前言
内容颇多,尽量从简
ExoPlayer使用
实现效果
Android(java)
使用ExoPlayer播放视频,自定义ExoPlayer界面,记录播放位置(横屏竖屏切换/切换至后台等)
案例实现
创建项目
添加依赖
Sync 一下
/// Jetpack Media3 ExoPlayer
implementation ("androidx.media3:media3-exoplayer:1.3.1")
implementation ("androidx.media3:media3-ui:1.3.1")
implementation ("androidx.media3:media3-common:1.3.1")
转到activity_main.xml
选择Player.View
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.media3.ui.PlayerView
android:id="@+id/video_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
player初始化
要在Activity的生命周期中完成player的初始化销毁等
package com.test.exoplayerexampleapplication;
import androidx.annotation.OptIn;
import androidx.appcompat.app.AppCompatActivity;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.common.util.Util;
import androidx.media3.ui.PlayerView;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@OptIn(markerClass = UnstableApi.class) @Override
protected void onStart() {
super.onStart();
if (Util.SDK_INT >= 24) {
initializePlayer();
}
}
@OptIn(markerClass = UnstableApi.class) @Override
protected void onResume() {
super.onResume();
if (Util.SDK_INT < 24) {
initializePlayer();
}
}
private void initializePlayer() {}
}
定义PlayerView,ExoPlayer
private PlayerView playerView;
private ExoPlayer exoPlayer;
private final Uri videoOneUri = Uri.parse("http://www.w3school.com.cn/example/html5/mov_bbb.mp4");
在AndroidManifest.xml中定义网络权限,如果链接是Http,还需加userCleartextTraffic
<uses-permission android:name="android.permission.INTERNET" />
android:usesCleartextTraffic="true"
定义initializePlayer()方法
private void initializePlayer() {
playerView = findViewById(R.id.video_view);
exoPlayer = new ExoPlayer.Builder(this).build();
playerView.setPlayer(exoPlayer);
MediaItem mediaItem = MediaItem.fromUri(videoOneUri);
exoPlayer.addMediaItem(mediaItem);
exoPlayer.prepare();
}
运行可以播放视频
释放资源
媒体播放器是很占用资源的,所以当不再需要播放器时,要释放它,当然也要在Activity的生命周期中释放资源
在onStop和onPause适当调用
@OptIn(markerClass = UnstableApi.class) @Override
protected void onPause() {
super.onPause();
if (Util.SDK_INT < 24) {
releasePlayer();
}
}
@OptIn(markerClass = UnstableApi.class) @Override
protected void onStop() {
super.onStop();
if (Util.SDK_INT >= 24) {
releasePlayer();
}
}
private void releasePlayer() {
exoPlayer.release();
}
记录视频的播放状态
重新运行项目,测试切换至后台
切换至后台的生命周期,可以知道当APP放到后台,会调用player.release()方法释放
我们发现视频切换到后台,再切换回来,之前的播放到第四秒,切换回来发现,又回到第0秒。所以,现在需要记录之前播放的位置,播放的状态,播放到第几个视频了。
既然没有onDestory掉Activity
那么定义三个变量(播放位置,播放状态,第几个视频)
private Long playbackPosition = 0L;
private int currentMediaItemIndex = 0;
private boolean playWhenReady = false;
playbackPosition = exoPlayer.getCurrentPosition();
currentMediaItemIndex = exoPlayer.getCurrentMediaItemIndex();
playWhenReady = exoPlayer.getPlayWhenReady();
exoPlayer.setPlayWhenReady(playWhenReady);
exoPlayer.seekTo(currentMediaItemIndex, playbackPosition);
添加新的视频链接
private final Uri videoTwoUri = Uri.parse("https://media.w3.org/2010/05/sintel/trailer.mp4");
运行测试,播放下一个视频,并播放至一半,切换到后台,再切换回来
横竖屏切换
横竖屏切换的生命周期,Activity被Destory了
使用SharedPreference来存储键值对,参考官方文档,官方推荐用DataStore
那使用DataStore
我们现在做的事情是,使用DataStore Preference来存储视频在释放之前的播放进度,播放状态,播放到第几个视频了。
按照官网配置Preferences DataStore
引入依赖
/// Preferences DataStore
implementation("androidx.datastore:datastore-preferences:1.0.0")
/// RxJava2 support
implementation("androidx.datastore:datastore-preferences-rxjava2:1.0.0")
/// RxJava3 support
implementation("androidx.datastore:datastore-preferences-rxjava3:1.0.0")
实例RxDataStore,销毁
private RxDataStore<Preferences> dataStore;
if (dataStore == null) {
dataStore = new RxPreferenceDataStoreBuilder(this, "ExoPlayerKeys").build();
}
@Override
protected void onDestroy() {
super.onDestroy();
if (dataStore != null) {
dataStore.dispose();
}
}
定义三个Key
Preferences.Key<Integer> currentMediaItemIndexPK;
Preferences.Key<Integer> playbackPositionPK;
Preferences.Key<Boolean> playWhenReadyPK;
