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POAndroid App runs perfectly when ran after installation, but shows white screen on second run?
 

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  1. POAndroid App runs perfectly when ran after installation, but shows white screen on second run?
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    <p>I used an idea from first answer to <a href="https://stackoverflow.com/questions/6776327/how-to-pause-resume-thread-in-android">this</a> question in order to pause and resume drawing on canvas. It worked well, but a new problem that I'm facing is, app is not starting up if I press Home button and start it again. I've called <code>onResume()</code> when user touches the screen i.e. <code>MotionEvent.ACTION_DOWN</code> and <code>onPause()</code> in <code>MotionEvent.ACTION_UP</code>. This works perfectly fine which I've confirmed somehow. My question is if <code>onResume()</code> is working now, why isn't it working when App is started after pressing Home?</p> <p>Edit: This is Thread Class which handles when to draw &amp; when not.</p> <pre><code>package com.example.testsurfaceview; import android.graphics.Canvas; import android.view.SurfaceHolder; public class CanvasThread extends Thread { private SurfaceHolder _surfaceHolder; private SurfaceTest _surfaceTest; private Object mPauseLock; private boolean mPaused; private boolean mRun; // private boolean _run = false; public CanvasThread(SurfaceHolder surfaceHolder, SurfaceTest surfaceTest) { _surfaceHolder = surfaceHolder; _surfaceTest = surfaceTest; mPauseLock = new Object(); mPaused = false; mRun = false; } public void setRunning(boolean run) { mRun = run; } @Override public void run() { // TODO Auto-generated method stub // super.run(); Canvas canvas; while (mRun) { canvas = null; try { canvas = _surfaceHolder.lockCanvas(); synchronized (_surfaceHolder) { _surfaceTest.letsdraw(canvas); } } 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 (canvas != null) { _surfaceHolder.unlockCanvasAndPost(canvas); } } synchronized (mPauseLock) { while (mPaused) { try { mPauseLock.wait(); } catch (InterruptedException e) { } } } } } /** * Call this on pause. */ public void onPause() { synchronized (mPauseLock) { mPaused = true; } } /** * Call this on resume. */ public void onResume() { synchronized (mPauseLock) { mPaused = false; mPauseLock.notifyAll(); } } } </code></pre> <p>And here's a part of code from a class that extends SurfaceView and implements SurfaceHolder.Callback</p> <pre><code>public SurfaceTest(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub getHolder().addCallback(this); canvasThread = new CanvasThread(getHolder(), this); setFocusable(true); } public SurfaceTest(Context context) { super(context); // TODO Auto-generated constructor stub getHolder().addCallback(this); canvasThread = new CanvasThread(getHolder(), this); setFocusable(true); } public SurfaceTest(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub getHolder().addCallback(this); canvasThread = new CanvasThread(getHolder(), this); setFocusable(true); } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { // TODO Auto-generated method stub //getHolder().addCallback(this); canvasThread = new CanvasThread(getHolder(), this); setFocusable(true); canvasThread.setRunning(true); canvasThread.start(); initializer(); //its a method where I'm only initializing Paint() objects this.setOnTouchListener(this); } @Override public void surfaceCreated(SurfaceHolder arg0) { // TODO Auto-generated method stub canvasThread.setRunning(true); canvasThread.start(); initializer(); this.setOnTouchListener(this); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { // TODO Auto-generated method stub canvasThread.setRunning(false); while (true) { try { canvasThread.join(); break; } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub try { Thread.sleep(50); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } switch (event.getAction()) { case MotionEvent.ACTION_DOWN: canvasThread.onResume(); sx = event.getX(); sy = event.getY(); fx = 0; fy = 0; break; case MotionEvent.ACTION_MOVE: x = event.getX(); y = event.getY(); break; case MotionEvent.ACTION_UP: fx = event.getX(); fy = event.getY(); x = 0; y = 0; canvasThread.onPause(); break; } return true; } </code></pre> <p>LogCat:</p> <pre><code>06-03 10:54:28.203: D/AndroidRuntime(322): CheckJNI is ON 06-03 10:54:28.494: D/AndroidRuntime(322): --- registering native functions --- 06-03 10:54:29.734: D/dalvikvm(251): GC_EXPLICIT freed 160 objects / 8248 bytes in 116ms 06-03 10:54:37.143: D/PackageParser(59): Scanning package: /data/app/vmdl26358.tmp 06-03 10:54:43.624: D/dalvikvm(251): GC_EXPLICIT freed 126 objects / 10296 bytes in 1260ms 06-03 10:54:47.654: I/PackageManager(59): Removing non-system package:com.example.testsurfaceview 06-03 10:54:47.654: I/ActivityManager(59): Force stopping package com.example.testsurfaceview uid=10038 06-03 10:54:47.654: I/Process(59): Sending signal. PID: 311 SIG: 9 06-03 10:54:47.684: I/UsageStats(59): Unexpected resume of com.android.launcher while already resumed in com.example.testsurfaceview 06-03 10:54:47.724: I/WindowManager(59): WIN DEATH: Window{43fe9438 SurfaceView paused=false} 06-03 10:54:47.733: I/WindowManager(59): WIN DEATH: Window{44034690 com.example.testsurfaceview/com.example.testsurfaceview.MainActivity paused=false} 06-03 10:54:47.853: W/InputManagerService(59): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@4408bf18 06-03 10:54:47.883: W/KeyCharacterMap(118): No keyboard for id 0 06-03 10:54:47.883: W/KeyCharacterMap(118): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 06-03 10:54:49.123: D/dalvikvm(59): GC_FOR_MALLOC freed 9620 objects / 514768 bytes in 94ms 06-03 10:54:49.163: D/PackageManager(59): Scanning package com.example.testsurfaceview 06-03 10:54:49.163: I/PackageManager(59): Package com.example.testsurfaceview codePath changed from /data/app/com.example.testsurfaceview-1.apk to /data/app/com.example.testsurfaceview-2.apk; Retaining data and using new 06-03 10:54:49.163: I/PackageManager(59): /data/app/com.example.testsurfaceview-2.apk changed; unpacking 06-03 10:54:49.183: D/installd(35): DexInv: --- BEGIN '/data/app/com.example.testsurfaceview-2.apk' --- 06-03 10:54:50.093: D/dalvikvm(330): DexOpt: load 114ms, verify 476ms, opt 22ms 06-03 10:54:50.133: D/installd(35): DexInv: --- END '/data/app/com.example.testsurfaceview-2.apk' (success) --- 06-03 10:54:50.143: W/PackageManager(59): Code path for pkg : com.example.testsurfaceview changing from /data/app/com.example.testsurfaceview-1.apk to /data/app/com.example.testsurfaceview-2.apk 06-03 10:54:50.143: W/PackageManager(59): Resource path for pkg : com.example.testsurfaceview changing from /data/app/com.example.testsurfaceview-1.apk to /data/app/com.example.testsurfaceview-2.apk 06-03 10:54:50.143: D/PackageManager(59): Activities: com.example.testsurfaceview.MainActivity 06-03 10:54:50.163: I/ActivityManager(59): Force stopping package com.example.testsurfaceview uid=10038 06-03 10:54:50.253: I/installd(35): move /data/dalvik-cache/data@app@com.example.testsurfaceview-2.apk@classes.dex -&gt; /data/dalvik-cache/data@app@com.example.testsurfaceview-2.apk@classes.dex 06-03 10:54:50.253: D/PackageManager(59): New package installed in /data/app/com.example.testsurfaceview-2.apk 06-03 10:54:50.384: I/ActivityManager(59): Force stopping package com.example.testsurfaceview uid=10038 06-03 10:54:50.454: D/dalvikvm(118): GC_EXPLICIT freed 628 objects / 39856 bytes in 58ms 06-03 10:54:50.664: W/RecognitionManagerService(59): no available voice recognition services found 06-03 10:54:50.753: D/dalvikvm(150): GC_EXPLICIT freed 1808 objects / 92712 bytes in 282ms 06-03 10:54:50.873: D/dalvikvm(59): GC_EXPLICIT freed 7350 objects / 467208 bytes in 109ms 06-03 10:54:50.873: I/installd(35): unlink /data/dalvik-cache/data@app@com.example.testsurfaceview-1.apk@classes.dex 06-03 10:54:50.883: D/AndroidRuntime(322): Shutting down VM 06-03 10:54:50.893: D/dalvikvm(322): Debugger has detached; object registry had 1 entries 06-03 10:54:51.344: D/AndroidRuntime(336): &gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; AndroidRuntime START &lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; 06-03 10:54:51.344: D/AndroidRuntime(336): CheckJNI is ON 06-03 10:54:51.483: D/AndroidRuntime(336): --- registering native functions --- 06-03 10:54:52.093: I/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.testsurfaceview/.MainActivity } 06-03 10:54:52.173: D/AndroidRuntime(336): Shutting down VM 06-03 10:54:52.183: I/ActivityManager(59): Start proc com.example.testsurfaceview for activity com.example.testsurfaceview/.MainActivity: pid=342 uid=10038 gids={} 06-03 10:54:52.193: D/jdwp(336): Got wake-up signal, bailing out of select 06-03 10:54:52.193: D/dalvikvm(336): Debugger has detached; object registry had 1 entries 06-03 10:54:52.263: I/AndroidRuntime(336): NOTE: attach of thread 'Binder Thread #3' failed 06-03 10:54:53.093: I/ActivityManager(59): Displayed activity com.example.testsurfaceview/.MainActivity: 922 ms (total 1729005 ms) 06-03 10:54:58.213: D/dalvikvm(262): GC_EXPLICIT freed 249 objects / 11920 bytes in 101ms 06-03 10:55:05.213: D/dalvikvm(118): GC_EXPLICIT freed 903 objects / 49928 bytes in 169ms 06-03 10:55:20.704: W/KeyCharacterMap(342): No keyboard for id 0 06-03 10:55:20.704: W/KeyCharacterMap(342): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 06-03 10:55:29.574: D/dalvikvm(118): GC_EXTERNAL_ALLOC freed 303 objects / 16096 bytes in 54ms 06-03 10:55:29.783: D/SntpClient(59): request time failed: java.net.SocketException: Address family not supported by protocol 06-03 10:55:30.993: W/ActivityManager(59): Activity destroy timeout for HistoryRecord{43ee3770 com.example.testsurfaceview/.MainActivity} 06-03 10:55:33.983: I/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.testsurfaceview/.MainActivity } 06-03 10:55:34.133: W/WindowManager(59): Rebuild removed 4 windows but added 2 06-03 10:55:43.993: W/ActivityManager(59): Launch timeout has expired, giving up wake lock! 06-03 10:55:44.083: W/ActivityManager(59): Activity idle timeout for HistoryRecord{43fb3800 com.example.testsurfaceview/.MainActivity} </code></pre>
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    1. PTQuestion
    1. USCommunity
    1. USRavi Ojha
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      1. LTLinked
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    1. PO
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    1. COcan you post your code and logcat error?
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      1. POAndroid App runs perfectly when ran after installation, but shows white screen on second run?
      1. USSharad Mhaske
    2. CO@Sharad alright, I updated, though it might seem a bit complicated.
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      1. POAndroid App runs perfectly when ran after installation, but shows white screen on second run?
      1. USRavi Ojha
    3. COAdd logging and see which comes first. That way you can see if you are in a potential dead lock or not.
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      1. POAndroid App runs perfectly when ran after installation, but shows white screen on second run?
      1. USSimon Zettervall
 

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