: } 21:  22: public Person(int uniqueNumber) : this() 23: { 24: UniqueNumber = uniqueNumber; 25: } 26: } See the syntax in line 22 and you’ll know what I’m talking about. So the default constructor gets called before the one in line 22. These are known as constructor initializers and they allow one constructor to call another. The other ‘myth’ I had about readonly members is that you can set it’s value only once. This was busted as well (I recall Adam and Jamie’s show). Say you’ve initialized the readonly member through a variable initializer. You can over-write this value in any of the constructors any number of times. 1: public class Person 2: { 3: public int UniqueNumber { get; set; } 4: public string Name { get; set; } 5: public int Age { get; set; } 6: public DateTime DateOfBirth { get; set; } 7: public string InvoiceNumber { get; set; } 8:  9: private readonly string Alpha = "asdf"; 10: private readonly int Beta = 15; 11: private readonly double Delta = 0.077; 12: private readonly double Gamma = 1.0; 13:  14: public Person() 15: { 16: Alpha = "FDSA"; 17: Beta = 2; 18: Delta = 3.0; 19: Gamma = 0.0989; 20: } 21:  22: public Person(int uniqueNumber) : this() 23: { 24: UniqueNumber = uniqueNumber; 25: Beta = 3; 26: } 27:  28: public Person(string name, DateTime dob) : this() 29: { 30: Name = name; 31: DateOfBirth = dob; 32:  33: Alpha = ";LKJ"; 34: Gamma = 0.0898; 35: } 36:  37: public Person(int uniqueNumber, string name, int age, DateTime dob, string invoiceNumber) : this() 38: { 39: UniqueNumber = uniqueNumber; 40: Name = name; 41: Age = age; 42: DateOfBirth = dob; 43: InvoiceNumber = invoiceNumber; 44:  45: Alpha = "QWER"; 46: Beta = 5; 47: Delta = 1.0; 48: Gamma = 0.0; 49: } 50: } In the above example, every constructor over-writes the values for the readonly members. This is perfectly valid. There is a possibility that based on the way the object is instantiated, the readonly member will have a different value. Well, that’s all I have for today and read this as it’s on a related topic.

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• How to create a simple adf dashboard application with EJB 3.0

  - by Rodrigues, Raphael

  In this month's Oracle Magazine, Frank Nimphius wrote a very good article about an Oracle ADF Faces dashboard application to support persistent user personalization. You can read this entire article clicking here. The idea in this article is to extend the dashboard application. My idea here is to create a similar dashboard application, but instead ADF BC model layer, I'm intending to use EJB3.0. There are just a one small trick here and I'll show you. I'm using the HR usual oracle schema. The steps are: 1. Create a ADF Fusion Application with EJB as a layer model 2. Generate the entities from table (I'm using Department and Employees only) 3. Create a new Session Bean. I called it: HRSessionEJB 4. Create a new method like that: public List getAllDepartmentsHavingEmployees(){ JpaEntityManager jpaEntityManager = (JpaEntityManager)em.getDelegate(); Query query = jpaEntityManager.createNamedQuery("Departments.allDepartmentsHavingEmployees"); JavaBeanResult.setQueryResultClass(query, AggregatedDepartment.class); return query.getResultList(); } 5. In the Departments entity, create a new native query annotation: @Entity @NamedQueries( { @NamedQuery(name = "Departments.findAll", query = "select o from Departments o") }) @NamedNativeQueries({ @NamedNativeQuery(name="Departments.allDepartmentsHavingEmployees", query = "select e.department_id, d.department_name , sum(e.salary), avg(e.salary) , max(e.salary), min(e.salary) from departments d , employees e where d.department_id = e.department_id group by e.department_id, d.department_name")}) public class Departments implements Serializable {...} 6. Create a new POJO called AggregatedDepartment: package oramag.sample.dashboard.model; import java.io.Serializable; import java.math.BigDecimal; public class AggregatedDepartment implements Serializable{ @SuppressWarnings("compatibility:5167698678781240729") private static final long serialVersionUID = 1L; private BigDecimal departmentId; private String departmentName; private BigDecimal sum; private BigDecimal avg; private BigDecimal max; private BigDecimal min; public AggregatedDepartment() { super(); } public AggregatedDepartment(BigDecimal departmentId, String departmentName, BigDecimal sum, BigDecimal avg, BigDecimal max, BigDecimal min) { super(); this.departmentId = departmentId; this.departmentName = departmentName; this.sum = sum; this.avg = avg; this.max = max; this.min = min; } public void setDepartmentId(BigDecimal departmentId) { this.departmentId = departmentId; } public BigDecimal getDepartmentId() { return departmentId; } public void setDepartmentName(String departmentName) { this.departmentName = departmentName; } public String getDepartmentName() { return departmentName; } public void setSum(BigDecimal sum) { this.sum = sum; } public BigDecimal getSum() { return sum; } public void setAvg(BigDecimal avg) { this.avg = avg; } public BigDecimal getAvg() { return avg; } public void setMax(BigDecimal max) { this.max = max; } public BigDecimal getMax() { return max; } public void setMin(BigDecimal min) { this.min = min; } public BigDecimal getMin() { return min; } } 7. Create the util java class called JavaBeanResult. The function of this class is to configure a native SQL query to return POJOs in a single line of code using the utility class. Credits: http://onpersistence.blogspot.com.br/2010/07/eclipselink-jpa-native-constructor.html package oramag.sample.dashboard.model.util; /******************************************************************************* * Copyright (c) 2010 Oracle. All rights reserved. * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 * which accompanies this distribution. * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * @author shsmith ******************************************************************************/ import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import java.util.ArrayList; import java.util.List; import javax.persistence.Query; import org.eclipse.persistence.exceptions.ConversionException; import org.eclipse.persistence.internal.helper.ConversionManager; import org.eclipse.persistence.internal.sessions.AbstractRecord; import org.eclipse.persistence.internal.sessions.AbstractSession; import org.eclipse.persistence.jpa.JpaHelper; import org.eclipse.persistence.queries.DatabaseQuery; import org.eclipse.persistence.queries.QueryRedirector; import org.eclipse.persistence.sessions.Record; import org.eclipse.persistence.sessions.Session; /*** * This class is a simple query redirector that intercepts the result of a * native query and builds an instance of the specified JavaBean class from each * result row. The order of the selected columns musts match the JavaBean class * constructor arguments order. * * To configure a JavaBeanResult on a native SQL query use: * JavaBeanResult.setQueryResultClass(query, SomeBeanClass.class); * where query is either a JPA SQL Query or native EclipseLink DatabaseQuery. * * @author shsmith * */ public final class JavaBeanResult implements QueryRedirector { private static final long serialVersionUID = 3025874987115503731L; protected Class resultClass; public static void setQueryResultClass(Query query, Class resultClass) { JavaBeanResult javaBeanResult = new JavaBeanResult(resultClass); DatabaseQuery databaseQuery = JpaHelper.getDatabaseQuery(query); databaseQuery.setRedirector(javaBeanResult); } public static void setQueryResultClass(DatabaseQuery query, Class resultClass) { JavaBeanResult javaBeanResult = new JavaBeanResult(resultClass); query.setRedirector(javaBeanResult); } protected JavaBeanResult(Class resultClass) { this.resultClass = resultClass; } @SuppressWarnings("unchecked") public Object invokeQuery(DatabaseQuery query, Record arguments, Session session) { List results = new ArrayList(); try { Constructor[] constructors = resultClass.getDeclaredConstructors(); Constructor javaBeanClassConstructor = null; // (Constructor) resultClass.getDeclaredConstructors()[0]; Class[] constructorParameterTypes = null; // javaBeanClassConstructor.getParameterTypes(); List rows = (List) query.execute( (AbstractSession) session, (AbstractRecord) arguments); for (Object[] columns : rows) { boolean found = false; for (Constructor constructor : constructors) { javaBeanClassConstructor = constructor; constructorParameterTypes = javaBeanClassConstructor.getParameterTypes(); if (columns.length == constructorParameterTypes.length) { found = true; break; } // if (columns.length != constructorParameterTypes.length) { // throw new ColumnParameterNumberMismatchException( // resultClass); // } } if (!found) throw new ColumnParameterNumberMismatchException( resultClass); Object[] constructorArgs = new Object[constructorParameterTypes.length]; for (int j = 0; j < columns.length; j++) { Object columnValue = columns[j]; Class parameterType = constructorParameterTypes[j]; // convert the column value to the correct type--if possible constructorArgs[j] = ConversionManager.getDefaultManager() .convertObject(columnValue, parameterType); } results.add(javaBeanClassConstructor.newInstance(constructorArgs)); } } catch (ConversionException e) { throw new ColumnParameterMismatchException(e); } catch (IllegalArgumentException e) { throw new ColumnParameterMismatchException(e); } catch (InstantiationException e) { throw new ColumnParameterMismatchException(e); } catch (IllegalAccessException e) { throw new ColumnParameterMismatchException(e); } catch (InvocationTargetException e) { throw new ColumnParameterMismatchException(e); } return results; } public final class ColumnParameterMismatchException extends RuntimeException { private static final long serialVersionUID = 4752000720859502868L; public ColumnParameterMismatchException(Throwable t) { super( "Exception while processing query results-ensure column order matches constructor parameter order", t); } } public final class ColumnParameterNumberMismatchException extends RuntimeException { private static final long serialVersionUID = 1776794744797667755L; public ColumnParameterNumberMismatchException(Class clazz) { super( "Number of selected columns does not match number of constructor arguments for: " + clazz.getName()); } } } 8. Create the DataControl and a jsf or jspx page 9. Drag allDepartmentsHavingEmployees from DataControl and drop in your page 10. Choose Graph > Type: Bar (Normal) > any layout 11. In the wizard screen, Bars label, adds: sum, avg, max, min. In the X Axis label, adds: departmentName, and click in OK button 12. Run the page, the result is showed below: You can download the workspace here . It was using the latest jdeveloper version 11.1.2.2.

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• Loading GeckoWebBrowser Exceptions

  - by Mostafa Mahdieh

  I get a strange exception when a window containing a GeckoWebBrowser is loaded. This is the exception message: An unhandled exception of type System.Runtime.InteropServices.COMException occurred in Skybound.Gecko.dll Additional information: Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) This is the windows code: public partial class AddContents : Form { String path; public AddContents(String path) { this.path = path; InitializeComponent(); } private void exitToolStripMenuItem_Click(object sender, EventArgs e) { this.Close(); } private void AddContents_Load(object sender, EventArgs e) { geckoWebBrowser1.Navigate(path); } private int selId = 1; private bool updateMode = false; private void timer1_Tick(object sender, EventArgs e) { if (updateMode) update(); } private void geckoWebBrowser1_DocumentCompleted(object sender, EventArgs e) { timer1.Enabled = true; updateMode = true; } private void treeView1_AfterSelect(object sender, TreeViewEventArgs e) { geckoWebBrowser1.Navigate("javascript:scrollToBookmark(" + treeView1.SelectedNode.Tag + ")"); TreeNode selected = treeView1.SelectedNode; TreeNode prev = selected.PrevNode; TreeNode next = selected.PrevNode; if (prev == null) upButton.Enabled = false; if (next == null) downButton.Enabled = false; } private void update() { geckoWebBrowser1.Navigate("javascript:updateSelText()"); GeckoElement el = geckoWebBrowser1.Document.GetElementById("sel_result_991231"); if (el != null) { textBox1.Text = el.InnerHtml; addButton.Enabled = !textBox1.Text.Trim().Equals(String.Empty); } } private void textBox1_Enter(object sender, EventArgs e) { updateMode = false; } private void geckoWebBrowser1_DomMouseDown(object sender, GeckoDomMouseEventArgs e) { updateMode = true; update(); } private void geckoWebBrowser1_DomMouseUp(object sender, GeckoDomMouseEventArgs e) { updateMode = false; } private void addButton_Click(object sender, EventArgs e) { geckoWebBrowser1.Navigate("javascript:addIdToSel()"); TreeNode t = new TreeNode(textBox1.Text); t.Tag = selId; treeView1.Nodes.Add(t); selId++; } }

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• using ResultSet.Previous method not working in Java using .mdb file OBDC

  - by jsonnie

  Hello, I'm currently having an issue with my open result set not working how I believe it should. The only function that is currently working is the next() method, nothing else will work. If the project is placed into a debug mode you can follow through actionperformed event on the button it hits the previous() method and jumps over the remaining code in the method. If someone could point me in the right direction it would be truly appreciated. FORM CODE: import java.sql.; import javax.swing.; public class DataNavigator extends javax.swing.JFrame { public DataInterface db = null; public Statement s = null; public Connection con = null; public PreparedStatement stmt = null; public ResultSet rs = null; /** Creates new form DataNavigator */ public DataNavigator() { initComponents(); try { db = new DataInterface("jdbc:odbc:CMPS422"); con = db.getConnection(); stmt = con.prepareStatement("SELECT * FROM Products"); rs = stmt.executeQuery(); rs.last(); } catch (Exception e) { } } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { btnFirst = new javax.swing.JButton(); btnNext = new javax.swing.JButton(); btnLast = new javax.swing.JButton(); btnUpdate = new javax.swing.JButton(); btnInsert = new javax.swing.JButton(); btnDelete = new javax.swing.JButton(); txtPartNum = new javax.swing.JTextField(); txtDesc = new javax.swing.JTextField(); txtQty = new javax.swing.JTextField(); txtPrice = new javax.swing.JTextField(); jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); jLabel4 = new javax.swing.JLabel(); btnPrev = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("Assignment 3 Data Navigator"); addWindowListener(new java.awt.event.WindowAdapter() { public void windowOpened(java.awt.event.WindowEvent evt) { formWindowOpened(evt); } }); btnFirst.setText("First"); btnFirst.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnFirstActionPerformed(evt); } }); btnNext.setText("Next"); btnNext.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnNextActionPerformed(evt); } }); btnLast.setText("Last"); btnLast.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnLastActionPerformed(evt); } }); btnUpdate.setText("Update"); btnInsert.setText("Insert"); btnDelete.setText("Delete"); jLabel1.setText("Part Number:"); jLabel2.setText("Description:"); jLabel3.setText("Quantity:"); jLabel4.setText("Price:"); btnPrev.setText("Prev"); btnPrev.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { btnPrevMouseClicked(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(btnFirst) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(2, 2, 2) .addComponent(btnPrev) .addGap(4, 4, 4) .addComponent(btnNext) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(btnLast)) .addComponent(jLabel1) .addComponent(jLabel2) .addComponent(jLabel3) .addComponent(jLabel4)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(txtPartNum) .addGroup(layout.createSequentialGroup() .addComponent(btnUpdate) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(btnInsert) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(btnDelete)) .addComponent(txtDesc) .addComponent(txtQty) .addComponent(txtPrice)) .addContainerGap(71, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(btnFirst) .addComponent(btnNext) .addComponent(btnLast) .addComponent(btnUpdate) .addComponent(btnInsert) .addComponent(btnDelete) .addComponent(btnPrev)) .addGap(66, 66, 66) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(jLabel1) .addComponent(txtPartNum, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(txtDesc, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel2)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(txtQty, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel3)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(txtPrice, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jLabel4)) .addContainerGap(102, Short.MAX_VALUE)) ); pack(); }// </editor-fold> private void formWindowOpened(java.awt.event.WindowEvent evt) { try { this.txtPartNum.setText(rs.getString("Partnum")); this.txtDesc.setText(rs.getString("Description")); this.txtPrice.setText(rs.getString("Price")); this.txtQty.setText(rs.getString("Quantity")); } catch (SQLException e) { } } private void btnNextActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try { System.out.println(rs.getCursorName()); rs.next(); rs.moveToCurrentRow(); System.out.println(rs.getCursorName()); this.txtPartNum.setText(rs.getString("Partnum")); this.txtDesc.setText(rs.getString("Description")); this.txtPrice.setText(rs.getString("Price")); this.txtQty.setText(rs.getString("Quantity")); System.out.println(rs.getRow()); } catch (Exception e) { } } private void btnLastActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try { rs.last(); this.txtPartNum.setText(rs.getString("Partnum")); this.txtDesc.setText(rs.getString("Description")); this.txtPrice.setText(rs.getString("Price")); this.txtQty.setText(rs.getString("Quantity")); } catch (Exception e) { } } private void btnFirstActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: try { rs.first(); this.txtPartNum.setText(rs.getString("Partnum")); this.txtDesc.setText(rs.getString("Description")); this.txtPrice.setText(rs.getString("Price")); this.txtQty.setText(rs.getString("Quantity")); } catch (Exception e) { } } private void btnPrevMouseClicked(java.awt.event.MouseEvent evt) { // TODO add your handling code here: try { int i; i = rs.getRow(); if (i > 0) { rs.previous(); System.out.println(rs.getRow()); this.txtPartNum.setText(rs.getString("Partnum")); this.txtDesc.setText(rs.getString("Description")); this.txtPrice.setText(rs.getString("Price")); this.txtQty.setText(rs.getString("Quantity")); } else { System.out.println("FALSE"); } } catch (Exception e) { } } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new DataNavigator().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton btnDelete; private javax.swing.JButton btnFirst; private javax.swing.JButton btnInsert; private javax.swing.JButton btnLast; private javax.swing.JButton btnNext; private javax.swing.JButton btnPrev; private javax.swing.JButton btnUpdate; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JTextField txtDesc; private javax.swing.JTextField txtPartNum; private javax.swing.JTextField txtPrice; private javax.swing.JTextField txtQty; // End of variables declaration } CLASS OBJECT CODE: import java.sql.*; import javax.swing.JOptionPane; public class DataInterface { private static DataInterface dbint = null; private static Connection conn = null; // connection object. private static ResultSet rset = null; public DataInterface(String ODBCDSN) { try { // See if the driver is present. Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); // Open connection to database. conn = DriverManager.getConnection(ODBCDSN); JOptionPane.showMessageDialog(null, "Database successfully opened"); } catch (Exception e) { JOptionPane.showMessageDialog(null, e.toString()); } } public Connection getConnection() { return conn; } public static DataInterface getInstance() { return dbint; } public static ResultSet getResultSet() { return rset; } public PreparedStatement setStatement(String a) throws SQLException{ PreparedStatement stmt = conn.prepareStatement(a); return stmt; }

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• [hibernate - jpa] @OneToOne annotoation problem (i think...)

  - by blow

  Hi all, im new in hibernate and JPA and i have some problems with annotations. My target is to create this table in db (PERSON_TABLE with personal-details) ID ADDRESS NAME SURNAME MUNICIPALITY_ID First of all, i have a MUNICIPALITY table in db containing all municipality of my country. I mapped this table in this ENTITY: @Entity public class Municipality implements Serializable { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private Long id; private String country; private String province; private String name; @Column(name="cod_catasto") private String codCatastale; private String cap; public Municipality() { } ... Then i make an EMBEDDABLE class Address containing fields that realize a simple address... @Embeddable public class Address implements Serializable { @OneToOne(cascade=CascadeType.ALL) @JoinColumn(name="id_municipality") private Municipality municipality; @Column(length=45) private String address; public Address() { } ... Finally i embedded this class into Person ENTITY @Entity public class Person implements Serializable { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) private Long id; private String name; private String surname; @Embedded private Address address; public Person() { } ... All works good when i have to save a new Person record, in fact hibernate creates a PERSON_TABLE as i want, but if i try to retrieve a Person record i have an exception. HQL is simply "from Person" The excpetion is (Entities is the package containing all classes above-mentioned): org.hibernate.AnnotationException: @OneToOne or @ManyToOne on Entities.Person.address.municipality references an unknown entity: Entities.Municipality Is the @OneToOne annotation the problem? Thanks.

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• C# Virtual method call in constructor - how to refactor?

  - by Cristi Diaconescu

  I have an abstract class for database-agnostic cursor actions. Derived from that, there are classes that implement the abstract methods for handling database-specific stuff. The problem is, the base class ctor needs to call an abstract method - when the ctor is called, it needs to initialize the database-specific cursor. I know why this shouldn't be done, I don't need that explanation! This is my first implementation, that obviously doesn't work - it's the textbook "wrong way" of doing it. The overridden method accesses a field from the derived class, which is not yet instantiated: public abstract class CursorReader { private readonly int m_rowCount; protected CursorReader() { m_rowCount = CreateCursor(sqlCmd); //virtual call ! } protected abstract int CreateCursor(string sqlCmd); } public class SqlCursorReader : CursorReader { private SqlConnection m_sqlConnection; public SqlCursorReader(string sqlCmd, SqlConnection sqlConnection) { m_sqlConnection = sqlConnection; //field initialized here } protected override int CreateCursor(string sqlCmd) { //uses not-yet-initialized member *m_sqlConnection* //so this throws a NullReferenceException var cursor = new CustomCursor(sqlCmd, m_sqlConnection); return cursor.Count(); } } I will follow up with an answer on my attempts to fix this...

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• How to rename an private file of my application?

  - by Ungureanu Liviu

  Hi! I want to rename an context private file created with openFileOutput() but I don't know how... I tried that: File file = getFileStreamPath(optionsMenuView.getPlaylistName()); // this file already exists try { FileOutputStream outStream = openFileOutput(newPlaylistName, Context.MODE_WORLD_READABLE); // i create a new file with the new name outStream.close(); } catch (FileNotFoundException e) { Log.e(TAG, "file not found!"); e.printStackTrace(); } catch (IOException e) { Log.e(TAG, "IO exception"); e.printStackTrace(); } Log.e(TAG, "rename status: " + file.renameTo(getFileStreamPath(newPlaylistName))); //it return true This code throw FileNotFoundException but the documentation said "Open a private file associated with this Context's application package for writing. Creates the file if it doesn't already exist." so the new file should be created on disk. The problem: When I try to read from the new renamed file I got FileNotFoundException! Thank you!

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• Hibernate JPA Caching Problem, Please help!

  - by Sameer Malhotra

  Ok, Here is my problem. I have a table named Master_Info_tbl. Its a lookup table: Here is the code for the table: @Entity @Table(name="MASTER_INFO_T") public class CodeValue implements java.io.Serializable { private static final long serialVersionUID = -3732397626260983394L; private Integer objectid; private String codetype; private String code; private String shortdesc; private String longdesc; private Integer dptid; private Integer sequen; private Timestamp begindate; private Timestamp enddate; private String username; private Timestamp rowlastchange; //getter Setter methods I have a service layer which calls the method       service.findbycodeType("Code1");   same way this table is queried for the other code types as well e.g. code2, code3 and so on till code10 which gets the result set from the same table and is shown into the drop down of the jsp pages since these drop downs are in 90% of the pages I am thinking to cache them globally. Any idea how to achieve this? FYI: I am using JPA and Hibernate with Struts2 and Spring. The database being used is DB2 UDB8.2 Please help!

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• Javascript (using jQuery) in a large Project... organization, passing data, private method, etc.

  - by gaoshan88

  I'm working on a large project that is organized like so: Multiple javascript files are included as needed and most code is wrapped in anonymous functions... // wutang.js //Included Files Go Here // Public stuff var MethodMan; // Private stuff (function() { var someVar1; MethodMan = function(){...}; var APrivateMethod = function(){...}; $(function(){ //jquery page load stuff here $('#meh').click(APrivateMethod); }); })(); I'm wondering about a few things here. Assuming that there are a number of these files included on a page, what has access to what and what is the best way to pass data between the files? For example, I assume that MethodMan() can be accessed by anything on any included page. It is public, yes? var someVar1 is only accessible to the methods inside that particular anonymous function and nowhere else, yes? Also true of var APrivateMethod(), yes? What if I want APrivateMethod() to make something available to some other method in a different anonymous wrapped method in a different included page. What's the best way to pass data between these private, anonymous functions on different included pages? Do I simply have to make whatever I want to use between them public? How about if I want to minimize global variables? What about the following: var PootyTang = function(){ someVar1 = $('#someid').text(); //some stuff }; and in another included file used by that same page I have: var TangyPoot = function(){ someVar1 = $('#someid').text(); //some completely different stuff }; What's the best way to share the value of someVar1 across these anonymous (they are wrapped as the first example) functions?

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• Is it possible, in ASP .net, to reference private assembly in a non-virtual subdirectory?

  - by Bago

  Is it possible to reference a private assembly in asp .net from a sub-folder that is not setup as a virtual directory? In other words, my page is setup in ~/subdir, I don't have access to ~/, and I am not an IIS admin. Can I reference a private assembly? How would I do this? I've tried <%@ Assembly Src="/subdir/bin/Assembly.dll % and <%@ Assembly Src="/subdir/bin/Assembly.dll % , but I get the messages "There is no build provider to match the extension .dll" or "Failed to map to path" respectively. Here is my folder structure: / | -subdir | | - Bin | | | *Assembly.dll | | *Default.aspx I've heard that in web.config might do the trick, but when I've tried it, it doesn't seem to work. Furthermore, I've read that only works in the application .config file. (i.e., the one in ~/). Anyhow, I already tried adding the following to web.config: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <probing privatePath="/subdir/bin" /> <dependentAssembly> <codeBase href="/subdir/bin/Assembly.dll"/> </dependentAssembly> </assemblyBinding> For more background on my problem, I am simply using a shared host, all I have is access to is that subdirectory, and I am trying to use fckeditor.

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• Is it possible, in ASP.net, to reference private assembly in a non-virtual subdirectory?

  - by Bago

  Is it possible to reference a private assembly in asp .net from a sub-folder that is not setup as a virtual directory? In other words, my page is setup in ~/subdir, I don't have access to ~/, and I am not an IIS admin. Can I reference a private assembly? How would I do this? I've tried <%@ Assembly Src="/subdir/bin/Assembly.dll % and <%@ Assembly Src="/subdir/bin/Assembly.dll % , but I get the messages "There is no build provider to match the extension .dll" or "Failed to map to path" respectively. Here is my folder structure: / | -subdir | | - Bin | | | *Assembly.dll | | *Default.aspx I've heard that in web.config might do the trick, but when I've tried it, it doesn't seem to work. Furthermore, I've read that only works in the application .config file. (i.e., the one in ~/). Anyhow, I already tried adding the following to web.config: <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <probing privatePath="/subdir/bin" /> <dependentAssembly> <codeBase href="/subdir/bin/Assembly.dll"/> </dependentAssembly> </assemblyBinding> For more background on my problem, I am simply using a shared host, all I have is access to is that subdirectory, and I am trying to use fckeditor.

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• jQuery plugin design pattern for using `this` in private methods?

