录音

/**
 * author:${dbf}
 * Date:2019/6/6
 * Description：
 */
public class MyAudioRecord {
    private String TAG = "MyAudioRecord";
    private MediaRecorder mr;
    private boolean isStart = false;
    private Handler handler;
    private long startTime;
    private String voicePathName;

    public MyAudioRecord(Handler handler) {
        this.handler = handler;
    }
}

public void startRecord() {
    if (isStart) {
        Log.d(TAG, "正在录制");
        return;
    }
    isStart = true;
    Log.d(TAG, "开始录制");
    if (mr == null) {
        File dir = new File(Environment.getExternalStorageDirectory(), "Avoicassistant");
        if (!dir.exists()) {
            dir.mkdirs();
        }
        File soundFile = new File(dir, System.currentTimeMillis() + ".amr");
        voicePathName = soundFile.getPath();
        Log.d(TAG, voicePathName);
        if (!soundFile.exists()) {
            try {
                soundFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        mr = new MediaRecorder();
        mr.setAudioSource(MediaRecorder.AudioSource.MIC); //音频输入源
        mr.setOutputFormat(MediaRecorder.OutputFormat.AMR_WB); //设置输出格式
        mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_WB); //设置编码格式
        mr.setAudioSamplingRate(16);
        mr.setOutputFile(soundFile.getAbsolutePath());
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {
                    mr.prepare();
                    mr.start(); //开始录制
                    startTime = System.currentTimeMillis();
                    updateMicStatus();
                } catch (IOException e) {
                    e.printStackTrace();java
                }
            }
        }.start();

    }

}

//停止录制，资源释放
    private void stopRecord() {
        if (mr != null) {
            Log.d(TAG, "录制完成");
            mr.stop();
            mr.release();
            mr = null;
            isStart = false;
        }
    }


    private void updateMicStatus() {
        long ctime = System.currentTimeMillis();
        if (ctime - startTime >= 5000) {
            stopRecord();
            Message message = Message.obtain(handler);
            message.what = 1;
            message.obj = voicePathName;
            handler.sendMessage(message);
            return;
        }
        if (mr != null) {
            int ratio = mr.getMaxAmplitude() / 600;
            int db = 0;// 分贝
            if (ratio > 1)
                db = (int) (20 * Math.log10(ratio));
            System.out.println("分贝值：" + db + " " + Math.log10(ratio));
            if (handler != null) {
//我对着手机说话声音最大的时候，db达到了35左右，
                handler.postDelayed(mUpdateMicStatusTimer, 200);
                Message message = Message.obtain(handler);
                message.what = 0;
                message.arg1 = db / 2;
//所以除了2，为的就是对应14张图片
                handler.sendMessage(message);
            }
        }
    }

    private Runnable mUpdateMicStatusTimer = new Runnable() {
        public void run() {
            updateMicStatus();
        }
    };