RecoderUtils录音工具类

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

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

public class RecoderUtils {

   private final MediaRecorder recorde = new MediaRecorder();
   private final String path;
   private static int SAMPLE_RATE_IN_HZ = 8000;

   public RecoderUtils(String path) {
      this.path = sanitizePath(path);
   }

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

   /** 开始录音 */
   public void start() {
      if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
         return;
      }
      File directory = new File(path).getParentFile();
      if (!directory.exists() && !directory.mkdirs()) {
         return;
      }

      try {
         // 设置声音的来源
         recorde.setAudioSource(MediaRecorder.AudioSource.MIC);
         // 设置声音的输出格式
         recorde.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
         // 设置声音的编码格式
         recorde.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
         // 设置音频采样率
         recorde.setAudioSamplingRate(SAMPLE_RATE_IN_HZ);
         // 设置输出文件
         recorde.setOutputFile(path);
         // 准备录音
         recorde.prepare();
         // 开始录音
         recorde.start();
      } catch (IllegalStateException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }

   /** 停止录音 */
   public void stop() {
      try {
         // 停止录音
         recorde.stop();
         // 释放资源
         recorde.release();
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

   public double getAmplitude() {
      if (recorde != null) {
         return (recorde.getMaxAmplitude());
      } else
         return 0;
   }

}