Question

当用户完成游戏以显示他的观点和时间时，我想弹出一个对话框。我读到了runOnUiThread，我尝试在我的代码中实现解决方案，但是没有用。我收到以下错误：

“无法在未调用的线程内创建处理程序 Looper.prepare（）“

我的gameCompleted类中有一个名为SurfaceView的bool变量，当这变为真时，我调用showDialogGameCompleted()类中实现的方法Activity。我哪里错了？

我的活动类：

public class Canvastutorial extends Activity {

final Context context = this;
Dialog dialog;

/** Called when the activity is first created. */
@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.play_layout);       
}    

// THE METHOD I CALL FROM MY SURFACEVIEW CLASS IN ORDER TO SHOW THE DIALOG
public void showDialogGameCompleted()
{           
    dialog= new Dialog(context);
    dialog.setContentView(R.layout.custom);
    dialog.setTitle("PUZZLE COMPLETED!");

        // set the custom dialog components - text, image and button
        TextView text = (TextView) dialog.findViewById(R.id.text);
        text.setText("Congratulations!\nPoints: \nMoves: \nTime: ");
        ImageView image = (ImageView) dialog.findViewById(R.id.image);
        image.setImageResource(R.drawable.cup);

        Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
        // if button is clicked, close the custom dialog
        dialogButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                dialog.dismiss();
            }
        });

        Canvastutorial.this.runOnUiThread(new Runnable() {
            public void run() {
                dialog.show();
            }
        });       
}

我的SurfaceView类：

public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private CanvasThread canvasthread;
private Canvastutorial canvastutorial= new Canvastutorial();



public MySurfaceView(Context context, AttributeSet attrs) {
    super(context, attrs); 
    // TODO Auto-generated constructor stub

    getHolder().addCallback(this);
    canvasthread = new CanvasThread(getHolder(), this);
    setFocusable(true);     
}

 public MySurfaceView(Context context) {
       super(context);
        getHolder().addCallback(this);
        canvasthread = new CanvasThread(getHolder(), this);
        setFocusable(true);
    }


@Override
public void onDraw(Canvas canvas) {

    if(canvas!=null)
    {

        switch (w)
        {
            case MENU:                  
                //menu stuff
                break;

            case GAME:

                // WHEN THE GAME IS COMPLETED I CALL THE
                 //showDialogGameCompleted METHOD WHICH IS IMPLEMENTED IN MY ACTIVITY CLASS
                if(gameCompleted)
                {
                    gameCompleted=false;
                    canvastutorial.showDialogGameCompleted();
                }                   
            break;
        }
    }
}    

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
        int height) {
    // TODO Auto-generated method stub

}
@Override
public void surfaceCreated(SurfaceHolder holder) {      

    canvasthread.setRunning(true);
    canvasthread.start();


}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    // TODO Auto-generated method stub
    boolean retry = true;
    canvasthread.setRunning(false);
    while (retry) {
        try {
            canvasthread.join();
            retry = false;
        } catch (InterruptedException e) {
            // we will try it again and again...
        }
    }

}

My Thread class：

public class CanvasThread extends Thread {
private SurfaceHolder _surfaceHolder;
private MySurfaceView _mySurfaceView;
private boolean _run = false;

public CanvasThread(SurfaceHolder surfaceHolder, MySurfaceView mySurfaceView) {
    _surfaceHolder = surfaceHolder;
    _mySurfaceView = mySurfaceView;
}

public void setRunning(boolean run) {
    _run = run;
}

@Override
public void run() {
    Canvas c;
    while (_run)
    {
        c = null;
        try
        {
            c = _surfaceHolder.lockCanvas(null);
            synchronized (_surfaceHolder)
            {
                _mySurfaceView.onDraw(c);
            }
        }
        finally
        {
            // do this in a finally so that if an exception is thrown
            // during the above, we don't leave the Surface in an
            // inconsistent state
            if (c != null)
                _surfaceHolder.unlockCanvasAndPost(c);
        }
    }
}
}

Answer 1

你不能从你的线程中调用它。因为它仍然有效。我认为你需要使用Handler。查看这个答案。也许它可以帮到你。 https://stackoverflow.com/a/16886486/3077964

在SurfaceView上游戏结束时显示弹出对话框

1 个答案: