Android Handler 定时任务

public class MainActivity extends AppCompatActivity {
private TextView tvTitle;

private Button btnClick;


@Override

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

setContentView(R.layout.activity_main);


tvTitle = (TextView) findViewById(R.id.tv_title);

btnClick = (Button) findViewById(R.id.btn_click);


btnClick.setOnClickListener(new View.OnClickListener() {
@Override

public void onClick(View v) {
Timer timer = new Timer();

timer.scheduleAtFixedRate(new MyTask(), 1, 500);

}
});


}
private class MyTask extends TimerTask {
@Override

public void run() {
Message message = new Message();

message.what = 1;

mHandler.sendMessage(message);


}
}
private Handler mHandler = new Handler(new Handler.Callback() {
@Override

public boolean handleMessage(Message msg) {
switch (msg.what) {
case 1:
tvTitle.setText(""+System.currentTimeMillis());

break;

}
return false;

}
});


}

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