textView即时递增 Timer handler的使用

mTextView = (TextView)findViewById(R.id.text); 
 
Timer timer = new Timer(); 
IncrementTask task = new IncrementTask(mTextView); 
timer.scheduleAtFixedRate(task, 0, 1000); 

 

class IncrementTask extends TimerTask { 
    WeakReference<TextView> mRef; 
    int counter = 0; 
    Handler handler = new Handler(); 
 
    public IncrementTask(TextView text) { 
        mRef = new WeakReference<TextView>(text); 
    } 
 
    public void run() { 
        handler.post(new Runnable() { 
            public void run() { 
                mRef.get().setText("counter " + counter); 
                counter++; 
            } 
        }); 
    } 
}