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  • android thread management onPause

    - by Kwan Cheng
    I have a class that extends the Thread class and has its run method implemented as so. public void run(){ while(!terminate){ if(paused){ Thread.yield(); }else{ accummulator++; } } } This thread is spawned from the onCreate method. When my UI is hidden (when the Home key is pressed) my onPause method will set the paused flag to true and yield the tread. However in the DDMS I still see the uTime of the thread accumulate and its state as "running". So my question is. What is the proper way to stop the thread so that it does not use up CPU time?

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  • I'm new one in Android and HELP :)

    - by Kooper
    Hello everyone , I'd started for about a mouth and I have some problems now :( 1. I create a TabActivity and it has three Activity(tab1,tab2,tab3).I wanna realize that if I press a button in tab1,then TextView in tab2 can be changed. I've tried Intent and Bundle , but that didn't work and force close . Maybe because of the TabActivity I think . 2. If I have a layout and there are many TextView on it. But some are out of the screen. How can I scroll the screen? 3. Is it possible that TextView in Tablelayout can be clicked ? I've sreached there problems on Google for there days but still bother me . Really need help, Thanks :)

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  • Followed the official android documentations but still could not use SQLite in app

    - by user366539
    My DBHelper class public class DBHelper extends SQLiteOpenHelper { public DBHelper(Context context) { super(context,"SIMPLE_DB",null,1); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE SIMPLE_TABLE ( " + "ID INTEGER PRIMARY KEY " + "DESC TEXT);"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } } Activity class public class SimpleDatabase extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); DBHelper dbHelper = new DBHelper(this); SQLiteDatabase db = dbHelper.getReadableDatabase(); db.execSQL("INSERT INTO SIMPLE_TABLE VALUES (NULL, 'test');"); Cursor cursor = db.rawQuery("SELECT * FROM SIMPLE_TABLE", null); TextView text = (TextView)findViewById(R.id.textbox); text.setText(cursor.getString(0)); } } I figure it crashed (application has stopped unexpectedly!) at SQLiteDatabase db = ... because if I commented the code out from there to the end then it worked fine. But I have no idea whatsoever why it does that. Any help would be appreciated.

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  • Get company name in android using new API's

    - by HellBoy
    Currently I am getting company name using following code public class ContactsDemo extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Cursor cursor = getContentResolver().query(Contacts.Organizations.CONTENT_URI, null, null, null, null); //ContactsContract.CommonDataKinds. if(cursor!=null){ System.out.println(cursor.getString(cursor.getColumnIndex (Contacts.Organizations.COMPANY))); }}} but I don't want to use deprected API's. & in new API's there is no CONTENT_URI in Organisation class. How to get company name using new API.

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  • display several items in one row of a listview in android

    - by Sephy
    I don't now if this title is very clear, but I would like to understand how this is possible : And how we can have 2 elements on the same row of the listview, and handle different clicks, as the listview deals with handling the click on a child. Thanks for anyone who could point me in the right direction.

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  • (Android) Why won't invalidate() update my buttons immediately?

    - by frustrated user
    I have read several forums and examples on using invalidate() in order to update views immediately but I still do not understand why what I am doing will not work. The code below uses image buttons defined by "red", "blue", "green", and "yellow". I set a 1 second delay between each time I try and change a button's appearance. Please someone tell me what i'm doing wrong. private void showPattern() { if (correct == true) { for (int k = 0; k < temp_basket.length; k++) { if (temp_basket[k] == 0) { red.setPressed(true); red.invalidate(); final Handler handler = new Handler(); Timer t = new Timer(); t.schedule(new TimerTask() { public void run() { handler.post(new Runnable() { public void run() { red.setPressed(false); red.invalidate(); } }); } }, 1000); There are 3 more or these blocks after this one that are blue, green, and yellow.

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  • Android app crashes on second run

    - by Nick
    I have been working on my app and it runs on the simulator fine. I loaded it into my phone and now I have a problem. It runs fine when I first start it and also if I pick home and then restart it; however, if I use the back arrow and then restart it it crashes on that time, but will work out the next time I start it. I think it has to do with some kind of memory build up, but I verified onDestroy is being called, I figured that deletes everything my program created, right?

