I have searched a lot of places but couldn't find a solution. I'm new to Android/Java programming and I'm trying to make an app that saves a counter in SQLite database from SharedPreferences daily (exact time) and reset it to 0 (like a step counter).
I'm using AlarmManager and BroadcastReceiver.
I'm setting the alarm using "setExactAndAllowWhileIdle" in one of the activities for first time, then onReceive() of BroadcastReceiver I'm calling a restartAlarm() method to reschedule the alarm.
The problem
Alarm triggers correctly for first time at specific time (e.g. 14:00:00).
Also rescheduled and triggered correctly after 3 minutes (14:03:00), but only once.
The problem I'm facing is that after rescheduled alarm triggers for first time after 3 minutes (from restartAlarm() method in BroadcastReceiver), then the alarm triggers every 5 seconds and not 3 minutes (I want daily repeating alarm but I'm setting alarm every 3 minutes only for testing results).
This is what I'm doing:
I'm setting permission and receiver in Manifest.xml file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:name=".ApplicationClass"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
....
<receiver
android:name=".MyAlarmReceiver"
android:directBootAware="true"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
Starting the alarm in one of app's activities:
public class CompleteRegistered extends AppCompatActivity {
...
public static AlarmManager alarmManager;
public static PendingIntent pendingIntent;
private static final int GLASS_REQUEST_CODE = 101;
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_complete_registered);
...
startAlarmManager();
}
private void startAlarmManager(){
// Creating the pending intent to send to the BroadcastReceiver
alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent alarmIntent = new Intent(getApplicationContext(), MyAlarmReceiver.class);
pendingIntent = PendingIntent.getBroadcast(this, GLASS_REQUEST_CODE, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
// Setting the specific time for the alarm manager to trigger the intent
Calendar startTime = Calendar.getInstance();
startTime.setTimeInMillis(System.currentTimeMillis());
startTime.set(Calendar.HOUR_OF_DAY, 14);
startTime.set(Calendar.MINUTE, 0);
startTime.set(Calendar.SECOND, 0);
// Starts the alarm manager
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
}
}
Saving counter to SQLite database and rescheduling alarm in BroadcastReceiver:
public class MyAlarmReceiver extends BroadcastReceiver {
private static final String MyPREFERENCES = "MyPrefs" ;
private SharedPreferences sharedpreferences;
public static AlarmManager alarmManager;
public static PendingIntent pendingIntent;
public static Intent alarmIntent;
private static final int GLASS_REQUEST_CODE = 102;
// Database Helper
private DatabaseHelper db;
public void restartAlarm(Context context){
// Creating the pending intent to send to the BroadcastReceiver
alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmIntent = new Intent(context, MyAlarmReceiver.class);
pendingIntent = PendingIntent.getBroadcast(context, GLASS_REQUEST_CODE, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
// Setting the specific time for the alarm manager to trigger the intent
Calendar startTime = Calendar.getInstance();
startTime.setTimeInMillis(System.currentTimeMillis());
startTime.set(Calendar.HOUR_OF_DAY, 14);
startTime.set(Calendar.MINUTE, 0);
startTime.set(Calendar.SECOND, 0);
// Getting time
Calendar now = Calendar.getInstance();
if (now.after(startTime)){
// startTime.add(Calendar.DATE, 1);
startTime.add(Calendar.MINUTE, 3);
}
// Starts the alarm manager
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC, startTime.getTimeInMillis(), pendingIntent);
}
}
@Override
public void onReceive(Context context, Intent intent) {
// When device reboots
if (intent.getAction() == Intent.ACTION_BOOT_COMPLETED) {
// Set the alarm.
startAlarm(context);
}
else {
sharedpreferences = context.getSharedPreferences(MyPREFERENCES, Activity.MODE_PRIVATE);
final SharedPreferences.Editor editor = sharedpreferences.edit();
// Get glasses from SharedPreferences
int glassCounter = sharedpreferences.getInt("glasses", 0);
// Create a WaterTracker
WaterTracker waterTracker = new WaterTracker();
waterTracker.setGlasses(glassCounter);
// Store to SQLite database
db = new DatabaseHelper(context);
db.createWaterTracker(waterTracker);
// Reset glasses from SharedPreferences
editor.putInt("glasses", 0);
editor.apply();
// Set the alarm again.
restartAlarm(context);
}
}
Also I have an ApplicationClass that extends Application:
public class ApplicationClass extends Application {
...
public static AlarmManager alarmManager;
public static PendingIntent pendingIntent;
private static final int GLASS_REQUEST_CODE = 101;
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onCreate() {
super.onCreate();
...
ComponentName receiver = new ComponentName(getApplicationContext(), MyAlarmReceiver.class);
PackageManager pm = getApplicationContext().getPackageManager();
pm.setComponentEnabledSetting(receiver,
PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
PackageManager.DONT_KILL_APP);
}
}
The results I'm getting from this code are:
1. (counter value) at 14:00:00
2. (counter value) at 14:03:00
3. (counter value) at 14:03:05
4. (counter value) at 14:03:10
5. (counter value) at 14:03:15
6. (counter value) at 14:03:20
7. (counter value) at 14:03:25
8. (counter value) at 14:03:30
...
?. (counter value) at 14:05:25
Any help with this would be much appreciated!
Thank you in advance!
