Android MediaPlayer funktioniert gut in benutzerdefinierten Audio-Streaming-Anwendung bis zu Android 2.1, aber nicht in höheren Versionen

Den StreamingMediaPlayer - Klasse ist mit einem double-buffering-Technik zu bekommen, um Einschränkungen in Prä-1.2-releases von Android. Alle Produktions-releases von Android OS haben ein MediaPlayer, unterstützt das streaming von Medien(1). Ich würde empfehlen, das zu tun, anstatt mit diesem double-buffering-Technik zu bekommen, um das problem.

Android OS 2.2 ersetzt die alte media-player-code mit dem FrightCast Spieler, die wohl anders handeln in diesem Fall.

Den Zeilennummern in Ihrem stack-trace nicht die Karte, um die Datei, die Sie verknüpfen, so dass ich davon ausgehen es gibt eine andere version, die Sie tatsächlich verwenden. Ich werde zu erraten, dass NullPointerException wird berichtet von MediaPlayer aber weder die FileInputStream noch die zurückgegeben FileDescriptor werden kann null.

(1) Vor version 2.2 der media-player erkennen würde nicht ShoutCast-streams mit einem "EISIGEN/1.1" - version-header in der Antwort. Durch die Schaffung eines proxy, ersetzt diese mit "HTTP/1.1" können Sie lösen. Finden Sie die StreamProxy Klasse hier für ein Beispiel.

InformationsquelleAutor der Antwort jwadsack

ich bin mit diesem code, und führen 2.2 Obere version für streaming heruntergeladen.

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import android.content.Context;
import android.media.MediaPlayer;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;


public class StreamingMediaPlayer {
private static final int INTIAL_KB_BUFFER =  96*10;//assume 96kbps*10secs/8bits per    byte

private TextView textStreamed;

private ImageButton playButton;

private ProgressBar progressBar;
ProgressBar pb;
int audiofiletime=0;
private long mediaLengthInSeconds;
private int totalKbRead = 0;
int totalsize=0;
int numread;
int totalBytesRead = 0;
private final Handler handler = new Handler();
private MediaPlayer mediaPlayer;
private File downloadingMediaFile; 
private boolean isInterrupted;
private Context context;
private int counter = 0;

public StreamingMediaPlayer(Context  context,TextView textStreamed, ImageButton playButton, Button  streamButton,ProgressBar progressBar,ProgressBar pb) 
{
    this.context = context;
    this.textStreamed = textStreamed;
    this.playButton = playButton;
    this.progressBar = progressBar;
    this.pb=pb;
}

/**  
 * Progressivly download the media to a temporary location and update the MediaPlayer as new content becomes available.
 */  
public void startStreaming(final String mediaUrl) throws IOException {


    //this.mediaLengthInSeconds = 100;


    Runnable r = new Runnable() {   
        public void run() {   
            try {   
                downloadAudioIncrement(mediaUrl);
            } catch (IOException e) {
                Log.e(getClass().getName(), "Unable to initialize the MediaPlayer for fileUrl=" + mediaUrl, e);
                return;
            }   
        }   
    };   
    new Thread(r).start();
}

/**  
 * Download the url stream to a temporary location and then call the setDataSource  
 * for that local file
 */  
@SuppressWarnings({ "resource", "unused" })
public void downloadAudioIncrement(String mediaUrl) throws IOException {

    URLConnection cn = new URL(mediaUrl).openConnection();   
    cn.connect();   
    InputStream stream = cn.getInputStream();
    if (stream == null) {
        Log.e(getClass().getName(), "Unable to create InputStream for mediaUrl:" + mediaUrl);
    }

    ///////////////////save sdcard///////////////
    File direct = new File(Environment.getExternalStorageDirectory()+"/punya");

    if(!direct.exists()) {
        if(direct.mkdir()); //directory is created;
    }

    String[] files=mediaUrl.split("/");

    String fileName=files[files.length-1];
    fileName = fileName.replace(".m4a", ".rdo");


    //create a new file, to save the downloaded file 

    File file = new File(direct,fileName);

    @SuppressWarnings("resource")
    FileOutputStream fileOutput = new FileOutputStream(file);

    ///////////////////end/////////////////

    totalsize=cn.getContentLength();

    //mediaLengthInKb = 10000;

    downloadingMediaFile = new File(context.getCacheDir(),fileName);

    if (downloadingMediaFile.exists()) {
        downloadingMediaFile.delete();
    }

    FileOutputStream out = new FileOutputStream(downloadingMediaFile);   
    byte buf[] = new byte[16384];
    int incrementalBytesRead = 0;
    do {
        numread = stream.read(buf);   
        if (numread <= 0)   
            break;   
        out.write(buf, 0, numread);
        fileOutput.write(buf, 0, numread);
        totalBytesRead += numread;
        incrementalBytesRead += numread;
        totalKbRead = totalBytesRead/1000;
        //pb.setMax(100);
        //pb.setProgress(totalKbRead);

        testMediaBuffer();
        fireDataLoadUpdate();
    } while (validateNotInterrupted());   
    stream.close();
    if (validateNotInterrupted()) {
        fireDataFullyLoaded();
    }
}  

private boolean validateNotInterrupted() {
    if (isInterrupted) {
        if (mediaPlayer != null) {
            mediaPlayer.pause();
            //mediaPlayer.release();
        }
        return false;
    } else {
        return true;
    }
}


