is it right way to set alarm at every 30 seconds ???

问题

I need to start alarm at every 30 seconds, I need it to be activated without running the app. But whether the app runs or not the AlarmReceiver do not get called. Any suggestions? start method is in MainActivity.java class

 public void start() {
    Calendar calendar=Calendar.getInstance();
    calendar.add(Calendar.SECOND, 30);
    Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
    PendingIntent pintent = PendingIntent.getService(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarm.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pintent);
    Log.d("alarm","alarm set for alarm receiver");
}

My Receiver file

public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
   // Toast.makeText(context,"Alarm Receiver ",Toast.LENGTH_SHORT).show();
    Log.d("Alarm","Alarm receive");

}

}

Manifest File:

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"

    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity" android:configChanges="keyboardHidden|orientation|screenSize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name=".GetLocationService"/>
    <receiver android:name=".AlarmReceiver" android:enabled="true"/>
</application>

here i am able to set alarm, but i didn't receive alarm

回答1:

In this page there is a finished example of what you need:

https://www.thepolyglotdeveloper.com/2014/10/use-broadcast-receiver-background-services-android/

Apparently you have to change the line:

PendingIntent pintent = PendingIntent.getService(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

PendingIntent pintent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

Change your start method to this:

public void start() {
    Intent alarmIntent = new Intent(this, AlarmReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
    AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    int interval = 30 * 1000; // 30 seconds of interval.
    manager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
    Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
}

Let me know if works.

来源：https://stackoverflow.com/questions/42180984/is-it-right-way-to-set-alarm-at-every-30-seconds

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android