  - by thebossman

  I'm creating jQuery plugins using the pattern from the Plugins Authoring page: (function($) { $.fn.myPlugin = function(settings) { var config = {'foo': 'bar'}; if (settings) $.extend(config, settings); this.each(function() { // element-specific code here }); return this; }; })(jQuery); My code calls for several private methods that manipulate this. I am calling these private methods using the apply(this, arguments) pattern. Is there a way of designing my plugin such that I don't have to call apply to pass this from method to method? My modified plugin code looks roughly like this: (function($) { $.fn.myPlugin = function(settings) { var config = {'foo': 'bar'}; if (settings) $.extend(config, settings); this.each(function() { method1.apply(this); }); return this; }; function method1() { // do stuff with $(this) method2.apply(this); } function method2() { // do stuff with $(this), etc... } })(jQuery);

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• Java Variable Initialization

  - by Samuel Brainard

  Here's a piece of code I wrote. public class cube { private int length; private int breadth; private int height; private int volume; private int density; private int weight; public cube(int l,int b,int h, int d) { length=l; breadth=b; height=h; density=d; } public void volmeShow(){ volume=length*breadth*height; System.out.println("The Volume of the cube is "+this.volume); So if I implement the above cube class like this, public class cubeApp { public static void main(String[] args){ cube mycube = new cube(5,6,9,2); mycube.volumeShow(); I get an output that tells me Volume is 270. But I get an output that says Volume is 0 if I define the volume variable like this: public class cube { private int length; private int breadth; private int height; private int volume=length*breadth*height; private int density; private int weight; public cube(int l,int b,int h, int d) { length=l; breadth=b; height=h; density=d; } public void volmeShow(){ System.out.println("The Volume of the cube is "+this.volume); Can somebody please explain why this is happening? Thanks, Samuel.

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• Installation error: INSTALL_FAILED_OLDER_SDK in eclipse