currentMediaItemIndexPK = PreferencesKeys.intKey("currentMediaItemIndex");
playbackPositionPK = PreferencesKeys.intKey("playbackPosition");
playWhenReadyPK = PreferencesKeys.booleanKey("playWhenReady");
使用PreferencesKeys存储值
private void saveVideoRecord() {
dataStore.updateDataAsync(preferences -> {
MutablePreferences mutablePreferences = preferences.toMutablePreferences();
mutablePreferences.set(currentMediaItemIndexPK, currentMediaItemIndex);
mutablePreferences.set(playbackPositionPK, playbackPosition.intValue());
mutablePreferences.set(playWhenReadyPK, playWhenReady);
return Single.just(mutablePreferences);
});
}
在onCreate()中取出之前存储的值,首次运行时,是没有存值的,所以会异常NULL,所以没有值就初始化这些变量
try {
currentMediaItemIndex = dataStore.data().map(preferences -> preferences.get(currentMediaItemIndexPK)).blockingFirst();
} catch (Exception e) {
currentMediaItemIndex = 0;
}
try {
playbackPosition = Long.valueOf(dataStore.data().map(preferences -> preferences.get(playbackPositionPK)).blockingFirst());
} catch (Exception e) {
playbackPosition = 0L;
}
try {
playWhenReady = dataStore.data().map(preferences -> preferences.get(playWhenReadyPK)).blockingFirst();
} catch (Exception e) {
playWhenReady = false;
}
删除APP,重新运行项目,旋转屏幕也能记录播放状态,和播放进度,播放第几个视频
旋转后,仍然从之前播放的进度继续,保持暂停。
监听事件
@OptIn(markerClass = UnstableApi.class)
private void addPlayerListener() {
listener = new Player.Listener() {
@OptIn(markerClass = UnstableApi.class)
@Override
public void onPlaybackStateChanged(int playbackState) {
Player.Listener.super.onPlaybackStateChanged(playbackState);
String stateString = "UNKNOWN_STATE";
if (playbackState == ExoPlayer.STATE_IDLE) {
stateString = "EXoPlayer.STATE_IDLE";
} else if (playbackState == ExoPlayer.STATE_BUFFERING) {
stateString = "ExoPlayer.STATE_BUFFERING";
} else if (playbackState == Player.STATE_READY) {
stateString = "ExoPlayer.STATE_READY";
} else if (playbackState == Player.STATE_ENDED) {
stateString = "ExoPlayer.STATE_ENDED";
}
Log.d(TAG, "changed state to " + stateString);
}
};
exoPlayer.addListener(listener);
analyticsListener = new AnalyticsListener() {
@Override
public void onRenderedFirstFrame(EventTime eventTime, Object output, long renderTimeMs) {
AnalyticsListener.super.onRenderedFirstFrame(eventTime, output, renderTimeMs);
Log.i(TAG, "AnalyticsListener - onRenderedFirstFrame - 等待多长时间才能在屏幕上看到有意义的内容 - " + renderTimeMs);
}
@Override
public void onDroppedVideoFrames(EventTime eventTime, int droppedFrames, long elapsedMs) {
AnalyticsListener.super.onDroppedVideoFrames(eventTime, droppedFrames, elapsedMs);
Log.i(TAG, "AnalyticsListener - onDroppedVideoFrames - 视频丢帧 - " + droppedFrames);
}
@Override
public void onAudioUnderrun(EventTime eventTime, int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs) {
AnalyticsListener.super.onAudioUnderrun(eventTime, bufferSize, bufferSizeMs, elapsedSinceLastFeedMs);
Log.i(TAG, "AnalyticsListener - onAudioUnderrun - 音频欠载 - " + bufferSizeMs);
}
};
exoPlayer.addAnalyticsListener(analyticsListener);
}
自定义ExoPlayer界面
按住Command键,左键查看PlayerView.java,鼠标hover在文件上,看它的位置,可以顺藤摸瓜找到它的源码
布局界面在这里
复制到自己的项目中
在此基础上更改custom_player_control_view.xml
MediaSessionService后台播放
实现效果
让媒体挂在后台播放,如下图
正如官网所说,可以用在长视频,听视频。显然上面没有很多的交互,如果短视频用这个,既看不到播放的内容,也没啥交互,就还是不用MediaSession
案例实现
按照官方配置的步骤,语言还是采用Java。将构建一个MediaSession,让他在后台一直播放,同时可以自定义几个按钮,如点赞,收藏。最后监听视频是否播放。
MediaController
显然需要用到MediaSessionService和MediaController
创建项目
按照步骤,先new 一个ListenableFuture controllerFuture
先引入依赖
implementation ("androidx.media3:media3-session:1.3.1")
implementation ("androidx.media3:media3-exoplayer:1.3.1")
implementation ("androidx.media3:media3-ui:1.3.1")
implementation ("androidx.media3:media3-common:1.3.1")
定义MediaController
package com.test.mediasessionserviceexample;
import androidx.appcompat.app.AppCompatActivity;
import androidx.media3.common.MediaItem;
import androidx.media3.common.MediaMetadata;
import androidx.media3.session.MediaController;
import androidx.media3.session.SessionToken;
import android.content.ComponentName;
import android.net.Uri;
import android.os.Bundle;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.concurrent.ExecutionException;
public class MainActivity extends AppCompatActivity {
ListenableFuture<MediaController> controllerFuture;
private final String mediaUrl = "https://media.w3.org/2010/05/sintel/trailer.mp4";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SessionToken sessionToken = new SessionToken(this, new ComponentName(this, 你的服务));
controllerFuture = new MediaController.Builder(this, sessionToken).buildAsync();
controllerFuture.addListener(() -> {
Uri uri = Uri.parse(mediaUrl);
MediaMetadata metadata = new MediaMetadata.Builder()
.setArtist("阿笙")
.setTitle("我名字是视频")
.build();
MediaItem mediaItem = new MediaItem.Builder()
.setMediaId("media-one")
.setUri(uri)
.setMediaMetadata(metadata).build();
try {
MediaController mediaController = controllerFuture.get();
mediaController.setMediaItem(mediaItem);
mediaController.prepare();
} catch (ExecutionException | InterruptedException e) {
throw new RuntimeException(e);
}
}, MoreExecutors.directExecutor());
}
@Override
protected void onStop() {
super.onStop();
MediaController.releaseFuture(controllerFuture);
}
}
定义服务MediaSessionService
package com.test.mediasessionserviceexample;
import android.content.Intent;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.media3.common.Player;
import androidx.media3.exoplayer.ExoPlayer;
import androidx.media3.session.MediaSession;
import androidx.media3.session.MediaSession.ControllerInfo;
import androidx.media3.session.MediaSessionService;
public class PlaybackService extends MediaSessionService {
private MediaSession mediaSession = null;
@Override
public void onCreate() {
super.onCreate();
ExoPlayer player = new ExoPlayer.Builder(this).build();
mediaSession = new MediaSession.Builder(this, player).build();
}
@Nullable
@Override
public MediaSession onGetSession(@NonNull ControllerInfo controllerInfo) {
return mediaSession;
}
@Override
public void onTaskRemoved(Intent rootIntent) {
super.onTaskRemoved(rootIntent);
Player player = mediaSession.getPlayer();
if (!player.getPlayWhenReady() || player.getMediaItemCount() == 0 || player.getPlaybackState() == Player.STATE_ENDED) {
stopSelf();
}
}
@Override
public void onDestroy() {
super.onDestroy();
mediaSession.getPlayer().release();
mediaSession.release();
mediaSession = null;
}
}
注册服务/申明服务
<service android:name=".PlaybackService"
android:foregroundServiceType="mediaPlayback"
android:exported="true">
<intent-filter>
<action android:name="androidx.media3.session.MediaSessionService"/>
</intent-filter>
</service>
申明权限(网络、前台服务)
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
运行项目
下拉通知,可以看到这个服务,
定义按钮CommandButton
引入图标
private CommandButton cBRemoveFromLikes;
private CommandButton cBRemoveFromFavorites;
private CommandButton cBAddToLikes;
private CommandButton cBAddToFavorites;
private SessionCommand sCAddToLikes;
private SessionCommand sCAddToFavorites;
private SessionCommand sCRemoveFromLike;
private SessionCommand sCRemoveFromFavorite;
private static final String SAVE_TO_LIKES = "save to likes";
private static final String SAVE_TO_FAVORITES = "save to favorites";
private static final String REMOVE_FROM_LIKES = "remove from likes";
private static final String REMOVE_FROM_FAVORITES = "remove from favorites";
sCAddToLikes = new SessionCommand(SAVE_TO_LIKES, new Bundle());
sCAddToFavorites = new SessionCommand(SAVE_TO_FAVORITES, new Bundle());
sCRemoveFromLike = new SessionCommand(REMOVE_FROM_LIKES, new Bundle());
sCRemoveFromFavorite = new SessionCommand(REMOVE_FROM_FAVORITES, new Bundle());
cBAddToLikes = buildCommandButton(SAVE_TO_LIKES, R.drawable.like_icon, sCAddToLikes);
