Chronometer 计时器使用

 1 public class TestProject extends Activity {
 2     TextView textGoesHere;
 3     long startTime;
 4     long countUp;
 5 
 6     @Override
 7     public void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.main);
10 
11         Chronometer stopWatch = (Chronometer) findViewById(R.id.chrono);
12         startTime = SystemClock.elapsedRealtime();
13 
14         textGoesHere = (TextView) findViewById(R.id.textGoesHere);
15         stopWatch.setOnChronometerTickListener(new OnChronometerTickListener(){
16             @Override
17             public void onChronometerTick(Chronometer arg0) {
18                 countUp = (SystemClock.elapsedRealtime() - arg0.getBase()) / 1000;
19                 String asText = (countUp / 60) + ":" + (countUp % 60); 
20                 textGoesHere.setText(asText);
21             }
22         });
23         stopWatch.start();
24     }
25 }

<Chronometer android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/chrono"
    android:visibility="gone"/>