2
我想用SurfaceView
开发一款游戏。问题是,当我用surfaceDestroyed()
方法销毁thread
时,应用程序在thread.join()
中停止,但如果不用 在onDraw()
中绘制画布(canvas.drawColor(Color.GREEN);
),则一切正常。 如何绘制画布并致电thread.join()
?Android SurfaceView onDraw暂停Thread.join()
(我从互联网上测试了许多例如游戏,他们都有同样的问题,当你打例如回去按钮,你会得到一个FATAL EXCEPTION
因为thread
仍在运行)
下面是代码尽可能简单。 谢谢
public class GameView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder holder;
private GameLoopThread gameLoopThread;
public GameView(Context context) {
super(context);
holder = getHolder();
holder.addCallback(this);
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
if (gameLoopThread == null) {
gameLoopThread = new GameLoopThread(this);
gameLoopThread.setRunning(true);
gameLoopThread.start();
Log.e("thread", "iniciado");
}
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
gameLoopThread.setRunning(false);
boolean retry = true;
while (retry) {
try {
gameLoopThread.join();
retry = false;
} catch (InterruptedException e) {
}
}
Log.e("thread", "finalizado");
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.GREEN);
}
public static class GameLoopThread extends Thread {
private static final int FPS = 20;
private GameView view;
private boolean running;
public GameLoopThread(GameViwe gameView) {
this.view = gameView;
}
public void setRunning(boolean run) {
running = run;
}
@Override
public void run() {
long ticksPS = 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);
}
} finally {
if (c != null) {
view.getHolder().unlockCanvasAndPost(c);
}
}
sleepTime = ticksPS - (System.currentTimeMillis() - startTime);
try {
if (sleepTime > 0)
sleep(sleepTime);
else
sleep(10);
} catch (Exception e) {
}
}
}
}
}