我做了一个应用，可以播放手机里存储的歌曲，也可以播放流媒体音乐。但是安卓媒体播放器比exo播放器慢。所以我想用exo播放器替换我代码中的媒体播放器。谁能帮我把这段代码中的媒体播放器用exo播放器替换掉，用合适的方法好吗？
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.audiofx.AudioEffect;
import android.net.Uri;
import android.os.PowerManager;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;
import etwinkle.solutions.musico.service.playback.Playback;
import com.vaktech.musico.R;
import etwinkle.solutions.musico.util.PreferenceUtil;
public class MultiPlayer implements Playback, MediaPlayer.OnErrorListener, MediaPlayer.OnCompletionListener {
public static final String TAG = MultiPlayer.class.getSimpleName();
private MediaPlayer mCurrentMediaPlayer = new MediaPlayer();
private MediaPlayer mNextMediaPlayer;
private Context context;
@Nullable
private Playback.PlaybackCallbacks callbacks;
private boolean mIsInitialized = false;
/**
* Constructor of <code>MultiPlayer</code>
*/
public MultiPlayer(final Context context) {
this.context = context;
mCurrentMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
}
/**
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
* @return True if the <code>player</code> has been prepared and is
* ready to play, false otherwise
*/
@Override
public boolean setDataSource(@NonNull final String path) {
mIsInitialized = false;
mIsInitialized = setDataSourceImpl(mCurrentMediaPlayer, path);
if (mIsInitialized) {
setNextDataSource(null);
}
return mIsInitialized;
}
/**
* @param player The {@link MediaPlayer} to use
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
* @return True if the <code>player</code> has been prepared and is
* ready to play, false otherwise
*/
private boolean setDataSourceImpl(@NonNull final MediaPlayer player, @NonNull final String path) {
if (context == null) {
return false;
}
try {
player.reset();
player.setOnPreparedListener(null);
if (path.startsWith("content://")) {
player.setDataSource(context, Uri.parse(path));
} else {
player.setDataSource(path);
}
player.setAudioStreamType(AudioManager.STREAM_MUSIC);
player.prepare();
} catch (Exception e) {
return false;
}
player.setOnCompletionListener(this);
player.setOnErrorListener(this);
final Intent intent = new Intent(AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION);
intent.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, getAudioSessionId());
intent.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, context.getPackageName());
intent.putExtra(AudioEffect.EXTRA_CONTENT_TYPE, AudioEffect.CONTENT_TYPE_MUSIC);
context.sendBroadcast(intent);
return true;
}
/**
* Set the MediaPlayer to start when this MediaPlayer finishes playback.
*
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
*/
@Override
public void setNextDataSource(@Nullable final String path) {
if (context == null) {
return;
}
try {
mCurrentMediaPlayer.setNextMediaPlayer(null);
} catch (IllegalArgumentException e) {
Log.i(TAG, "Next media player is current one, continuing");
} catch (IllegalStateException e) {
Log.e(TAG, "Media player not initialized!");
return;
}
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
if (path == null) {
return;
}
if (PreferenceUtil.getInstance(context).gaplessPlayback()) {
mNextMediaPlayer = new MediaPlayer();
mNextMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
mNextMediaPlayer.setAudioSessionId(getAudioSessionId());
if (setDataSourceImpl(mNextMediaPlayer, path)) {
try {
mCurrentMediaPlayer.setNextMediaPlayer(mNextMediaPlayer);
} catch (@NonNull IllegalArgumentException | IllegalStateException e) {
Log.e(TAG, "setNextDataSource: setNextMediaPlayer()", e);
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
}
} else {
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
}
}
}
/**
* Sets the callbacks
*
* @param callbacks The callbacks to use
*/
@Override
public void setCallbacks(final Playback.PlaybackCallbacks callbacks) {
this.callbacks = callbacks;
}
/**
* @return True if the player is ready to go, false otherwise
*/
@Override
public boolean isInitialized() {
return mIsInitialized;
}
/**
* Starts or resumes playback.
*/
@Override
public boolean start() {
try {
mCurrentMediaPlayer.start();
return true;
} catch (IllegalStateException e) {
return false;
}
}
/**
* Resets the MediaPlayer to its uninitialized state.
*/
@Override
public void stop() {
mCurrentMediaPlayer.reset();
mIsInitialized = false;
}
/**
* Releases resources associated with this MediaPlayer object.
*/
@Override
public void release() {
stop();
mCurrentMediaPlayer.release();
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
}
}
/**
* Pauses playback. Call start() to resume.
*/
@Override
public boolean pause() {
try {
mCurrentMediaPlayer.pause();
return true;
} catch (IllegalStateException e) {
return false;
}
}
/**
* Checks whether the MultiPlayer is playing.
*/
@Override
public boolean isPlaying() {
return mIsInitialized && mCurrentMediaPlayer.isPlaying();
}
/**
* Gets the duration of the file.
*
* @return The duration in milliseconds
*/
@Override
public int duration() {
if (!mIsInitialized) {
return -1;
}
try {
return mCurrentMediaPlayer.getDuration();
} catch (IllegalStateException e) {
return -1;
}
}
/**
* Gets the current playback position.
*
* @return The current position in milliseconds
*/
@Override
public int position() {
if (!mIsInitialized) {
return -1;
}
try {
return mCurrentMediaPlayer.getCurrentPosition();
} catch (IllegalStateException e) {
return -1;
}
}
/**
* Gets the current playback position.
*
* @param whereto The offset in milliseconds from the start to seek to
* @return The offset in milliseconds from the start to seek to
*/
@Override
public int seek(final int whereto) {
try {
mCurrentMediaPlayer.seekTo(whereto);
return whereto;
} catch (IllegalStateException e) {
return -1;
}
}
@Override
public boolean setVolume(final float vol) {
try {
mCurrentMediaPlayer.setVolume(vol, vol);
return true;
} catch (IllegalStateException e) {
return false;
}
}
/**
* Sets the audio session ID.
*
* @param sessionId The audio session ID
*/
@Override
public boolean setAudioSessionId(final int sessionId) {
try {
mCurrentMediaPlayer.setAudioSessionId(sessionId);
return true;
} catch (@NonNull IllegalArgumentException | IllegalStateException e) {
return false;
}
}
/**
* Returns the audio session ID.
*
* @return The current audio session ID.
*/
@Override
public int getAudioSessionId() {
return mCurrentMediaPlayer.getAudioSessionId();
}
/**
* {@inheritDoc}
*/
@Override
public boolean onError(final MediaPlayer mp, final int what, final int extra) {
mIsInitialized = false;
mCurrentMediaPlayer.release();
mCurrentMediaPlayer = new MediaPlayer();
mCurrentMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
if (context != null) {
Toast.makeText(context, context.getResources().getString(R.string.unplayable_file), Toast.LENGTH_SHORT).show();
}
return false;
}
/**
* {@inheritDoc}
*/
@Override
public void onCompletion(final MediaPlayer mp) {
if (mp == mCurrentMediaPlayer && mNextMediaPlayer != null) {
mIsInitialized = false;
mCurrentMediaPlayer.release();
mCurrentMediaPlayer = mNextMediaPlayer;
mIsInitialized = true;
mNextMediaPlayer = null;
if (callbacks != null)
callbacks.onTrackWentToNext();
} else {
if (callbacks != null)
callbacks.onTrackEnded();
}
}
}
这是我做的代码。但是它没有工作。这里我先调用setDatSourceImpl()，然后再调用start()。但是歌曲没有被流传。
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.audiofx.AudioEffect;
import android.net.Uri;
import android.os.PowerManager;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;
import com.google.android.exoplayer2.DefaultLoadControl;
import com.google.android.exoplayer2.DefaultRenderersFactory;
import com.google.android.exoplayer2.ExoPlayer;
import com.google.android.exoplayer2.ExoPlayerFactory;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
import com.google.android.exoplayer2.extractor.ExtractorsFactory;
import com.google.android.exoplayer2.source.ExtractorMediaSource;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection;
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
import com.google.android.exoplayer2.trackselection.TrackSelection;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.upstream.BandwidthMeter;
import com.google.android.exoplayer2.upstream.DataSource;
import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.util.Util;
import com.vaktech.musico.R;
import etwinkle.solutions.musico.service.MultiPlayer;
import etwinkle.solutions.musico.service.playback.Playback;
import etwinkle.solutions.musico.util.PreferenceUtil;
/**
* Created by hasitha on 1/10/18.
*/
public class MultiPlayer implements Playback{
public static final String TAG = MultiPlayer.class.getSimpleName();
private SimpleExoPlayer mCurrentMediaPlayer;
private SimpleExoPlayer mNextMediaPlayer;
private BandwidthMeter bandwidthMeter;
private ExtractorsFactory extractorsFactory;
private TrackSelection.Factory trackSelectionFactory;
private TrackSelector trackSelector;
private DefaultBandwidthMeter defaultBandwidthMeter;
private DataSource.Factory dataSourceFactory;
private MediaSource mediaSource;
private Context context;
@Nullable
private Playback.PlaybackCallbacks callbacks;
private boolean mIsInitialized = false;
/**
* Constructor of <code>MultiPlayer</code>
*/
public MultiPlayer(final Context context) {
this.context = context;
mCurrentMediaPlayer = ExoPlayerFactory.newSimpleInstance(
new DefaultRenderersFactory(context),
new DefaultTrackSelector(), new DefaultLoadControl());
bandwidthMeter = new DefaultBandwidthMeter();
extractorsFactory = new DefaultExtractorsFactory();
trackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
trackSelector = new DefaultTrackSelector(trackSelectionFactory);
defaultBandwidthMeter = new DefaultBandwidthMeter();
dataSourceFactory = new DefaultDataSourceFactory(context,
Util.getUserAgent(context, "mediaPlayerSample"), defaultBandwidthMeter);
}
/**
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
* @return True if the <code>player</code> has been prepared and is
* ready to play, false otherwise
*/
@Override
public boolean setDataSource(@NonNull final String path) {
mIsInitialized = false;
mIsInitialized = setDataSourceImpl(mCurrentMediaPlayer, path);
if (mIsInitialized) {
setNextDataSource(null);
}
return mIsInitialized;
}
/**
* @param player The {@link MediaPlayer} to use
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
* @return True if the <code>player</code> has been prepared and is
* ready to play, false otherwise
*/
private boolean setDataSourceImpl(@NonNull ExoPlayer player, @NonNull final String path) {
if (context == null) {
return false;
}
try{
mediaSource = new ExtractorMediaSource(Uri.parse(path), dataSourceFactory, extractorsFactory, null, null);
}catch (IndexOutOfBoundsException in) {
mediaSource = new ExtractorMediaSource(Uri.parse(path), dataSourceFactory, extractorsFactory, null, null);
}
player = ExoPlayerFactory.newSimpleInstance(context, trackSelector);
player.prepare(mediaSource);
Log.d("Exceptions","Here he is ready");
final Intent intent = new Intent(AudioEffect.ACTION_OPEN_AUDIO_EFFECT_CONTROL_SESSION);
intent.putExtra(AudioEffect.EXTRA_AUDIO_SESSION, getAudioSessionId());
intent.putExtra(AudioEffect.EXTRA_PACKAGE_NAME, context.getPackageName());
intent.putExtra(AudioEffect.EXTRA_CONTENT_TYPE, AudioEffect.CONTENT_TYPE_MUSIC);
context.sendBroadcast(intent);
return true;
}
/**
* Set the MediaPlayer to start when this MediaPlayer finishes playback.
*
* @param path The path of the file, or the http/rtsp URL of the stream
* you want to play
*/
@Override
public void setNextDataSource(@Nullable final String path) {
if (context == null) {
return;
}
try {
//mCurrentMediaPlayer.setNextMediaPlayer(null);
} catch (IllegalArgumentException e) {
Log.i(TAG, "Next media player is current one, continuing");
} catch (IllegalStateException e) {
Log.e(TAG, "Media player not initialized!");
return;
}
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
if (path == null) {
return;
}
if (PreferenceUtil.getInstance(context).gaplessPlayback()) {
/*
mNextMediaPlayer = new MediaPlayer();
mNextMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
mNextMediaPlayer.setAudioSessionId(getAudioSessionId());
if (setDataSourceImpl(mNextMediaPlayer, path)) {
try {
mCurrentMediaPlayer.setNextMediaPlayer(mNextMediaPlayer);
} catch (@NonNull IllegalArgumentException | IllegalStateException e) {
Log.e(TAG, "setNextDataSource: setNextMediaPlayer()", e);
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
}
} else {
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
mNextMediaPlayer = null;
}
}
*/
}
}
/**
* Sets the callbacks
*
* @param callbacks The callbacks to use
*/
@Override
public void setCallbacks(final Playback.PlaybackCallbacks callbacks) {
this.callbacks = callbacks;
}
/**
* @return True if the player is ready to go, false otherwise
*/
@Override
public boolean isInitialized() {
return mIsInitialized;
}
/**
* Starts or resumes playback.
*/
@Override
public boolean start() {
try {
mCurrentMediaPlayer.setPlayWhenReady(true);
Log.d("Exceptions","Here Legal");
return true;
} catch (IllegalStateException e) {
Log.d("Exceptions","Here Illegal");
return false;
}
}
/**
* Resets the MediaPlayer to its uninitialized state.
*/
@Override
public void stop() {
mCurrentMediaPlayer.release();
mIsInitialized = false;
Log.d("Exceptions","Here stop please");
}
/**
* Releases resources associated with this MediaPlayer object.
*/
@Override
public void release() {
//stop();
mCurrentMediaPlayer.release();
if (mNextMediaPlayer != null) {
mNextMediaPlayer.release();
}
}
/**
* Pauses playback. Call start() to resume.
