带你入门的小demo（大言不惭）。详细介绍请去exoplayer website。

1.gradle中添加依赖

compile 'com.google.android.exoplayer:exoplayer:r2.0.4'
//权限<uses-permission android:name="android.permission.INTERNET"/>

2.布局

<LinearLayout
    android:id="@+id/main_layout"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/button"
        android:layout_height="wrap_content"
        android:layout_width="match_parent" 
        android:text="Button" />

    <Button
        android:id="@+id/button2"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Button2"/>

    <com.google.android.exoplayer2.ui.SimpleExoPlayerView
        android:id="@+id/view"
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>
</LinearLayout>

3.activity

public class MainActivity extends Activity { 
    Button btn, btn2; 
    SimpleExoPlayerView view; 

    @Override

    protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState); 
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        //        Remove titlebar 
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        //         Remove notificationbar
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.button);
        btn2 = (Button) findViewById(R.id.button2); 
        view = (SimpleExoPlayerView) findViewById(R.id.view);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                creteAPlayer();
            }
        }); 
        btn2.setOnClickListener(new View.OnClickListener() { 

            @Override
            public void onClick(View v) {
                playVideo(); 
            }
        });
    } 

    private void playVideo() {
        // Measures bandwidth during playback. Can be null if not required.
        DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        // Produces DataSource instances through which media data is loaded.
        DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(MainActivity.this, Util.getUserAgent(MainActivity.this, "snow"), bandwidthMeter);
        //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(mp4VideoUri, dataSourceFactory, extractorsFactory, null, null);
        //         Prepare the player with the source. 
        playe.prepare(videoSource);
        playe.setPlayWhenReady(true);
    } 
    SimpleExoPlayer playe;
    Uri mp4VideoUri = Uri.parse("your url");

    private void creteAPlayer() {
        Handler mainHandler = new Handler();
        BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(bandwidthMeter); 
        TrackSelector trackSelector = new DefaultTrackSelector(mainHandler, videoTrackSelectionFactory);
        //         2. Create a default LoadControl
        LoadControl loadControl = new DefaultLoadControl();
        //         3. Create the player 
        playe = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
        view.setPlayer(playe);
        ArrayList a = new ArrayList();
        Iterator i = a.iterator();
    }
}

以上。代码怎么在markdown中有序排列