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 { @Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubSystem.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>

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