我正在使用Exoplayer Demo应用程序，并希望预加载SD卡中的MP4视频。 我尝试了这篇文章中的实现，但它不起作用。我的exoplayer Demo中没有名为DemoUtil.java的类。 而是使用：
public static final Sample[] LOCAL_VIDEOS = new Sample[] {
new Sample("Some User friendly name of video 1",
"/mnt/sdcard/video1.mp4", Util.TYPE_OTHER),
};
我也无法使用他们提到的SampleChooserActivity.java代码片段。（一直给我错误）
相反，我使用了：
group = new SampleGroup("Local Videos");
group.addAll(Samples.LOCAL_VIDEOS);
sampleGroups.add(group);
我做错了什么？每个设备的文件路径都会改变吗？
我没有尝试过演示应用程序，但我已经成功创建了自己的本地音频文件播放示例，并在此处发布了它： https://github.com/nzkozar/ExoplayerExample
这里是主要部分，它完成了从文件Uri准备播放器的所有工作：
private void prepareExoPlayerFromFileUri(Uri uri){
exoPlayer = ExoPlayerFactory.newSimpleInstance(this, new DefaultTrackSelector(null), new DefaultLoadControl());
exoPlayer.addListener(eventListener);
DataSpec dataSpec = new DataSpec(uri);
final FileDataSource fileDataSource = new FileDataSource();
try {
fileDataSource.open(dataSpec);
} catch (FileDataSource.FileDataSourceException e) {
e.printStackTrace();
}
DataSource.Factory factory = new DataSource.Factory() {
@Override
public DataSource createDataSource() {
return fileDataSource;
}
};
MediaSource audioSource = new ExtractorMediaSource(fileDataSource.getUri(),
factory, new DefaultExtractorsFactory(), null, null);
exoPlayer.prepare(audioSource);
}
你可以像这样获取Uri：Uri.fromFile(file)
在按照上述方式准备好文件进行播放后，您只需要调用exoPlayer.setPlayWhenReady(true);开始播放。
对于视频文件，您可能只需要将一个SurfaceView附加到您的exoPlayer对象上，但我还没有真正使用ExoPlayer2完成这个操作。
ExtractorMediaSource已被弃用（SDK 29）。 - Damn VegetablesMediaPlayer 一样简单的一行API来播放媒体文件。我想我可能会寻找替代方案，唉。 - TheRealChx101想要使用 ExoPlayer 2 播放来自资产的 视频 的人，这里有一种方法：
String playerInfo = Util.getUserAgent(context, "ExoPlayerInfo");
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(
context, playerInfo
);
MediaSource mediaSource = new ExtractorMediaSource.Factory(dataSourceFactory)
.setExtractorsFactory(new DefaultExtractorsFactory())
.createMediaSource(Uri.parse("asset:///your_video.mov"));
player.prepare(mediaSource);
这个方法适用于我。请尝试以下步骤：
获取文件路径并启动播放器。
File myFile = new File(extStore.getAbsolutePath() + "/folder/videos/" + video_name);
videoUrl= String.valueOf(Uri.fromFile(myFile));
initializePlayer(videoUrl);
初始化播放器
private void initializePlayer(String videoUrl) {
player = ExoPlayerFactory.newSimpleInstance(
new DefaultRenderersFactory(getActivity()),
new DefaultTrackSelector(), new DefaultLoadControl());
playerView.setPlayer(player);
player.setPlayWhenReady(playWhenReady);
player.seekTo(currentWindow, playbackPosition);
Uri uri = Uri.parse(videoUrl);
MediaSource mediaSource = buildMediaSource(uri);
player.prepare(mediaSource, resetPositionBoolean, false);
}
private MediaSource buildMediaSource(Uri uri) {
return new ExtractorMediaSource.Factory(
new DefaultDataSourceFactory(getActivity(),"Exoplayer-local")).
