Question

我正在进行一场2D游戏，我试图在我绘制的地方制作视图并更新所有内容，告诉包含它的活动游戏结束并在屏幕上显示弹出窗口。问题是我不知道如何从视图中访问活动中的方法，因为它们在不同的线程上工作。

代码看起来或多或少像这样，我想从视图类访问方法displayFrame（）。实际代码中的方法对其他textViews等执行更多操作，只有活动才能访问。

public class MainActivity extends Activity{

    private MyView myView;
    RelativeLayout finalFrame;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        myView = new MyView(this.getApplicationContext());
        this.setContentView(myView);

        finalFrame = (RelativeLayout) findViewById(R.id.framefinal);
    }

    private void displayFrame(){
        this.finalFrame.setVisibility(View.VISIBLE);
    }
}

public class MyView extends SurfaceView implements SurfaceHolder.Callback{
    private MyThread myThread;
    private boolean finished = false;

    public MyView(Context context) {
        super(context);

        getHolder().addCallback(this);
        this.myThread = new MyThread(getHolder(), this);

        this.myThread.setRunning(true);
    }

    public void update() {
        this.finished = someMethod();
        if(this.finished){
            MainActivity.displayFrame();
        }
    }

    public void draw(Canvas canvas){
        //draw something
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {

    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
}

public class MyThread extends Thread{
    private MyView myView;
    private SurfaceHolder surfaceHolder;
    private boolean running = false;
    private static Canvas canvas;

    public MyThread(SurfaceHolder surfaceHolder, MyView myView){
        super();
        this.surfaceHolder = surfaceHolder;
        this.myView = myView;
    }

    @Override
    public void run(){
        while(running){
            canvas = null;

            try {
                canvas = this.surfaceHolder.lockCanvas();
                synchronized (surfaceHolder) {
                    this.myView.update();
                    this.myView.draw(canvas);
                }
            } catch (Exception e) {e.printStackTrace();}
            finally{
                if(canvas!=null)
                {
                    try {
                        surfaceHolder.unlockCanvasAndPost(canvas);
                    }
                    catch(Exception e){e.printStackTrace();}
                }
            }
        }
    }

    public void setRunning(boolean running){
        this.running = running;
    }
}

Answer 1

最简单的方法是在视图中定义一个侦听器接口，并使活动实现它。然后，您可以通知活动游戏已结束并执行相应的逻辑。

{{1}}

Answer 2

public class MyView extends SurfaceView implements SurfaceHolder.Callback{
private MyThread myThread;
private boolean finished = false;
private Context context;

public MyView(Context context) {
    super(context);
    this.context=context;

    getHolder().addCallback(this);
    this.myThread = new MyThread(getHolder(), this);

    this.myThread.setRunning(true);
}

runOnUiThread(new Runnable(){
@Override
public void run(){
    update();
}
});

    public void update() {
    this.finished = someMethod();
    if(this.finished){
        MainActivity mainActivity = (MainActivity) context;
        mainActivity.displayFrame();
    }
}

public void draw(Canvas canvas){
    //draw something
}

@Override
public void surfaceCreated(SurfaceHolder holder) {

}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}
}

你能试试吗

android - 来自活动的调用方法

2 个答案: