下载视频并播放 [英] Download video along with playing
问题描述
我想实现在线视频播放功能以及下载功能.我的意思是应该使用相同的下载流来下载和播放视频，以便可以将视频保存为脱机使用，并避免两次播放和下载的数据成本分别达到两倍.
到目前为止，我已经使用asyncTask实现了视频下载并在OnPostExecute上播放了视频.以下是代码:
public class MainActivity extends AppCompatActivity {
private Button btnPlay;
private MediaPlayer player;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
outFilePath = getExternalFilesDir("/") + "/video.mp4";
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
prepareVideoView();
}
private VideoView videoView;
String videoPath = "http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_5mb.mp4";
String outFilePath = "";//
private void prepareVideoView() {
MediaController mediaController = new MediaController(this);
videoView = (VideoView) findViewById(R.id.videoView);
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
btnPlay = (Button) findViewById(R.id.btnPlayVideo);
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new VideoDownloader().execute(videoPath);
}
});
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
player = mp;
player.setOnVideoSizeChangedListener(new MediaPlayer.OnVideoSizeChangedListener() {
@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
Log.w("download","size changed");
}
});
}
});
}
File outFile;
class VideoDownloader extends AsyncTask<String, Integer, Void> {
@Override
protected Void doInBackground(String... params) {
outFile = new File(outFilePath);
FileOutputStream out = null;
BufferedInputStream input = null;
try {
out = new FileOutputStream(outFile,true);
try {
URL url = new URL(videoPath);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new RuntimeException("response is not http_ok");
}
int fileLength = connection.getContentLength();
input = new BufferedInputStream(connection.getInputStream());
byte data[] = new byte[2048];
long readBytes = 0;
int len;
boolean flag = true;
int readb = 0;
while ((len = input.read(data)) != -1) {
out.write(data,0,len);
readBytes += len;
// Following commented code is to play video along with downloading but not working.
/* readb += len;
if(readb > 1000000)
{
out.flush();
playVideo();
readb = 0;
}
*/
Log.w("download",(readBytes/1024)+"kb of "+(fileLength/1024)+"kb");
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null)
out.flush();
out.close();
if(input != null)
input.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Log.w("download", "Done");
playVideo();
}
}
private void playVideo() {
videoView.setVideoPath(outFile.getAbsolutePath());
videoView.start();
}
}
以上代码可以正常工作，可以下载然后播放.在DoInBackground的注释中有一些代码行，我试图实现自己的目标，但是却说不能播放视频".
有人知道解决方案吗?请帮助我.
借助Milos Fec的答案，我解决了此问题.
我必须创建两个线程，一个用于下载，另一个用于在socketServer上流式传输下载的内容，同时还要确保下载的数据和正在播放的数据同步.
我已将整个代码作为库放在github 在此处检查
编辑:此库不适用于所有类型的视频，在这些类型的视频服务器中，视频服务器通过将视频分成大块等等来限制下载.
我仅使用mp4进行了测试.此lib需要公共链接.
我在Android开发初期就致力于此工作，只是学习了本地服务器和远程服务器之间的同步.这个库有很多改进的余地，我没有做任何事情，因为还有其他选项可以满足相同的要求，而我也没有足够的时间来做其他事情.
I want to implement online video playing functionality along with downloading it. I mean same download stream should be used to download and play so that video can be saved for offline use and prevent two times data cost for playing and downloading separately.
So far i have implemented video downloading with asyncTask and play it on OnPostExecute. Following is the code:
public class MainActivity extends AppCompatActivity {
private Button btnPlay;
private MediaPlayer player;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
outFilePath = getExternalFilesDir("/") + "/video.mp4";
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
prepareVideoView();
}
private VideoView videoView;
String videoPath = "http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_5mb.mp4";
String outFilePath = "";//
private void prepareVideoView() {
MediaController mediaController = new MediaController(this);
videoView = (VideoView) findViewById(R.id.videoView);
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
btnPlay = (Button) findViewById(R.id.btnPlayVideo);
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new VideoDownloader().execute(videoPath);
}
});
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
player = mp;
player.setOnVideoSizeChangedListener(new MediaPlayer.OnVideoSizeChangedListener() {
@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
Log.w("download","size changed");
}
});
}
});
}
File outFile;
class VideoDownloader extends AsyncTask<String, Integer, Void> {
@Override
protected Void doInBackground(String... params) {
outFile = new File(outFilePath);
FileOutputStream out = null;
BufferedInputStream input = null;
try {
out = new FileOutputStream(outFile,true);
try {
URL url = new URL(videoPath);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new RuntimeException("response is not http_ok");
}
int fileLength = connection.getContentLength();
input = new BufferedInputStream(connection.getInputStream());
byte data[] = new byte[2048];
long readBytes = 0;
int len;
boolean flag = true;
int readb = 0;
while ((len = input.read(data)) != -1) {
out.write(data,0,len);
readBytes += len;
// Following commented code is to play video along with downloading but not working.
/* readb += len;
if(readb > 1000000)
{
out.flush();
playVideo();
readb = 0;
}
*/
Log.w("download",(readBytes/1024)+"kb of "+(fileLength/1024)+"kb");
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null)
out.flush();
out.close();
if(input != null)
input.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
Log.w("download", "Done");
playVideo();
}
}
private void playVideo() {
videoView.setVideoPath(outFile.getAbsolutePath());
videoView.start();
}
}
Above code is working properly to download and then play. There is some line of code in comment in DoInBackground that I tried to achieve my goal but it says "cant play video".
Anyone knows about solution? please help me.
With the help of Milos Fec's answer i solved this issue.
I had to create two thread one for downloading and another for streaming that downloaded content over a socketServer while taking care of synchronisation of data downloaded and data being played.
I have put the whole code as a library on github check here
EDIT: This lib does not work with all the types of videos where video servers imposes restrictions over downloading by breaking video into chunks and so on....
I have tested it with mp4 only. This lib requires a public link.
I worked on this on the early days of my Android development to just learn syncing between local server and remote server. There are a lot of room for improvements in this lib and I am not doing any because there are other options that fulfill the same requirement and I don't get enough time from my other stuff also.
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