createMediaSource(uri);
}
2.18.1中没有名为“ExoPlayerFactory”的类。 - Sambhav Khandelwal它通过以下方式加载文件来运行：assets/xyz.mp4
"file:/android_asset/xyz.mp4"
并且使用DefaultDataSourceFactory。在ExoPlayer 2.4.4上进行验证。
assets字段获取数据，这将起作用。但是，如果数据来自SD卡，则无法使用此方法。package com.studio.mattiaferigutti.exoplayertest
import android.annotation.SuppressLint
import android.net.Uri
import android.os.Bundle
import android.util.Log
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import com.google.android.exoplayer2.*
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
import com.google.android.exoplayer2.upstream.*
import com.google.android.exoplayer2.upstream.DataSource.Factory
import com.google.android.exoplayer2.util.Util
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity(), Player.EventListener {
private var player: SimpleExoPlayer? = null
private var playWhenReady = true
private var currentWindow = 0
private var playbackPosition: Long = 0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
public override fun onStart() {
super.onStart()
if (Util.SDK_INT > 23) {
initializePlayer("assets:///your_file.your_extension")
}
}
public override fun onResume() {
super.onResume()
hideSystemUi()
if (Util.SDK_INT <= 23 || player == null) {
initializePlayer("assets:///your_file.your_extension")
}
}
public override fun onPause() {
super.onPause()
if (Util.SDK_INT <= 23) {
releasePlayer()
}
}
public override fun onStop() {
super.onStop()
if (Util.SDK_INT > 23) {
releasePlayer()
}
}
private fun initializePlayer(path: String) {
if (player == null) {
val trackSelector = DefaultTrackSelector(this)
trackSelector.setParameters(
trackSelector.buildUponParameters().setMaxVideoSizeSd())
player = SimpleExoPlayer.Builder(this)
.setTrackSelector(trackSelector)
.build()
}
video_view?.player = player
video_view?.requestFocus()
val dataSourceFactory = Factory { AssetDataSource(this@MainActivity) }
val videoSource = ProgressiveMediaSource.Factory(dataSourceFactory)
.createMediaSource(Uri.parse(path))
player?.playWhenReady = playWhenReady
player?.seekTo(currentWindow, playbackPosition)
player?.addListener(this)
player?.prepare(videoSource)
}
private fun releasePlayer() {
if (player != null) {
playbackPosition = player?.currentPosition!!
currentWindow = player?.currentWindowIndex!!
playWhenReady = player?.playWhenReady!!
player?.removeListener(this)
player?.release()
player = null
}
}
/**
* set fullscreen
*/
@SuppressLint("InlinedApi")
private fun hideSystemUi() {
video_view?.systemUiVisibility = (View.SYSTEM_UI_FLAG_LOW_PROFILE
or View.SYSTEM_UI_FLAG_FULLSCREEN
or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)
}
override fun onPlayerError(error: ExoPlaybackException) {
super.onPlayerError(error)
//handle the error
}
override fun onPlayerStateChanged(playWhenReady: Boolean, playbackState: Int) {
val stateString: String = when (playbackState) {
ExoPlayer.STATE_IDLE -> "ExoPlayer.STATE_IDLE -"
ExoPlayer.STATE_BUFFERING -> "ExoPlayer.STATE_BUFFERING -"
ExoPlayer.STATE_READY -> "ExoPlayer.STATE_READY -"
ExoPlayer.STATE_ENDED -> "ExoPlayer.STATE_ENDED -"
else -> "UNKNOWN_STATE -"
}
Log.d(TAG, "changed state to " + stateString
+ " playWhenReady: " + playWhenReady)
}
companion object {
private val TAG = MainActivity::class.java.name
}
}
对于那些试图从< strong > res/raw*文件夹播放< strong >视频文件的人，这里有解决方案。请记住我使用的是< strong > ExoPlayer 的< strong > 2.8.0 版本。
public class MainActivity extends AppCompatActivity {
PlayerView playerView;
SimpleExoPlayer simpleExoPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
playerView=findViewById(R.id.playerView);
}
@Override
protected void onStart() {
simpleExoPlayer= ExoPlayerFactory.newSimpleInstance(this,new DefaultTrackSelector());
DefaultDataSourceFactory defaultDataSourceFactory=new DefaultDataSourceFactory(this, Util.getUserAgent(this,"YourApplicationName"));
simpleExoPlayer.setPlayWhenReady(true);
ExtractorMediaSource extractorMediaSource=new ExtractorMediaSource.Factory(defaultDataSourceFactory).createMediaSource(RawResourceDataSource.buildRawResourceUri(R.raw.video));
simpleExoPlayer.prepare(extractorMediaSource);
playerView.setPlayer(simpleExoPlayer);
super.onStart();
}
@Override
protected void onStop() {
playerView.setPlayer(null);
simpleExoPlayer.release();
simpleExoPlayer=null;
super.onStop();
}
}
public static final Sample[] LOCAL_VIDEOS = new Sample[] {
new Sample("test",
Environment.getExternalStorageDirectory()+"/Videos/test.mp4", Util.TYPE_OTHER),
};