Google ExoPlayer guide

问题:

I am struggling to build basic app with ExoPlayer.

回答1:

First you need to add this in your build.gradle
compile 'com.google.android.exoplayer:exoplayer:r2.1.1'

1. Your Layout File

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     >     <com.google.android.exoplayer2.ui.SimpleExoPlayerView         android:id="@+id/player_view"         android:focusable="true"         android:layout_width="match_parent"         android:layout_height="match_parent"/> </RelativeLayout> 

2. Your Class File

public class ExoPlayerActivity extends AppCompatActivity implements ExoPlayer.EventListener {         SimpleExoPlayer player;         String path;        // it can be url of video for online streaming or a url of local video          @Override         protected void onCreate(@Nullable Bundle savedInstanceState) {             super.onCreate(savedInstanceState);             setContentView(R.layout.activity_exoplayer);              // set your path here             path=<your path>;              // 1. Create a default TrackSelector             BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();             TrackSelection.Factory videoTrackSelectionFactory =                     new AdaptiveVideoTrackSelection.Factory(bandwidthMeter);             TrackSelector trackSelector =                     new DefaultTrackSelector(videoTrackSelectionFactory);              // 2. Create a default LoadControl             LoadControl loadControl = new DefaultLoadControl();             // 3. Create the player             player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);              SimpleExoPlayerView playerView = (SimpleExoPlayerView) findViewById(R.id.player_view);             playerView.setPlayer(player);             playerView.setKeepScreenOn(true);             // Produces DataSource instances through which media data is loaded.             DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "ExoPlayer"));              // Produces Extractor instances for parsing the media data.             ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();              // This is the MediaSource representing the media to be played.             MediaSource videoSource = new ExtractorMediaSource(Uri.parse(path),                     dataSourceFactory, extractorsFactory, null, null);             // Prepare the player with the source.             player.addListener(this);             player.prepare(videoSource);             playerView.requestFocus();             player.setPlayWhenReady(true);      // to play video when ready. Use false to pause a video         }           @Override         protected void onPause() {             super.onPause();             if (player != null) {                 player.setPlayWhenReady(false); //to pause a video because now our video player is not in focus             }         }          @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) {             switch (playbackState) {                 case ExoPlayer.STATE_BUFFERING:                     //You can use progress dialog to show user that video is preparing or buffering so please wait                     break;                 case ExoPlayer.STATE_IDLE:                     //idle state                     break;                 case ExoPlayer.STATE_READY:                     // dismiss your dialog here because our video is ready to play now                     break;                 case ExoPlayer.STATE_ENDED:                     // do your processing after ending of video                     break;             }         }          @Override         public void onPlayerError(ExoPlaybackException error) {             // show user that something went wrong. I am showing dialog but you can use your way             AlertDialog.Builder adb = new AlertDialog.Builder(ExoPlayerActivity.this);             adb.setTitle("Could not able to stream video");             adb.setMessage("It seems that something is going wrong.\nPlease try again.");             adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {                 @Override                 public void onClick(DialogInterface dialog, int which) {                     dialog.dismiss();                     finish(); // take out user from this activity. you can skip this                 }             });             AlertDialog ad = adb.create();             ad.show();         }          @Override         public void onPositionDiscontinuity() {             //Video is not streaming properly             Log.d("Mayur", "Discontinuity");         }          @Override         protected void onDestroy() {             super.onDestroy();             player.release();   //it is important to release a player         }     } 

I think this is enough for beginner. Also keep in mind that this library's standard audio and video components rely on Android’s MediaCodec API, which was released in Android 4.1 (API level 16). So it will not work on android 4.0 and below.

文章来源: Google ExoPlayer guide