Question

我正在用SurfaceView和线程制作游戏。在主线程中，我从SurfaceHolder锁定了画布，然后解锁了画布并发布了锁定它时获得的同一画布。当我使用简单的意图重新启动游戏时，出现以下错误消息：

java.lang.IllegalArgumentException: canvas object must be the same instance that was previously returned by lockCanvas
        at android.view.Surface.unlockSwCanvasAndPost(Surface.java:370)
        at android.view.Surface.unlockCanvasAndPost(Surface.java:363)
        at android.view.SurfaceView$3.unlockCanvasAndPost(SurfaceView.java:1089)
        at com.my.app.MainThread.run(MainThread.java:61)

这是我的代码：

Log.d(TAG, "Locking canvas!");
canvas = this.surfaceHolder.lockCanvas();

synchronized (surfaceHolder) {
    this.gameView.update(millitime);
    if(canvas != null)
        this.gameView.draw(canvas);
}
if(canvas != null) {
    Log.d(TAG, "Unlocking canvas!");
    this.surfaceHolder.unlockCanvasAndPost(canvas);
} else {
    Log.d(TAG, "Canvas is null!");
}

出什么问题了？我确实返回了相同的画布，但是已对其进行了编辑。所以那不是问题吧？谢谢！

顺便说一句，我看到了这篇文章：Canvas object must be the same instance that was previously returned by lockCanvas，但在那个问题上，SurfaceHolder.unlockAndPost在if（canvas！= null）之外。

unlockCanvasAndPost画布对象必须与lockCanvas

0 个答案: