Android Exoplayer，在屏幕旋转时恢复视频

万事须己运，他得非我贤。这篇文章主要讲述Android Exoplayer，在屏幕旋转时恢复视频相关的知识，希望能为你提供帮助。
我使用FragmentStatePagerAdapter来实例化一些片段，每个片段都包含SimpleExoPlayerView。在屏幕旋转，我希望视频自动恢复。我在saveInstantState中保存playbackPosition和currentWindow，并在onActivityCreated上恢复它们??。问题是当我旋转设备时，我正确恢复了playbackPosition，但是再次实例化了SimpleExoPlayerView并且视频没有自动恢复，似乎片段在屏幕旋转时再次被实例化
StepInfoActivity

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_step_info); ...mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), recipeModel.getSteps(), recipes_json); mViewPager = findViewById(R.id.container); mViewPager.setAdapter(mSectionsPagerAdapter); TabLayout tabLayout = findViewById(R.id.tabs); tabLayout.setupWithViewPager(mViewPager);

包含ExoPlayerView的片段

public class PlaceholderFragment extends Fragment {private static final String ARG_SECTION_NUMBER = "section_number"; SimpleExoPlayer player; long playbackPosition; int currentWindow; boolean playWhenReady = true; RecipeModel recipeModel; int received_index; @BindView(R.id.simple_exp_view) SimpleExoPlayerView playerView; @BindView(R.id.step_long_desc) TextView step_desc; @BindView(R.id.video_thumbnail) ImageView videoThumbnail; public PlaceholderFragment() { }@Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); String recipes_json = getArguments().getString(DetailFragment.STEP_INFO_EXTRA); received_index = getArguments().getInt(DetailFragment.STEP_INFO_POSITION, 0); recipeModel = new Gson().fromJson(recipes_json, RecipeModel.class); }@Override public void onSaveInstanceState(Bundle savedInstanceState) { super.onSaveInstanceState(savedInstanceState); savedInstanceState.putInt("current_window", currentWindow); savedInstanceState.putLong("play_back_pos", playbackPosition); }@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_step_info, container, false); ButterKnife.bind(this, rootView); setPlayerVisibility(); StepModel stepModel = recipeModel.getSteps().get(getArguments().getInt(ARG_SECTION_NUMBER) - 1); if (stepModel.getDescription() != null) { step_desc.setText(stepModel.getDescription()); }return rootView; }private void setPlayerVisibility() { StepModel stepModel = recipeModel.getSteps().get(getArguments().getInt(ARG_SECTION_NUMBER) - 1); if (stepModel.getVideoURL().isEmpty()) { playerView.setVisibility(View.GONE); } else if (!stepModel.getThumbnailURL().isEmpty()) { videoThumbnail.setVisibility(View.VISIBLE); Picasso.with(getContext()).load(stepModel.getThumbnailURL()).into(videoThumbnail); } else { playerView.setVisibility(View.VISIBLE); } }@Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (savedInstanceState != null) { playbackPosition = savedInstanceState.getLong("play_back_pos"); currentWindow = savedInstanceState.getInt("current_window"); }}@Override public void onStart() { super.onStart(); initializePlayer(); }@Override public void onResume() { super.onResume(); if ((Util.SDK_INT < = 23 || player == null)) { initializePlayer(); } }@Override public void onPause() { super.onPause(); if (Util.SDK_INT < = 23) { releasePlayer(); } }@Override public void onStop() { super.onStop(); if (Util.SDK_INT > 23) { releasePlayer(); } }private void releasePlayer() { if (player != null) { playbackPosition = player.getCurrentPosition(); currentWindow = player.getCurrentWindowIndex(); playWhenReady = player.getPlayWhenReady(); player.release(); player = null; } }private void initializePlayer() {if (player == null) {player = ExoPlayerFactory.newSimpleInstance( new DefaultRenderersFactory(getContext()), new DefaultTrackSelector(), new DefaultLoadControl()); playerView.setPlayer(player); player.setPlayWhenReady(playWhenReady); player.seekTo(currentWindow, playbackPosition); Uri uri = Uri.parse(recipeModel.getSteps().get(getArguments().getInt(ARG_SECTION_NUMBER) - 1).getVideoURL()); //todo MediaSource mediaSource = buildMediaSource(uri); player.prepare(mediaSource, true, false); videoThumbnail.setVisibility(View.GONE); } }private MediaSource buildMediaSource(Uri uri) { return new ExtractorMediaSource.Factory( new DefaultHttpDataSourceFactory("Baking_app")). createMediaSource(uri); }public static PlaceholderFragment newInstance(int sectionNumber, String recipeModel) { PlaceholderFragment fragment = new PlaceholderFragment(); Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); args.putString(DetailFragment.STEP_INFO_EXTRA, recipeModel); fragment.setArguments(args); return fragment; } }

FragmentStatePagerAdapter

public class SectionsPagerAdapter extends FragmentStatePagerAdapter { List< StepModel> steps; String recipeModel; public SectionsPagerAdapter(FragmentManager fm, List< StepModel> steps, String recipeModel) { super(fm); this.steps = steps; this.recipeModel = recipeModel; }@Override public Fragment getItem(int position) { return PlaceholderFragment.newInstance(position + 1, recipeModel); }@Override public int getCount() { return steps.size(); }@Override public CharSequence getPageTitle(int position) { if (position == 0) return "intro"; else return "step " + position; }@Override public Object instantiateItem(ViewGroup container, int position) { return super.instantiateItem(container, position); } }

答案【Android Exoplayer，在屏幕旋转时恢复视频】我设法通过在清单中添加一行来让视频继续播放：

< activity android:name=".MainActivity" android:label="@string/app_name" android:theme="@style/AppTheme.NoActionBar" this line -> android:configChanges="keyboardHidden|orientation|screenSize" android:icon="@drawable/appicon" android:launchMode="singleTop">