Develop Reference

How to trigger a launch Activity intent when my app is closed on Android 10/Q?

I am trying to create an app that will open another app at a specified time. To do this, I used an AlarmManager that starts a service. It works just fine if my app is open when the alarm is triggered. I get a notification that the service started, and the other app opens. However, if my app is in the background (after pressing the home button), and the alarm triggers, I get a notification that the service started, but the other app does not launch. What am I doing wrong? I am testing this on a Pixel 3 emulator running API level 29 (Android 10/Q).
MainActivity.java
public class MainActivity extends AppCompatActivity {
public static final int REQUEST_CODE=101;
public static int aHour;
public static int aMinute;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void setAlarm() {
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
Intent intent = new Intent(this, amReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, aHour);
calendar.set(Calendar.MINUTE, aMinute);
am.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
}
//Some code that sets aHour and aMinute
//Some code that triggers setAlarm()
}
amReciever.java
public class amReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent i = new Intent(context, launcherService.class);
ContextCompat.startForegroundService(getApplicationContext(), i);
}
}
launcherService.java
public class launcherService extends Service {
public static final String CHANNEL_ID = "ForegroundServiceChannel";
#Override
public void onCreate() {
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
createNotificationChannel();
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("Foreground Service")
.setContentText("App is launching.")
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentIntent(pendingIntent)
.build();
startForeground(1, notification);
Intent launcher = getApplicationContext().getPackageManager().getLaunchIntentForPackage("com.example.app");
if (launcher != null) {
startActivity(launcher);
}
return START_NOT_STICKY;
}
#Override
public IBinder onBind(Intent intent) {
return null;
}
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel serviceChannel = new NotificationChannel(
CHANNEL_ID,
"Foreground Service Channel",
NotificationManager.IMPORTANCE_DEFAULT
);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(serviceChannel);
}
}
}
AndroidManifest.xml
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
<service android:name=".launcherService"
android:enabled="true"
android:exported="true" />

As of Android 10 (API level 29), you cannot start activities from the background anymore.
There are a number of exceptions to this rule that may or may not apply to your given scenario.
If none of the exceptions apply, you might want to consider displaying a high-priority notification, possibly with a full-screen Intent.

Alarm Doesn't work when app is closed

Basically, I am trying to build an alarm app which has some buttons with some predefined Date and Time. I have tried using AlarmManager and broadcast receiver in the first place but didn't work. So, I used foreground service with alarmManager but still, the alarm doesn't fire when the app is destroyed. I am a newbie. I tried searching the internet but I had no luck. Hope there is a lot of people here to help me out. Thanks in Advance.
Here I am just trying to set only one alarm for testing. Otherwise, I am using a variable as request code for multiple alarms.
AndroidManifest.xml
<receiver android:name=".AlarmReceiver" />
<activity
android:name=".Activity.PlayerDetailsActivity"
android:theme="#style/AppTheme.NoActionBar"></activity>
<activity android:name=".Activity.FixtureActivity" />
<service android:name=".MyService"/>
MyService.java
public class MyService extends Service {
public MyService() {
}
#Override
public IBinder onBind(Intent intent) {
// TODO: Return the communication channel to the service.
throw new UnsupportedOperationException("Not yet implemented");
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Started", Toast.LENGTH_SHORT).show();
Log.e("service","service");
long longExtra = intent.getLongExtra(Constants.ALARM_TIME, 0000);
//Testing Area Start
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(longExtra);
int mMin = calendar.get(Calendar.MINUTE);
int mMonth = calendar.get(Calendar.MONTH);
int mDay = calendar.get(Calendar.DAY_OF_MONTH);
int mHour = calendar.get(Calendar.HOUR_OF_DAY);
Log.e("hour min month day"," "+mHour + " : "+mMin+" month : "+mMonth+" "+" Date : "+mDay+" ");
String currentDateTime=getDeviceDateTime();
Log.e("CurrentdateTime",""+currentDateTime);
Log.e("longExtra",""+longExtra);
//Testing Area End
String CHANNEL_ID = "my_channel_01";
NotificationChannel channel = null;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
channel = new NotificationChannel(CHANNEL_ID,
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT);
((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("dfdf")
.setSmallIcon(R.drawable.ic_notifications_black_24dp)
.setContentText("dfdfd").build();
startForeground(3, notification);
}
/*Intent alertIntent = new Intent(getApplicationContext(), AlarmReceiver.class);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Log.d("I",""+longExtra);
alarmManager.set(AlarmManager.RTC_WAKEUP, 6000000, PendingIntent.getBroadcast(getApplicationContext(), 0, alertIntent,
PendingIntent.FLAG_ONE_SHOT));*/
AlarmManager manager= (AlarmManager)getSystemService(ALARM_SERVICE);
Intent myIntent;
myIntent = new Intent(getApplicationContext(),AlarmReceiver.class);
myIntent.putExtra("check",true);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,myIntent,0);
Long finalTime =longExtra-System.currentTimeMillis();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
manager.setExact(AlarmManager.RTC_WAKEUP,longExtra,pendingIntent);
}
else
manager.set(AlarmManager.RTC_WAKEUP,longExtra,pendingIntent);
return START_NOT_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
}
}
Alarmreceiver.java
public class AlarmReceiver extends BroadcastReceiver
{
public static final String CHANNEL_ID = "47";
#Override
public void onReceive(Context context, Intent intent)
{
intent = new Intent(context, SplashActivity.class);
intent.putExtra("not",true);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationCompat = new NotificationCompat.Builder(context,CHANNEL_ID);
notificationCompat.setSmallIcon(R.drawable.ic_notifications_black_24dp);
notificationCompat.setContentTitle("My Noticiation");
notificationCompat.setContentText(getPreferences(context).getDateTime());
notificationCompat.setContentIntent(pendingIntent);
notificationCompat.setSound(alarmSound);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "channel name", importance);
// Register the channel with the system; you can't change the importance
// or other notification behaviors after this
NotificationManager notificationManager = context.getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
Notification notification = notificationCompat.build();
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
notificationManager.notify(100,notification);
Toast.makeText(context, "Alarm Working", Toast.LENGTH_SHORT).show();
}
}

you have to start your service so then it can set alarm and fire reciever
start it like this from your activity class
Intent intent=new Intent(this,MyService.class);
startService(intent);

Consider using JobScheduler as a persistence mechanism. It is wakeful and handles the wake locks for you. Only downside it's for Android SDK >= 21 (Lollipop).
There's also a new friend in town that does the backward compatibility for you: WorkManager and will work with all version of Android, even below Lollipop.

Intent myIntent;
myIntent = new Intent(this, AlarmReceiver.class);
myIntent.putExtra("check",true);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, myIntent, 0);
=============================
Would you change your above code like this ?
Intent myIntent;
myIntent = new Intent(this , MyService.class);
myIntent.setAction("REQUEST_FROM_ALARM_MANAGER");
PendingIntent pendingIntent = PendingIntent.getForegroundService(this,0,myIntent,0);
====================================================
And Service class
#RequiresApi(api = Build.VERSION_CODES.O)
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
mContext = this;
Log.e(TAG, "onStartCommand " + intent);
if(intent == null) {
return START_NOT_STICKY;
}
if("REQUEST_FROM_ALARM_MANAGER".equals(intent.getAction())){
// show Notification here for your foreground service
}
return START_NOT_STICKY;
}

You have to start a service that survive to your app, you can see here how to do it

Non activity class notification not working

I'm trying to make a notification appear in the notification manager from a non activity class, but I can't make it happen
public void showNotification(Context context) {
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
//.setSmallIcon(R.drawable.notif1)
.setContentTitle("Car crash occure!")
.setContentText("Tap to view location.");
PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
new Intent(context, MapsActivity.class), 0);
mBuilder.setContentIntent(contentIntent);
mBuilder.setDefaults(Notification.DEFAULT_SOUND);
mBuilder.setAutoCancel(true);
NotificationManager mNotificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(0, mBuilder.build());
}

Use Intent Service instead of Activity
public static class NotificationActionService extends IntentService {
public NotificationActionService() {
super(NotificationActionService.class.getSimpleName());
}
#Override
protected void onHandleIntent(Intent intent) {
String action = intent.getAction();
if (ACTION_1.equals(action)) {
Log.d("ACTION_NOTIFICATION", "Notification Clicked");
}
// TODO: handle action 1.
// If you want to cancel the notification: NotificationManagerCompat.from(this).cancel(NOTIFICATION_ID);
}
}

Send a notification with android at an interval

I'm trying to set a notification to appear after a certain interval. I expected this to work however nothing seems to happen when running the code on my phone other than at reciever being printed to the console and I can't seem to find out why. Any help would be greatly appreciated.
Here is the code used to set the alarm.
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.SECOND, 10);
Intent intent = new Intent(getApplicationContext(), NotificationReciever.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_FIFTEEN_MINUTES, pendingIn
Here is the notification receiver class
public class NotificationReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
System.out.println("at reciever");
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent repeatingIntent = new Intent(context, LoginActivity.class);
repeatingIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 100, repeatingIntent, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
.setContentIntent(pendingIntent)
.setContentTitle("Please Leave at the cage")
.setContentText("It almost 5")
.setAutoCancel(true);
notificationManager.notify(100, builder.build());
}
}
Here are the relevant manifest lines
receiver android:name=".NotificationReciever"
uses-permission android:name="com.android.alarm.permission.SET_ALARM"

Basically you need to set a icon for each notifications.
NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
.setContentIntent(pendingIntent)
.setContentTitle("Please Leave at the cage")
.setSmallIcon(R.drawable.crosshair); //crosshair is the icon choice in this example
.setContentText("It almost 5")
.setAutoCancel(true);

The notification can't skip to another activity?

my code is
public class AlarmReceiver extends BroadcastReceiver {
public Notification mNotification = null;
public NotificationManager mNotificationManager = null;
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "time up！", Toast.LENGTH_SHORT).show();
mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotification = new Notification(R.drawable.icon, "tip！",
System.currentTimeMillis());
mNotification.contentView = new RemoteViews(context.getPackageName(),
R.layout.notification);
mNotification.contentView.setTextViewText(R.id.tv_tip, "click to see the description");
Intent notificationIntent = new Intent(context,NotificationTip.class);
notificationIntent.putExtra("description", intent.getStringExtra("description")) ;
//notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
notificationIntent, 0);
mNotification.contentIntent = contentIntent;
mNotificationManager.notify(0, mNotification);
}
}
While when I click the item in notification ,I can't get to NotificationTip activity,so what's wrong with this code?

following line
Intent notificationIntent = new Intent(context,NotificationTip.class);
needs to be
Intent notificationIntent = new Intent("X");
Where X is the intent action name. this you have to add as intent filter in your android manifest file.