Question

我想在android 3.0中创建一个录音机应用程序。情况是，当我点击record按钮时，它必须开始记录，当我点击stop按钮时，它必须停止录制。

录制语音后，我想点击play按钮时播放录制的声音。当我点击stop playing按钮时，它必须停止播放。我曾尝试过录制语音的代码。但它以3gpp格式存储文件。所以它不是在ma设备上播放。所以我试图将outputformat更改为'AMR_NB'。但是当我点击停止按钮时它会崩溃。任何人都可以提供代码，否则PLZ帮助我通过编辑我的代码使其工作。这是我的助手班......

public class AudioRecorder {
final MediaRecorder recorder = new MediaRecorder();
  final String path;

  /**
   * Creates a new audio recording at the given path (relative to root of SD card).
   */
  public AudioRecorder(String path) {
    this.path = sanitizePath(path);
  }

  private String sanitizePath(String path) {
    if (!path.startsWith("/")) {
      path = "/" + path;
    }
    if (!path.contains(".")) {
      path += ".3gp";
    }
    return Environment.getExternalStorageDirectory().getAbsolutePath() + path;
  }

  /**
   * Starts a new recording.
   */
  public void start() 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.");
    }

    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile(path);
    recorder.prepare();
    recorder.start();
  }

  /**
   * Stops a recording that has been previously started.
   */
  public void stop() throws IOException {
    recorder.stop();
    recorder.release();
  }
}

这是我的活动课

public class audiorecording extends Activity {
private Button start;
private Button stop;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    start=(Button)findViewById(R.id.start);
    stop=(Button)findViewById(R.id.stop);
    final AudioRecorder recorder = new AudioRecorder("/audiometer/temp");



    start.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
             try {
                    recorder.start();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


        }
    })  ;       

    //….wait a while

        stop.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                try {
                    recorder.stop();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        })  ;

    }
}

Answer 1

您可以使用setOutputFormat (int output_format)

设置录制期间生成的输出文件的格式。在setAudioSource（）/ setVideoSource（）之后但在prepare（）之前调用它。建议在使用H.263视频编码器和AMR音频编码器时始终使用3GP格式。使用MPEG-4容器格式可能会使一些桌面播放器感到困惑。

<小时/> Audalyzer适用于Android的音频分析器

这是一款适用于Android的简单音频分析器。它将来自麦克风的声音读数显示为波形显示，频谱和dB仪表。 dB级别相对于设备的最大输入级别。

Android MediaRecorder

使用MediaRecorder录制音频的常见情况如下：

MediaRecorder recorder = new MediaRecorder();
 recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
 recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
 recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
 recorder.setOutputFile(PATH_NAME);
 recorder.prepare();
 recorder.start();   // Recording is now started
 ...
 recorder.stop();
 recorder.reset();   // You can reuse the object by going back to setAudioSource() step
 recorder.release(); // Now the object cannot be reused

Answer 2

放android.permission.RECORD_AUDIO

android.permission.WRITE_EXTERNAL_STORAGE

清单中的

？...

android录音机应用程序

2 个答案: