ExoPlayer2のテスト

MainActivity.kt

package com.unuuu.exoplayer

import android.net.Uri
import android.os.Bundle
import android.os.Handler
import android.support.v7.app.AppCompatActivity
import com.google.android.exoplayer2.DefaultLoadControl
import com.google.android.exoplayer2.ExoPlayerFactory
import com.google.android.exoplayer2.SimpleExoPlayer
import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
import com.google.android.exoplayer2.source.ExtractorMediaSource
import com.google.android.exoplayer2.source.LoopingMediaSource
import com.google.android.exoplayer2.trackselection.AdaptiveVideoTrackSelection
import com.google.android.exoplayer2.trackselection.DefaultTrackSelector
import com.google.android.exoplayer2.trackselection.MappingTrackSelector
import com.google.android.exoplayer2.ui.SimpleExoPlayerView
import com.google.android.exoplayer2.upstream.*
import com.google.android.exoplayer2.util.Util

class MainActivity : AppCompatActivity() {

    private lateinit var mediaDataSourceFactory: DataSource.Factory
    private var mainHandler: Handler = Handler()
    private var player: SimpleExoPlayer? = null
    private val bandwidthMeter = DefaultBandwidthMeter()
    private var trackSelector: MappingTrackSelector? = null
    private var isPlayerNeedsSource: Boolean = false

    private lateinit var simpleExoPlayerView: SimpleExoPlayerView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mediaDataSourceFactory = buildDataSourceFactory(bandwidthMeter)
        simpleExoPlayerView = findViewById(R.id.activity_main_view_player) as SimpleExoPlayerView
        simpleExoPlayerView.requestFocus()
    }

    override fun onResume() {
        super.onResume()
        if (player == null) {
            initializePlayer()
        }
    }

    override fun onPause() {
        super.onPause()
        if (player != null) {
            releasePlayer()
        }
    }

    private fun buildDataSourceFactory(bandwidthMeter: DefaultBandwidthMeter): DataSource.Factory {
        return DefaultDataSourceFactory(this, bandwidthMeter, buildHttpDataSourceFactory(bandwidthMeter))
    }

    private fun buildHttpDataSourceFactory(bandwidthMeter: DefaultBandwidthMeter): HttpDataSource.Factory {
        return DefaultHttpDataSourceFactory(Util.getUserAgent(this, "ExoPlayer"), bandwidthMeter)
    }

    private fun initializePlayer() {
        if (player == null) {
            val videoTrackSelectionFactory = AdaptiveVideoTrackSelection.Factory(bandwidthMeter)
            // 第一引数をnullにするとnullチェックで落ちる
            trackSelector = DefaultTrackSelector(mainHandler, videoTrackSelectionFactory)
            player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, DefaultLoadControl())
            simpleExoPlayerView.useController = false
            simpleExoPlayerView.player = player
            player!!.playWhenReady = true
            isPlayerNeedsSource = true
        }
        if (isPlayerNeedsSource) {
            val uri = Uri.parse("動画のURL")
            val mediaSource = LoopingMediaSource(ExtractorMediaSource(uri, mediaDataSourceFactory, DefaultExtractorsFactory(), null, null))
            player?.prepare(mediaSource, true, false)
            isPlayerNeedsSource = false
        }
    }

    private fun releasePlayer() {
        if (player != null) {
            player!!.release()
            player = null
        }
    }
}