  - by user3014909

  I have an unexpe`ted problem with my Android project. I have a real android device with ice_cream sandwich installed. My app was working fine during the development but after I added a class to the project, I got an error: Installation error: INSTALL_FAILED_OLDER_SDK The problem is that everything is good in the manifest file. The minSdkversion is 8. Here is my manifest file: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="zabolotnii.pavel.timer" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18 " /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="zabolotnii.pavel.timer.TimerActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> I don't know, if there is any need to attach the new class ,but I didn't any changes to other code that should led to this error: package zabolotnii.pavel.timer; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.graphics.Paint; import android.graphics.Point; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.os.Environment; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.*; import android.widget.*; import java.io.File; import java.io.FilenameFilter; import java.util.*; public class OpenFileDialog extends AlertDialog.Builder { private String currentPath = Environment.getExternalStorageDirectory().getPath(); private List<File> files = new ArrayList<File>(); private TextView title; private ListView listView; private FilenameFilter filenameFilter; private int selectedIndex = -1; private OpenDialogListener listener; private Drawable folderIcon; private Drawable fileIcon; private String accessDeniedMessage; public interface OpenDialogListener { public void OnSelectedFile(String fileName); } private class FileAdapter extends ArrayAdapter<File> { public FileAdapter(Context context, List<File> files) { super(context, android.R.layout.simple_list_item_1, files); } @Override public View getView(int position, View convertView, ViewGroup parent) { TextView view = (TextView) super.getView(position, convertView, parent); File file = getItem(position); if (view != null) { view.setText(file.getName()); if (file.isDirectory()) { setDrawable(view, folderIcon); } else { setDrawable(view, fileIcon); if (selectedIndex == position) view.setBackgroundColor(getContext().getResources().getColor(android.R.color.holo_blue_dark)); else view.setBackgroundColor(getContext().getResources().getColor(android.R.color.transparent)); } } return view; } private void setDrawable(TextView view, Drawable drawable) { if (view != null) { if (drawable != null) { drawable.setBounds(0, 0, 60, 60); view.setCompoundDrawables(drawable, null, null, null); } else { view.setCompoundDrawables(null, null, null, null); } } } } public OpenFileDialog(Context context) { super(context); title = createTitle(context); changeTitle(); LinearLayout linearLayout = createMainLayout(context); linearLayout.addView(createBackItem(context)); listView = createListView(context); linearLayout.addView(listView); setCustomTitle(title) .setView(linearLayout) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { if (selectedIndex > -1 && listener != null) { listener.OnSelectedFile(listView.getItemAtPosition(selectedIndex).toString()); } } }) .setNegativeButton(android.R.string.cancel, null); } @Override public AlertDialog show() { files.addAll(getFiles(currentPath)); listView.setAdapter(new FileAdapter(getContext(), files)); return super.show(); } public OpenFileDialog setFilter(final String filter) { filenameFilter = new FilenameFilter() { @Override public boolean accept(File file, String fileName) { File tempFile = new File(String.format("%s/%s", file.getPath(), fileName)); if (tempFile.isFile()) return tempFile.getName().matches(filter); return true; } }; return this; } public OpenFileDialog setOpenDialogListener(OpenDialogListener listener) { this.listener = listener; return this; } public OpenFileDialog setFolderIcon(Drawable drawable) { this.folderIcon = drawable; return this; } public OpenFileDialog setFileIcon(Drawable drawable) { this.fileIcon = drawable; return this; } public OpenFileDialog setAccessDeniedMessage(String message) { this.accessDeniedMessage = message; return this; } private static Display getDefaultDisplay(Context context) { return ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); } private static Point getScreenSize(Context context) { Point screeSize = new Point(); getDefaultDisplay(context).getSize(screeSize); return screeSize; } private static int getLinearLayoutMinHeight(Context context) { return getScreenSize(context).y; } private LinearLayout createMainLayout(Context context) { LinearLayout linearLayout = new LinearLayout(context); linearLayout.setOrientation(LinearLayout.VERTICAL); linearLayout.setMinimumHeight(getLinearLayoutMinHeight(context)); return linearLayout; } private int getItemHeight(Context context) { TypedValue value = new TypedValue(); DisplayMetrics metrics = new DisplayMetrics(); context.getTheme().resolveAttribute(android.R.attr.listPreferredItemHeightSmall, value, true); getDefaultDisplay(context).getMetrics(metrics); return (int) TypedValue.complexToDimension(value.data, metrics); } private TextView createTextView(Context context, int style) { TextView textView = new TextView(context); textView.setTextAppearance(context, style); int itemHeight = getItemHeight(context); textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, itemHeight)); textView.setMinHeight(itemHeight); textView.setGravity(Gravity.CENTER_VERTICAL); textView.setPadding(15, 0, 0, 0); return textView; } private TextView createTitle(Context context) { TextView textView = createTextView(context, android.R.style.TextAppearance_DeviceDefault_DialogWindowTitle); return textView; } private TextView createBackItem(Context context) { TextView textView = createTextView(context, android.R.style.TextAppearance_DeviceDefault_Small); Drawable drawable = getContext().getResources().getDrawable(android.R.drawable.ic_menu_directions); drawable.setBounds(0, 0, 60, 60); textView.setCompoundDrawables(drawable, null, null, null); textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); textView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { File file = new File(currentPath); File parentDirectory = file.getParentFile(); if (parentDirectory != null) { currentPath = parentDirectory.getPath(); RebuildFiles(((FileAdapter) listView.getAdapter())); } } }); return textView; } public int getTextWidth(String text, Paint paint) { Rect bounds = new Rect(); paint.getTextBounds(text, 0, text.length(), bounds); return bounds.left + bounds.width() + 80; } private void changeTitle() { String titleText = currentPath; int screenWidth = getScreenSize(getContext()).x; int maxWidth = (int) (screenWidth * 0.99); if (getTextWidth(titleText, title.getPaint()) > maxWidth) { while (getTextWidth("..." + titleText, title.getPaint()) > maxWidth) { int start = titleText.indexOf("/", 2); if (start > 0) titleText = titleText.substring(start); else titleText = titleText.substring(2); } title.setText("..." + titleText); } else { title.setText(titleText); } } private List<File> getFiles(String directoryPath) { File directory = new File(directoryPath); List<File> fileList = Arrays.asList(directory.listFiles(filenameFilter)); Collections.sort(fileList, new Comparator<File>() { @Override public int compare(File file, File file2) { if (file.isDirectory() && file2.isFile()) return -1; else if (file.isFile() && file2.isDirectory()) return 1; else return file.getPath().compareTo(file2.getPath()); } }); return fileList; } private void RebuildFiles(ArrayAdapter<File> adapter) { try { List<File> fileList = getFiles(currentPath); files.clear(); selectedIndex = -1; files.addAll(fileList); adapter.notifyDataSetChanged(); changeTitle(); } catch (NullPointerException e) { String message = getContext().getResources().getString(android.R.string.unknownName); if (!accessDeniedMessage.equals("")) message = accessDeniedMessage; Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show(); } } private ListView createListView(Context context) { ListView listView = new ListView(context); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int index, long l) { final ArrayAdapter<File> adapter = (FileAdapter) adapterView.getAdapter(); File file = adapter.getItem(index); if (file.isDirectory()) { currentPath = file.getPath(); RebuildFiles(adapter); } else { if (index != selectedIndex) selectedIndex = index; else selectedIndex = -1; adapter.notifyDataSetChanged(); } } }); return listView; } }

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