首先，我知道在stackoverflow上已经发布了类似的问题，但在这种情况下我似乎无法找到确切的问题。
我在 logcat 中收到了一些错误消息，总的来说我的程序非常不稳定并且经常意外关闭。
10-07 180852.056 EAndroidRuntime(1043) FATAL EXCEPTION Thread-85
10-07 180852.056 EAndroidRuntime(1043) java.lang.NullPointerException
10-07 180852.056 EAndroidRuntime(1043) at com.ophion.td2.GameEngine.Draw(GameEngine.java61)
10-07 180852.056 EAndroidRuntime(1043) at com.ophion.td2.GameThread.run(GameThread.java46)
10-07 180854.046 IChoreographer(1043) Skipped 49 frames! The application may be doing too much work on its main thread. The application may be doing too much work on its main thread.
10-07 180855.026 IProcess(1043) Sending signal. PID 1043 SIG 9'
那是 logcat，这里是我认为是问题所在的代码文件（我可能错了！）。游戏引擎：
public class GameEngine implements Runnable{
public int screenWidth;
public int screenHeight;
private Paint whitePaint;
private Paint textPaint;
/* private String currentTimeString */
Blop blop;
private Context context;
public void Init(Context context) {
this.context = context;
Resources resources = context.getResources();
whitePaint = new Paint();
whitePaint.setColor(Color.WHITE);
whitePaint.setStyle(Style.FILL);
textPaint = new Paint();
textPaint.setColor(Color.LTGRAY);
textPaint.setTextSize(40);
blop = new Blop(resources, 20, 20);
blop.setDirection(300);
setSurfaceDimensions(240, 160);
}
public void onDestroy() {
try {
} catch (Exception e) {
}
}
public void setSurfaceDimensions(int width, int height) {
screenWidth = width;
screenHeight = height;
}
public void Update() {
/*currentTimeString = new SimpleDateFormat("HH:mm:ss").format(new Date()); */
blop.move(screenWidth, screenHeight);
}
public void Draw(Canvas canvas) {
canvas.drawRect(0, 0, canvas.getWidth(), canvas.getHeight(), whitePaint);
/* canvas.drawText(currentTimeString, 30, 100, textPaint); */
blop.draw(canvas, blop.x, blop.y, textPaint);
}
@Override
public void run() {
// TODO Auto-generated method stub
}
}
还有游戏线程
public class GameThread extends Thread {
private SurfaceHolder surfaceHolder;
private Canvas canvas;
private long delay = 1000000000L / 25;
private long beforeTime = 0;
private long afterTime = 0;
private long timeDiff = 0;
private long sleepTime;
private long overSleepTime = 0;
private long excess = 0;
public final static int RUNNING = 1;
public final static int PAUSED = 2;
public static final int MAX_FRAME_SKIPS = 5;
int state = RUNNING;
GameEngine gameEngine;
public GameThread(SurfaceHolder surfaceHolder, Context context,
Handler handler, GameEngine gameEngine) {
this.surfaceHolder = surfaceHolder;
this.gameEngine = gameEngine;
}
@Override
public void run() {
while (state == RUNNING) {
beforeTime = System.nanoTime();
gameEngine.Update();
canvas = null;
try {
canvas = surfaceHolder.lockCanvas(null);
synchronized (surfaceHolder) {
gameEngine.Draw(canvas);
}
} finally {
if (canvas != null) {
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
afterTime = System.nanoTime();
timeDiff = afterTime - beforeTime;
sleepTime = ((delay) - timeDiff) - overSleepTime;
if (sleepTime > 0) {
try {
sleep(sleepTime / 1000000L);
} catch (InterruptedException ex) {
}
overSleepTime = (System.nanoTime() - afterTime) - sleepTime;
} else {
excess -= sleepTime;
overSleepTime = 0L;
}
int skips = 0;
while ((excess > delay) && (skips < MAX_FRAME_SKIPS)) {
excess -= delay;
gameEngine.Update();
skips++;
}
}
}
}
我希望你能帮帮我！