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  • capturing another activity's screen in android

    - by discoHR
    is it possible to have a service (A) which will launch an activity (B) and then periodically capture B's screen? also, is it possible to send onTouch events from A to B? basically, i'd like to make a bot which would use an application so i don't have to. i guess it's not possible but had to ask.

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  • Thread class closing from other Class (Activity) with protected void onStop() Android

    - by user1761337
    I have a Problem with Closing the Thread. I will Closing the Thread with onStop,onPause and onDestroy. This is my Source in the Activity Class: @Override protected void onStop(){ super.onStop(); finish(); } @Override protected void onPause() { super.onPause(); finish(); } @Override public void onDestroy() { this.mWakeLock.release(); super.onDestroy(); } And the Thread Class: public class GameThread extends Thread { private SurfaceHolder mSurfaceHolder; private Handler mHandler; private Context mContext; private Paint mLinePaint; private Paint blackPaint; //for consistent rendering private long sleepTime; //amount of time to sleep for (in milliseconds) private long delay=1000/30; //state of game (Running or Paused). int state = 1; public final static int RUNNING = 1; public final static int PAUSED = 2; public final static int STOPED = 3; GameSurface gEngine; public GameThread(SurfaceHolder surfaceHolder, Context context, Handler handler,GameSurface gEngineS){ //data about the screen mSurfaceHolder = surfaceHolder; mHandler = handler; mContext = context; gEngine=gEngineS; } //This is the most important part of the code. It is invoked when the call to start() is //made from the SurfaceView class. It loops continuously until the game is finished or //the application is suspended. private long beforeTime; @Override public void run() { //UPDATE while (state==RUNNING) { Log.d("State","Thread is runnig"); //time before update beforeTime = System.nanoTime(); //This is where we update the game engine gEngine.Update(); //DRAW Canvas c = null; try { //lock canvas so nothing else can use it c = mSurfaceHolder.lockCanvas(null); synchronized (mSurfaceHolder) { //clear the screen with the black painter. //reset the canvas c.drawColor(Color.BLACK); //This is where we draw the game engine. gEngine.doDraw(c); } } finally { // do this in a finally so that if an exception is thrown // during the above, we don't leave the Surface in an // inconsistent state if (c != null) { mSurfaceHolder.unlockCanvasAndPost(c); } } this.sleepTime = delay-((System.nanoTime()-beforeTime)/1000000L); try { //actual sleep code if(sleepTime>0){ this.sleep(sleepTime); } } catch (InterruptedException ex) { Logger.getLogger(GameThread.class.getName()).log(Level.SEVERE, null, ex); } while (state==PAUSED){ Log.d("State","Thread is pausing"); try { this.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }} How i can close the Thread from Activity Class??

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  • BroadCast Receiver calling intent after some time android

    - by khushi
    public class myReceiver extends BroadcastReceiver { public static boolean wasScreenOn = true; @Override public void onReceive(final Context context, Intent recievedIntent) { if (recievedIntent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { wasScreenOn = false; Intent intent = new Intent(context, myActivity.class); intent.setAction(Intent.ACTION_MAIN); intent.setFlags(Intent.FLAG_ACTIVITY_NO_USER_ACTION); intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY); intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); intent.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); context.startActivity(intent .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)); } else if (recievedIntent.getAction().equals(Intent.ACTION_SCREEN_ON)) { wasScreenOn = true; } } } The activity display after when action screen on is call.

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  • Installing a large size apk application on Android phone

    - by user348686
    I have an application which is of size 130MB. when i try to install its displaying insufficient memory error. but i have around 170MB left in available space in internal memory. How can i Install this app? The size of the app is large because it contains many media files. In Motorolla droid its getting installed. but on Nexus One its giving this error.

