如何在Android上绘制下一个东西之前暂停5秒？

Question

假设我想画一条线，然后等待五秒钟，然后再画另一条线。我有一个这样的方法：

    public void onDraw(Canvas canvas) {
        int w = canvas.getWidth();
        int h = canvas.getHeight();
        canvas.drawLine(w/2, 0, w/2, h-1, paint);
        // PAUSE FIVE SECONDS
        canvas.drawLine(0, h/2, w-1, h/2, paint);
    }

如何暂停？

Answer 1

您可以使用这样的 CountDownTimer ：

public void onDraw(Canvas canvas) {
        int w = canvas.getWidth();
        int h = canvas.getHeight();
        canvas.drawLine(w/2, 0, w/2, h-1, paint);
        // PAUSE FIVE SECONDS
        new CountDownTimer(5000,1000){

            @Override
            public void onTick(long miliseconds){}

            @Override
            public void onFinish(){
               //after 5 seconds draw the second line
               canvas.drawLine(0, h/2, w-1, h/2, paint);
            }
        }.start();

    }

问候，

Answer 2

不要在 UI 线程中调用 onDraw 方法中等待，否则您将阻止它。使用标志来处理将绘制哪条线

boolean shouldDrawSecondLine = false;

public void setDrawSecondLine(boolean flag) {
    shouldDrawSecondLine = flag;
}

public void onDraw(Canvas canvas) {
    int w = canvas.getWidth();
    int h = canvas.getHeight();
    canvas.drawLine(w/2, 0, w/2, h-1, paint);
    if (shouldDrawSecondLine) {
        canvas.drawLine(0, h/2, w-1, h/2, paint);
    }
}

而不是像这样在代码中使用它

final View view;
// initialize the instance to your view
// when it's drawn the second line will not be drawn

// start async task to wait for 5 second that update the view
AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() {
    @Override
    protected Void doInBackground(Void... params) {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        view.setDrawSecondLine(true);
        view.invalidate();
        // invalidate cause your view to be redrawn it should be called in the UI thread        
    }
};
task.execute((Void[])null);

Answer 3

嗯...您可以在（这将在其他方法中）设置一个标志，并在您的 onDraw() 中根据该标志的值绘制该线。

即也许类似（虽然我不确定为什么你需要暂停）

invalidate();
pause/sleep();
//set flag
invalidate();

Answer 4

使用 Thread.sleep(5000) 就可以了。