blocks|key|3919|text|问题是create()将MediaPlayer置于不接受属性的状态(它为您调用prepare()+)。您需要使用更冗长的机制来创建播放器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3920|++final+MediaPlayer+mediaPlayer+=+new+MediaPlayer();
++mediaPlayer.setDataSource(...);

++AudioAttributes+attrs+=+new+AudioAttributes.Builder().setUsage(usage).build();
++mediaPlayer.setAudioAttributes(attrs);

++new+AsyncTask<Void,Void,Boolean>()+{
++++@Override
++++protected+Boolean+doInBackground(Void...+voids)+{
++++++try+{
++++++++mediaPlayer.prepare();
++++++++return+true;
++++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++++}
++++++return+false;
++++}

++++@Override
++++protected+void+onPostExecute(Boolean+prepared)+{
++++++if+(prepared)+{
++++++++++mediaPlayer.start();
++++++}
++++}
++}.execute();|code-block|syntax|javascript|3921|entityMap^0|3|8|C|B|13|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

The problem is that <code>create()</code> puts the <code>MediaPlayer</code> in a state where it won't accept the attributes (it calls <code>prepare()</code> for you). You need to use the more verbose mechanism of creating the player.

<pre><code> final MediaPlayer mediaPlayer = new MediaPlayer();
 mediaPlayer.setDataSource(...);

 AudioAttributes attrs = new AudioAttributes.Builder().setUsage(usage).build();
 mediaPlayer.setAudioAttributes(attrs);

 new AsyncTask&lt;Void,Void,Boolean&gt;() {
 @Override
 protected Boolean doInBackground(Void... voids) {
 try {
 mediaPlayer.prepare();
 return true;
 } catch (IOException e) {
 e.printStackTrace();
 }
 return false;
 }

 @Override
 protected void onPostExecute(Boolean prepared) {
 if (prepared) {
 mediaPlayer.start();
 }
 }
 }.execute();
</code></pre>

blocks|key|4367|text|我赞同杰弗里·布拉特曼上面的回答，但这里是完整的代码，展示了如何使用setDataSource处理您放入应用程序资源中的音频文件(raw)。还有一些我在旅途中学到的其他东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4368|static+public+void+playAlarmSound+()+{
++++final+MediaPlayer+mediaPlayer+=+new+MediaPlayer();
++++new+AsyncTask<Void,+Void,+Boolean>()+{
++++++++@Override
++++++++protected+Boolean+doInBackground(Void...+voids)+{
++++++++++++try+{
++++++++++++++++mediaPlayer.setOnCompletionListener(new+MediaPlayer.OnCompletionListener()+{
++++++++++++++++++++@Override
++++++++++++++++++++public+void+onCompletion(MediaPlayer+mp)+{
++++++++++++++++++++++++mediaPlayer.reset();
++++++++++++++++++++++++mediaPlayer.release();
++++++++++++++++++++}
++++++++++++++++});
++++++++++++++++mediaPlayer.setOnPreparedListener(new+MediaPlayer.OnPreparedListener()+{
++++++++++++++++++++@Override
++++++++++++++++++++public+void+onPrepared(MediaPlayer+mp)+{
++++++++++++++++++++++++mediaPlayer.start();
++++++++++++++++++++}
++++++++++++++++});
++++++++++++++++AssetFileDescriptor+afd+=+getContext().getResources().openRawResourceFd(R.raw.nameofyourresource);
++++++++++++++++if+(afd+==+null)+return+false;
++++++++++++++++mediaPlayer.setDataSource(afd.getFileDescriptor(),+afd.getStartOffset(),+afd.getLength());
++++++++++++++++afd.close();

++++++++++++++++if+(Build.VERSION.SDK_INT+>=+21)+{
++++++++++++++++++++mediaPlayer.setAudioAttributes(new+AudioAttributes.Builder()
++++++++++++++++++++++++++++.setUsage(AudioAttributes.USAGE_ALARM)
++++++++++++++++++++++++++++.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
++++++++++++++++++++++++++++.build());
++++++++++++++++}+else+{
++++++++++++++++++++mediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
++++++++++++++++}
++++++++++++++++mediaPlayer.setVolume(1.0f,+1.0f);
++++++++++++++++mediaPlayer.prepare();
++++++++++++++++return+true;
++++++++++++}+catch+(Exception+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++}
++++++++++++return+false;
++++++++}

++++}.execute();
}|code-block|syntax|javascript|4369|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I upvoted Jeffrey Blattman's answer above, but here is the full code that shows how to use setDataSource with an audio file that you put into your app resources (raw). Also a couple of other things I picked up in my travels...

<pre><code>static public void playAlarmSound () {
 final MediaPlayer mediaPlayer = new MediaPlayer();
 new AsyncTask&lt;Void, Void, Boolean&gt;() {
 @Override
 protected Boolean doInBackground(Void... voids) {
 try {
 mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
 @Override
 public void onCompletion(MediaPlayer mp) {
 mediaPlayer.reset();
 mediaPlayer.release();
 }
 });
 mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
 @Override
 public void onPrepared(MediaPlayer mp) {
 mediaPlayer.start();
 }
 });
 AssetFileDescriptor afd = getContext().getResources().openRawResourceFd(R.raw.nameofyourresource);
 if (afd == null) return false;
 mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
 afd.close();

 if (Build.VERSION.SDK_INT &gt;= 21) {
 mediaPlayer.setAudioAttributes(new AudioAttributes.Builder()
 .setUsage(AudioAttributes.USAGE_ALARM)
 .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
 .build());
 } else {
 mediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
 }
 mediaPlayer.setVolume(1.0f, 1.0f);
 mediaPlayer.prepare();
 return true;
 } catch (Exception e) {
 e.printStackTrace();
 }
 return false;
 }

 }.execute();
}
</code></pre>

I have done a lot of googling but other's solutions are not working for me.

My goal is to play a sound on demand on the alarm channel. 
(So the sound volume is adjusted by the alarm volume setting)

from this <a href="https://stackoverflow.com/questions/33961439/how-to-play-a-ringtone-using-the-alarm-volume-with-setaudioattributes">thread</a> I build the following code

<pre><code>mediaPlayerScan = MediaPlayer.create(getContext(), R.raw.scan_beep);

if (Build.VERSION.SDK_INT &gt;= 21) {
 mediaPlayerScan.setAudioAttributes(new AudioAttributes.Builder()
 .setUsage(AudioAttributes.USAGE_ALARM)
 .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
 .build());
} else {
 mediaPlayerScan.setAudioStreamType(AudioManager.STREAM_ALARM);
}
</code></pre>

It still plays on the music channel.
(IE volume is adjusted in music setting not alarm)

My intuition is that i'm missing a permission or something, but I haven't found such a permission.

I'm testing on a Google Pixel 1

Thanks, 
Nathan

Edit:

Thanks to @jeffery-blattman the following code works for me 

<pre><code>mediaPlayerScan = new MediaPlayer();
try {
 mediaPlayerScan.setDataSource(getContext(),
 Uri.parse(getString(R.string.res_path) + R.raw.scan_beep));

 if (Build.VERSION.SDK_INT &gt;= 21) {
 mediaPlayerScan.setAudioAttributes(new AudioAttributes.Builder()
 .setUsage(AudioAttributes.USAGE_ALARM)
 .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
 .build());
 } else {
 mediaPlayerScan.setAudioStreamType(AudioManager.STREAM_ALARM);
 }
 mediaPlayerScan.prepare();
} catch (IOException e) {
 e.printStackTrace();
}
</code></pre>

Playing sound on the alarm channel on android

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我做了很多谷歌搜索，但其他人的解决方案对我不起作用。我的目标是在闹钟频道上按需播放声音。(因此，音量由闹钟音量设置调整)根据这个，我构建了以下代码mediaPlayerScan = MediaPlayer.create(getContext(), R.raw.scan_beep);if (Build.VERSION.S...

问在android的闹钟频道上播放声音
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问在android的闹钟频道上播放声音
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