Zapisywanie dźwięku zapisywanie w formacie .wav w Androidzie

Question

import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import android.media.AudioFormat; 
import android.media.AudioRecord; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.os.Environment; 

import android.app.Activity; 
import android.view.Menu; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

    private static final int RECORDER_BPP = 16; 
    private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav"; 
    private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder"; 
    private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw"; 
    private static final int RECORDER_SAMPLERATE = 44100; 
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO; 
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT; 
    short[] audioData; 

    private AudioRecord recorder = null; 
    private int bufferSize = 0; 
    private Thread recordingThread = null; 
    private boolean isRecording = false; 
    Complex[] fftTempArray; 
    Complex[] fftArray; 
    int[] bufferData; 
    int bytesRecorded; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     setButtonHandlers(); 
     enableButtons(false); 

     bufferSize = AudioRecord.getMinBufferSize 
       (RECORDER_SAMPLERATE,RECORDER_CHANNELS,RECORDER_AUDIO_ENCODING)*3; 

     audioData = new short [bufferSize]; //short array that pcm data is put into. 
    } 

    private void setButtonHandlers() { 
     ((Button)findViewById(R.id.btnStart)).setOnClickListener(btnClick); 
     ((Button)findViewById(R.id.btnStop)).setOnClickListener(btnClick); 
    } 


    private void enableButton(int id,boolean isEnable){ 
     ((Button)findViewById(id)).setEnabled(isEnable); 
    } 

    private void enableButtons(boolean isRecording) { 
     enableButton(R.id.btnStart,!isRecording); 
     enableButton(R.id.btnStop,isRecording); 
    } 

    private String getFilename(){ 
     String filepath = Environment.getExternalStorageDirectory().getPath(); 
     File file = new File(filepath,AUDIO_RECORDER_FOLDER); 

     if (!file.exists()) { 
      file.mkdirs(); 
     } 

     return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + 
      AUDIO_RECORDER_FILE_EXT_WAV); 
    } 

    private String getTempFilename() { 
     String filepath = Environment.getExternalStorageDirectory().getPath(); 
     File file = new File(filepath,AUDIO_RECORDER_FOLDER); 

     if (!file.exists()) { 
      file.mkdirs(); 
     } 

     File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE); 

     if (tempFile.exists()) 
      tempFile.delete(); 

     return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE); 
    } 

    private void startRecording() { 
     recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, 
            RECORDER_SAMPLERATE, 
            RECORDER_CHANNELS, 
            RECORDER_AUDIO_ENCODING, 
            bufferSize); 
     int i = recorder.getState(); 
     if (i==1) 
      recorder.startRecording(); 

     isRecording = true; 

     recordingThread = new Thread(new Runnable() { 
      @Override 
      public void run() { 
       writeAudioDataToFile(); 
      } 
     }, "AudioRecorder Thread"); 

     recordingThread.start(); 
    } 

    private void writeAudioDataToFile() { 
     byte data[] = new byte[bufferSize]; 
     String filename = getTempFilename(); 
     FileOutputStream os = null; 

     try { 
      os = new FileOutputStream(filename); 
     } catch (FileNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

     int read = 0; 
     if (null != os) { 
      while(isRecording) { 
       read = recorder.read(data, 0, bufferSize); 
       if (read > 0){ 
       } 

       if (AudioRecord.ERROR_INVALID_OPERATION != read) { 
        try { 
         os.write(data); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 
       } 
      } 

      try { 
       os.close(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    private void stopRecording() { 
     if (null != recorder){ 
      isRecording = false; 

      int i = recorder.getState(); 
      if (i==1) 
       recorder.stop(); 
      recorder.release(); 

      recorder = null; 
      recordingThread = null; 
     } 

     copyWaveFile(getTempFilename(),getFilename()); 
     deleteTempFile(); 
    } 

    private void deleteTempFile() { 
     File file = new File(getTempFilename()); 
     file.delete(); 
    } 

    private void copyWaveFile(String inFilename,String outFilename){ 
     FileInputStream in = null; 
     FileOutputStream out = null; 
     long totalAudioLen = 0; 
     long totalDataLen = totalAudioLen + 36; 
     long longSampleRate = RECORDER_SAMPLERATE; 
     int channels = 2; 
     long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels/8; 

     byte[] data = new byte[bufferSize]; 

     try { 
      in = new FileInputStream(inFilename); 
      out = new FileOutputStream(outFilename); 
      totalAudioLen = in.getChannel().size(); 
      totalDataLen = totalAudioLen + 36; 

      AppLog.logString("File size: " + totalDataLen); 

      WriteWaveFileHeader(out, totalAudioLen, totalDataLen, 
          longSampleRate, channels, byteRate); 

      while(in.read(data) != -1) { 
       out.write(data); 
      } 

      in.close(); 
      out.close(); 
     } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 

    private void WriteWaveFileHeader(
     FileOutputStream out, long totalAudioLen, 
     long totalDataLen, long longSampleRate, int channels, 
     long byteRate) throws IOException 
    { 
     byte[] header = new byte[44]; 

     header[0] = 'R'; // RIFF/WAVE header 
     header[1] = 'I'; 
     header[2] = 'F'; 
     header[3] = 'F'; 
     header[4] = (byte) (totalDataLen & 0xff); 
     header[5] = (byte) ((totalDataLen >> 8) & 0xff); 
     header[6] = (byte) ((totalDataLen >> 16) & 0xff); 
     header[7] = (byte) ((totalDataLen >> 24) & 0xff); 
     header[8] = 'W'; 
     header[9] = 'A'; 
     header[10] = 'V'; 
     header[11] = 'E'; 
     header[12] = 'f'; // 'fmt ' chunk 
     header[13] = 'm'; 
     header[14] = 't'; 
     header[15] = ' '; 
     header[16] = 16; // 4 bytes: size of 'fmt ' chunk 
     header[17] = 0; 
     header[18] = 0; 
     header[19] = 0; 
     header[20] = 1; // format = 1 
     header[21] = 0; 
     header[22] = (byte) channels; 
     header[23] = 0; 
     header[24] = (byte) (longSampleRate & 0xff); 
     header[25] = (byte) ((longSampleRate >> 8) & 0xff); 
     header[26] = (byte) ((longSampleRate >> 16) & 0xff); 
     header[27] = (byte) ((longSampleRate >> 24) & 0xff); 
     header[28] = (byte) (byteRate & 0xff); 
     header[29] = (byte) ((byteRate >> 8) & 0xff); 
     header[30] = (byte) ((byteRate >> 16) & 0xff); 
     header[31] = (byte) ((byteRate >> 24) & 0xff); 
     header[32] = (byte) (2 * 16/8); // block align 
     header[33] = 0; 
     header[34] = RECORDER_BPP; // bits per sample 
     header[35] = 0; 
     header[36] = 'd'; 
     header[37] = 'a'; 
     header[38] = 't'; 
     header[39] = 'a'; 
     header[40] = (byte) (totalAudioLen & 0xff); 
     header[41] = (byte) ((totalAudioLen >> 8) & 0xff); 
     header[42] = (byte) ((totalAudioLen >> 16) & 0xff); 
     header[43] = (byte) ((totalAudioLen >> 24) & 0xff); 

     out.write(header, 0, 44); 
    } 

    private View.OnClickListener btnClick = new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      switch(v.getId()){ 
       case R.id.btnStart:{ 
        AppLog.logString("Start Recording"); 

        enableButtons(true); 
        startRecording(); 

        break; 
       } 
       case R.id.btnStop:{ 
        AppLog.logString("Start Recording"); 

        enableButtons(false); 
        stopRecording(); 

        break; 
       } 
      } 
     } 
    }; 
} 

Jestem nowy dla Androida. Użyłem tego kodu, aby zapisać nagrany dźwięk w formacie .wav, ale folder AudioRecorder, który jest wymieniony w tym kodzie, nie robi tego ". t utworzone. Chcę zapisać ten plik audio .wav w pamięci wewnętrznej.

Answer 1

Jeśli korzystasz z systemu Android w wersji 6.0 lub nowszej, musisz ustawić swoje uprawnienia ręcznie w ustawieniach telefonu. Lub poproś o udzielenie obu uprawnień RECORD_AUDIO i WRITE_EXTERNAL_STORAGE w czasie wykonywania.