blocks|key|4650670|text|下面是新的“官方文档”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4650671|在底部它描述了锁定屏幕的详细信息|4650672|https://developer.android.com/guide/topics/media-apps/working-with-a-media-session.html#maintain-state|offset|length|4650673|作为另一种选择，一旦我理解了所有术语和行话，本教程将帮助我概述MediaSessionCompat服务的一般结构。|4650674|https://code.tutsplus.com/tutorials/background-audio-in-android-with-mediasessioncompat--cms-27030|4650675|最后，在Nougat和更高版本中有一个用于锁定屏幕墙纸的API。现在我不明白为什么不支持lib。|4650676|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|2U|0|0|0|0|2Q|1|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|L|3|M|5|6|7|16|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|E]]|U|$5|Q|R|S|A|$T|K]]]]

So here is the new "official docs"

At the bottom it describes the lock screen details

<a href="https://developer.android.com/guide/topics/media-apps/working-with-a-media-session.html#maintain-state" rel="nofollow noreferrer">https://developer.android.com/guide/topics/media-apps/working-with-a-media-session.html#maintain-state</a>

As an alternative, once I understood all the terms and jargon, this tutorial helped me outline the general structure for the MediaSessionCompat services.

<a href="https://code.tutsplus.com/tutorials/background-audio-in-android-with-mediasessioncompat--cms-27030" rel="nofollow noreferrer">https://code.tutsplus.com/tutorials/background-audio-in-android-with-mediasessioncompat--cms-27030</a>

Finally, there is an API for lock screen wallpaper in Nougat and greater. 
Why this is not support lib is beyond me at this time.

blocks|key|144061|text|正如here所解释的，关键是将MediaMetadata对象传递给您的MediaSession。如果这些术语对您来说很陌生，最好从头开始链接教程。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|144062|我发现.putBitmap(MediaMetadata.METADATA_KEY_ART,+bitmap)行是用于将图像加载到锁屏背景的那行代码。但也要确保填充.putBitmap(MediaMetadata.METADATA_KEY_ALBUM_ART,+bitmap)。|style|CODE|144063|entityMap|0|LINK|mutability|MUTABLE|url|http://sapandiwakar.in/android-media-player-lock-screen/^0|2|4|0|0|3|1E|28|1K|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@$A|U|B|V|F|G]|$A|W|B|X|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

as explained <a href="http://sapandiwakar.in/android-media-player-lock-screen/" rel="nofollow noreferrer">here</a> the key is to to pass a MediaMetadata object to your MediaSession. If these terms seems alien to you it's best to start the linked tutorial from the top.

I found the <code>.putBitmap(MediaMetadata.METADATA_KEY_ART, bitmap)</code> line to be the one that is taken to load the image to the lockscreen background. But be sure to populate <code>.putBitmap(MediaMetadata.METADATA_KEY_ALBUM_ART, bitmap)</code>as well.

blocks|key|144104|text|在尝试了一些方法之后，我在这里有一个简单的代码；尝试使用这个方法；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|144105|private+void+updateMetaData()+{
++++mediaSession+=new+MediaSessionCompat(context,"BXPlayer");

++++Bitmap+cover+=+BitmapFactory.decodeResource(context.getResources(),
++++++++++++R.drawable.cover2);+

+++mediaSession.setMetadata(new+MediaMetadataCompat.Builder()
++++++++++++.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART,+cover)
++++++++++++.putString(MediaMetadataCompat.METADATA_KEY_ARTIST,+mSelectedSong.getArtist())
++++++++++++.putString(MediaMetadataCompat.METADATA_KEY_ALBUM,+mSelectedSong.getAlbum())
++++++++++++.putString(MediaMetadataCompat.METADATA_KEY_TITLE,+mSelectedSong.getTitle())
++++++++++++.build());
}|code-block|syntax|javascript|144106|然后，在通知中，您需要将样式设置为android.support.v4.media.app.NotificationCompat.MediaStyle()，并将媒体会话令牌设置为使用当前元数据。检查下面的代码片段；|offset|length|style|CODE|144107|builder.setStyle(new+android.support.v4.media.app.NotificationCompat.MediaStyle()
++++++++++++.setShowActionsInCompactView(0,+1,+2)
++++.setMediaSession(mediaSession.getSessionToken()));
++++return+builder.build();|144108|要工作，你必须在你的应用程序build.gradle和boom中包含implementation+"com.android.support:support-v4:$latest_version"！你可以走了。|144109|entityMap^0|0|0|H|1O|0|0|E|C|Y|1R|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

Well, after trying some ways, I have a simple code here;
Try using this method;

<pre><code>private void updateMetaData() {
 mediaSession =new MediaSessionCompat(context,"BXPlayer");

 Bitmap cover = BitmapFactory.decodeResource(context.getResources(),
 R.drawable.cover2); 

 mediaSession.setMetadata(new MediaMetadataCompat.Builder()
 .putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, cover)
 .putString(MediaMetadataCompat.METADATA_KEY_ARTIST, mSelectedSong.getArtist())
 .putString(MediaMetadataCompat.METADATA_KEY_ALBUM, mSelectedSong.getAlbum())
 .putString(MediaMetadataCompat.METADATA_KEY_TITLE, mSelectedSong.getTitle())
 .build());
}
</code></pre>

then in your notification you need to set style to <code>android.support.v4.media.app.NotificationCompat.MediaStyle()</code> and set the media session token to use the current metadata.
Check this snippet below;

<pre><code>builder.setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
 .setShowActionsInCompactView(0, 1, 2)
 .setMediaSession(mediaSession.getSessionToken()));
 return builder.build();
</code></pre>

To work, you must include <code>implementation "com.android.support:support-v4:$latest_version"</code> in your app <code>build.gradle</code>
And boom! you are good to go.

I know that this topic has been already discussed <a href="https://stackoverflow.com/questions/8071162/android-set-lock-screen-wallpaper-programmatically" title="here">here</a>, <a href="https://stackoverflow.com/questions/2653954/how-to-set-android-lock-screen-image" title="here">here</a> and <a href="https://stackoverflow.com/questions/14728824/how-to-change-the-lockscreen-wallpaper-in-android" title="here">here</a>, and the answer seems to be that it is not possible. 

But I recently installed Spotify in my Nexus 4 (4.4.2), and it seems to be possible. When I listen a song in Spotify the lock screen background change with the cover of the album that I'm listening (see screenshots). 

My theory was: 
when the phone is locked they <a href="https://stackoverflow.com/questions/10160267/how-to-set-image-as-wallpaper-programmatically">change the phone wallpaper</a> with the album cover in order to change also the lock screen background, then they set back the previous one when the phone is unlocked. But this is not how they do it, because in the permissions list of Spotify there is no "android.permission.SET_WALLPAPER"... :( 

How do they do it? Some theory? 

<img src="https://i.stack.imgur.com/CBptw.jpg" alt="Screenshot lock screen">
<img src="https://i.stack.imgur.com/m2yLj.png" alt="Screenshot lock screen">

Set lock screen background in Android (like Spotify do)

我知道这个话题已经被，和讨论过了，答案似乎是不可能的。但我最近在我的Nexus4 (4.4.2)中安装了Spotify，这似乎是可能的。当我在Spotify中听一首歌时，锁定屏幕背景会随着我正在听的专辑的封面而改变(见截图)。我的理论是:当手机被锁定时，他们使用专辑封面进行，以便同时更改锁定屏幕背景，然后在手机解锁时设...

问在Android中设置锁屏背景(像Spotify一样)
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