当Surfaceview通过接听电话或退出并返回应用程序进入后台时,我的应用程序崩溃了。我读到,在这些情况下,surfacedestroyed并没有接到电话 给出的解决方案对我没有用。 如果有人可以帮我处理我的代码,我将不胜感激。 感谢
public GameLoopThread(GameView view)
{
this.view=view;
}
public void setRunning (boolean run)
{
running=run;
}
@Override
public void run() {
long ticksPerSecond=1000/FPS;
long startTime;
long sleepTime;
while (running)
{
Canvas c=null;
startTime=System.currentTimeMillis();
try {
c=view.getHolder().lockCanvas();
synchronized (view.getHolder()) {
view.onDraw(c);
}
} catch (Exception e) {
// TODO: handle exception
}
finally{
if(c!=null)
view.getHolder().unlockCanvasAndPost(c);
}
sleepTime=ticksPerSecond-(System.currentTimeMillis()-startTime);
try
{if(sleepTime>0)
sleep(sleepTime);
else
sleep(10);
}
catch(Exception e){}
synchronized (mPauseLock) {
while (!running) {
try {
mPauseLock.wait();
} catch (InterruptedException e) {
}
}
}
}
and in the surfaceview:
public void surfaceDestroyed(SurfaceHolder holder) {
if(gameLoopThread.isAlive())
{
boolean retry = true;
gameLoopThread.setRunning(false);
while (retry) {
try {
gameLoopThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
if(!gameLoopThread.isAlive())
{
gameLoopThread.setRunning(true);
gameLoopThread.start();
}
}
也许logcat会有所帮助:
10-22 09:35:06.310:DEBUG / Buddies --------------------------->(10985):服务: OnReceive ACTION_HOME_RESUME被调用 10-22 09:35:06.315:DEBUG / AndroidRuntime(3275):关闭VM 10-22 09:35:06.315:WARN / dalvikvm(3275):threadid = 1:线程退出,未捕获异常(组= 0x4001e578) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):致命异常:主要 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):java.lang.NullPointerException 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):atmer.idunku3.GameView $ 1.surfaceDestroyed(GameView.java:126) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.SurfaceView.reportSurfaceDestroyed(SurfaceView.java:613) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.SurfaceView.updateWindow(SurfaceView.java:498) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.SurfaceView.updateWindow(SurfaceView.java:407) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:217) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.View.dispatchWindowVisibilityChanged(View.java:4080) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.ViewRoot.performTraversals(ViewRoot.java:790) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.view.ViewRoot.handleMessage(ViewRoot.java:1868) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.os.Handler.dispatchMessage(Handler.java:99) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.os.Looper.loop(Looper.java:123) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):在android.app.ActivityThread.main(ActivityThread.java:3691) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):at java.lang.reflect.Method.invokeNative(Native Method) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):at java.lang.reflect.Method.invoke(Method.java:507) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:847) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605) 10-22 09:35:06.315:ERROR / AndroidRuntime(3275):at dalvik.system.NativeStart.main(Native Method) 10-22 09:35:06.320:ERROR /(18080):Dumpstate> /数据/日志/ dumpstate_app_error
答案 0 :(得分:3)
我的应用程序随机(经常)在返回上一个活动时崩溃。 事实证明“try”语句没有按预期工作,因为在getHolder()方法之后Canvas c仍然可以为null。
while (running) {
Canvas c=null;
startTime=System.currentTimeMillis();
try {
c=view.getHolder().lockCanvas();
if(c!=null){ // <- this is the line of code I had to add to make it work
synchronized (view.getHolder()) {
view.onDraw(c);
}
}
} catch (Exception e) {}
finally{
if(c!=null)
view.getHolder().unlockCanvasAndPost(c);
}
//...
}
答案 1 :(得分:2)
我不认为这部分是必要的:
synchronized (mPauseLock) {
while (!running) {
try {
mPauseLock.wait();
} catch (InterruptedException e) {
}
}
}
如果你使用这个,你需要通知才能释放对wait()的锁定; 但尝试使用相同的代码,而不使用synchronized(mPauseLock)
编辑:
当您按下主页按钮时,您的问题的解决方案,应用程序崩溃,执行此操作:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
gameView = new GameView(this);
setContentView(gameView);
}
@Override
public void onPause(){
super.onPause();
gameView.gameLoopThread.setRunning(false);
finish();
}
在GameView(SurfaceView)中创建构造函数:
public GameLoopThread gameLoopThread;
public GameView(Context context) {
super(context);
gameLoopThread = new GameLoopThread(this);
}