当为BOOT_COMPLETED时，在BroadcastReceiver中使用AlarmManager
当为BOOT_COMPLETED时，在BroadcastReceiver中使用AlarmManager
提问于 2013-03-05 18:20:47
我有一个服务"GroupsTaskAlarmChecker“，由AlarmManager在onCreate of Groups.class活动中每隔20秒调用一次，如下所示：
int seconds = 20;
Intent myIntent = new Intent(Groups.this, GroupsTaskAlarmChecker.class);
pendingIntent = PendingIntent.getService(Groups.this, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 10);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), seconds * 1000, pendingIntent);这个可以完美地工作。但我需要在设备启动时这样做。然后我知道我必须让AndroidManifest像这样：
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver android:name=".ReceiverBoot">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED">
<category android:name="android.intent.category.HOME">
</category></action></intent-filter>
</receiver>然后像这样的mi broadcastReceiver：
public class ReceiverBoot extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
int seconds = 20;
Intent myIntent = new Intent(context, GroupsTaskAlarmChecker.class);
pendingIntent = PendingIntent.getService(context, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 10);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), seconds * 1000, pendingIntent);
}
}但在这个onReceive中，我不知道如何才能像以前一样(使用intent和alarmManager每隔20秒启动一次服务)。该行错误：
AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);有没有可能我不能在BroadcastReceiver中创建AlarmManager？
我感谢大家，我是一个机器人乞讨者，我需要你们的帮助。我的英语很抱歉;)
回答 4
Stack Overflow用户
回答已采纳
发布于 2013-03-06 00:11:13
ALARM_SERVICE既没有在类ReceiverBoot中定义，也没有在BroadcastReceiver中定义。
您应该引用Context.ALARM_SERVICE作为getSystemService(String)的参数。
Stack Overflow用户
发布于 2013-08-06 20:42:43
总结上面的答案和注释: onReceive处理程序接收可用于访问getSystemService和ALARM_SERVICE的上下文。示例代码：
public class MyReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// Start periodic service.
Calendar cal = Calendar.getInstance();
Intent srvIntent = new Intent(context, MyService.class);
PendingIntent pIntent = PendingIntent.getService(context, 0, srvIntent, 0);
// Use context argument to access service
AlarmManager alarm =
(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
// Repeat every 5 seconds
alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
5000, pIntent);
}
}
}使用此代码创建一个新类，当然，将MyReceiver和MyService更改为实现中的名称。
Stack Overflow用户
发布于 2016-12-06 09:20:45
这里有一点贡献，我相信它可以为实现这个问题的目标添加一个更完整的愿景。
First：在你的应用程序的AndroidManifest内部配置一个“接收器”。
<receiver
android:name=".AlarmBroadcastReceiver"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>Second：使用扩展抽象类BroadcastReceiver的类，您应该确定意图操作是否为"BOOT_COMPLETED“。如果满足条件，您可以从您的类中调用一个方法，该方法具有对您的警报的所有构造。
请看下面的代码片段。
public class AlarmBroadcastReceiver extends BroadcastReceiver {
String TAG = "ALARMS";
String CLASS = this.getClass().getSimpleName() + ": ";
Context alarmContext;
@Override
public void onReceive(final Context context, Intent intent) {
Log.d(TAG, CLASS + "[START] onReceive()... ");
alarmContext = context;
if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
Log.d(TAG, CLASS + "BOOT_COMPLETED action has been received.");
setAlarmOnBoot();
}
Log.d(TAG, CLASS + "[END] onReceive()... ");
}
public void setAlarmOnBoot() {
Log.d(TAG, CLASS + "[START] - setAlarmOnBoot()");
final long beginAt = SystemClock.elapsedRealtime() + 60 * 1000;
final long interval = 300000; // 5 minutes
try {
AlarmManager alarm = (AlarmManager) alarmContext.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(alarmContext, AlarmBroadcastReceiver.class);
PendingIntent pIntent = PendingIntent.getService(alarmContext, 0, intent, 0);
alarm.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, beginAt, interval, pIntent);
Log.d(TAG, CLASS + "the Alarm has been configured successfully (5 minutes) of interval.");
} catch (Exception e) {
Log.d(TAG, CLASS + "an exception has ocurred while setting the Alarm...");
e.printStackTrace();
}
Log.d(TAG, CLASS + "[END] - setAlarmOnBoot()");
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15221295
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