安卓：AlarmManager无法启动 [英] Android : AlarmManager not start

问题描述

我必须创建一个AlarmManager每秒钟重复，我用这个code

I must create an AlarmManager that repeating every seconds, I use this code

Intent in = new Intent(context,Tempo_Indietro.class);
in.putExtra("id_widget", appWidgetIds[i]);
PendingIntent pi = PendingIntent.getActivity(context, 0, in, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarm = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000, pi);

但它不启动...为什么？

but it don't start...why ??

推荐答案

要开始已安排的活动：你可以使用这样的：

To start a Scheduled Activity: you can use like:

第一步：设置AlarmManager

Step1: Setting for AlarmManager

    Intent intent =new Intent(context,AlarmReceiver.class);

    PendingIntent pi = PendingIntent.getBroadcast(context, 0, in, PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
    am.setRepeating(AlarmManger.RTC_WAKEUP,System.currentTimeMillis(), 1000, pi);

第二步：创建一个BroadcastReceiver

Step2: creating a BroadcastReceiver

public class AlarmReceiver extends BroadcastReceiver {

 //override onReceive(Context, Intent) method
 @Override public void onReceive(Context context, Intent intent)
 {
 //.........
    Intent i = new Intent(context,Tempo_Indietro.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
//..........  
 }

}

请注意：不要忘了，包括新创建的活动，接收器在AndroidManifest.xml文件

Note: Don’t forget to include the newly created activity, receiver in the AndroidManifest.xml file.

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