在 Android 上录制和保存音频 [英] recording and saving audio on Android

问题描述

我正在开发一个 android (2.2) 应用程序来录制音频.代码似乎运行良好，甚至将文件保存在 SD 卡上，但是当我尝试在 Mac 上播放音频文件时，没有任何反应.几乎就像文件是空的.我试过将它们保存为 .mp3 和 .wav，但没有成功.我的代码如下:

I'm developing an android (2.2) app to record audio. The code seems to run fine and even saves the files on the SD Card, but when I try and play the audio files on my Mac nothing happens. Almost like the files are empty. I've tried saving them as .mp3 and .wav but no luck. My code is below:

import java.io.File;
import java.io.IOException;

import android.media.MediaRecorder;
import android.os.Environment;

public class AudioRecorder {

    private MediaRecorder recorder = new MediaRecorder();

    private File outfile = null;

    public AudioRecorder(){}

    public void startRecording(String audioFile) throws IOException {
        String state = android.os.Environment.getExternalStorageState();
        if(!state.equals(android.os.Environment.MEDIA_MOUNTED))  {
            throw new IOException("SD Card is not mounted.  It is " + state + ".");
        }

        // make sure the directory we plan to store the recording in exists
        File directory = new File(path).getParentFile();
        if (!directory.exists() && !directory.mkdirs()) {
            throw new IOException("Path to file could not be created.");
        }
        try{
            File storageDir = new File(Environment
                    .getExternalStorageDirectory(), "/audio/");
            storageDir.mkdir();
            outfile=File.createTempFile(audioFile, ".wav",storageDir);
            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
            recorder.setOutputFile(outfile.getAbsolutePath());
        }catch(IOException e){
            e.printStackTrace();
        }

        try{
            recorder.prepare();
        }catch(IllegalStateException e){
            e.printStackTrace();
        }

        recorder.start();
        }

    public void stop() throws IOException {
        recorder.stop();
        recorder.release();
        }
}

我的活动:

/**
 * Recording Activity
 */


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import com.seekika.android.app.helpers.AudioRecorder;

import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.os.SystemClock;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;

public class Record extends Activity {

    private static final String TAG="RecordActivity";

    private int SETTINGS=Menu.FIRST;
    private int LOGOUT=Menu.FIRST + 1;
    private int EXIT=Menu.FIRST + 2;

    //components
    private Button mBtnStartRecording;
    private Button mBtnStopRecording;

    private Chronometer mChronometer;


    private String audioFileName="";
    final AudioRecorder recorder = new AudioRecorder();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recordstory);
        initComponents();
    }

    public void initComponents(){
        mChronometer=(Chronometer)findViewById(R.id.chrono);
        mBtnStopRecording=(Button)findViewById(R.id.btn_stop_recording);
        mBtnStopRecording.setEnabled(false);

        mBtnStopRecording.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                //stop timer
                stopRecording();
                //stop recording and save audio file to SD card

            }
        });

        mBtnStartRecording=(Button)findViewById(R.id.btn_start_recording);
        mBtnStartRecording.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                startRecording();
                mBtnStartRecording.setEnabled(false);
                mBtnStopRecording.setEnabled(true);
                //start recording audio
                //start timer

            }
        });

    }

    private void startRecording(){
        mChronometer.setBase(SystemClock.elapsedRealtime());
        mChronometer.start();


        try{
            String myRecording="Seekika-" + System.currentTimeMillis();
            Log.i(TAG, "Start Recording");
            recorder.startRecording(myRecording);
        }catch(IOException e){
            Log.e(TAG,"IOException error");
            e.printStackTrace();
        }

    }

    private void stopRecording(){
        mChronometer.stop();

        try{
            recorder.stop();
        }catch(IOException e){
            e.printStackTrace();
        }

    }


}

推荐答案

不知道你是否可以使用这个，但这对我有用:

Don' know if you can use this, but this works for me:

public void recordAudio(String fileName) {
    final MediaRecorder recorder = new MediaRecorder();
    ContentValues values = new ContentValues(3);
    values.put(MediaStore.MediaColumns.TITLE, fileName);
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
    recorder.setOutputFile("/sdcard/sound/" + fileName);
    try {
      recorder.prepare();
    } catch (Exception e){
        e.printStackTrace();
    }

    final ProgressDialog mProgressDialog = new ProgressDialog(MyActivity.this);
    mProgressDialog.setTitle(R.string.lbl_recording);
    mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
    mProgressDialog.setButton("Stop recording", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int whichButton) {
        mProgressDialog.dismiss();
        recorder.stop();
        recorder.release();
        }
    });

    mProgressDialog.setOnCancelListener(new DialogInterface.OnCancelListener(){
        public void onCancel(DialogInterface p1) {
            recorder.stop();
            recorder.release();
        }
    });
    recorder.start();
    mProgressDialog.show();
}

这篇关于在 Android 上录制和保存音频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！