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  • Android - Turn off display without triggering sleep/lock screen - Turn on with Touchscreen

    - by NebulaSleuth
    I have been trying to find a way to turn off the display, and wake up from the user touching the touch screen. The device is in an embedded environment where the device is a tablet and the user does not have access to anything except the touch screen (no buttons at all). It is connected to power so the battery won't be a problem, but when I detect no activity I want to turn off the screen so it isn't staring them in the face all day and doesn't reduce the life the LCD backlight. I maintain a wakelock permanently and decide when to sleep myself. The problem is that when I turn off the screen using : WindowManager.LayoutParams params = getWindow().getAttributes(); params.screenBrightness = 0; getWindow().setAttributes(params); The activity gets paused and stopped. And the unit does not respond to a touch to wake it up. You need to press the power button. At that point the "slide to unlock" shows up. I want to turn off the display, and then stay running so I can detect a touch screen event and turn the display back on. I also tried turning the display to a brightness of 0.1, which works on some devices, but the device I need it to work on, only "dims" the display. I also tried this: // First Remove my FULL wakelock //then aquire a partial wake lock (which should turn off the display) PowerManager.WakeLock wl = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Your Tag"); wl.acquire(); however this method does not turn off the display.

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  • [Android] Putting Serializable Classes into SQL?

    - by CaseyB
    Here's the situation. I have a bunch of objects that implement Serializable that I want to store in a SQL database. I have two questions Is there a way to serialize the object directly into the database Is that the best way to do it or should I Write the object out to a formatting String and put it in the database that way and then parse it back out Write each member to the database with a field that is unique to each object

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  • Android application error

    - by Aswan
    Hi folks i developed application with map service and webservices when i run application its became very slow and continuosly it is showing activity not responding force close or wait how to resolve this issue Thanks in advance Aswan

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  • android: ending activity from tab

    - by Jin
    I have 3 classes, let's call them 1, 2, and 3. Class 1 extends TabActivity and organizes the whole tab thing, Class 2 and 3 are just two separate tabs each with some lines of text. I call Class 1 from another activity using startActivityForResult. I then added an optionsMenu in class 2, and when user clicks the optionMenu, the following code is carried out: @Override public boolean onMenuItemSelected(int featureId, MenuItem item) { Intent i = new Intent(); switch(item.getItemId()) { case Result.NEXT_ID: i.putExtra(Result.PAGE_REQUEST, NEXT); setResult(RESULT_OK, i); finish(); break; case Result.PREV_ID: i.putExtra(Result.PAGE_REQUEST, PREV); setResult(RESULT_OK, i); finish(); } return super.onMenuItemSelected(featureId, item); } In my parent class (the class that called 1 to begin with), in its onActivityResult function, I want to get the data from the extras. However, the intent is always null, and I can't figure out why. When I call finish() on class 2, is it calling some other function in class 1? Do I have to transfer the intent data somehow?

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  • Expression parser library for Android.

    - by Malx
    What is the best way to evaluate simple conditional statements like: "a>b" ? "x-4<10+y & y>x" ? Expressions are loaded from external file. Variables are set in application. Syntax used is not essential. It may be "&" or "and" or any other supported with language/library. I need to take different action depending on result of evaluation - is it true or false. Could I use any parser already included with Andorid? Is there some way to use JS "eval" from browser component? Is it possible to use sqlite expressions to get true/false result without selecting anything? Those libraries are implemented in native code. Will it be faster and less battery expensive?

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  • Displaying conditional amount of fields in UI (Android)

    - by Sochin
    I am using layout xml documents for my ui controls. I need to create and remove these controls (input fields) on the fly, based on how many results I get back from my database. For each group, there can be 0..* fields and these are prepopulated from the database. Also, it would be good if I can invoke a method to create an additional field; something like the address book, where you can click + or - to add or remove a phone or other detail. In a "psuedo" style, I'm guessing something like this: Check database - How many of X are there [y]? Create Y fields. The user may then add new fields, so once I click submit i need to apply all of that to database. Any examples or hints greatly welcomed. Hope this make sense! :)

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