ExoPlayer 사용법

* Gradle

android {
    compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

repositories {
    google()
    jcenter()
}

dependencies {
    implementation 'com.google.android.exoplayer:exoplayer:2.8.4'
}

* AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<application android:usesCleartextTraffic="true" />

* PlayerActivity.java

public class PlayerActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();
    private static class EventListener extends Player.DefaultEventListener {
        @Override
        public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
            String stateString;
            switch (playbackState) {
                case Player.STATE_IDLE:
                    stateString = "ExoPlayer.STATE_IDLE";
                    break;
                case Player.STATE_BUFFERING:
                    stateString = "ExoPlayer.STATE_BUFFERING";
                    break;
                case Player.STATE_READY:
                    stateString = "ExoPlayer.STATE_READY";
                    break;
                case Player.STATE_ENDED:
                    stateString = "ExoPlayer.STATE_ENDED";
                    break;
                default:
                    stateString = "UNKNOWN_STATE";
                    break;
            }
            Log.d(TAG, "changed state to " + stateString + ", playWhenReady: " + playWhenReady);
        }
    }

    private static final DefaultBandwidthMeter BANDWIDTH_METER = new DefaultBandwidthMeter();
    private SimpleExoPlayer exoPlayer;
    private long playbackPosition;
    private int currentWindow;
    private boolean playWhenReady = true;

    private EventListener eventListener = new EventListener();

    String url = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_player);

        Intent intent = getIntent();
        String url = intent.getStringExtra("url");
        initPlayer(url);
    }

    @Override
    protected void onResume() {
        super.onResume();
        initPlayer(url);
    }

    @Override
    protected void onPause() {
        super.onPause();
        releasePlayer();
    }

    @Override
    protected void onStop() {
        super.onStop();
        releasePlayer();
    }

    private void initPlayer(String url) {
        if (url.isEmpty()) {
            Log.d(TAG, "url empty");
            return;
        }

        PlayerView playerView = findViewById(R.id.playerView);

        TrackSelection.Factory adaptiveTrackSelectionFactory = new AdaptiveTrackSelection.Factory(BANDWIDTH_METER);
        exoPlayer = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(this), new DefaultTrackSelector(adaptiveTrackSelectionFactory), new DefaultLoadControl());
        exoPlayer.addListener(new EventListener());


        MediaSource mediaSource = url.endsWith(".m3u8") ? buildMediaSourceHLS(Uri.parse(url)) : buildMediaSourceVideo(Uri.parse(url));
        exoPlayer.prepare(mediaSource, true, false);
        exoPlayer.setPlayWhenReady(playWhenReady);
        exoPlayer.seekTo(currentWindow, playbackPosition);
        playerView.setPlayer(exoPlayer);
    }

    private void releasePlayer() {
        if (exoPlayer != null) {
            playbackPosition = exoPlayer.getCurrentPosition();
            currentWindow = exoPlayer.getCurrentWindowIndex();
            playWhenReady = exoPlayer.getPlayWhenReady();
            exoPlayer.removeListener(eventListener);
            exoPlayer.release();
            exoPlayer = null;
        }
    }

    private MediaSource buildMediaSourceHLS(Uri uri) {
        String userAgent = System.getProperty("http.agent");
        Log.d(TAG, "UserAgent : " + userAgent);
        DataSource.Factory manifestDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent);
        HlsMediaSource hlsMediaSource = new HlsMediaSource.Factory(manifestDataSourceFactory).createMediaSource(uri);

        return new ConcatenatingMediaSource(hlsMediaSource);
    }

    private MediaSource buildMediaSourceVideo(Uri uri) {
        String userAgent = System.getProperty("http.agent");
        Log.d(TAG, "UserAgent : " + userAgent);
        ExtractorMediaSource videoSource = new ExtractorMediaSource.Factory(new DefaultHttpDataSourceFactory(TextUtils.isEmpty(userAgent) ? "DefaultHttpDataSourceFactory" : userAgent)).createMediaSource(uri);

        return new ConcatenatingMediaSource(videoSource);
    }

}

* activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#000000">

    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/playerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>