Question

我每隔5分钟安排一次报警管理器，它对我来说运行正常，但是当我重新启动设备时，警报管理器仅在每隔5分钟触发警报管理器后第一次触发。

在MainActivity中：

int DATA_FETCHER_RC = 123;

AlarmManager mAlarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, Receiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, DATA_FETCHER_RC, intent, PendingIntent.FLAG_UPDATE_CURRENT);

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());

int interval = 5 * 60 * 1000;
int hourOfDay = calendar.get(Calendar.HOUR_OF_DAY);
int minofday = calendar.get(Calendar.MINUTE);

calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
calendar.set(Calendar.MINUTE, minofday + 1);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND,0);

mAlarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);

在Receiver.Class中：

public class Receiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {  
        Toast.makeText(context, "Alaram Started", Toast.LENGTH_LONG).show();
    }
}

AndroidManifest.xml如下：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

<receiver android:name=".Receiver" android:enabled="true"  android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

Answer 1

使用以下代码创建启动接收器：

public class BootBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context pContext, Intent intent) {
    // Do your work related to alarm manager
}
}

在您的清单中，注册此广播接收器：

<receiver
android:name="com.yourapp.BootBroadcastReceiver"
android:enabled="true" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>

不要忘记在AndroidManifest.xml中添加权限：

<uses-permission 
android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

Answer 2

首先，您需要在清单中添加启动接收器和服务：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<receiver android:name=".Receiver"
    android:enabled="true"
    android:exported="false">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
</receiver>

<service
    android:name=".MyService"
    android:enabled="true"
    android:process=":service"
    android:exported="false"/>

实施服务和接收者：

public class MyService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        BroadcastReceiver receiver = new Receiver();
        IntentFilter filter = new IntentFilter(Intent.ACTION_BOOT_COMPLETED);
        registerReceiver(receiver, filter);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }
}

public class Receiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // receive
    }
}

在设备重启时重新启动警报服务

2 个答案: