Android 定时执行任务 AlarmManager的使用（可用于闹钟开发）

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package com.pocketdigi.alarm;
 
import java.util.Calendar;
 
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
 
public class AlarmActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Calendar c=Calendar.getInstance();
 
c.set(Calendar.YEAR,2011);
c.set(Calendar.MONTH,Calendar.JUNE);//也可以填数字，0-11,一月为0
c.set(Calendar.DAY_OF_MONTH, 28);
c.set(Calendar.HOUR_OF_DAY, 19);
c.set(Calendar.MINUTE, 50);
c.set(Calendar.SECOND, 0);
//设定时间为 2011年6月28日19点50分0秒
//c.set(2011, 05,28, 19,50, 0);
//也可以写在一行里
 
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(), 10000, 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
 
}
}

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package com.pocketdigi.alarm;
 
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");
Intent it=new Intent(context,AlarmActivity.class);
it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(it);
//收到广播后启动Activity,简单起见，直接就跳到了设置alarm的Activity
//intent必须加上Intent.FLAG_ACTIVITY_NEW_TASK flag
}
}

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.pocketdigi.alarm"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
 
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AlarmActivity"
android:label="@string/app_name">
<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>