Merge \"docs: Fixing MediaSession note in PIP preview docs\" into mnc-io-docs

Picture-in-picture</h2>

<p>When your activity switches to PIP, the system considers the activity in a

paused state, and calls your activity's <code>onPause()</code> method. Video

playback should not be paused and should continue playing if the activity is

paused due to PIP mode. Check for PIP in your activity's

<code>onPause()</code> method and handle playback appropriately, for

example:</p>

paused state, and calls your activity's {@link android.app.Activity#onPause

onPause()} method. Video playback should not be paused and should continue

playing if the activity is paused due to PIP mode.</p>

<p>In Android N, you should pause and resume video playback when the system

calls your activity's {@link android.app.Activity#onStop onStop()} and

{@link android.app.Activity#onStart onStart()}. By doing this, you can avoid

having to check if your app is in PIP mode in

{@link android.app.Activity#onPause onPause()} and explicitly

continuing playback.</p>

<p>If you have to pause playback in your {@link android.app.Activity#onPause

onPause()} implementation, check for PIP mode by calling {@code

isInPictureInPictureMode()} and handle playback appropriately, for example:</p>

<pre>

@Override

</pre>

<p>When your activity switches out of PIP mode back to full-screen mode, the

system resumes your activity and calls your <code>onResume()</code> method.</p>

system resumes your activity and calls your

{@link android.app.Activity#onResume onResume()} method.</p>

<h2 id="single_playback">Using a Single Playback Activity for

Picture-in-picture</h2>

<p>When an activity is in PIP mode, by default it doesn't get input focus. To

receive input events while in PIP mode, use

<code>MediaSession.setMediaButtonReceiver()</code>.</p>

{@link android.media.session.MediaSession#setCallback

MediaSession.setCallback()}. For more information on using

{@link android.media.session.MediaSession#setCallback setCallback()} see

<a href="{@docRoot}training/tv/playback/now-playing.html">Displaying

a Now Playing Card</a>.</p>

<p>When your app is in PIP mode, video playback in the PIP window can cause

audio interference with another app, such as a music player app or voice search

app. To avoid this, request audio focus when you start playing the video,

and handle audio focus change notifications, as described in

<a href="{@docRoot}training/managing-audio/audio-focus.html">Managing Audio

Focus</a>. If you receive notification of audio focus loss when in PIP mode,

pause or stop video playback.</p>