63 lines
2.4 KiB
Plaintext
63 lines
2.4 KiB
Plaintext
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page.title=Using Speakers on Wearables
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@jd:body
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<div id="tb-wrapper">
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<div id="tb">
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<h2>This lesson teaches you to</h2>
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<ol>
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<li><a href="#Detect">Detect the Speaker</a></li>
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<li><a href="#Play">Play Sounds</a></li>
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</ol>
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<h2>You should also read</h2>
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<ul>
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<li><a href="{@docRoot}design/wear/watchfaces.html">Watch Faces for Android Wear</a></li>
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</ul>
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</div>
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</div>
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<p>Some Android Wear devices include speakers, enabling them to incorporate sound into their
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apps and offer an extra dimension of engagement with the user. A speaker-equipped Wear device might
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trigger a clock or timer alarm, complete with audio notification. Games on Wear become become more
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entertaining by offering not just sight, but sound.</p>
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<p>This page describes how apps on Wear devices running Android 6.0 (API level 23) can use
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familiar Android APIs to play sounds through the device speaker.</p>
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<h2 id="Detect">Detect the Speaker</h2>
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<p>A Wear app must first detect whether the wearable device has a speaker. In the following example,
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the app uses the {@link android.media.AudioManager#getDevices(int) getDevices() } method in
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conjunction with the value of {@link android.content.pm.PackageManager#FEATURE_AUDIO_OUTPUT} to
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confirm that the device is equipped with a speaker.</p>
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<pre>
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PackageManager packageManager = context.getPackageManager();
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AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
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// Check whether the device has a speaker.
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
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// Check FEATURE_AUDIO_OUTPUT to guard against false positives.
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if (!packageManager.hasSystemFeature(PackageManager.FEATURE_AUDIO_OUTPUT)) {
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return false;
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}
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AudioDeviceInfo[] devices = audioManager.getDevices(AudioManager.GET_DEVICES_OUTPUTS);
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for (AudioDeviceInfo device : devices) {
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if (device.getType() == AudioDeviceInfo.TYPE_BUILTIN_SPEAKER) {
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return true;
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}
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}
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}
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return false;
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</pre>
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<h2 id="Play">Play Sounds</h2>
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<p>Once you've detected the speaker, the process for playing sound on Android Wear is the
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same as for a handset or other device. For more information, see
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<a href="{@docRoot}guide/topics/media/mediaplayer.html">Media Playback</a>.</p>
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<p>If you also want to record audio from the microphone on the wearable, your app must also get
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permission to use the microphone. To learn more, see
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<a href="{@docRoot}training/articles/wear-permissions.html">Permissions on Android Wear.</a></p>
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