Android 定时执行任务

本程序执行效果为：
隔3秒打印"收到广播"

package com.example.timingtest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class AlarmReceiver extends BroadcastReceiver {
 
	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		System.out.println("收到广播");
	}
}

package com.example.timingtest;

import java.util.Calendar;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Calendar c=Calendar.getInstance();
 
        Intent intent=new Intent(this,AlarmReceiver.class);
        PendingIntent pi=PendingIntent.getBroadcast(this, 0, intent,0);
        //设置一个PendingIntent对象，发送广播
        AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);
        //获取AlarmManager对象
        am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);
 
        //时间到时，执行PendingIntent，只执行一次
        //AlarmManager.RTC_WAKEUP休眠时会运行，如果是AlarmManager.RTC,在休眠时不会运行
        am.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), 3000, pi);
        //如果需要重复执行，使用上面一行的setRepeating方法，倒数第二参数为间隔时间,单位为毫秒
 
    }
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.timingtest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".AlarmReceiver" android:process=".abc"/>
    </application>

</manifest>