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• Proguard and two projects using the same android library. broadcasting. ClassNotFoundException

  - by trololo

  The problem:I have got 2 apps. The interact with each other via broadcasting. I have parcelable class in the android library (they send content of class in the library). So after using Proguard I have got ClassNotFondException. How to solve it? 07-03 02:13:51.832: E/AndroidRuntime(6801): FATAL EXCEPTION: main 07-03 02:13:51.832: E/AndroidRuntime(6801): java.lang.RuntimeException: Unable to start receiver <appname>.<name>.ar.free.BRMain: java.lang.RuntimeException: Parcelable encounteredClassNotFoundException reading a Serializable object (name = <appname>.a.a.b) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2277) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.app.ActivityThread.access$1500(ActivityThread.java:140) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Handler.dispatchMessage(Handler.java:99) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Looper.loop(Looper.java:137) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.app.ActivityThread.main(ActivityThread.java:4898) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.reflect.Method.invokeNative(Native Method) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.reflect.Method.invoke(Method.java:511) 07-03 02:13:51.832: E/AndroidRuntime(6801): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 07-03 02:13:51.832: E/AndroidRuntime(6801): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 07-03 02:13:51.832: E/AndroidRuntime(6801): at dalvik.system.NativeStart.main(Native Method) 07-03 02:13:51.832: E/AndroidRuntime(6801): Caused by: java.lang.RuntimeException: Parcelable encounteredClassNotFoundException reading a Serializable object (name = <appname>.a.a.b) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Parcel.readSerializable(Parcel.java:2148) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Parcel.readValue(Parcel.java:2016) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Parcel.readMapInternal(Parcel.java:2226) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Bundle.unparcel(Bundle.java:223) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Bundle.getInt(Bundle.java:922) 07-03 02:13:51.832: E/AndroidRuntime(6801): at <appname>.<name>.ar.free.BRMain.onReceive(BRMain.java:35) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2270) 07-03 02:13:51.832: E/AndroidRuntime(6801): ... 10 more 07-03 02:13:51.832: E/AndroidRuntime(6801): Caused by: java.lang.ClassNotFoundException: <appname>.a.a.b 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.Class.classForName(Native Method) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.Class.forName(Class.java:217) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:2301) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1660) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:683) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readNewObject(ObjectInputStream.java:1803) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readNonPrimitiveContent(ObjectInputStream.java:787) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:2003) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.io.ObjectInputStream.readObject(ObjectInputStream.java:1960) 07-03 02:13:51.832: E/AndroidRuntime(6801): at android.os.Parcel.readSerializable(Parcel.java:2142) 07-03 02:13:51.832: E/AndroidRuntime(6801): ... 16 more 07-03 02:13:51.832: E/AndroidRuntime(6801): Caused by: java.lang.NoClassDefFoundError: <appname>/a/a/b 07-03 02:13:51.832: E/AndroidRuntime(6801): ... 26 more 07-03 02:13:51.832: E/AndroidRuntime(6801): Caused by: java.lang.ClassNotFoundException: <appname>.a.a.b 07-03 02:13:51.832: E/AndroidRuntime(6801): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 07-03 02:13:51.832: E/AndroidRuntime(6801): at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 07-03 02:13:51.832: E/AndroidRuntime(6801): ... 26 more

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• Communicating between C# application and Android app via bluetooth

  - by Akki

  The android application acts as a server in this case. I have a main activity which creates a Thread to handle serverSocket and a different thread to handle the socket connection. I am using a uuid common to C# and android. I am using 32feet bluetooth library for C#. The errors i am facing are 1) My logcat shows this debug log Error while doing socket.connect()1 java.io.IOException: File descriptor in bad state Message: File descriptor in bad state Localized Message: File descriptor in bad state Received : Testing Connection Count of Thread is : 1 2) When i try to send something via C# app the second time, this exception is thrown: A first chance exception of type 'System.InvalidOperationException' occurred in System.dll System.InvalidOperationException: BeginConnect cannot be called while another asynchronous operation is in progress on the same Socket. at System.Net.Sockets.Socket.DoBeginConnect(EndPoint endPointSnapshot, SocketAddress socketAddress, LazyAsyncResult asyncResult) at System.Net.Sockets.Socket.BeginConnect(EndPoint remoteEP, AsyncCallback callback, Object state) at InTheHand.Net.Bluetooth.Msft.SocketBluetoothClient.BeginConnect(BluetoothEndPoint remoteEP, AsyncCallback requestCallback, Object state) at InTheHand.Net.Sockets.BluetoothClient.BeginConnect(BluetoothEndPoint remoteEP, AsyncCallback requestCallback, Object state) at InTheHand.Net.Sockets.BluetoothClient.BeginConnect(BluetoothAddress address, Guid service, AsyncCallback requestCallback, Object state) at BTSyncClient.Form1.connect() in c:\users\----\documents\visual studio 2010\Projects\TestClient\TestClient\Form1.cs:line 154 I only know android application programming and i designed the C# by learning bit and pieces. FYI, My android phone is galaxy s with ICS running on it.Please point out my mistakes.. Source codes : C# Code using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; using System.Net.Sockets; using InTheHand.Net.Bluetooth; using InTheHand.Windows.Forms; using InTheHand.Net.Sockets; using InTheHand.Net; namespace BTSyncClient { public partial class Form1 : Form { BluetoothClient myself; BluetoothDeviceInfo bTServerDevice; private Guid uuid = Guid.Parse("00001101-0000-1000-8000-00805F9B34FB"); bool isConnected; public Form1() { InitializeComponent(); if (BluetoothRadio.IsSupported) { myself = new BluetoothClient(); } } private void Form1_Load(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { connect(); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { try { myself.GetStream().Close(); myself.Dispose(); } catch (Exception ex) { Console.Out.WriteLine(ex); } } private void button2_Click(object sender, EventArgs e) { SelectBluetoothDeviceDialog dialog = new SelectBluetoothDeviceDialog(); DialogResult result = dialog.ShowDialog(this); if(result.Equals(DialogResult.OK)){ bTServerDevice = dialog.SelectedDevice; } } private void callback(IAsyncResult ar) { String msg = (String)ar.AsyncState; if (ar.IsCompleted) { isConnected = myself.Connected; if (myself.Connected) { UTF8Encoding encoder = new UTF8Encoding(); NetworkStream stream = myself.GetStream(); if (!stream.CanWrite) { MessageBox.Show("Stream is not Writable"); } System.IO.StreamWriter mywriter = new System.IO.StreamWriter(stream, Encoding.UTF8); mywriter.WriteLine(msg); mywriter.Flush(); } else MessageBox.Show("Damn thing isnt connected"); } } private void connect() { try { if (bTServerDevice != null) { myself.BeginConnect(bTServerDevice.DeviceAddress, uuid, new AsyncCallback(callback) , message.Text); } } catch (Exception e) { Console.Out.WriteLine(e); } } } } Server Thread import java.io.IOException; import java.util.UUID; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothServerSocket; import android.bluetooth.BluetoothSocket; import android.util.Log; public class ServerSocketThread extends Thread { private static final String TAG = "TestApp"; private BluetoothAdapter btAdapter; private BluetoothServerSocket serverSocket; private boolean stopMe; private static final UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //private static final UUID uuid = UUID.fromString("6e58c9d5-b0b6-4009-ad9b-fd9481aef9b3"); private static final String SERVICE_NAME = "TestService"; public ServerSocketThread() { stopMe = false; btAdapter = BluetoothAdapter.getDefaultAdapter(); try { serverSocket = btAdapter.listenUsingRfcommWithServiceRecord(SERVICE_NAME, uuid); } catch (IOException e) { Log.d(TAG,e.toString()); } } public void signalStop(){ stopMe = true; } public void run(){ Log.d(TAG,"In ServerThread"); BluetoothSocket socket = null; while(!stopMe){ try { socket = serverSocket.accept(); } catch (IOException e) { break; } if(socket != null){ AcceptThread newClientConnection = new AcceptThread(socket); newClientConnection.start(); } } Log.d(TAG,"Server Thread now dead"); } // Will cancel the listening socket and cause the thread to finish public void cancel(){ try { serverSocket.close(); } catch (IOException e) { } } } Accept Thread import java.io.IOException; import java.io.InputStream; import java.util.Scanner; import android.bluetooth.BluetoothSocket; import android.util.Log; public class AcceptThread extends Thread { private BluetoothSocket socket; private String TAG = "TestApp"; static int count = 0; public AcceptThread(BluetoothSocket Socket) { socket = Socket; } volatile boolean isError; String output; String error; public void run() { Log.d(TAG, "AcceptThread Started"); isError = false; try { socket.connect(); } catch (IOException e) { Log.d(TAG,"Error while doing socket.connect()"+ ++count); Log.d(TAG, e.toString()); Log.d(TAG,"Message: "+e.getLocalizedMessage()); Log.d(TAG,"Localized Message: "+e.getMessage()); isError = true; } InputStream in = null; try { in = socket.getInputStream(); } catch (IOException e) { Log.d(TAG,"Error while doing socket.getInputStream()"); Log.d(TAG, e.toString()); Log.d(TAG,"Message: "+e.getLocalizedMessage()); Log.d(TAG,"Localized Message: "+e.getMessage()); isError = true; } Scanner istream = new Scanner(in); if (istream.hasNextLine()) { Log.d(TAG, "Received : "+istream.nextLine()); Log.d(TAG,"Count of Thread is : " + count); } istream.close(); try { in.close(); } catch (IOException e) { Log.d(TAG,"Error while doing in.close()"); Log.d(TAG, e.toString()); Log.d(TAG,"Message: "+e.getLocalizedMessage()); Log.d(TAG,"Localized Message: "+e.getMessage()); isError = true; } try { socket.close(); } catch (IOException e) { Log.d(TAG,"Error while doing socket.close()"); Log.d(TAG, e.toString()); Log.d(TAG,"Message: "+e.getLocalizedMessage()); Log.d(TAG,"Localized Message: "+e.getMessage()); isError = true; } } }

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• PulpCore music playback - loop sound and animate volume

  - by Peter Perhác

  I have been experimenting with PulpCore, trying to create my own tower defence game (not-playable yet), and I am enjoying it very much I ran into a problem that I can't quite figure out. I extended PulpCore with the JOrbis thing to allow OGG files to be played. Works fine. However, pulpCore seems to have a problem with looping the sound WHILE animating the volume level. I tried this with wav file too, to make sure it isn't jOrbis that breaks it. The code is like this: Sound bgMusic = Sound.load("music/music.ogg"); Playback musicPlayback; ... musicVolume = new Fixed(0.75); musicPlayback = bgMusic.loop(musicVolume); //TODO figure out why it's NOT looping when volume is animated // musicVolume.animate(0, musicVolume.get(), FADE_IN_TIME); This code, for as long as the last line is commented out, plays the music.ogg again and again in an endless loop (which I can stop by calling stop on the Playback object returned from loop(). However, I would like the music to fade in smoothly, so following the advice of the PulpCore API docs, I added the last line which will create the fade-in but the music will only play once and then stop. I wonder why is that? Here is a bit of the documentation: Playback pulpcore.sound.Sound.loop(Fixed level) Loops this sound clip with the specified volume level (0.0 to 1.0). The level may have a property animation attached. Parameters: level Returns: a Playback object for this unique sound playback (one Sound can have many simultaneous Playback objects) or null if the sound could not be played. So what could be the problem? I repeat, with the last line, the sound fades in but doesn't loop, without it it loops but starts with the specified 0.75 volume level. Why can't I animate the volume of the looped music playback? What am I doing wrong? Anyone has any experience with pulpCore and has come across this problem? Anyone could please download PulpCore and try to loop music which fades-in (out)? note: I need to keep a reference to the Playback object returned so I can kill music later.

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• Android: restful API service

  - by Martyn

  Hey, I'm looking to make a service which I can use to make calls to a web based rest api. I've spent a couple of days looking through stackoverflow.com, reading books and looking at articles whilst playing about with some code and I can't get anything which I'm happy with. Basically I want to start a service on app init then I want to be able to ask that service to request a url and return the results. In the meantime I want to be able to display a progress window or something similar. I've created a service currently which uses IDL, I've read somewhere that you only really need this for cross app communication, so think these needs stripping out but unsure how to do callbacks without it. Also when I hit the post(Config.getURL("login"), values) the app seems to pause for a while (seems weird - thought the idea behind a service was that it runs on a different thread!) Currently I have a service with post and get http methods inside, a couple of AIDL files (for two way communication), a ServiceManager which deals with starting, stopping, binding etc to the service and I'm dynamically creating a Handler with specific code for the callbacks as needed. I don't want anyone to give me a complete code base to work on, but some pointers would be greatly appreciated; even if it's to say I'm doing it completely wrong. I'm pretty new to Android and Java dev so if there are any blindingly obvious mistakes here - please don't think I'm a rubbish developer, I'm just wet behind the ears and would appreciate being told exactly where I'm going wrong. Anyway, code in (mostly) full (really didn't want to put this much code here, but I don't know where I'm going wrong - apologies in advance): public class RestfulAPIService extends Service { final RemoteCallbackList<IRemoteServiceCallback> mCallbacks = new RemoteCallbackList<IRemoteServiceCallback>(); public void onStart(Intent intent, int startId) { super.onStart(intent, startId); } public IBinder onBind(Intent intent) { return binder; } public void onCreate() { super.onCreate(); } public void onDestroy() { super.onDestroy(); mCallbacks.kill(); } private final IRestfulService.Stub binder = new IRestfulService.Stub() { public void doLogin(String username, String password) { Message msg = new Message(); Bundle data = new Bundle(); HashMap<String, String> values = new HashMap<String, String>(); values.put("username", username); values.put("password", password); String result = post(Config.getURL("login"), values); data.putString("response", result); msg.setData(data); msg.what = Config.ACTION_LOGIN; mHandler.sendMessage(msg); } public void registerCallback(IRemoteServiceCallback cb) { if (cb != null) mCallbacks.register(cb); } }; private final Handler mHandler = new Handler() { public void handleMessage(Message msg) { // Broadcast to all clients the new value. final int N = mCallbacks.beginBroadcast(); for (int i = 0; i < N; i++) { try { switch (msg.what) { case Config.ACTION_LOGIN: mCallbacks.getBroadcastItem(i).userLogIn( msg.getData().getString("response")); break; default: super.handleMessage(msg); return; } } catch (RemoteException e) { } } mCallbacks.finishBroadcast(); } public String post(String url, HashMap<String, String> namePairs) {...} public String get(String url) {...} }; A couple of AIDL files: package com.something.android oneway interface IRemoteServiceCallback { void userLogIn(String result); } and package com.something.android import com.something.android.IRemoteServiceCallback; interface IRestfulService { void doLogin(in String username, in String password); void registerCallback(IRemoteServiceCallback cb); } and the service manager: public class ServiceManager { final RemoteCallbackList<IRemoteServiceCallback> mCallbacks = new RemoteCallbackList<IRemoteServiceCallback>(); public IRestfulService restfulService; private RestfulServiceConnection conn; private boolean started = false; private Context context; public ServiceManager(Context context) { this.context = context; } public void startService() { if (started) { Toast.makeText(context, "Service already started", Toast.LENGTH_SHORT).show(); } else { Intent i = new Intent(); i.setClassName("com.something.android", "com.something.android.RestfulAPIService"); context.startService(i); started = true; } } public void stopService() { if (!started) { Toast.makeText(context, "Service not yet started", Toast.LENGTH_SHORT).show(); } else { Intent i = new Intent(); i.setClassName("com.something.android", "com.something.android.RestfulAPIService"); context.stopService(i); started = false; } } public void bindService() { if (conn == null) { conn = new RestfulServiceConnection(); Intent i = new Intent(); i.setClassName("com.something.android", "com.something.android.RestfulAPIService"); context.bindService(i, conn, Context.BIND_AUTO_CREATE); } else { Toast.makeText(context, "Cannot bind - service already bound", Toast.LENGTH_SHORT).show(); } } protected void destroy() { releaseService(); } private void releaseService() { if (conn != null) { context.unbindService(conn); conn = null; Log.d(LOG_TAG, "unbindService()"); } else { Toast.makeText(context, "Cannot unbind - service not bound", Toast.LENGTH_SHORT).show(); } } class RestfulServiceConnection implements ServiceConnection { public void onServiceConnected(ComponentName className, IBinder boundService) { restfulService = IRestfulService.Stub.asInterface((IBinder) boundService); try { restfulService.registerCallback(mCallback); } catch (RemoteException e) {} } public void onServiceDisconnected(ComponentName className) { restfulService = null; } }; private IRemoteServiceCallback mCallback = new IRemoteServiceCallback.Stub() { public void userLogIn(String result) throws RemoteException { mHandler.sendMessage(mHandler.obtainMessage(Config.ACTION_LOGIN, result)); } }; private Handler mHandler; public void setHandler(Handler handler) { mHandler = handler; } } Service init and bind: // this I'm calling on app onCreate servicemanager = new ServiceManager(this); servicemanager.startService(); servicemanager.bindService(); application = (ApplicationState)this.getApplication(); application.setServiceManager(servicemanager); service function call: // this lot i'm calling as required - in this example for login progressDialog = new ProgressDialog(Login.this); progressDialog.setMessage("Logging you in..."); progressDialog.show(); application = (ApplicationState) getApplication(); servicemanager = application.getServiceManager(); servicemanager.setHandler(mHandler); try { servicemanager.restfulService.doLogin(args[0], args[1]); } catch (RemoteException e) { e.printStackTrace(); } ...later in the same file... Handler mHandler = new Handler() { public void handleMessage(Message msg) { switch (msg.what) { case Config.ACTION_LOGIN: if (progressDialog.isShowing()) { progressDialog.dismiss(); } try { ...process login results... } } catch (JSONException e) { Log.e("JSON", "There was an error parsing the JSON", e); } break; default: super.handleMessage(msg); } } }; Any and all help is greatly appreciated and I'll even buy you a coffee or a beer if you fancy :D Martyn

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• Using the Android SDK on a Mac, Eclipse is really slow. How can I speed it up?

  - by morais

  I'm using Eclipse + the Android SDK on a Mac running Snow Leopard to develop Android apps. Thing is, Eclipse is really slow - like, it "beach balls" for a few seconds when changing tabs. Is there anything I can do to improve it's performance?

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• TabHost / TabWidget - Scale Background Image ?

  - by user359519

  I need to scale my TabWidget background images so they maintain aspect ratio. I am using a TabHost with a TabWidget. I am then using setBackgroundDrawable to set the images. I found a close answer here - Background in tab widget ignore scaling. However, I'm not sure just where to add the new Drawable code. (Working with the HelloTabWidget example, none of my modules use RelativeLayout, and I don't see any layout for "tabcontent".) I also found this thread - Android: Scale a Drawable or background image?. According to it, it sounds like I would have to pre-scale my images, which defeats the whole purpose of making them scaleable. I also found another thread where someone subclassed the Drawable class so it would either not scale, or it would scale properly. I can't find it now, but that seems like a LOT to go through when you should just be able to do something simple like mTab.setScaleType(centerInside). Here's my code: main.xml: <?xml version="1.0" encoding="utf-8"?> <TabHost xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/main_background"> <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1"/> <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="0"/> </LinearLayout> </TabHost> main activity: tabHost.setOnTabChangedListener(new OnTabChangeListener() { TabHost changedTabHost = getTabHost(); TabWidget changedTabWidget = getTabWidget(); View changedView = changedTabHost.getTabWidget().getChildAt(0); public void onTabChanged(String tabId) { int selectedTab = changedTabHost.getCurrentTab(); TabWidget tw = getTabWidget(); if(selectedTab == 0) { //setTitle("Missions Timeline"); View tempView = tabHost.getTabWidget().getChildAt(0); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_timeline_on)); tempView = tabHost.getTabWidget().getChildAt(1); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_map_off)); tempView = tabHost.getTabWidget().getChildAt(2); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_search_off)); tempView = tabHost.getTabWidget().getChildAt(3); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_news_off)); tempView = tabHost.getTabWidget().getChildAt(4); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_license_off)); //ImageView iv = (ImageView)tabHost.getTabWidget().getChildAt(0).findViewById(android.R.id.icon); //iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_timeline_on)); //iv = (ImageView)tabHost.getTabWidget().getChildAt(1).findViewById(android.R.id.icon); //iv.setImageDrawable(getResources().getDrawable(R.drawable.tab_map_off)); } else if (selectedTab == 1) { //setTitle("Spinoffs Around You"); View tempView = tabHost.getTabWidget().getChildAt(0); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_timeline_off)); tempView = tabHost.getTabWidget().getChildAt(1); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_map_on)); tempView = tabHost.getTabWidget().getChildAt(2); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_search_off)); tempView = tabHost.getTabWidget().getChildAt(3); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_news_off)); tempView = tabHost.getTabWidget().getChildAt(4); tempView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tab_license_off)); } I also tried 9patch images, but they wind up being too small. So, what's the best way to go about this?

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• Javascript API not working for Chrome or Safari on JW Player 5.9

  - by Lando

  I am working on a custom interface for the JW Player which displays the current track title and has play/pause, next track, previous track and volume toggle buttons. It works for IE8/9 and FF but fails for Chrome and Safari. Chrome's console gives the following error: Uncaught TypeError: Object # has no method 'addControllerListener' This is the code I am using for testing. <div id="container">Loading the player ...</div> <script type="text/javascript"> jwplayer("container").setup({ image: "preview.jpg", height: 320, width: 480, modes: [ { type: "html5" }, { type: "flash", src: "player.swf" } ], 'playlist': [ { 'file': "audio/01.mp3", 'title': "Track 1" }, { 'file': "audio/02.mp3", 'title': "Track 2" }, { 'file': "audio/03.mp3", 'title': "Track 3" } ], }); function playerReady(obj) { player = document.getElementById(obj.id); displayFirstItem(); }; function displayFirstItem() { try { playlist = player.getPlaylist(); } catch(e) { setTimeout("displayFirstItem()", 100); } player.addControllerListener('ITEM', 'itemMonitor'); itemMonitor({index:0}); }; function itemMonitor(obj) { $('#nowplaying').html('<span><strong>Now Playing:</strong> ' + playlist[obj.index]['title'] + '</span>'); }; </script> <div id="nowplaying"></div> <div class="control_bar"> <ul> <li onclick='player.sendEvent("play");'>[ &#8250; ] Play / Pause</li> <li onclick='player.sendEvent("prev");'>[ &laquo; ] Previous item</li> <li onclick='player.sendEvent("next");'>[ &raquo; ] Next item</li> </ul> </div> I have searched and tried several modifications, like adding the javascriptid parameter, nothing seems to work for Chrome or Safari. Any ideas? Thanks

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• On Android, click to expand list -and- click on a button?

  - by Aurora

  I have just started my career as an android programmer, and am currently relying heavily on the sample code and api examples. I have been working with this api example, to produce an expandable list of items (note this example does not use the ExpadableListView). In playing with the example, I tried to add another widget that would become visible and be gone at the same time as the text (mDialogue in the sample code). This works well with another TextView, but as soon as I tried to add a button widget, it stopped working. The list would expand on first click, showing my hidden TextView and Button, but it will not disappear on further clicks. The button is however, clickable, and I was able to set up an onClick listener to change the button text back and forth. I'm starting to wonder, is it just not possible to have a clickable item inside a clickable list item? Or is there some kind of work around? Would it solve my problem if I used ExpandableListView?

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• Mobile Connections in Las Vegas April 17-21

  - by Wallym

  I'll be speaking at Mobile Connections in Las Vegas.  The event is April 17-21.  The event is a cross platform mobile event.  There will be sessions on iOS, Android, WP7, Blackberry, and cross platform tools.  The sessions I am speaking on are:Introduction to Android via MonoDroid:This session will introduce writing native applications geared for the Android Platform based on .NET/C#/Mono. We’ll examine the overall architecture of MonoDroid, discuss how it integrates with Visual Studio, debug with MonoDroid, and look at a couple of example apps written with MonoDroid. This session is targeted to the .NET developer who wants to move to the Android mobile platform. While the session will be introductory for the Android platform, it will be intermediate/expert for those on the .NET platform.Web Development with HTML5 to target Android, iOS, iPadThis session will examine the features of the mobile browser, and how developers can leverage it to build applications that target mobile devices. This session is for developers looking to target Android, iPhone, WebKit based devices, and other devices through the mobile web with the same application code, development managers looking to Android, iPhone, WebKit based devices, and other devices through the mobile web with the same application code, and developers and development managers looking to build mobile web apps for devices that look like native apps. Attendees will be able to immediately begin building web applications that target the Android and iPhone platforms. The benefits of this approach are: Easy cross platform development No requirement to learn Objective-C/Xcode or Java/Eclipse Applications are immediately upgradeable. There is no requirement to go through the Marketplace or Appstore of either platform. Web developers are easier to find than Objective-C, Blackberry, WebOS, or Java programmerYou can register for the event and get $100 off via this link.

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• Effective way to check if an Entity/Player enters a region/trigger

  - by Chris

  I was wondering how multiplayer games detect if you enter a special region. Let's assume there is a huge map that is so big that simply checking it would become a huge performance issue. I've seen bukkit (a modding API for Minecraft servers) firing an Event on every single move. I don't think that larger games do the same because even if you have only a few coordinates you are interested in, you have to loop through a few trigger zone to see if the player is inside your region - for every player. This seems like an extremely CPU-intense operation to me even though I've never developed something like that. Is there a special algorithm that is used by larger games to accomplish this? The only thing I could imagine is to split up the world into multiple parts and to register the event not on the movement itself but on all the parts that are covered by your area and only check for areas that are registered in the current part. And another thing I would like to know: How could you detect when someone must have entered a trigger but you never saw him directly in it since his client only sent you an move packet shortly before entering and after leaving the trigger area. Drawing a line and calculate all colliding parts seems rather CPU intensive if you have to perform it every time.

