My app requires that a notification be sent twice a day. For testing purposes, I have shortened this time to 1 hour. This, of course, must be done in the background/when app is closed, so I have already tried AlarmManager and that did not work. I have therefore switched to WorkManager. someone suggested that I use periodicWork to accomplish my task but here is the issue: WorkManager only executes all periodic work when the app is open Another weird thing: If I leave the app alone for 3 hours, I will get way more than three notifications when I open the app.
I know for a fact that WorkManager is not executing because I have instantiated a Date Object whenever doWork() is called, and that timestamp from the date object is printed to the notification. This printed time will ALWAYS show as the time I have opened the app, meaning all of the queued work requests were executed at once when I opened the app.
Here is what is used to set the alarm. Note that cancelAlarm() does not cancel the alarm, but rather resets a shared preference I used for debugging
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enter);
ToggleButton toggle = findViewById(R.id.toggleButton);
toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked) {
setAlarm();
} else {
cancelAlarm();
}
}
});
}
private void setAlarm() {
Constraints constraints = Constraints.NONE;
PeriodicWorkRequest testRequest = new PeriodicWorkRequest.Builder(ReminderWorker.class, 1, TimeUnit.HOURS)
.setConstraints(constraints)
.build();
WorkManager.getInstance().enqueueUniquePeriodicWork("ReminderWork", ExistingPeriodicWorkPolicy.KEEP, testRequest);
}
private void cancelAlarm() {
SharedPreferences savedSharedPreferences = getApplicationContext().getSharedPreferences("USER_PREFERENCES", Context.MODE_PRIVATE);
final SharedPreferences.Editor editor = savedSharedPreferences.edit();
editor.putInt("Test", 0);
editor.commit();
}
Here is the actual ReminderWorker class, I put a SHaredPreference variable to check the amount of times the worker fired, and a Date objectto check the time fired. These are printed in the notification.
public class ReminderWorker extends Worker {
int i;
public final String CHANNEL_ID = "MainChannel";
public ReminderWorker(@NonNull Context context, @NonNull WorkerParameters params) {
super(context, params);
}
@NonNull
@Override
public Result doWork() {
Date date = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(date);
SharedPreferences savedSharedPreferences = getApplicationContext().getSharedPreferences("USER_PREFERENCES", Context.MODE_PRIVATE);
final SharedPreferences.Editor editor = savedSharedPreferences.edit();
i = savedSharedPreferences.getInt("Test", 0) + 1;
editor.putInt("Test", i);
editor.commit();
createNotificationChannel();
buildNotification(cal);
return Result.success();
}
private void createNotificationChannel() {
String name = "Birthday Notifications";
String description = "Reminds you when your friends birthday approaches";
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
channel.setDescription(description);
NotificationManager notificationManager = getApplicationContext().getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
private void buildNotification(Calendar cal) {
Context context = getApplicationContext();
Intent openTap = new Intent(context, EnterActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, openTap, 0);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID);
builder.setSmallIcon(R.drawable.pix_cake);
builder.setContentTitle("TestNotification");
builder.setStyle(new NotificationCompat.BigTextStyle()
.bigText("TestText" + i + " Time: " + cal.get(Calendar.HOUR) + ":" + cal.get(Calendar.MINUTE)));
builder.setPriority(NotificationCompat.PRIORITY_MAX);
builder.setContentIntent(pendingIntent);
builder.setAutoCancel(true);
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
notificationManager.notify(i, builder.build());
//notificationManager.cancelAll();
}
}
In case it is needed, here is my AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp">
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.SET_ALARM" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<application
android:allowBackup="true"
android:icon="@mipmap/main_icon"
android:label="@string/app_name"
android:roundIcon="@mipmap/main_icon_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".ListOfDaysActivity" />
<activity android:name=".MainActivity" />
<activity android:name=".EnterActivity"
android:launchMode="singleInstance">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
No errors thrown, just not the result expected. I need a notification to show up roughly every hour but that simply isn't happening.Any way around this?
