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POAndroid crash when app is closed and reopened
 

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  1. POAndroid crash when app is closed and reopened
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    <p>I have a really simple android app that just displays a blank white screen. When I close the app by pressing the HOME button, then try to open the app again, it crashes and I get the "Force Close" button. In Eclipse I'm getting this error, "ActivityManager: Warning: Activity not started because the current activity is being kept for the user.". How do I fix this crash?</p> <pre><code>public class HelloAndroid extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(new Panel(this)); } class Panel extends SurfaceView implements SurfaceHolder.Callback { private TutorialThread _thread; public Panel(Context context) { super(context); // register our interest in hearing about changes to our surface SurfaceHolder holder = getHolder(); holder.addCallback(this); _thread = new TutorialThread(holder, this); setFocusable(true); } @Override public void onDraw(Canvas canvas) { // Clear the background canvas.drawColor(Color.WHITE); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // resize canvas here } @Override public void surfaceCreated(SurfaceHolder holder) { _thread.setRunning(true); _thread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { // simply copied from sample application LunarLander: // we have to tell thread to shut down &amp; wait for it to finish, or else // it might touch the Surface after we return and explode boolean retry = true; _thread.setRunning(false); while (retry) { try { _thread.join(); retry = false; } catch (InterruptedException e) { // we will try it again and again... } } } } class TutorialThread extends Thread { private SurfaceHolder _surfaceHolder; private Panel _panel; private boolean _run = false; public TutorialThread(SurfaceHolder surfaceHolder, Panel panel) { _surfaceHolder = surfaceHolder; _panel = panel; } public void setRunning(boolean run) { _run = run; } @Override public void run() { Canvas c; while (_run) { c = null; try { c = _surfaceHolder.lockCanvas(null); synchronized (_surfaceHolder) { _panel.onDraw(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) { _surfaceHolder.unlockCanvasAndPost(c); } } } } } </code></pre> <p>}</p> <p>Adding the LogCat</p> <pre><code>03-15 15:36:05.579: INFO/AndroidRuntime(4441): NOTE: attach of thread 'Binder Thread #2' failed 03-15 15:36:05.719: DEBUG/AndroidRuntime(4449): &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; 03-15 15:36:05.719: DEBUG/AndroidRuntime(4449): CheckJNI is OFF 03-15 15:36:05.719: DEBUG/dalvikvm(4449): creating instr width table 03-15 15:36:05.759: DEBUG/AndroidRuntime(4449): --- registering native functions --- 03-15 15:36:05.969: INFO/ActivityManager(1294): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.helloandroid/.HelloAndroid } 03-15 15:36:05.979: DEBUG/Launcher(1371): onPause+ 03-15 15:36:05.979: DEBUG/Launcher.DragController(1371): +endDrag: false 03-15 15:36:05.979: DEBUG/Launcher.DragController(1371): mDragging == false 03-15 15:36:05.979: DEBUG/Launcher.DragController(1371): -endDrag: false 03-15 15:36:05.979: DEBUG/Launcher(1371): onPause- 03-15 15:36:05.999: DEBUG/AndroidRuntime(4428): Shutting down VM 03-15 15:36:05.999: DEBUG/AndroidRuntime(4449): Shutting down VM 03-15 15:36:05.999: WARN/dalvikvm(4428): threadid=1: thread exiting with uncaught exception (group=0x4001d7e0) 03-15 15:36:06.009: DEBUG/dalvikvm(4449): Debugger has detached; object registry had 1 entries 03-15 15:36:06.009: INFO/AndroidRuntime(4449): NOTE: attach of thread 'Binder Thread #3' failed 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): FATAL EXCEPTION: main 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): java.lang.IllegalThreadStateException: Thread already started. 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at java.lang.Thread.start(Thread.java:1322) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at com.example.helloandroid.HelloAndroid$Panel.surfaceCreated(HelloAndroid.java:55) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.SurfaceView.updateWindow(SurfaceView.java:538) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:206) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.View.dispatchWindowVisibilityChanged(View.java:3888) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:725) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:725) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.ViewRoot.performTraversals(ViewRoot.java:748) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.view.ViewRoot.handleMessage(ViewRoot.java:1737) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.os.Handler.dispatchMessage(Handler.java:99) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.os.Looper.loop(Looper.java:123) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at android.app.ActivityThread.main(ActivityThread.java:4627) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at java.lang.reflect.Method.invokeNative(Native Method) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at java.lang.reflect.Method.invoke(Method.java:521) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 03-15 15:36:06.029: ERROR/AndroidRuntime(4428): at dalvik.system.NativeStart.main(Native Method) 03-15 15:36:06.039: WARN/ActivityManager(1294): Force finishing activity com.example.helloandroid/.HelloAndroid 03-15 15:36:06.541: WARN/ActivityManager(1294): Activity pause timeout for HistoryRecord{450300c0 com.example.helloandroid/.HelloAndroid} 03-15 15:36:06.549: DEBUG/Launcher(1371): onResume+ 03-15 15:36:06.549: DEBUG/Launcher.DragController(1371): +endDrag: false 03-15 15:36:06.549: DEBUG/Launcher.DragController(1371): mDragging == false 03-15 15:36:06.549: DEBUG/Launcher.DragController(1371): -endDrag: false 03-15 15:36:06.549: DEBUG/Launcher(1371): onResume- 03-15 15:36:08.645: ERROR/KINETO(1370): KLOG0C3- xmk_QueryOSQueue SDL Queue empty : WAIT_FOREVER </code></pre>
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    1. COPost the logcat please.
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    2. COYep, the error is caused by your `Thread`. Look at my answer below.
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    3. COBoth LunarLander and JetBoy crash after interrupeted by HOME and relaunched!
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