Android定时器的使用,

今天在做Android手机屏幕加锁的功能时，即只有解锁才能进入我的手机，没有解锁是不能进入手机，我做了一个定时器定时去唤醒我的解锁界面，下面是demo

package com.gfive.test;import java.util.Calendar;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class TimerDemo extends Activity {/** Called when the activity is first created. */private Button mButton;private TextView tv;private final int UPDATE_TEXT = 1;private Timer mTimer;private TimerTask mTimerTask;private Handler mHandler;private int i = 0;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);tv = (TextView) findViewById(R.id.tvShow);mButton = (Button) findViewById(R.id.btn_time);mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case UPDATE_TEXT:Calendar calendar = Calendar.getInstance();mButton.setText("CurrentTime" + calendar.getTime());tv.setText("数据:"+i++);if(i > 10){TimerDemo.this.startActivity(new Intent(TimerDemo.this,TimerDemo.class));}break;default:break;}}};mTimer = new Timer();mTimerTask = new TimerTask() {@Overridepublic void run() {mHandler.sendEmptyMessage(UPDATE_TEXT);}};mTimer.schedule(mTimerTask, 0, 1000);}}