我能够通过先从URL下载视频,然后使用自定义播放器播放来实现这一点。以下是我所做的步骤,如果其他人需要,可以参考一下:
1)获取需要播放的所有URL。
2)从本地存储中下载视频(按队列),并在首选项中保留标志(视频是否已下载)。
3)将URL分配给Adapter,在其中初始化处理视频播放的视频播放器控制器对象。
4)设置addOnScrollListener以检查当前可见的位置/视频,并检查视频是否已下载,如果是,则播放它。
以下是完整的代码:
MainActivity
public class MainActivity extends ActionBarActivity implements IVideoDownloadListener {
private static String TAG = "MainActivity";
private Context context;
private RecyclerView mRecyclerView;
private ProgressBar progressBar;
private VideosAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private ArrayList<Video> urls;
VideosDownloader videosDownloader;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = MainActivity.this;
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
urls = new ArrayList<Video>();
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new VideosAdapter(MainActivity.this, urls);
mRecyclerView.setAdapter(mAdapter);
videosDownloader = new VideosDownloader(context);
videosDownloader.setOnVideoDownloadListener(this);
if(Utils.hasConnection(context))
{
getVideoUrls();
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
LinearLayoutManager layoutManager = ((LinearLayoutManager) recyclerView.getLayoutManager());
int firstVisiblePosition = layoutManager.findFirstVisibleItemPosition();
int findFirstCompletelyVisibleItemPosition = layoutManager.findFirstCompletelyVisibleItemPosition();
Video video;
if (urls != null && urls.size() > 0)
{
if (findFirstCompletelyVisibleItemPosition >= 0) {
video = urls.get(findFirstCompletelyVisibleItemPosition);
mAdapter.videoPlayerController.setcurrentPositionOfItemToPlay(findFirstCompletelyVisibleItemPosition);
mAdapter.videoPlayerController.handlePlayBack(video);
}
else
{
video = urls.get(firstVisiblePosition);
mAdapter.videoPlayerController.setcurrentPositionOfItemToPlay(firstVisiblePosition);
mAdapter.videoPlayerController.handlePlayBack(video);
}
}
}
}
});
}
else
Toast.makeText(context, "No internet available", Toast.LENGTH_LONG).show();
}
@Override
public void onVideoDownloaded(Video video) {
mAdapter.videoPlayerController.handlePlayBack(video);
}
private void getVideoUrls()
{
Video video1 = new Video("0", "1", "http://techslides.com/demos/sample-videos/small.mp4");
urls.add(video1);
Video video2 = new Video("1", "2", "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4");
urls.add(video2);
Video video3 = new Video("2", "3", "http://sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4");
urls.add(video3);
Video video4 = new Video("3", "4", "http://dev.exiv2.org/attachments/341/video-2012-07-05-02-29-27.mp4");
urls.add(video4);
Video video5 = new Video("4", "5", "http://techslides.com/demos/sample-videos/small.mp4");
urls.add(video5);
Video video6 = new Video("5", "6", "http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4");
urls.add(video6);
Video video7 = new Video("6", "7", "http://sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4");
urls.add(video7);
mAdapter.notifyDataSetChanged();
progressBar.setVisibility(View.GONE);
videosDownloader.startVideosDownloading(urls);
}
}
视频适配器
public class VideosAdapter extends RecyclerView.Adapter<VideosAdapter.ViewHolder> {
private static String TAG = "VideosAdapter";
Context context;
private ArrayList<Video> urls;
public VideoPlayerController videoPlayerController;
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView textView;
public ProgressBar progressBar;
public RelativeLayout layout;
public ViewHolder(View v) {
super(v);
layout = (RelativeLayout) v.findViewById(R.id.layout);
textView = (TextView) v.findViewById(R.id.textView);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
}
}
public VideosAdapter(Context context, final ArrayList<Video> urls) {
this.context = context;
this.urls = urls;
videoPlayerController = new VideoPlayerController(context);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_main, parent, false);
Configuration configuration = context.getResources().getConfiguration();
int screenWidthDp = configuration.screenWidthDp;
int smallestScreenWidthDp = configuration.smallestScreenWidthDp;
ViewHolder viewHolder = new ViewHolder(v);