cBAddToFavorites = buildCommandButton(SAVE_TO_FAVORITES, R.drawable.favorite_icon, sCAddToFavorites);
cBRemoveFromLikes = buildCommandButton(REMOVE_FROM_LIKES, R.drawable.like_remove_icon, sCRemoveFromLike);
cBRemoveFromFavorites = buildCommandButton(REMOVE_FROM_FAVORITES, R.drawable.favorite_remove_icon, sCRemoveFromFavorite);
private CommandButton buildCommandButton(String displayName, int iconResId, SessionCommand sessionCommand) {
return new CommandButton.Builder()
.setDisplayName(displayName)
.setIconResId(iconResId)
.setSessionCommand(sessionCommand)
.build();
}
自定义MediaSession的布局
定义MediaSession可以使用哪些自定义命令
在MediaSession.Builder()中setCallback 回调,setCustomLayout布局
通过接收customAction的值,判断当前是什么命令,对应设置布局
class CustomMediaSessionCallback implements MediaSession.Callback {
@OptIn(markerClass = UnstableApi.class)
@NonNull
@Override
public ConnectionResult onConnect(@NonNull MediaSession session, @NonNull ControllerInfo controller) {
SessionCommands sessionCommands = ConnectionResult.DEFAULT_SESSION_COMMANDS.buildUpon()
.add(sCAddToLikes)
.add(sCAddToFavorites)
.add(sCRemoveFromLike)
.add(sCRemoveFromFavorite)
.build();
return new ConnectionResult.AcceptedResultBuilder(session)
.setAvailableSessionCommands(sessionCommands)
.build();
}
@OptIn(markerClass = UnstableApi.class)
@NonNull
@Override
public ListenableFuture<SessionResult> onCustomCommand(@NonNull MediaSession session, @NonNull ControllerInfo controller, @NonNull SessionCommand customCommand, @NonNull Bundle args) {
final CommandButton buttonOne = mediaSession.getCustomLayout().get(0);
final CommandButton buttonTwo = mediaSession.getCustomLayout().get(1);
switch (customCommand.customAction) {
case SAVE_TO_LIKES:
mediaSession.setCustomLayout(ImmutableList.of(cBRemoveFromLikes, buttonTwo));
break;
case SAVE_TO_FAVORITES:
mediaSession.setCustomLayout(ImmutableList.of(buttonOne, cBRemoveFromFavorites));
break;
case REMOVE_FROM_LIKES:
mediaSession.setCustomLayout(ImmutableList.of(cBAddToLikes, buttonTwo));
break;
case REMOVE_FROM_FAVORITES:
mediaSession.setCustomLayout(ImmutableList.of(buttonOne, cBAddToFavorites));
break;
default:
throw new RuntimeException("not implement");
}
return Futures.immediateFuture(new SessionResult(SessionResult.RESULT_SUCCESS));
}
}
运行测试
自定义Player的行为(play等)
ExoPlayer player = new ExoPlayer.Builder(this).build();
ForwardingPlayer forwardingPlayer = new ForwardingPlayer(player) {
@Override
public void play() {
super.play();
Log.d("ForwardingPlayer Log", "play!");
}
};
mediaSession = new MediaSession.Builder(this, forwardingPlayer)
.setCallback(new CustomMediaSessionCallback())
.setCustomLayout(ImmutableList.of(cBAddToLikes, cBAddToFavorites))
.build();
MediaLibraryService
实现目标
参考文档
主要实现三个函数
- onGetLibraryRoot()
- onGetChildren()
- onGetSearchResult()
实现效果
创建一个目录,目录下有三个文件,并且可以根据标题搜索这三个文件
案例实现
采用JAVA实现
创建项目接着引入依赖
implementation ("androidx.media3:media3-session:1.3.1")
implementation ("androidx.media3:media3-exoplayer:1.3.1")
implementation ("androidx.media3:media3-ui:1.3.1")
implementation ("androidx.media3:media3-common:1.3.1")
初始化MediaLibraryService
和MediaSession操作差不多,先实例
package com.test.medialibraryservicetestapplication;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.media3.common.MediaItem;
import androidx.media3.exoplayer.ExoPlayer;
import androidx.media3.session.LibraryResult;
import androidx.media3.session.MediaLibraryService;
import androidx.media3.session.MediaSession;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
public class PlaybackService extends MediaLibraryService {
MediaLibrarySession mediaLibrarySession = null;
MediaLibrarySession.Callback callback = new MediaLibrarySession.Callback() {
@NonNull
@Override
public ListenableFuture<LibraryResult<MediaItem>> onGetLibraryRoot(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @Nullable MediaLibraryService.LibraryParams params) {