/**
 * Test whether we need to transfer buffered data to the MediaPlayer.
 * Interacting with MediaPlayer on non-main UI thread can causes crashes to so perform this using a Handler.
 */  
private void  testMediaBuffer() {
    Runnable updater = new Runnable() {
        public void run() {
            if (mediaPlayer == null) {
                // Only create the MediaPlayer once we have the minimum buffered data
                if ( totalKbRead >= INTIAL_KB_BUFFER) {
                    try {
                        startMediaPlayer();
                    } catch (Exception e) {
                        Log.e(getClass().getName(), "Error copying buffered conent.", e);               
                    }
                }
            } else if ( mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000 ){ 
                // NOTE:  The media player has stopped at the end so transfer any existing buffered data
                // We test for < 1second of data because the media player can stop when there is still
                // a few milliseconds of data left to play
                transferBufferToMediaPlayer();
            }
        }
    };
    handler.post(updater);
}

private void startMediaPlayer() {
    try {   
        //File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".m4a");

        //moveFile(downloadingMediaFile,bufferedFile);

        // Log.e(getClass().getName(),"Buffered File path: " + bufferedFile.getAbsolutePath());
        // Log.e(getClass().getName(),"Buffered File length: " + bufferedFile.length()+"");

        mediaPlayer = createMediaPlayer(downloadingMediaFile);

        //mediaPlayer.start();
        startPlayProgressUpdater();         
        //playButton.setEnabled(true);
        playButton.setVisibility(View.VISIBLE);
    } catch (IOException e) {
        Log.e(getClass().getName(), "Error initializing the MediaPlayer.", e);
        return;
    }   
}

private MediaPlayer createMediaPlayer(File mediaFile)
        throws IOException {
    MediaPlayer mPlayer = new MediaPlayer();
    mPlayer.setOnErrorListener(
            new MediaPlayer.OnErrorListener() {
                public boolean onError(MediaPlayer mp, int what, int extra) {
                    Log.e(getClass().getName(), "Error in MediaPlayer: (" + what +") with extra (" +extra +")" );
                    return false;
                }
            });

    FileInputStream fis = new FileInputStream(mediaFile);
    mPlayer.setDataSource(fis.getFD());
    mPlayer.prepare();
    return mPlayer;
}

/**
 * Transfer buffered data to the MediaPlayer.
 * NOTE: Interacting with a MediaPlayer on a non-main UI thread can cause thread-lock and crashes so 
 * this method should always be called using a Handler.
 */  
private void transferBufferToMediaPlayer() {
    try {

        boolean wasPlaying = mediaPlayer.isPlaying();
        int curPosition = mediaPlayer.getCurrentPosition();

        File oldBufferedFile = new File(context.getCacheDir(),"playingMedia" + counter + ".m4a");
        File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".m4a");

        bufferedFile.deleteOnExit();   
        moveFile(downloadingMediaFile,bufferedFile);

        //mediaPlayer.pause();
        mediaPlayer.release();

        mediaPlayer = createMediaPlayer(bufferedFile);
        mediaPlayer.seekTo(curPosition);

        boolean atEndOfFile = mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000;
        if (wasPlaying || atEndOfFile){
            mediaPlayer.start();
        }

        oldBufferedFile.delete();

    }catch (Exception e) {
        Log.e(getClass().getName(), "Error updating to newly loaded content.", e);                  
    }
}

private void fireDataLoadUpdate() {
    Runnable updater = new Runnable() {
        public void run() {

            //float loadProgress = ((float)totalBytesRead/(float)mediaLengthInKb);
            //float per = ((float)numread/mediaLengthInKb) * 100;
            float per = ((float)totalBytesRead/totalsize) * 100;
            textStreamed.setText((totalKbRead + " Kb (" + (int)per + "%)"));
            progressBar.setSecondaryProgress((int)(per));
            pb.setSecondaryProgress((int)(per));

        }
    };
    handler.post(updater);
}

private void fireDataFullyLoaded() {
    Runnable updater = new Runnable() { 
        public void run() {
            transferBufferToMediaPlayer();

            downloadingMediaFile.delete();
            textStreamed.setText(("Download completed" ));

        }
    };
    handler.post(updater);
}

public MediaPlayer getMediaPlayer() {
    return mediaPlayer;
}

public void startPlayProgressUpdater() {
    audiofiletime   =mediaPlayer.getDuration();
    float progress = (((float)mediaPlayer.getCurrentPosition()/ audiofiletime) * 100);
    progressBar.setProgress((int)(progress));
    //pb.setProgress((int)(progress*100));

    if (mediaPlayer.isPlaying()) {
        Runnable notification = new Runnable() {
            public void run() {
                startPlayProgressUpdater();
            }
        };
        handler.postDelayed(notification,1000);
    }
}    

public void interrupt() {
    playButton.setEnabled(false);
    isInterrupted = true;
    validateNotInterrupted();
}

/**
 *  Move the file in oldLocation to newLocation.
 */
public void moveFile(File   oldLocation, File   newLocation)
        throws IOException {

    if ( oldLocation.exists( )) {
        BufferedInputStream  reader = new BufferedInputStream( new FileInputStream(oldLocation) );
        BufferedOutputStream  writer = new BufferedOutputStream( new FileOutputStream(newLocation, false));
        try {
            byte[]  buff = new byte[5461];
            int numChars;
            while ( (numChars = reader.read(  buff, 0, buff.length ) ) != -1) {
                writer.write( buff, 0, numChars );
            }
        } catch( IOException ex ) {
            throw new IOException("IOException when transferring " + oldLocation.getPath() + " to " + newLocation.getPath());
        } finally {
            try {
                if ( reader != null ){                      
                    writer.close();
                    reader.close();
                }
            } catch( IOException ex ){
                Log.e(getClass().getName(),"Error closing files when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() ); 
            }
        }
    } else {
        throw new IOException("Old location does not exist when transferring " + oldLocation.getPath() + " to " + newLocation.getPath() );
    }
}
}

InformationsquelleAutor der Antwort