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POForce close on resuming an app using SurfaceView
 

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    <p>First, note that exactly the same thing happens with the LunarLander example. Anyways, this works great until I leave the app and try to return to it, whereupon I get a force close (IllegalThreadStateException).</p> <p>MainGameActivity:</p> <pre><code>package com.tests.testgame1; import android.app.Activity; import android.os.Bundle; import android.util.Log; public class MainGameActivity extends Activity { private static MainGameView mainGameView; //private static Thread mainGameThread; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mainGameView = new MainGameView(getApplicationContext()); //mainGameThread = mainGameView.getThread(); // if (savedInstanceState == null) { // // we were just launched: set up a new game // mainGameThread.setState(mainGameThread.STATE_READY); // Log.w(this.getClass().getName(), "SIS is null"); // } else { // // we are being restored: resume a previous game // mainGameThread.restoreState(savedInstanceState); // Log.w(this.getClass().getName(), "SIS is nonnull"); // } setContentView(mainGameView); } @Override protected void onStart() { super.onStart(); // The activity is about to become visible. } @Override protected void onResume() { super.onResume(); mainGameView.unpauseGame(); // The activity has become visible (it is now "resumed"). } @Override protected void onPause() { super.onPause(); mainGameView.pauseGame(); // Another activity is taking focus (this activity is about to be "paused"). } @Override protected void onStop() { super.onStop(); // The activity is no longer visible (it is now "stopped") } @Override protected void onDestroy() { super.onDestroy(); // The activity is about to be destroyed. } @Override protected void onSaveInstanceState(Bundle outState) { // just have the View's thread save its state into our Bundle super.onSaveInstanceState(outState); // mainGameThread.saveState(outState); Log.w(this.getClass().getName(), "SIS called"); } } </code></pre> <p>MainGameView:</p> <pre><code>package com.tests.testgame1; import android.content.Context; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView; public class MainGameView extends SurfaceView implements SurfaceHolder.Callback { private static final String TAG = "MainGameView"; // MainGameThread mainGameThread; // SurfaceHolder mainSurfaceHolder; Context mainContext; public MainGameView(Context context) { super(context); mainSurfaceHolder = getHolder(); mainSurfaceHolder.addCallback(this); mainContext = context; mainGameThread = new MainGameThread(this, mainSurfaceHolder, mainContext); Log.d(TAG, "View created"); } public Thread getThread() { return mainGameThread; } public void pauseGame() { mainGameThread.pauseGame(); } public void unpauseGame() { //mainGameThread.start(); mainGameThread.unpauseGame(); } // @Override public void onWindowFocusChanged(boolean hasWindowFocus) { if (!hasWindowFocus) mainGameThread.pauseGame(); } public void onDraw() { } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder arg0) { mainGameThread.setRunning(true); mainGameThread.start(); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { // 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; mainGameThread.setRunning(false); while (retry) { try { mainGameThread.join(); retry = false; } catch (InterruptedException e) { } } } } </code></pre> <p>MainGameThread:</p> <pre><code>package com.tests.testgame1; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.util.Log; import android.view.SurfaceHolder; import android.view.View; class MainGameThread extends Thread { enum GameStates { GameStateRunning, GameStatePaused } private boolean running; private GameStates gameMode; private View view; private Context context; private SurfaceHolder surfaceHolder; Bitmap backgroundImage; public MainGameThread(View _view, SurfaceHolder _surfaceHolder, Context _context) { this.view = _view; this.surfaceHolder = _surfaceHolder; this.context = _context; this.running = true; this.gameMode = GameStates.GameStateRunning; Resources res = context.getResources(); backgroundImage = BitmapFactory.decodeResource(res, R.drawable.background); } public void setRunning(boolean b) { running = b; } @Override public void run() { while (running) { if (gameMode == GameStates.GameStateRunning) doStep(); Canvas c = null; try { c = surfaceHolder.lockCanvas(null); synchronized (surfaceHolder) { 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) { synchronized (surfaceHolder) { surfaceHolder.unlockCanvasAndPost(c); } } } } } private void doDraw(Canvas canvas) { canvas.drawBitmap(backgroundImage, 0, 0, null); //canvas.drawColor(Color.BLUE); } private void doStep() { } public void pauseGame() { // synchronized (surfaceHolder) { if (gameMode == GameStates.GameStateRunning){ gameMode = GameStates.GameStatePaused; } } } public void unpauseGame() { synchronized (surfaceHolder) { if (gameMode == GameStates.GameStatePaused){ gameMode = GameStates.GameStateRunning; } } } } </code></pre> <p>Stack trace:</p> <pre><code>Test Game [Android Application] DalvikVM[localhost:8625] Thread [&lt;1&gt; main] (Suspended (exception IllegalThreadStateException)) MainGameView(SurfaceView).updateWindow(boolean) line: 545 MainGameView(SurfaceView).onWindowVisibilityChanged(int) line: 206 MainGameView(View).dispatchWindowVisibilityChanged(int) line: 3891 FrameLayout(ViewGroup).dispatchWindowVisibilityChanged(int) line: 719 LinearLayout(ViewGroup).dispatchWindowVisibilityChanged(int) line: 719 PhoneWindow$DecorView(ViewGroup).dispatchWindowVisibilityChanged(int) line: 719 ViewRoot.performTraversals() line: 744 ViewRoot.handleMessage(Message) line: 1727 ViewRoot(Handler).dispatchMessage(Message) line: 99 Looper.loop() line: 123 ActivityThread.main(String[]) line: 4627 Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method] Method.invoke(Object, Object...) line: 521 ZygoteInit$MethodAndArgsCaller.run() line: 868 ZygoteInit.main(String[]) line: 626 NativeStart.main(String[]) line: not available [native method] Thread [&lt;6&gt; Binder Thread #2] (Running) Thread [&lt;5&gt; Binder Thread #1] (Running) Thread [&lt;7&gt; Binder Thread #3] (Running) </code></pre>
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