return MediaLibrarySession.Callback.super.onGetLibraryRoot(session, browser, params);
}
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetChildren(MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String parentId, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
return MediaLibrarySession.Callback.super.onGetChildren(session, browser, parentId, page, pageSize, params);
}
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetSearchResult(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String query, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
return MediaLibrarySession.Callback.super.onGetSearchResult(session, browser, query, page, pageSize, params);
}
};
@Nullable
@Override
public MediaLibrarySession onGetSession(@NonNull MediaSession.ControllerInfo controllerInfo) {
return mediaLibrarySession;
}
@Override
public void onCreate() {
super.onCreate();
ExoPlayer player = new ExoPlayer.Builder(this).build();
mediaLibrarySession = new MediaLibraryService.MediaLibrarySession.Builder(this, player, callback).build();
}
@Override
public void onDestroy() {
super.onDestroy();
if (mediaLibrarySession != null) {
mediaLibrarySession.getPlayer().release();
mediaLibrarySession.release();
mediaLibrarySession = null;
}
}
}
创建树形结构存储数据
要获取根对象,需要有一个建好的树形数据,就如下面这幅图上,它是一个树,树的根节点RootNode,分叉出去好几个类目,简单起见,这里先弄简单的Root->Music/Game/Study
定义树
构建根节点,添加三个子节点到根节点
最后改为单例
package com.test.medialibraryservicetestapplication;
import java.util.HashMap;
import java.util.Map;
public class Tree {
Map<String, TreeNode> treeNodes;
final String ROOT_ID = "root";
final String MUSIC_ID = "music";
final String GAME_ID = "game";
final String STUDY_ID = "study";
final String ROOT_TITLE = "root title";
final String MUSIC_TITLE = "music title";
final String GAME_TITLE = "game title";
final String STUDY_TITLE = "study title";
private final static Tree instance = new Tree();
public static Tree genInstance() {
return instance;
}
private boolean isInitialized = false;
private Tree() {
if (!isInitialized) {
isInitialized = true;
treeNodes = new HashMap<>();
TreeNode rootNode = new TreeNode(ROOT_ID, ROOT_TITLE);
TreeNode musicNode = new TreeNode(MUSIC_ID, MUSIC_TITLE);
TreeNode gameNode = new TreeNode(GAME_ID, GAME_TITLE);
TreeNode studyNode = new TreeNode(STUDY_ID, STUDY_TITLE);
rootNode.children.add(musicNode.node);
rootNode.children.add(gameNode.node);
rootNode.children.add(studyNode.node);
treeNodes.put(ROOT_ID, rootNode);
}
}
}
获取根节点
MediaItem getTreeRoot() {
return Objects.requireNonNull(treeNodes.get(ROOT_ID)).node;
}
@NonNull
@Override
public ListenableFuture<LibraryResult<MediaItem>> onGetLibraryRoot(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @Nullable MediaLibraryService.LibraryParams params) {
return Futures.immediateFuture(LibraryResult.ofItem(Tree.genInstance().getTreeRoot(), params));
}
获取结点的子节点集合
List<MediaItem> getNodeChildren(String treeNodeId) {
return Objects.requireNonNull(treeNodes.get(treeNodeId)).children;
}
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetChildren(MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String parentId, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
List<MediaItem> children = Tree.genInstance().getNodeChildren(parentId);
if (!children.isEmpty()) {
return Futures.immediateFuture(LibraryResult.ofItemList(children, params));
}
return Futures.immediateFuture(LibraryResult.ofError(LibraryResult.RESULT_ERROR_BAD_VALUE));
}
注册Service及申明权限
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK" />
<service
android:name=".PlaybackService"
android:exported="true"
android:foregroundServiceType="mediaPlayback">
<intent-filter>
<action android:name="androidx.media3.session.MediaSessionService" />
</intent-filter>
</service>
MediaBrowser浏览MediaLibraryService定义的媒体库
获取MediaLibraryService构建的媒体库的根节点
获取某一节点下的子节点
运行测试
运行项目,并在60行打上断点,看到value属性值为三个MediaItem对象
可以看到获取到根节点下的三个子节点
package com.test.medialibraryservicetestapplication;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.media3.common.MediaItem;
import androidx.media3.exoplayer.ExoPlayer;
import androidx.media3.session.LibraryResult;
import androidx.media3.session.MediaLibraryService;
import androidx.media3.session.MediaSession;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.List;
public class PlaybackService extends MediaLibraryService {
MediaLibrarySession mediaLibrarySession = null;
MediaLibrarySession.Callback callback = new MediaLibrarySession.Callback() {
@NonNull
@Override
public ListenableFuture<LibraryResult<MediaItem>> onGetLibraryRoot(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @Nullable MediaLibraryService.LibraryParams params) {
return Futures.immediateFuture(LibraryResult.ofItem(Tree.genInstance().getTreeRoot(), params));
}
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetChildren(MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String parentId, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
List<MediaItem> children = Tree.genInstance().getNodeChildren(parentId);
if (!children.isEmpty()) {
return Futures.immediateFuture(LibraryResult.ofItemList(children, params));
}
return Futures.immediateFuture(LibraryResult.ofError(LibraryResult.RESULT_ERROR_BAD_VALUE));
}
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetSearchResult(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String query, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
return MediaLibrarySession.Callback.super.onGetSearchResult(session, browser, query, page, pageSize, params);
}
};
@Nullable
@Override
public MediaLibrarySession onGetSession(@NonNull MediaSession.ControllerInfo controllerInfo) {
return mediaLibrarySession;
}
@Override
public void onCreate() {
super.onCreate();
ExoPlayer player = new ExoPlayer.Builder(this).build();
mediaLibrarySession = new MediaLibraryService.MediaLibrarySession.Builder(this, player, callback).build();
}
@Override
public void onDestroy() {
super.onDestroy();
if (mediaLibrarySession != null) {
mediaLibrarySession.getPlayer().release();
mediaLibrarySession.release();
mediaLibrarySession = null;
}
}
}
搜索媒体库
首先还是去Tree中定义搜索的函数
List<MediaItem> search(String query) {
List<MediaItem> titleMatches = new ArrayList<>();
Object[] words = Arrays.stream(query.split(" ")).map(it -> it.trim().toLowerCase()).filter(it -> it.length() > 1).toArray();
titleNodes.keySet().forEach(title -> {
TreeNode treeNode = titleNodes.get(title);
for (Object word : words) {
boolean contains = title.contains((CharSequence) word);
if (contains) {
assert treeNode != null;
titleMatches.add(treeNode.node);
}
}
});
return titleMatches;
}
public static Map<String, TreeNode> titleNodes;
titleNodes = new HashMap<>();
titleNodes.put(MUSIC_TITLE, musicNode);
titleNodes.put(GAME_TITLE, gameNode);
titleNodes.put(STUDY_TITLE, studyNode);
@NonNull
@Override
public ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> onGetSearchResult(@NonNull MediaLibrarySession session, @NonNull MediaSession.ControllerInfo browser, @NonNull String query, int page, int pageSize, @Nullable MediaLibraryService.LibraryParams params) {
return Futures.immediateFuture(LibraryResult.ofItemList(Tree.genInstance().search(query), params));
}
MediaBrowser 搜索
private void searchMedia(String query) {
ListenableFuture<LibraryResult<ImmutableList<MediaItem>>> searchFuture = mediaBrowser.getSearchResult(query, 0, Integer.MAX_VALUE, null);
searchFuture.addListener(() -> {
try {
LibraryResult<ImmutableList<MediaItem>> immutableListLibraryResult = searchFuture.get();
ImmutableList<MediaItem> value = immutableListLibraryResult.value;
} catch (ExecutionException | InterruptedException e) {
throw new RuntimeException(e);
}
}, MoreExecutors.directExecutor());
}
搜索“ga”,可以查到“game”这个MediaItem
填坑中…
内容是真的多!