那些遇到过的问题

Android中的SeekBar和媒体播放器

edi*_*233 52 android android-mediaplayer android-seekbar

我有一个简单的播放器和录音机.一切都很好,但有一个问题.我想添加搜索栏以查看播放记录的进度,并使用此搜索栏来设置播放器应该播放的位置.我有onProgress但没有效果.这是代码:

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

    }
}
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任何想法如何使用搜索栏来查看进度和从记录中设置位置应该发挥？

har*_*ore 144

要在两者之间创建"连接" SeekBar,MediaPlayer首先需要获取当前录制的最大持续时间并将其设置为搜索栏.

mSeekBar.setMax(mFileDuration/1000); // where mFileDuration is mMediaPlayer.getDuration();
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初始化之后MediaPlayer,例如按下播放按钮,你应该创建处理程序并发布runnable,这样你就可以用你喜欢的当前位置来更新你的SeekBar(在它UI thread自身中)MediaPlayer:

private Handler mHandler = new Handler();
//Make sure you update Seekbar on UI thread
MainActivity.this.runOnUiThread(new Runnable() {

    @Override
    public void run() {
        if(mMediaPlayer != null){
            int mCurrentPosition = mMediaPlayer.getCurrentPosition() / 1000;
            mSeekBar.setProgress(mCurrentPosition);
        }
        mHandler.postDelayed(this, 1000);
    }
});
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并每秒更新该值.

如果您需要MediaPlayer在用户拖动时更新位置,SeekBar则应添加OnSeekBarChangeListener到您的位置SeekBar并执行此操作:

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                
                if(mMediaPlayer != null && fromUser){
                    mMediaPlayer.seekTo(progress * 1000);
                }
            }
    });
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这应该是诀窍!:)

编辑: 我在你的代码中注意到的一件事,不要这样做:

public MainActivity() {
    mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
    mFileName += "/audiorecordtest.3gp";
}
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在你的所有初始化中onCreate();,不要创建你的构造函数Activity.

  • 是的,最好的方法.只是注意:如果你做int mCurrentPosition = mMediaPlayer.getCurrentPosition()/ 1000; 然后你可能还要这样做:mSeekBar.setMax(mFileDuration/1000); (17认同)
  • 这句话真的让我免于在if之前的滞后问题(mMediaPlayer!= null && fromUser)`非常感谢你+1 (3认同)
  • 还记得在媒体播放器暂停或到达音频文件末尾时删除可运行的文件，否则可运行的文件将继续运行，意识到这一点是因为我每次运行可运行的文件时都会进行记录，并获得大量日志。感谢您的解决方案，除此之外它工作得很好 (2认同)

Enr*_*man 9

我已成功使用本教程,理解起来非常简单: www.androidhive.info/2012/03/android-building-audio-player-tutorial/

这是有趣的部分:

/**
 * Update timer on seekbar
 * */
public void updateProgressBar() {
    mHandler.postDelayed(mUpdateTimeTask, 100);
}  

/**
 * Background Runnable thread
 * */
private Runnable mUpdateTimeTask = new Runnable() {
       public void run() {
           long totalDuration = mp.getDuration();
           long currentDuration = mp.getCurrentPosition();

           // Displaying Total Duration time
           songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
           // Displaying time completed playing
           songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));

           // Updating progress bar
           int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
           //Log.d("Progress", ""+progress);
           songProgressBar.setProgress(progress);

           // Running this thread after 100 milliseconds
           mHandler.postDelayed(this, 100);
       }
    };

/**
 *
 * */
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {

}

/**
 * When user starts moving the progress handler
 * */
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
    // remove message Handler from updating progress bar
    mHandler.removeCallbacks(mUpdateTimeTask);
}

/**
 * When user stops moving the progress hanlder
 * */
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
    mHandler.removeCallbacks(mUpdateTimeTask);
    int totalDuration = mp.getDuration();
    int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);

    // forward or backward to certain seconds
    mp.seekTo(currentPosition);

    // update timer progress again
    updateProgressBar();
}
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M. *_*ani 5

初始化MediaPlayerand后SeekBar，您可以执行以下操作：

 Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            mSeekBar.setProgress(mMediaPlayer.getCurrentPosition());
        }
    },0,1000);
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每秒更新SeekBar一次（1000ms）

对于更新MediaPlayer，如果用户拖动SeekBar，您必须添加OnSeekBarChangeListener到您的SeekBar：

mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
            mMediaPlayer.seekTo(i);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });
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