录制用户语音android

Question

我正在尝试制作一个应用程序，它应该首先记录用户的声音，然后从记录的文件中计算不同的东西（例如频谱）。我无法播放录制的文件（我找不到该文件-它甚至可以录制吗？）。这是我的代码：

package com.example.annik.puhesovellus;

import android.media.MediaPlayer; 
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import java.io.File;
import java.io.IOException;


public class DisplayAanitysIkkuna extends AppCompatActivity {
private String mFileName;
private MediaRecorder mRecorder;
private MediaPlayer mPlayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display_aanitys_ikkuna);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    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();
        }
    });
    mFileName = Environment.getExternalStorageDirectory()+"/audiorecorder.3gpp";

}
public void ButtonTapped(View view) {
    switch(view.getId()) {
        case R.id.start:
            try {
                beginRecording();
            }catch(Exception e){
                e.printStackTrace();
            }
            break;
        case R.id.stop:
            try {
                stopRecording();
            }catch(Exception e) {
                e.printStackTrace();
            }
            break;
        case R.id.play:
            try {
                playRecording();
            }catch(Exception e) {
                e.printStackTrace();
            }
            break;
        case R.id.stopPlaying:
            try {
                stopPlaying();
            }catch(Exception e) {
                e.printStackTrace();
            }
            break;

    }

}

private void stopPlaying() {
    mPlayer.release();
    mPlayer = null;
}

private void playRecording() throws Exception{
    ditchMediaPlayer();
    MediaPlayer mPlayer = MediaPlayer.create(this, Uri.parse(mFileName));
    mPlayer.start();

}

private void ditchMediaPlayer() {
    if(mPlayer != null) {
        try {
            mPlayer.release();
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}

private void beginRecording() throws IOException {
    ditchMediaRecorder();
    File outFile = new File(mFileName);

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

    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    mRecorder.setOutputFile(mFileName);
    mRecorder.prepare();
    mRecorder.start();
}

private void ditchMediaRecorder() {
    if(mRecorder != null) {
        mRecorder.release();

    }
}

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

}


}

我知道缩进不正确，因为我把代码粘贴得很糟糕……你知道为什么这段代码不能工作吗？它给出了两个错误：“应该已经设置了字幕控制器”，但我读到我不需要介意，“QCMediaPlayer媒体播放器不存在”，我读到这意味着我的平台不支持QCMedia播放器。。？这段代码是记录了一个文件却不能播放，还是无法记录文件？如何录制用户语音并处理保存的文件？

Answer 1

我认为问题出在playRecording（）中。当您键入MediaPlayer mPlayer=…时，它会在该方法中创建一个带有范围的新变量。您没有使用您的类MediaPlayer变量。尝试更改

MediaPlayer mPlayer = MediaPlayer.create(this, Uri.parse(mFileName));

到

mPlayer = MediaPlayer.create(this, Uri.parse(mFileName));