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我是Android的初學者，使用ExoPlayer時遇到問題。使用MP3格式的時候，但問題出現使用MP4或試圖播放視頻Exoplayer它並沒有表現出任何的事情，當我ExoPlayer效果很好視頻無法在exoPlayer中工作
這裏是我的活動
本次活動我initiallize mediaSession和初始化媒體播放器的exoplayer
package com.example.abdelmagied.bakingapp;
import android.app.NotificationManager;
import android.net.Uri;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import com.example.abdelmagied.bakingapp.recipeContents.steps;
import com.google.android.exoplayer2.DefaultLoadControl;
import com.google.android.exoplayer2.ExoPlaybackException;
import com.google.android.exoplayer2.ExoPlayer;
import com.google.android.exoplayer2.ExoPlayerFactory;
import com.google.android.exoplayer2.LoadControl;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.Timeline;
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
import com.google.android.exoplayer2.source.ExtractorMediaSource;
import com.google.android.exoplayer2.source.MediaSource;
import com.google.android.exoplayer2.source.TrackGroupArray;
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
import com.google.android.exoplayer2.trackselection.TrackSelector;
import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
import com.google.android.exoplayer2.util.Util;
public class stepDetailActivity extends AppCompatActivity implements ExoPlayer.EventListener {
private SimpleExoPlayer mExoPlayer;
private SimpleExoPlayerView mPlayerView;
private static MediaSessionCompat mMediaSession;
private PlaybackStateCompat.Builder mStateBuilder;
private NotificationManager mNotificationManager;
private static final String TAG = stepDetailActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_step_detail);
steps myrecipes = (steps) getIntent().getParcelableExtra("stepDetails");
mPlayerView = (SimpleExoPlayerView) findViewById(R.id.player);
initializeMediaSession();
initializePlayer(Uri.parse("https://d17h27t6h515a5.cloudfront.net/topher/2017/April/58ffd9cb_4-press-crumbs-in-pie-plate-creampie/4-press-crumbs-in-pie-plate-creampie.mp4"));
}
private void initializePlayer(Uri mediaUri) {
if (mExoPlayer == null) {
// Create an instance of the ExoPlayer.
TrackSelector trackSelector = new DefaultTrackSelector();
LoadControl loadControl = new DefaultLoadControl();
mExoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
mPlayerView.setPlayer(mExoPlayer);
// Set the ExoPlayer.EventListener to this activity.
mExoPlayer.addListener(this);
// Prepare the MediaSource.
String userAgent = Util.getUserAgent(this, "Bakingapp");
MediaSource mediaSource = new ExtractorMediaSource(mediaUri, new DefaultDataSourceFactory(
this, userAgent), new DefaultExtractorsFactory(), null, null);
mExoPlayer.prepare(mediaSource);
mExoPlayer.setPlayWhenReady(true);
}
}
/**
* Initializes the Media Session to be enabled with media buttons, transport controls, callbacks
* and media controller.
*/
private void initializeMediaSession() {
// Create a MediaSessionCompat.
mMediaSession = new MediaSessionCompat(this, TAG);
// Enable callbacks from MediaButtons and TransportControls.
mMediaSession.setFlags(
MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
// Do not let MediaButtons restart the player when the app is not visible.
mMediaSession.setMediaButtonReceiver(null);
// Set an initial PlaybackState with ACTION_PLAY, so media buttons can start the player.
mStateBuilder = new PlaybackStateCompat.Builder()
.setActions(
PlaybackStateCompat.ACTION_PLAY |
PlaybackStateCompat.ACTION_PAUSE |
PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS |
PlaybackStateCompat.ACTION_PLAY_PAUSE);
mMediaSession.setPlaybackState(mStateBuilder.build());
// MySessionCallback has methods that handle callbacks from a media controller.
mMediaSession.setCallback(new MySessionCallback());
// Start the Media Session since the activity is active.
mMediaSession.setActive(true);
}
@Override
public void onTimelineChanged(Timeline timeline, Object manifest) {
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
}
@Override
public void onLoadingChanged(boolean isLoading) {
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
if((playbackState == ExoPlayer.STATE_READY) && playWhenReady){
mStateBuilder.setState(PlaybackStateCompat.STATE_PLAYING,
mExoPlayer.getCurrentPosition(), 1f);
} else if((playbackState == ExoPlayer.STATE_READY)){
mStateBuilder.setState(PlaybackStateCompat.STATE_PAUSED,
mExoPlayer.getCurrentPosition(), 1f);
}
mMediaSession.setPlaybackState(mStateBuilder.build());
}
@Override
public void onPlayerError(ExoPlaybackException error) {
}
@Override
public void onPositionDiscontinuity() {
}
/**
* Media Session Callbacks, where all external clients control the player.
*/
private class MySessionCallback extends MediaSessionCompat.Callback {
@Override
public void onPlay() {
mExoPlayer.setPlayWhenReady(true);
}
@Override
public void onPause() {
mExoPlayer.setPlayWhenReady(false);
}
@Override
public void onSkipToPrevious() {
mExoPlayer.seekTo(0);
}
}
}
這裏是爲exoplayer的XML佈局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.example.abdelmagied.bakingapp.stepDetailActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/player"
android:layout_width="match_parent"
android:layout_height="300dp"
>
</com.google.android.exoplayer2.ui.SimpleExoPlayerView>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
</ScrollView>
</LinearLayout>
</RelativeLayout>