录制用户语音安卓

Question

我正在尝试制作一个应用程序，该应用程序应首先记录用户的声音，然后从录制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 - 它甚至录制了吗？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();
    }
}

}

而且我知道缩进不正确，因为我粘贴的代码很糟糕......您知道为什么此代码不起作用吗？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这一点和"QCMediaPlayer 媒体播放器不存在"，我读到这意味着我的平台不支持 QCMediaPlayer..？此代码是否录制文件而无法播放，或者无法录制文件？如何录制用户语音并处理保存的文件？

Answer 1

我相信问题出在playRecording().键入 MediaPlayer mPlayer = ... 时，它会创建一个新变量，并在该方法中具有作用域。您没有使用类MediaPlayer变量。尝试改变

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

自

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