_Before using MediaRecorder, AudioRecord was used to record audio and found that the more complex and recorded audio was all harsh.It is possible that the file also needs a header.If you want to record, use MediaRecorder, it's easy to use.

_Recording requires privileges, android 6.0 and above require runtime privileges.

    <uses-permission android:name="android.permission.RECORD_AUDIO"

Sound recording

        MediaRecorder mediaRecorder = new MediaRecorder();
        //source
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        //Output Format
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        //Set Encoding
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            File file = new File(getExternalCacheDir().getAbsolutePath(), "a.mp3");
            //Location of file output
            mediaRecorder.setOutputFile(file.getAbsolutePath());
            mediaRecorder.prepare();
            //Start recording
            mediaRecorder.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

        //Stop recording
       mediaRecorder.stop();
       //release
       mediaRecorder.release();

play

1. MediaPlayer

                File file = new File(getExternalCacheDir().getAbsolutePath(), "a.mp3");
                MediaPlayer mediaPlayer = new MediaPlayer();
                try {
                    //Audio file address
                    mediaPlayer.setDataSource(file.getAbsolutePath());
                    mediaPlayer.prepare();
                    //play
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }

1. SoundPool
   _SoundPool can play multiple audio files at the same time.

        SoundPool  soundPool = new SoundPool.Builder()
                .setMaxStreams(maxStreams) //Set maximum concurrency value
                .build();
         //Load Resources
        int t = soundPool.load(this, R.raw.a, 0);
        //Parameter 1: Audio id
        //Parameter 2: Left channel 0.0-1.0
        //Parameter 3: Right channel 0.0-1.0
        //Parameter 4: Priority
        //Parameter 5: Play times, -1 bit cycle
        //Parameter 6: Play rate, 1 is normal, 0.5-2.0
        soundPool.play(t, 1, 1, 0, 0, (float) 2.0);