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• Making element draggable with Android WebView (ideally, just with Javascript) ?

  - by GJTorikian

  I'm building an app with a build target of 1.5 . I have a variable, WebView browser, that is calling loadUrl to load a static HTML page from my assets folder. In that HTML page, the following JavaScript is defined: var supportsTouch = ('createTouch' in document); ... var w = $('wrapper'); w[supportsTouch ? 'touchmove' : 'onmousemove'] = move; w[supportsTouch ? 'touchend' : 'onmouseup'] = function(event){ dragging = false; }; where move is another function that handles the dragging. Unfortunately, this doesn't seem to work. I cannot figure out a concise list of which touch events are available to Android--is it ontouchmove, or touchmove? Am I supposed to set up an onTouchEvent call back in my Java code, which then launches the JavaScript function?

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• Sending the files (At least 11 files) from folder through web service to android app.

  - by Shashank_Itmaster

  Hello All, I stuck in middle of this situation,Please help me out. My question is that I want to send files (Total 11 PDF Files) to android app using web service. I tried it with below code.Main Class from which web service is created public class MultipleFilesImpl implements MultipleFiles { public FileData[] sendPDFs() { FileData fileData = null; // List<FileData> filesDetails = new ArrayList<FileData>(); File fileFolder = new File( "C:/eclipse/workspace/AIPWebService/src/pdfs/"); // File fileTwo = new File( // "C:/eclipse/workspace/AIPWebService/src/simple.pdf"); File sendFiles[] = fileFolder.listFiles(); // sendFiles[0] = fileOne; // sendFiles[1] = fileTwo; DataHandler handler = null; char[] readLine = null; byte[] data = null; int offset = 0; int numRead = 0; InputStream stream = null; FileOutputStream outputStream = null; FileData[] filesData = null; try { System.out.println("Web Service Called Successfully"); for (int i = 0; i < sendFiles.length; i++) { handler = new DataHandler(new FileDataSource(sendFiles[i])); fileData = new FileData(); data = new byte[(int) sendFiles[i].length()]; stream = handler.getInputStream(); while (offset < data.length && (numRead = stream.read(data, offset, data.length - offset)) >= 0) { offset += numRead; } readLine = Base64Coder.encode(data); offset = 0; numRead = 0; System.out.println("'Reading File............................"); System.out.println("\n"); System.out.println(readLine); System.out.println("Data Reading Successful"); fileData.setFileName(sendFiles[i].getName()); fileData.setFileData(String.valueOf(readLine)); readLine = null; System.out.println("Data from bean " + fileData.getFileData()); outputStream = new FileOutputStream("D:/" + sendFiles[i].getName()); outputStream.write(Base64Coder.decode(fileData.getFileData())); outputStream.flush(); outputStream.close(); stream.close(); // FileData fileDetails = new FileData(); // fileDetails = fileData; // filesDetails.add(fileData); filesData = new FileData[(int) sendFiles[i].length()]; } // return fileData; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return filesData; } } Also The Interface MultipleFiles:- public interface MultipleFiles extends Remote { public FileData[] sendPDFs() throws FileNotFoundException, IOException, Exception; } Here I am sending an array of bean "File Data",having properties viz. FileData & FileName. FileData- contains file data in encoded. FileName- encoded file name. The Bean:- (FileData) public class FileData { private String fileName; private String fileData; public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } public String getFileData() { return fileData; } public void setFileData(String string) { this.fileData = string; } } The android DDMS gives out of memory exception when tried below code & when i tried to send two files then only first file is created. public class PDFActivity extends Activity { private final String METHOD_NAME = "sendPDFs"; private final String NAMESPACE = "http://webservice.uks.com/"; private final String SOAP_ACTION = NAMESPACE + METHOD_NAME; private final String URL = "http://192.168.1.123:8080/AIPWebService/services/MultipleFilesImpl"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView textViewOne = (TextView) findViewById(R.id.textViewOne); try { SoapObject soapObject = new SoapObject(NAMESPACE, METHOD_NAME); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope( SoapEnvelope.VER11); envelope.setOutputSoapObject(soapObject); textViewOne.setText("Web Service Started"); AndroidHttpTransport httpTransport = new AndroidHttpTransport(URL); httpTransport.call(SOAP_ACTION, envelope); // SoapObject result = (SoapObject) envelope.getResponse(); Object result = envelope.getResponse(); Log.i("Result", result.toString()); // String fileName = result.getProperty("fileName").toString(); // String fileData = result.getProperty("fileData").toString(); // Log.i("File Name", fileName); // Log.i("File Data", fileData); // File pdfFile = new File(fileName); // FileOutputStream outputStream = // openFileOutput(pdfFile.toString(), // MODE_PRIVATE); // outputStream.write(Base64Coder.decode(fileData)); Log.i("File", "File Created"); // textViewTwo.setText(result); // Object result = envelope.getResponse(); // FileOutputStream outputStream = openFileOutput(name, mode) } catch (Exception e) { e.printStackTrace(); } } } Please help with some explanation or changes in my code. Thanks in Advance.

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• Good way to cache data during Android application lifecycle?

  - by sniurkst

  Hello, keeping my question short, I have creating application with 3 activities, where A - list of categories, B - list of items, C - single item. Data displayed in B and C is parsed from online XML. But, if I go trough A - B1 - C, then back to A and then back to B1 I would like to have it's data cached somewhere so I wouldn't have to request XML again. I'm new to Android and Java programming, I've googled a lot and still can't find (or simply do not have an idea where to look) a way to do what I want. Would storing all received data in main activity A (HashMaps? ContentProviders?) and then passing to B and C (if they get same request that was before) be a good idea?

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• How to disable all hardware keys programatically in android?

  - by Raghu Rami Reddy

  I am developing android application with lock functionality. please suggest me how to disable all the hard keys programatically. here i am using beleow code to disable back button. i want like this functionality for all hard keys like home,search,camera, shortcut keys here is my code: @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_SEARCH) { Log.d("KeyPress", "search"); return true; } return false; } Thanks in advance.

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• Fast way to perform addition of 2 LARGE float arrays in Android. Optional JNI or Opengl ES

  - by nathan

  I simply need to add floatArray1 to floatArray2 storing the result in floatArray2.. no third array.. all arrays are one dimensional but are very large... probibly as large as the os will let me get away with. Max i would need is two float arrays with 40,000 floats each... but i could get away with 1/10th that i suppose minimum. Would love to do this in 1/30th or 1/60th of a second but that does not seem possible? Also if the code is JNI,NDK or OpenGL ES thats fine.. does android have an assembly language or like machine code i could use somehow?

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• Is it possible to start an activity in a different apk using startActivity on Android using the acti

  - by icecream

  I have tried to write an Android application with an activity that should be launched from a different application. It is not a content provider, just an app with a gui that should not be listed among the installed applications. I have tried the code examples here and it seems to be quite easy to launch existing providers and so on, but I fail to figure out how to just write a "hidden" app and launch it from a different one. The basic use case is: App A is a normal apk launchable from the application list. App B is a different apk with known package and activity names, but is is not visible or launchable from the application list. App A launches app B using the package and class names (or perhaps a URI constructed from these?). I fail in the third step. Is it possible to do this?

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• how to call 2 webmethods from a single webservice in a single activity in android?

  - by Jassi

  hello, I am new in android. i am able to called single webmethod from a .net webservice. i am usuing ksoap2 to implement soap. But in my .net webservice there are many web methods. I want to call more than one web methods. So please give some idea on this matter. Even i have tried by taking 2 soap_action and 2 method_name with single namespace then it works in first request but in 2nd request it gives xmlpullparserException error. thanx in advance,

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• Ways to optimize Android App code based on function call stack?

  - by K-RAN

  I've been told that Android OS stores all function calls in a stack. This can lead to many problems and cause the 'hiccups' during runtime, even if a program is functionalized properly, correct? So the question is, how can we prevent this from happening? The obvious solution is to functionalize less, along with other sensible acts such as refraining from excessively/needlessly creating objects, performing static calls to functions that don't access fields, etc... Is there another way though? Or can this only be done through careful code writing on the programmers' part? Does the JVM/JIT automatically optimize the bytecode during compile time to account for this?? Thanks a lot for your responses!!

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• Openning an App on click of link in email in android?

  - by Amit

  I have a strange requirement for my project.. Suppose I have an app say XYZ installed in an android phone and than I receive an email from the mail server which contains a link like http://XYZ.com/?params(i.e. X=1&Y=2&Z=3) now on click of this link I want to open the XYZ app if it is installed in the phone and in the Activity I would like to get these parameters X,Y and Z and if the app is not installed user should be redirected to play store for downloading XYZ app and after installation app takes charge and behaves as if it was already installed (Opening the first activity with those parameters). How can I achieve that ? I have no idea where to start so even the smallest pointer in right direction will be of great help.

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• How to know all id's that i have in the file main.xml in android?

  - by sgiro

  Hello guy's, i'm new at Android world, and i have a doubt, is there any method that give me the name of the id's i create in main.xml? For example i have this: main.xml <TextView android:id="@+id/text1" android:layout_width="70px" android:layout_height="70px" android:text="Google" /> <TextView android:id="@+id/text2" android:layout_width="70px" android:layout_height="70px" android:text="As" /> And what i want is the id name from the two TextView, is there any method that i can use in my class .java that give me for this example the id? In this case i want the (text1 and text2). Thanks and forgive mi English.

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• android localization: Is it a good practice to have only needed resource to put in localized folder?

  - by MobileDev123

  Hi, My application has 4 languages in it. However only one module needs to be localized out of 5, This module has 4 layout files and some images, remaining files can be there in default layout folder and drawable folders. My question is : is it good practice to put only needed files in localization folders, if I leave other files in its respective folders and don't copy them in translation folders, does my application throw NullPointerException when my application runs in other language? and Does android market have any size limit? (Also being a BB developer,AFAIK they do not allow OTA, if the application size grows more than 3 mb) [In case i need to copy the layout and image files]. Note about NullPointerException : it throws in string if you omit some string in localization and application runs in that particular locale. Thanks

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• untrusted (self-sign) certificate on android browser

  - by Basiclife

  Hi all, Apologies for the brevity of this question but due to an unfortunate series of events, I've managed to brick my PC so am posting from my phone... We've just set up Windows Small Business Server 2008 at work which has an external web portal accessible via HTTPS. We haven't yet bought?installed any certificates. The portal provides access to email, sharepoint, remote desktop, etc.... (I'm aware some of these are never going to work on the phone) From firefox / other desktop browsers, this displays an "untrusted cert' warning which I can choose to ignore. When browsing from my mobile I get a popup notification which says. "A secure connection could not be established" when I OK this (my only option) I see the standard android-generated "unable to load page - has it moved?" Page. Does anyone know of a way to either accept the certificate temporarily or allow untrusted certificates generally? I'm aware that the latter option is non-ideal in the mid to long term but at the moment, I need to access the portal and am willing to either toggle settings as/when required or forego using the mobile for banking, etc... to mitigate my risk. Thanks in advance for any help you can provide and apologies again for brevity In case it helps I'm on the G1 running android 1.6 using the default browser

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• Install a web certificate on an Android device

  - by martani_net

  To gain access to WIFI at university I have to login with my user/pass credentials. The certificate of their website (the local home page that asks for the credentials) is not recognized as a trusted certificate, so we install it separately on our computers. The problem is that I don't take my laptop with me often to university, so I usually want to connect using my HTC Magic, but I have no clue on how to install the certificate separately on Android, it is always rejected. [Edit2] : this is what is stated in their website Need for installation of official certificates CyberTrust validated by the CRU (http://www.cru.fr/wiki/scs/) The certificates contain information certified to generate encryption keys for data exchange, called "sensitive" as the password of a user. By connecting to CanalIP-UPMC, for example, the user must validate the identity of the server accepting the certificate appears on the screen in a "popup window". In reality, the user is unable to validate a certificate knowing, because a simple visual check of the license is impossible. Therefore, the certificates of the certification authority (CRU-Cybertrust Educationnal-ca.ca Cybertrust and-global-root-ca.ca) must be installed prior to the browser for the validity of the certificate server can be controlled automatically. Before you connect to the network-UPMC CanalIP you must register in your browser through the certification authority Cybertrust-Educationnal-ca.ca Download the Cybertrust-Educationnal-ca.ca, depending on your browser and select the link below : With Internet Explorer, click on the link following. With Firefox, click on the link following. With Safari, click the link following. If this procedure is not respected, a real risk is incurred by the user: that of being robbed password LDAP directory UPMC. A malicious server may in fact try very easily attack type "man-in-the-middle" by posing as the legitimate server at UPMC. The theft of a password allows the attacker to steal an identity for transactions over the Internet can engage the responsibility of the user trapped ... This is their website : http://www.canalip.upmc.fr/doc/Default.htm (in French, Google-translate it :)) Anyone knows how to install a web certificate on Android?

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• Android failure to boot on LG [migrated]

  - by Ukavi

  I need to recover data from my AT&T LG Thrill Android Phone Background: My AT&T LG Thrill phone's battery died a couple of days ago because I forgot to charge it. When I charged the phone and tried to turn it on, it showed the LG logo followed by the dropping balls and the AT&T "Rethink Possible" screen. I then get a mesage that the Application Google Services Framework has crashed and the phone goes into a loop with the dropping balls showing again followed by "Rethink Possible" screen. This sequence repeats itself over and over and the phone does not get out of this loop. I have been able to go into the recovery screen (both Safe Mode and the Android Recovery Service) and have cleared cache, etc. However, I DO NOT want to wipe user data and restore to factory settings as this will wipe all of my data (pictures, application data, etc). Solution Needed: I need a suggestion to a way of accessing my data so that I can back it up onto an SD card/computer. I DO NOT want to root the phone as this may void the warranty. What I'm looking for is a way of perhaps putting the original flash image on the micro SD card and then have the phone read that image. Or some other similar solution that will get the phone out of this loop and allow me to get to the data.

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• Android webbrowser returns code 500 for webpage on Nginx webserver

  - by Paxxil

  Hey! I've come to a very weird behavior of a web browser on android mobile phone (I've tried HTC Wildfire and HTC Desire phones). I have a web server with Nginx v0.8.54. When i try to open a web page on the phone it shows me error: The requested item could not be loaded! (Status code: 500) BUT it only happens when I am requesting page through Mobile network. On Wifi it works just fine .... but there is more .... if I stop Nginx and start Apache web server it works just fine on both Mobile network and wifi. I've also tried other mobile network and it is the same behavior. Some server stats: Firewall is OFF Selinux is OFF the web page (using Nginx web server) opens normally on any other browser (IE, FF, Opera, Chrome, Safari) on the laptop or PC Nothing in nginx error.log This is the only entry in access.log when the page is requested: xxx.xxx.xxx.xxx - - [17/Mar/2011:11:19:49 -0500] 200 "GET / HTTP/1.1" 27405 "-" "Mozilla/5.0 (Linux; U; Android 2.2; en-gb; Desire_A8181 Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1" "-" index.html has only "Hello World" string in it. There is no fishy javascript or anything else. .... but there is even more.... if i open the same page on another server, with the same Nginx build, with the same server and web server configuration.... it opens just fine. if anyone has any idea on what may be going on, i would really appreciate it if you let me know. Thanks! EDIT: i forgot to mention that page opens OK on Iphone and Nokia

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