Develop Reference

Changing a variable from Notification Method

I added a notification feature to my app, when the user clicks on the notification it sends him to a certain activity in my app, but I also want it to change an integer variable number, I tried defining the variable static and do:
ActivityName.Variable = ActivityName.Variable + 1 or ActivityName.Variable++;
And it actually worked! but only when I change the date on my phone manually, so when the user sees the notification after waiting 1 day (the notification is daily) and clicks on it...he get to the activity but with no increase in the variable.
here's the notification codes:
public void setNotificationOn() { //This method sets the notification...so after 24h it will be triggered
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 24);
Intent intent = new Intent(getApplicationContext(), NotificationReceiverActivity.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(),
100, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
}
package com.example.wordspuzzlejsontest;
public class NotificationReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
LevelActivity.stars++; //This is the variable which I'm trying to increase
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent repeating_intent = new Intent(context, LevelsListActivity.class);
repeating_intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity
(context, 100, repeating_intent, PendingIntent.FLAG_CANCEL_CURRENT);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
.setContentIntent(pendingIntent)
.setSmallIcon(android.R.drawable.star_big_off)
.setContentTitle("Collect your daily star")
.setContentText("Click to collect your daily star")
.setAutoCancel(true)
.setColor(Color.BLUE);
notificationManager.notify(100, builder.build());
}
}

Want to write a code to only send notification at certain time, but somehow the alarmManager is not working and it shows some errors

Not sending notification at selected time, when I ran my code, directly showed notification
and showed error as well
Here is the error message: E/NotificationManager: notifyAsUser: tag=null, id=12345, user=UserHandle{0}
I thought the error message was due to Build.VERSION.SDK_INT, but after adding that, the error message is still there.
Place all of these under onCreate:
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 13);
calendar.set(Calendar.MINUTE,9)
;
Intent intent = new Intent ();
intent.setAction("com.example.Broadcast");
PendingIntent contentIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
// PendingIntent alarmIntent = PendingIntent.getBroadcast(this,0, intent,0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, contentIntent);
and here is the extend.
public class wakeReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
setNotification(context);
}
protected void setNotification(Context context){
PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
new Intent(context, MainActivity.class), 0);
String ChannelId = "12345";
int uniID = 12345;
NotificationCompat.Builder builder = new NotificationCompat.Builder(context,ChannelId )
.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle("Hi")
.setAutoCancel(true)
.setWhen(System.currentTimeMillis())
.setContentText("Please Rate.");
builder.setContentIntent(contentIntent);
//
// Send notification to your device
NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
builder.setChannelId("com.myApp");
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(
"com.myApp",
"My App",
NotificationManager.IMPORTANCE_DEFAULT
);
if (manager != null) {
manager.createNotificationChannel(channel);
}
}
manager.notify(uniID, builder.build());
}
}
Can someone please help me with this?

You are very confused.
In your code you call NotificationManager.notify(). This will show the Notification immediately.
You do:
Intent intent = new Intent(this, MainActivity.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(this,0, intent,0);
This won't work. You have created a PendingIntent which will be sent via broadcast using an Intent that is for an Activity! What do you want to happen? Do you want an Activity to be launched or do you want a BroadcastReceiver to be triggered?
I think what you want to do is as follows:
Create an Intent for a BroadcastReceiver, wrap that in a PendingIntent using getBroadcast() and pass that to the AlarmManager so that the broadcast Intent will be set at some future time.
Create a class that extends BroadcastReceiver. In onReceive() create the Notification and call NotificationManager.notify() to post the Notification. In the Notification you can set a PendingIntent that opens your Activity so that if the user clicks on the Notification your Activity will be launched. To do this, call PendingIntent.getActivity() and pass an Intent that contains MainActivity.class.

Notification doesn't appear android

I have a calendar library I grabbed off of github:
https://github.com/prolificinteractive/material-calendarview
And I'm having the user click on a date and add a reminder for that date, an alert dialog then pops up and asks them to enter the time they would like to be reminded on that day.
Now I was able to convert the text into a simpledate format and I spit it out into a string from a calendar object, so the date and time should be passing through the notification. But it doesn't seem to work anyways
Heres the code that sets the alarm:
Calendar cal = Calendar.getInstance();
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent notificationIntent = new Intent("android.media.action.DISPLAY_NOTIFICATION");
notificationIntent.addCategory("android.intent.category.DEFAULT");
PendingIntent broadcast = PendingIntent.getService(context, 100, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
try {
cal.setTime(alertFormatter.parse(date));
System.out.print("Date added successfully");
} catch (ParseException e) {
System.out.println("Failed to add date");
}
cal.add(Calendar.HOUR, Integer.parseInt(hour.getText().toString()));
cal.add(Calendar.MINUTE, Integer.parseInt(minute.getText().toString()));
cal.add(Calendar.SECOND, 0);
if(spAMpm.getSelectedItem().equals("AM"))cal.add(Calendar.AM_PM, Calendar.AM);
else if (spAMpm.getSelectedItem().equals("PM"))cal.add(Calendar.AM_PM, Calendar.PM);
alarmManager.setExact(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), broadcast);
Then the receiver I created to do what I need it to do:
public class UpcomingWorkNotification extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent notificationIntent = new Intent(context, UpcomingWork.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(UpcomingWork.class);
stackBuilder.addNextIntent(notificationIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Four.oh")
.setContentText("Assignment Due Soon!")
.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, builder.build());
}
}
In the manifest I gave it this permission and added the receiver
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<receiver android:name=".UpcomingWorkNotification">
<action android:name="android.media.action.DISPLAY_NOTIFICATION" />
<category android:name="android.intent.category.DEFAULT" />
</receiver>
Even with all that the notification still doesn't appear when I set it
Can anyone help?
And thank you

Android service control notifications in time doesn't work

I have a CalendarView that the user can touch and save school events.
I would check every day at 15:00 PM check if in the database there are some events saved like homeworks and generate a notification of that.
What i need for do this?
AlarmManager
BroadcastReceiver (??)
Service
The AlarmManager manage the when start a Service, and in the Service i make the query that if it returns something i make the notification.
I don't know if the BroadCastReceiver is needed.
It's all or i need something else?
Can someone tell me how do that?
Activity that manage the when case:
public class MainActivity extends ActionBarActivity {
private PendingIntent pendingIntent;
private AlarmManager alarmManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set the alarm to start at approximately 2:00 p.m.
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 16);
calendar.set(Calendar.MINUTE, 40);
Intent myIntent = new Intent(MainActivity.this, MyBroadcastReceiver.class);
pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent, 0);
alarmManager = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
// With setInexactRepeating(), you have to use one of the AlarmManager interval
// constants--in this case, AlarmManager.INTERVAL_DAY.
alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, pendingIntent);
}
}
My BroadcastReceiver
public class MyBroadcastReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent)
{
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "tag");
//Acquire the lock
wl.acquire();
Log.v("ADebugTag", "It work!");
int mId = 0;
//Show the notification here.
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_action_edit)
.setContentTitle("Diario Scolastico")
.setContentText("Hai dei compiti da svolgere per domani!");
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(context, MainActivity.class);
// The stack builder object will contain an artificial back stack for the
// started Activity.
// This ensures that navigating backward from the Activity leads out of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MainActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
mNotificationManager.notify(mId, mBuilder.build());
//Release the lock
wl.release();
}
}
Manifest Permissions
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
<receiver android:name=".MyBroadcastReceiver" />
Now i get notification but not in the established time and i don't know why!

The most appropriate use for your particular case would be the AlarmManager and a corresponding BroadcastReceiver as they were specifically created for situations like this. You don't need a service just for showing a notification.
Some problems that might lead to your issue that I saw by glancing at your code were:
alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);
should be:
//It's better to use the setInexactRepeating, but this is your call
int MILLIS_IN_A_DAY = 1000 * 60 * 60 * 24; //You can use an actual calculator so you don't have to compute it every time at runtime; also, lower it to something like 10000 ms to actually check if it is working
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), MILLIS_IN_A_DAY, pendingIntent);
Then you'd want to acquire the wakelock in your BroadcastReceiver onReceive method by doing so:
#Override
public void onReceive(Context context, Intent intent)
{
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, 'YOUR TAG');
//Acquire the lock
wl.acquire();
//You can show the notification here.
//Release the lock
wl.release();
}
Also, don't forget to register the BroadcastReceiver in your AndroidManifest.xml

How to know when a day was started in android?

Is there a way to detect when a day was started or date or time changes (not changed by user, it is changed by system). Any BroadCastReciever to do it? I am using service to run it by every hour, But drains battery.
My requirement is to check when the day has started (when time changes to 12 AM) or time changes (hourly) I want to display the notification.

Create alarm set on a specified time say 00 hours in your case, using AlarmManager and BroadcastReceiver. And you will receive a brodcast on every new day.
private void setAlarm(Calendar targetCal){
Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getBaseContext(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);
}
For further reference :
http://android-er.blogspot.in/2012/05/create-alarm-set-on-specified-time.html

or you can use ScheduledExecutorService to schedule and execute a task http://developer.android.com/reference/java/util/concurrent/ScheduledExecutorService.html

This is quite simple to do.
Step 1
Use the AlarmManager to fire up a BroadcastReceiver periodically..
private void showNotification() {
Intent alarmIntent = new Intent(this, NotificationReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 50000, pendingIntent);
}
Step 2
In the onReceive() do the checking when the time is 00 hours of the day, create a notification and show it.
public class NotificationReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Calendar now = GregorianCalendar.getInstance();
// This is where you check when you want to show the notification
if(now.get(Calendar.HOUR_OF_DAY) == 0){
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(context.getResources().getString(R.string.message_box_title))
.setContentText(context.getResources().getString(R.string.message_timesheet_not_up_to_date));
Intent resultIntent = new Intent(context, MainActivity.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(MainActivity.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, mBuilder.build());
}
}
}
Step 3
Do forgot to register the custom BroadcastReceiver is Manifest
<receiver
android:name="com.example.NotificationReceiver"
android:process=":remote" />