int screenWidthPixels = Utils.convertDpToPixel(screenWidthDp, context);
RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, screenWidthPixels);
viewHolder.layout.setLayoutParams(rel_btn);
return viewHolder;
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Video video = urls.get(position);
holder.textView.setText("Video " + video.getId());
final VideoPlayer videoPlayer = new VideoPlayer(context);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
videoPlayer.setLayoutParams(params);
holder.layout.addView(videoPlayer);
videoPlayerController.loadVideo(video, videoPlayer, holder.progressBar);
videoPlayer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
videoPlayer.changePlayState();
}
});
}
@Override
public void onViewRecycled(ViewHolder holder) {
super.onViewRecycled(holder);
Log.d(TAG, "onViewRecycledCalled");
holder.layout.removeAllViews();
}
@Override
public int getItemCount() {
return urls.size();
}
}
VideosDownloader
public class VideosDownloader {
private static String TAG = "VideosDownloader";
Context context;
FileCache fileCache;
IVideoDownloadListener iVideoDownloadListener;
public VideosDownloader(Context context) {
this.context = context;
fileCache = new FileCache(context);
}
public void startVideosDownloading(final ArrayList<Video> videosList)
{
Thread thread = new Thread(new Runnable() {
@Override
public void run()
{
for(int i=0; i<videosList.size(); i++)
{
final Video video = videosList.get(i);
String id = video.getId();
String url = video.getUrl();
String isVideoDownloaded = Utils.readPreferences(context, video.getUrl(), "false");
boolean isVideoAvailable = Boolean.valueOf(isVideoDownloaded);
if(!isVideoAvailable)
{
String downloadedPath = downloadVideo(url);
Activity activity = (Activity) context;
activity.runOnUiThread(new Runnable() {
@Override
public void run() {
Utils.savePreferences(context, video.getUrl(), "true");
iVideoDownloadListener.onVideoDownloaded(video);
}
});
}
}
}
});
thread.start();
}
private String downloadVideo(String urlStr)
{
URL url = null;
File file = null;
try
{
file = fileCache.getFile(urlStr);
url = new URL(urlStr);
long startTime = System.currentTimeMillis();
URLConnection ucon = null;
ucon = url.openConnection();
InputStream is = ucon.getInputStream();
BufferedInputStream inStream = new BufferedInputStream(is, 1024 * 5);
FileOutputStream outStream = new FileOutputStream(file);
byte[] buff = new byte[5 * 1024];
int len;
while ((len = inStream.read(buff)) != -1) {
outStream.write(buff, 0, len);
}
outStream.flush();
outStream.close();
inStream.close();
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return file.getAbsolutePath();
}
public void setOnVideoDownloadListener(IVideoDownloadListener iVideoDownloadListener) {
this.iVideoDownloadListener = iVideoDownloadListener;
}
}
VideoPlayerController
public class VideoPlayerController {
private static String TAG = "VideoPlayerController";
Context context;
FileCache fileCache;
int currentPositionOfItemToPlay = 0;
Video currentPlayingVideo;
private Map<String, VideoPlayer> videos = Collections.synchronizedMap(new WeakHashMap<String, VideoPlayer>());
private Map<String, ProgressBar> videosSpinner = Collections.synchronizedMap(new WeakHashMap<String, ProgressBar>());
public VideoPlayerController(Context context) {
this.context = context;
fileCache = new FileCache(context);
}
public void loadVideo(Video video, VideoPlayer videoPlayer, ProgressBar progressBar) {
videos.put(video.getIndexPosition(), videoPlayer);
videosSpinner.put(video.getIndexPosition(), progressBar);
handlePlayBack(video);
}
public void handlePlayBack(Video video)
{
if(isVideoDownloaded(video))
{
if(isVideoVisible(video))
{
playVideo(video);
}
}
}
private void playVideo(final Video video)
{
if(currentPlayingVideo != video)
{
if(videos.containsKey(video.getIndexPosition()))
{
final VideoPlayer videoPlayer2 = videos.get(video.getIndexPosition());
String localPath = fileCache.getFile(video.getUrl()).getAbsolutePath();
if(!videoPlayer2.isLoaded)
{
videoPlayer2.loadVideo(localPath, video);
videoPlayer2.setOnVideoPreparedListener(new IVideoPreparedListener() {
@Override
public void onVideoPrepared(Video mVideo) {
if(video.getIndexPosition() == mVideo.getIndexPosition())
{
if(currentPlayingVideo!=null)
{
VideoPlayer videoPlayer1 = videos.get(currentPlayingVideo.getIndexPosition());
videoPlayer1.pausePlay();
}
videoPlayer2.mp.start();
currentPlayingVideo = mVideo;
}
}
});
}
else
{
if(currentPlayingVideo!=null)
{
VideoPlayer videoPlayer1 = videos.get(currentPlayingVideo.getIndexPosition());
videoPlayer1.pausePlay();
}
boolean isStarted = videoPlayer2.startPlay();
{
}
currentPlayingVideo = video;
}
}
}
else
{
}
}
private boolean isVideoVisible(Video video) {
int positionOfVideo = Integer.valueOf(video.getIndexPosition());
if(currentPositionOfItemToPlay == positionOfVideo)
return true;
return false;
}
private boolean isVideoDownloaded(Video video) {
String isVideoDownloaded = Utils.readPreferences(context, video.getUrl(), "false");
boolean isVideoAvailable = Boolean.valueOf(isVideoDownloaded);
if(isVideoAvailable)
{
hideProgressSpinner(video);
return true;
}
showProgressSpinner(video);
return false;
}
private void showProgressSpinner(Video video) {
ProgressBar progressBar = videosSpinner.get(video.getIndexPosition());
if(progressBar!=null)
progressBar.setVisibility(View.VISIBLE);
}
private void hideProgressSpinner(Video video) {
ProgressBar progressBar = videosSpinner.get(video.getIndexPosition());
if(progressBar!=null && progressBar.isShown())
{
progressBar.setVisibility(View.GONE);
Log.i(TAG, "ProgressSpinner Hided Index: " + video.getIndexPosition());
}
}
public void setcurrentPositionOfItemToPlay(int mCurrentPositionOfItemToPlay) {
currentPositionOfItemToPlay = mCurrentPositionOfItemToPlay;
}
}
视频播放器
public class VideoPlayer extends TextureView implements TextureView.SurfaceTextureListener {
private static String TAG = "VideoPlayer";
boolean isFirstListItem;
boolean isLoaded;
boolean isMpPrepared;
IVideoPreparedListener iVideoPreparedListener;
Video video;
String url;
MediaPlayer mp;
Surface surface;
SurfaceTexture s;
public VideoPlayer(Context context) {
super(context);
}
public VideoPlayer(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public void loadVideo(String localPath, Video video) {
this.url = localPath;
this.video = video;
isLoaded = true;
if (this.isAvailable()) {
prepareVideo(getSurfaceTexture());
}
setSurfaceTextureListener(this);
}
@Override
public void onSurfaceTextureAvailable(final SurfaceTexture surface, int width, int height) {
isMpPrepared = false;
prepareVideo(surface);
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
if(mp!=null)
{
mp.stop();
mp.reset();
mp.release();
mp = null;
}
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
public void prepareVideo(SurfaceTexture t)
{
this.surface = new Surface(t);
mp = new MediaPlayer();
mp.setSurface(this.surface);
try {
mp.setDataSource(url);
mp.prepareAsync();
mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
isMpPrepared = true;
mp.setLooping(true);
iVideoPreparedListener.onVideoPrepared(video);
}
});
} catch (IllegalArgumentException e1) {
e1.printStackTrace();
} catch (SecurityException e1) {
e1.printStackTrace();
} catch (IllegalStateException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
}
try {
} catch (IllegalStateException e) {
e.printStackTrace();
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
}
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
}
public boolean startPlay()
{
if(mp!=null)
if(!mp.isPlaying())
{
mp.start();
return true;
}
return false;
}
public void pausePlay()
{
if(mp!=null)
mp.pause();
}
public void stopPlay()
{
if(mp!=null)
mp.stop();
}
public void changePlayState()
{
if(mp!=null)
{
if(mp.isPlaying())
mp.pause();
else
mp.start();
}
}
public void setOnVideoPreparedListener(IVideoPreparedListener iVideoPreparedListener) {
this.iVideoPreparedListener = iVideoPreparedListener;
}
}
IVideoDownloadListener
public interface IVideoDownloadListener {
public void onVideoDownloaded(Video video);
}
IVideoPreparedListener
public interface IVideoPreparedListener {
public void onVideoPrepared(Video video);
}