## AudioFocusGrabber: a Tool for Testing Audio Focus Handling in Apps
A simple app used to test audio focus handling in apps, especially
MediaSession in Chrome. You can perform audio gain/abandon actions, in
order to simulate a short ping from an SMS or email, or permanent
audio focus gain from other media player apps.
### Setup
#### 1: Build and install the AudioFocusGrabber app
ninja -C out/Debug audio_focus_grabber_apk
adb install -r out/Debug/apks/AudioFocusGrabber.apk
#### 2: Simulate audio focus actions
You can simulate audio focus actions using the UI, the notification
bar or through `adb` shell. There are three kinds of audio focus
actions, corresponding to:
* `AudioManager.AUDIOFOCUS_GAIN`
* `AudioManager.AUDIOFOCUS_TRANSIENT`
* `AudioManager.AUDIOFOCUS_TRANSIENT_MAY_DUCK`
##### 2.1: Controlling from the UI
From the UI, there are three buttons for the three actions. Just click
it, and AudioFocusGrabber will perform the audio focus action, and play a ping
sound.
However in this way, the app must be in background.
##### 2.2: Controlling from the notification
You can also start a notification from the UI, and then you can make
controls from the notification.
In this way, the app must be in background or losed window focus.
##### 2.3 Controlling from the `adb` shell
From the `adb` shell, which you can do it even if the AudioFocusGrabber is not
in foreground. You may use the following three commands:
adb shell am startservice -a AUDIO_FOCUS_GRABBER_GAIN
adb shell am startservice -a AUDIO_FOCUS_GRABBER_TRANSIENT_PAUSE
adb shell am startservice -a AUDIO_FOCUS_GRABBER_TRANSIENT_DUCK
In this way, the app may be in the foreground, in the background or
losed window focus.
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