Question

当游戏结束时，它应该打开一个警告对话，说游戏已经结束，你得到了什么分数。它执行此操作但不止一次，它会一直打开对话框，直到应用程序崩溃。我无法弄清楚它为什么会这样做。 logcat也不会报告错误。我尝试在try {}中放置打开对话框的代码，这使得它有时会工作但不一致。你们是否知道导致问题的原因是什么？

以下是相关代码。

class SnakeView extends SurfaceView implements Runnable {

public SnakeView(Context context, Point size){
    super(context);
    handler = new Handler(context.getMainLooper());

    mContext = context;

    mScreenWidth = size.x;
    mScreenHeight = size.y;

    mBlockSize = mScreenWidth / NUM_BLOCKS_WIDE;
    mNumBlocksHigh = ((mScreenHeight)) / mBlockSize;

    loadSound();

    mHolder = getHolder();
    mPaint = new Paint();

    mSnakeXs = new int[200];
    mSnakeYs = new int[200];

    startGame();
}
public void updateGame(){
    if (mSnakeXs[0]== mMouseXs && mSnakeYs[0] == mMouseYs){
        eatMouse();
    }

    moveSnake();
    if (detectDeath()){
        mSoundPool.play(mDead_sound, 1, 1, 0, 0, 1);

        final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
        alertDialogBuilder
                .setTitle("Game Over!")
                .setMessage("Your score: " + mScore + "!")
                .setCancelable(false)
                .setPositiveButton("New", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent =  new Intent(mContext, SnakeActivity.class);
                        mContext.startActivity(intent);
                    }
                })
                .setNegativeButton("Exit", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(mContext, Start.class);
                        mContext.startActivity(intent);
                    }
                });
        runOnUiThread(new Runnable() {
            @Override
            public void run() {

                alertDialogBuilder.show();
            }
        });


    }


}
private void runOnUiThread(Runnable r){
    handler.post(r);
}

  }

Answer 1

好吧，我不知道context.getMainLooper（）是否正在循环所有内容，或者你的可运行逻辑只是循环回来，但是你可以在类hasdialogBeenShown中声明一个布尔值，在SnakeView中将它设置为false，然后将run（）代码设置为：

public void run(){
    if(!hasDialogBeenShown){
        alertDialogBuilder.show();
        hasDialogBeenShown=true;
    }
}

这样的事情应该“解决”你的问题，但为什么alertDialogBuilder.show（）必须在runnable中呢？为什么它必须runOnUiThread？

Answer 2

请注意，我只是引入变量dead来跟踪对话框。这是为了防止程序完成创建新对话框的整个过程，这可能会导致可能导致程序崩溃的OOM异常。

class SnakeView extends SurfaceView implements Runnable {
    boolean dead = false;
    public SnakeView(Context context, Point size){
        super(context);
        handler = new Handler(context.getMainLooper());

        mContext = context;

        mScreenWidth = size.x;
        mScreenHeight = size.y;

        mBlockSize = mScreenWidth / NUM_BLOCKS_WIDE;
        mNumBlocksHigh = ((mScreenHeight)) / mBlockSize;

        loadSound();

        mHolder = getHolder();
        mPaint = new Paint();

        mSnakeXs = new int[200];
        mSnakeYs = new int[200];

        startGame();
    }
    public void updateGame(){
        if (mSnakeXs[0]== mMouseXs && mSnakeYs[0] == mMouseYs){
            eatMouse();
        }

        moveSnake();
        if (detectDeath()&& !dead){
            mSoundPool.play(mDead_sound, 1, 1, 0, 0, 1);

            final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(mContext);
            alertDialogBuilder
                    .setTitle("Game Over!")
                    .setMessage("Your score: " + mScore + "!")
                    .setCancelable(false)
                    .setPositiveButton("New", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent intent =  new Intent(mContext, SnakeActivity.class);
                            mContext.startActivity(intent);
                        }
                    })
                    .setNegativeButton("Exit", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent intent = new Intent(mContext, Start.class);
                            mContext.startActivity(intent);
                        }
                    });
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
    dead = true;
                    alertDialogBuilder.show();
                }
            });


        }


    }
    private void runOnUiThread(Runnable r){
        handler.post(r);
    }

      }

Answer 3

删除此：

runOnUiThread(new Runnable() {
@Override
    public void run() {
        alertDialogBuilder.show();
    }
});

把这个：

final AlertDialog dialog2 = alertDialogBuilder.create();
dialog2.show();

alertdialog尝试多次打开

3 个答案: