Ich habe einen einfachen Player und Recorder. Alles funktioniert super, aber ich habe ein Problem. Ich möchte eine Suchleiste hinzufügen, um den Fortschritt bei der Wiedergabe von Aufzeichnungen zu sehen, und diese Suchleiste verwenden, um den Ort festzulegen, an dem der Spieler spielen soll. Ich habe onProgress aber ohne Wirkung. Das ist Code:

package com.example.recorder;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener
{
    private static final String LOG_TAG = "AudioRecordTest";
    private static String mFileName = null;
    private SeekBar seekBar;
    private MediaRecorder mRecorder = null;
    private Button startRecord, startPlaying, stopPlaying;
    private MediaPlayer   mPlayer = null;

    private void onRecord(boolean start) {
        if (start) {
            startRecording();
        } else {
            stopRecording();
        }
    }



    private void startPlaying() {
        if(mPlayer != null && mPlayer.isPlaying()){
            mPlayer.pause();
        } else if(mPlayer != null){
            mPlayer.start();
        }else{
        mPlayer = new MediaPlayer();
        try {

            mPlayer.setDataSource(mFileName);
            mPlayer.prepare();
            mPlayer.start();

        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }
        }

    }

    private void stopPlaying() {
        mPlayer.release();
        mPlayer = null;
        startPlaying.setText("Start playing");
    }

    private void pausePlaying(){
        if(mPlayer.isPlaying()){
            mPlayer.pause();
        } else {
          mPlayer.start();
        }
    }

    private void startRecording() {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }

        mRecorder.start();
    }

    private void stopRecording() {
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
    }



    public MainActivity() {
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        mFileName += "/audiorecordtest.3gp";
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        setContentView(R.layout.activity_main);

        startPlaying = (Button) findViewById(R.id.buttonStartPlay);
        stopPlaying = (Button) findViewById(R.id.buttonStopPlaying);
        startRecord = (Button) findViewById(R.id.buttonStartRecord);
        seekBar = (SeekBar) findViewById(R.id.seekBar);

        startRecord.setOnClickListener(new OnClickListener() {
            boolean mStartRecording = true;
            @Override
            public void onClick(View v) {
                onRecord(mStartRecording);
                if (mStartRecording) {
                    startRecord.setText("Stop recording");
                } else {
                    startRecord.setText("Start recording");
                }
                mStartRecording = !mStartRecording;

            }
        });  


        startPlaying.setOnClickListener(new OnClickListener() {
            boolean mStartPlaying = true;
            @Override
            public void onClick(View v) {
                //onPlay(mStartPlaying);
                startPlaying();
                if (mStartPlaying) {
                    startPlaying.setText("Stop playing");
                } else {
                    startPlaying.setText("Start playing");
                }
                mStartPlaying = !mStartPlaying;
            }
        });

        stopPlaying.setOnClickListener(new OnClickListener() {
            boolean mStartPlaying = true;
            @Override
            public void onClick(View v) {
                 stopPlaying();

            }
        });


    }

    @Override
    public void onPause() {
        super.onPause();
        if (mRecorder != null) {
            mRecorder.release();
            mRecorder = null;
        }

        if (mPlayer != null) {
            mPlayer.release();
            mPlayer = null;
        }
    }



    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        if(fromUser){
            mPlayer.seekTo(progress); 
            seekBar.setProgress(progress);
            }
            else{
             // the event was fired from code and you shouldn't call player.seekTo()
            }

    }



    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }



    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }
}

Irgendwelche Ideen, wie man mithilfe der Suchleiste den Fortschritt sehen und den Platz von der Aufzeichnung festlegen sollte?