android 定时启动\取消

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        Intent intent = new Intent("cn.pocketdigi.update.alarm");        intent.setClass(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, System.currentTimeMillis()+3500, pi);//只执行一次                am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+3500, 10000, pi); //重复执行

       <receiver android:name=".AlarmReceiver">             <intent-filter>                <action android:name="cn.pocketdigi.update.alarm" />            </intent-filter>        </receiver>

public class AlarmReceiver extends BroadcastReceiver {private static final String TAG = "AlarmReceiver";@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubLog.v(TAG, "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}}

取消方式：

        Intent intent = new Intent("cn.pocketdigi.update.alarm");        intent.setClass(this, AlarmReceiver.class);         PendingIntent pi=PendingIntent.getBroadcast(this, 0, intent,0);        AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);        alarm.cancel(pi);

另外一种intent方式

代码     Intent intent =new Intent(Main.this, alarmreceiver.class);    intent.setAction("repeating");    PendingIntent sender=PendingIntent        .getBroadcast(Main.this, 0, intent, 0);        //开始时间    long firstime=SystemClock.elapsedRealtime();    AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);　　//5秒一个周期，不停的发送广播    am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP            , firstime, 5*1000, sender);