Develop Reference

How to add short cut of my app in my app's widget menu

I want to add my app's shortcut into my app's widget menu. how to add it?
I can't find a solution for this, maybe my searching key is wrong.
Can anyone help me?

In order to bind click listener to any icon shown on your widget header, you can do it by following:
Add these codes in onUpdate() method of your widget provider:
// Create an intent
Intent openMyAppIntent= new Intent(context, ActivityToBeOpened.class);
// Create pending intent with intent created above
PendingIntent openMyAppPendingIntent= PendingIntent.getActivity(context, 1, openMyAppIntent, 0);
// Bind pending intent with your remote view OnClickPendingIntent method
remoteView.setOnClickPendingIntent(R.id.app_icon_on_widget, openMyAppPendingIntent);

Resume activity from a android tv recommendation

I have some troubles with the management of recommendations (notifications) on an Android TV with the Leanback Launcher.
I use the google sample here to implement my own : https://github.com/googlesamples/androidtv-Leanback
Expected result :
I'm on my activity "MainActivity" (with a webview)
I press HOME, so I'm on the Leanback launcher with recommendation include mines.
I press on one of them
Resume activity "MainActivity" without recreate it with a new Intent with a new extra.
Actually, The resume of the activity without reload the activity works fine, below the creation of the PendingIntent :
private PendingIntent buildPendingIntent(Parcelable media, int id) {
Intent detailsIntent = new Intent(this, MainActivity.class);
detailsIntent.putExtra("media", media);
detailsIntent.putExtra("id", id);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
stackBuilder.addParentStack(MainActivity.class);
stackBuilder.addNextIntent(detailsIntent);
return stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
}
Current result :
I'm on my activity "MainActivity" (with a webview)
I press HOME, so I'm on the Leanback launcher with recommendation include mines.
I press on one of them
My activity receive "onNewIntent" event by in the extrat intent values I have always the same media.
This solution doesn't work, because Google said in a comment of the sample code :
// Ensure a unique PendingIntents, otherwise all recommendations end up with the same
// PendingIntent
detailsIntent.setAction(movie.getId());
So to differentiate all recommandations, I have to set Action with an ID, else, it will be always the last pendingintent sent to my activity. It's my current behavior, I receive in "onNewIntent" always the same "media" and "id" in the intent (the last one), whatever on which recommendation I click, I always get the same Intent.
But if I set the action with an "id", the activity "MainActivity" is recreated, so the resume failed, and the context of my webview is cleared my webview is reloaded :( but I get the good intent with the good media in the extra intent values.
Have you a solution to help me to have the behavior I want ?
To simplify my question, how can I resume my Activity B from a recommendation with the good pendingintent without reload my activity ?
Thank you in advance for your help.

I found a solution. I don't think it's the good one but it works for my case.
PendingIntent pIntent = PendingIntent.getActivity(this, id, detailsIntent, PendingIntent.FLAG_UPDATE_CURRENT);
return pIntent;
So, If I set the "resquetCode" with the id, so Android think it's a different Activity and resume it without recreate a new one.

android click notification bring back the application

I want that when the user click on a notification, it brings back the app (instead of create a new instance).
Here is my code (monodroid : in c# but even if you know how to do in android, you may help me).
Intent i = new Intent(context, typeof(MainListProductActivity));
i.AddFlags(ActivityFlags.NewTask | ActivityFlags.BroughtToFront | ActivityFlags.ReorderToFront); // You need this if starting the activity from a service
i.SetAction(Intent.ActionMain);
i.AddCategory(Intent.CategoryLauncher);
context.StartActivity(i);
It works, but it bring back me to the MainListProductActivity. I want that the notification bring back me to the last viewed activity. How to do that ?
More : if the app is not started, I want that the app is launched with the default activity (splashscreen for me) with a parameter.
Thanks.

I solve that by launching a DummyActivity which call Finish on OnCreate.
It works well, even if is not the best way to solve that.

DummyActivity is a great solution. I use it too. Just create dummy and put it instead a needed class on Intent creation:
Intent intent = new Intent(this,DummyActivity.class);
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent, 0);

This problem was solved for me for Xamarin by using:
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ResetTaskIfNeeded);

Launch activity from background app

I have my app running in the background and I want the app to be shown on the top(launched) of the android phone when the code below is ran. (I know the code is ran for sure)
This seems like a simple thing but I spent a couple hours on this site and everyone seems to be suggesting something like this:
Intent intent = new Intent(myActivity.this, myActivity.class);
startActivity(intent);
However, it is not bringing the app to the front and launching it.
I got it to work from a PendingIntent launched from a notification. Which I done by the code below. But I want the app to launch by itself without the user clicking on the notification.
Intent intent = new Intent(myActivity.this, myActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, REQUEST_CODE, intent, 0);
notification.setLatestEventInfo(this, "title", "msg", contentIntent);
I also tried:
Intent intent = new Intent("android.intent.action.MAIN");
startActivity(intent);
and flagging the intent:
intent.setFlags(Intent.FLAG_FROM_BACKGROUND);
intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
But doesn't seem to do anything, any help appreciated.

You should be able to call your own application like this:
Intent intent = new Intent("android.intent.category.LAUNCHER");
intent.setClassName("com.your.package", "com.your.package.MainActivity");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
Edit: Forgot to add intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

From what I understand, you want a service that is running in the background and on a certain event, you want your application's activity to come in front i.e. on the users current screen whatever he is doing. It is not advisable to let a background service launch an application without a user's action. The android developer website says
A status bar notification should be used for any case in which a
background service needs to alert the user about an event that
requires a response. A background service should never launch an
activity on its own in order to receive user interaction. The service
should instead create a status bar notification that will launch the
activity when selected by the user.
Hence, do not try to make it launch on its own.

I An not behind my laptop atm so I am nog sure, but I think you have toe pass a context object hand then do context.startactivity(intent);
Sorry for not wel formated I am at my phone atm
Hope It helps

I am clutching at straws here, but you wrote:
MyActivity is launched first, then I either navigate to another app or just hit the home screen to have my app running in the background.
So the situation is that your original Activity is NOT running in the background, when you pressed HOME it might well could have been stopped and destroyed. Your background task remained orphan and MyActivity.this is null at this point.
Try and test what does Log.i(TAG,MyActivity.this); print into LogCat.

I ended up using a pending intent and instead of stright up trying to use a intent.
Something like this: seems a lot more simple.
Intent.send(this, 0, intent);
Thanks.

Also, I’ve seen since compileSdkVersion 29 it's not possible, unless a few restrictions:
The activity started very recently.
The app called finish() very recently.
Through a PendingIntent, but only after a few seconds after the notification was sent.
The app has been granted the SYSTEM_ALERT_WINDOW permission by the user.
...
https://developer.android.com/guide/components/activities/background-starts

Widget launching a second instance of application

I am having problems launching my application from my widget when it's clicked upon.
Here is a cut of some code
// Create an Intent to launch activity
Intent intent = new Intent(context, Entry_MainTabView.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
updateViews.setOnClickPendingIntent(R.id.Widget, pendingIntent);
Now take the scenario.
I launch my app, exit to the home page , then click on my widget.
It launches a second instance of the application, so when I hit "back" , the application goes away and reveals the other copy. I then hit back again and finally go back to the homescreen.
How can I make the Intent only create a new instance if none already exists in ram ?

Have you looked at singleInstance and singleTask launch modes of an activity? This extract from Pro Android 2 indicates that there is no documented way of ensuring that there is only one instance of the widget running.