Develop Reference

How to tell if android popup notification is opened

I'm developing a unity game for android and I'm looking for a way to pause the game whenever a notification pops up on the screen.
This is troublesome because pause menu button is at the top of screen and therefore lies behind the popup message and player cannot click on it.
I already implemented OnApplicationFocus() and successfully pause the game. However I also want to pause in these kind of occasions.
I found this answer for monitoring battery level but I'm looking for a general way for recognizing all kinds of popups.

Volume slider while casting

I need to show the volume slider while casting an audio content to a Chromecast remote.
If I put the app to the background the slider is shown (see this).
The problem is that the framework does not show the slider when the app is not in the background.I guess it is because an application can decide to do something else.
I have tried to call
mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_SAME, AudioManager.FLAG_SHOW_UI);
with no success: the slider that is shown does not have the Chromecast icon and does not report the current volume on the remote. In other words the slider is related with the local audio volume.
is there a way to ask the framework to keep showing the slider even when the app is in the foreground?
Edited
Actually the behaviour even with the VideoCast app is a bit inconsistent. On some phones it is enough to bring the app in the background and make the framework showing the volume slider. After that it will keep showing it even when the app is in the foreground. On other phones this does not work or it is not necessary because the slider is shown correctly.

There is a bit of improvement that can be made; when media is playing back (i.e. if it is not on pause), you can achieve what you want. To see how, you need to override onKeyDown; take a look at the CastVideos-android sample, in class VideoBrowserActivity and try that to see if it does what you'd like or not.

Since you want to show the Chromecast control instead of the generic music control, you need to call:
mAudioManager.adjustSuggestedStreamVolume(AudioManager.ADJUST_SAME,
AudioManager.USE_DEFAULT_STREAM_TYPE, AudioManager.FLAG_SHOW_UI);

Android, Two applications active at the same time [duplicate]

In Android , Is it possible to display one application(rendering Video) as a floating screen in one half of the screen. and at the same time interacting with another application(e.g chat application or any other application. ).The floating screen appliction will be my application so that it will allow the user to do multitasking.
The idea is to keep the surfaceview of the application, which is rendering the video, on top, and at the same time interact with other applications.e.g gallery or any other application..

If by "two active applications" then you mean real applications (i.e. with activities, back stack, &c) active at the same time, then no (except in some specialized devices, with custom APIs).
However, there is a trick you can use to achieve a similar effect. Applications with the android.permission.SYSTEM_ALERT_WINDOW (displayed as "draw over other apps" in Play Store) can create windows from a service and show them. So you could probably get the effect you want with this method.
There is an open source library called StandOut which provides this behavior in an easy to use manner. You might want to take a look at it.

In short, the answer is no. There is no way currently for multiple apps to be visible on the screen at the same time.
You could theoretically reuse code over multiple different applications, so you could create a video window that could play video, while simultaneously showing a text editor fragment that allows notes to be taken, and you can send data between different applications using an Intent, but unlike modern desktop computers, only one application can currently have the focus of the screen at a time in Android.

Is it possible to have two active applications in android?

In Android , Is it possible to display one application(rendering Video) as a floating screen in one half of the screen. and at the same time interacting with another application(e.g chat application or any other application. ).The floating screen appliction will be my application so that it will allow the user to do multitasking.
The idea is to keep the surfaceview of the application, which is rendering the video, on top, and at the same time interact with other applications.e.g gallery or any other application..

If by "two active applications" then you mean real applications (i.e. with activities, back stack, &c) active at the same time, then no (except in some specialized devices, with custom APIs).
However, there is a trick you can use to achieve a similar effect. Applications with the android.permission.SYSTEM_ALERT_WINDOW (displayed as "draw over other apps" in Play Store) can create windows from a service and show them. So you could probably get the effect you want with this method.
There is an open source library called StandOut which provides this behavior in an easy to use manner. You might want to take a look at it.

In short, the answer is no. There is no way currently for multiple apps to be visible on the screen at the same time.
You could theoretically reuse code over multiple different applications, so you could create a video window that could play video, while simultaneously showing a text editor fragment that allows notes to be taken, and you can send data between different applications using an Intent, but unlike modern desktop computers, only one application can currently have the focus of the screen at a time in Android.

Is there a list of "best practices" for Android games?

I'm writing my first Android game, and though the game itself is working well, I'm not too sure about some of the Android integration aspects of it. Specifically:
Should I provide an in-game volume control?
Should I hide the status bar?
Is the Menu button generally used to pause the game, or should I provide an on-screen control for this?
etc.
Basically I just want my game to do everything the "standard" way. I don't want to frustrate users. Is there some resource (official or not) that lists recommendations for such things? Alternatively, can anyone give me a few important guidelines?

There are no official guidelines how to do this, but some 'Android common sense' would be advisable.
As usual, there is more than one way to do anything, but most of the apps seem to follow the following principles:
full screen games (especially ones in landscape mode) seem to hide the status bar most of the time
you should override the menu button, so it does not get pressed accidentally, but provide a quick way to leave the game
back button usually pauses the app
you do not need in-game volume control since all of existing android devices include a volume rocker, but make turning the volume off available as soon as the game (splash screen) starts, preferably give the person a few moments to turn it off before the music start (a 'would you like to turn the music down?' dialog would be nice)
an (as usually on android) don't count on anything and specify special game requirements (trackpad support, min screen size, ...) in the manifest file
hopefully you can find some more resources online