*/
@Override
public boolean pause() {
Log.d("Exceptions","Here pause please");
try {
mCurrentMediaPlayer.release();
return true;
} catch (IllegalStateException e) {
return false;
}
}
/**
* Checks whether the MultiPlayer is playing.
*/
@Override
public boolean isPlaying() {
return mIsInitialized && mCurrentMediaPlayer.getPlayWhenReady();
}
/**
* Gets the duration of the file.
*
* @return The duration in milliseconds
*/
@Override
public int duration() {
if (!mIsInitialized) {
return -1;
}
try {
long l = mCurrentMediaPlayer.getDuration();
return (int) l;
} catch (IllegalStateException e) {
return -1;
}
}
/**
* Gets the current playback position.
*
* @return The current position in milliseconds
*/
@Override
public int position() {
if (!mIsInitialized) {
return -1;
}
try {
long l = mCurrentMediaPlayer.getCurrentPosition();
return (int) l;
} catch (IllegalStateException e) {
return -1;
}
}
/**
* Gets the current playback position.
*
* @param whereto The offset in milliseconds from the start to seek to
* @return The offset in milliseconds from the start to seek to
*/
@Override
public int seek(final int whereto) {
try {
mCurrentMediaPlayer.seekTo(whereto);
return whereto;
} catch (IllegalStateException e) {
return -1;
}
}
@Override
public boolean setVolume(final float vol) {
try {
mCurrentMediaPlayer.setVolume(vol);
return true;
} catch (IllegalStateException e) {
return false;
}
}
/**
* Sets the audio session ID.
*
* @param sessionId The audio session ID
*/
@Override
public boolean setAudioSessionId(final int sessionId) {
try {
//mCurrentMediaPlayer.setA(sessionId);
return true;
} catch (@NonNull IllegalArgumentException | IllegalStateException e) {
return false;
}
}
/**
* Returns the audio session ID.
*
* @return The current audio session ID.
*/
@Override
public int getAudioSessionId() {
return mCurrentMediaPlayer.getAudioSessionId();
}
/**
* {@inheritDoc}
*/
/*
@Override
public boolean onError(final SimpleExoPlayer mp, final int what, final int extra) {
mIsInitialized = false;
mCurrentMediaPlayer.release();
mCurrentMediaPlayer = new MediaPlayer();
mCurrentMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
if (context != null) {
Toast.makeText(context, context.getResources().getString(R.string.unplayable_file), Toast.LENGTH_SHORT).show();
}
return false;
}
/**
* {@inheritDoc}
*/
/*
@Override
public void onCompletion(final MediaPlayer mp) {
if (mp == mCurrentMediaPlayer && mNextMediaPlayer != null) {
mIsInitialized = false;
mCurrentMediaPlayer.release();
mCurrentMediaPlayer = mNextMediaPlayer;
mIsInitialized = true;
mNextMediaPlayer = null;
if (callbacks != null)
callbacks.onTrackWentToNext();
} else {
if (callbacks != null)
callbacks.onTrackEnded();
}
}
*/
}
这是迟到的，但它可能会帮助其他人。你的exoplayer中缺少事件监听器。
private ExoPlayer.EventListener eventListener = new ExoPlayer.EventListener() {
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
Log.i(TAG, "onTracksChanged");
}
@Override
public void onLoadingChanged(boolean isLoading) {
Log.i(TAG, "onLoadingChanged");
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
Log.i(TAG, "onPlayerStateChanged: playWhenReady = " + String.valueOf(playWhenReady)
+ " playbackState = " + playbackState);
switch (playbackState) {
case ExoPlayer.STATE_ENDED:
Log.i(TAG, "Playback ended!");
//Stop playback and return to start position
setPlayPause(false);
mExoPlayer.seekTo(0);
if(callbacks!=null)
callbacks.onTrackEnded();
break;
case ExoPlayer.STATE_READY:
Log.i(TAG, "ExoPlayer ready! pos: " + mExoPlayer.getCurrentPosition()
+ " max: " + stringForTime((int) mExoPlayer.getDuration())+ " isPlaying");
break;
case ExoPlayer.STATE_BUFFERING:
Log.i(TAG, "Playback buffering!");
break;
case ExoPlayer.STATE_IDLE:
Log.i(TAG, "ExoPlayer idle!");
break;
}
}
@Override
public void onPlayerError(ExoPlaybackException error) {
Log.i(TAG, "onPlaybackError: " + error.getMessage());
}
};
private void setPlayPause(boolean play) {
mExoPlayer.setPlayWhenReady(play);
}
然后在构造函数中把这个监听器给你的exoplayer，像这样。
MultiPlayer(final Context context) {
.
.
mExoPlayer.addListener(eventListener);
.
.
}