Question

我在点击暂停按钮pauseb时使用两个线程只显示暂停文本我需要暂停线程直到再次点击按钮

handler1=new Handler();
      j=new Runnable(){
        public void run() {

            AbsoluteLayout.LayoutParams absParams =
                    (AbsoluteLayout.LayoutParams) b2.getLayoutParams();

            DisplayMetrics displaymetrics = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
            int width = displaymetrics.widthPixels;
            int height = displaymetrics.heightPixels;


            Random r = new Random();



            absParams.x = r.nextInt(width);
            absParams.y = r.nextInt(height);
            b2.setLayoutParams(absParams);
            Animation animation = AnimationUtils.loadAnimation(page2.this, R.anim.fade);
            b2.startAnimation(animation);
            handler1.postDelayed(j, 870);
        }};
    handler1.postDelayed(j, 50);





    final Button pauseb = (Button) findViewById(R.id.pauseid);
    pauseb.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (pause == false) {
                pauseb.setText("Pause");
                pause = true;

            }

                    else{

                    pauseb.setText("Play");
                    pause = false;
                }
                }

            });


            handler = new Handler();

            t = new Runnable() {
                public void run() {
                    Intent d = new Intent(getApplicationContext(), Page3.class);
                    d.putExtra("count", count);
                    d.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(d);


                }
            };

            handler.postDelayed(t, 8000);
        }

当单击暂停按钮时，线程正在工作8秒，它应该暂停整个活动直到重新开始

Answer 1

调用handler.removeCallbacks（j或t）删除j或t。

并调用handler.postDelayed（j或t，time）继续你的东西。

顺便说一句，Handler在你创建Handler的线程上运行Runnable。在你的情况下，它的UI线程。

Answer 2

使用布尔标志....

    boolean pause = false;
button2.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        customHandler.removeCallbacks(updateTimerThread);
        button.setVisibility(View.VISIBLE);

    pause = true;

    }
});
private Runnable updateTimerThread = new Runnable() {

int secs;

@Override
public void run() {
    // TODO Auto-generated method stub
    timeInMillisecond = SystemClock.uptimeMillis()- startTime;
    updatedTime = timeSwapBuff+timeInMillisecond;
    secs = (int)(updatedTime/1000);
    int mins = secs/60;
    secs = secs % 60;
    int milliseconds = (int)(updatedTime % 10000);
    textView.setText( String.format("%02d", secs));
    if(!pause)
        customHandler.postDelayed(this,1000);
    imageView1 = (ImageView)findViewById(R.id.imageView4);

}};

我需要在单击暂停按钮时暂停线程

2 个答案: