Merge "docs: Documented how to handle alarms in AA media apps." into mnc-io-docs

      <li><a href="#overview">Provide Audio Services</a></li>

      <li><a href="#config_manifest">Configure Your Manifest</a></li>

      <li><a href="#isconnected">Determine if Your App is Connected</a></li>

      <li><a href="#alarm">Handle Alarms</a></li>

      <li><a href="#implement_browser">Build a Browser Service</a></li>

      <li><a href="#implement_callback">Implement Play Controls</a></li>

      <li><a href="#support_voice">Support Voice Actions</a></li>

registerReceiver(receiver, filter);

</pre>

<h2 id="alarm">Handle Alarms</h2>

<p>

To prevent user distraction, Android Auto media apps must not start playing audio

 through the car speakers unless a user consciously starts playback (such as

 when the user presses play in your app). Even a user-scheduled alarm from the

 media app must not start playing music through the car speakers.

 If your media app has an alarm feature, the app should determine if the phone

 is in

<a href="{@docRoot}reference/android/content/res/Configuration.html#UI_MODE_TYPE_CAR">car mode</a>

before playing any audio. Your app can do this by calling

<a href="{@docRoot}reference/android/app/UiModeManager.html">UiModeManager.getCurrentModeType()</a>,

 which checks whether the device is running in car mode.

</p>

<p>

If the device is in car mode, media apps that support alarms must do one of the

following things:

<ul>

<li>Disable the alarm.</li>

<li>Play the alarm over

<a href="{@docRoot}reference/android/media/AudioManager.html">STREAM_ALARM</a>,

 and provide a UI on the phone screen to disable the alarm.</li>

</ul>

The following code snippet checks whether an app is running in car mode:

<pre>

 public static boolean isCarUiMode(Context c) {

      UiModeManager uiModeManager = (UiModeManager) c.getSystemService(Context.UI_MODE_SERVICE);

      if (uiModeManager.getCurrentModeType() == Configuration.UI_MODE_TYPE_CAR) {

            LogHelper.d(TAG, "Running in Car mode");

            return true;

      } else {

          LogHelper.d(TAG, "Running on a non-Car mode");

          return false;

        }

  }

</pre>

<h2 id="implement_browser">Build a Browser Service</h2>