<user-permission android:name="android.permission.RECORD_AUDIO"/>

MediaPlayer mediaPlayer=new MediaPlayer();

mediaPlayer.setDataSource(recordFile.getPath());

                    mediaPlayer.prepare();

                    mediaPlayer.start();

                    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                        @Override

                        public void onCompletion(MediaPlayer mp) {

                            mp.reset();

                        }

                    });

package com.rexkell.mediaapplication;

import android.media.MediaPlayer;

import android.media.MediaRecorder;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import java.io.File;

import java.io.IOException;

/**

 * author: rexkell

 * explain:MediaRecord 录制音频

 */

public class MediaRecordActivity extends AppCompatActivity {

    private boolean isRecording=false;

    MediaRecorder mediaRecorder;

    MediaPlayer mediaPlayer;

    File  recordFile;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.ac_mediarecord);

        init();

    }

    public void init(){

        mediaRecorder=new MediaRecorder();

        //设置音频的来源

        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

        //设置音频的输出格式

        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_WB);

        //设置音频文件的编码

        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_WB);

        mediaPlayer=new MediaPlayer();

        recordFile=new File(getExternalFilesDir(null).getPath()+"/test.amr");

    }

    public void record(View v){

        isRecording=!isRecording;

        String text=isRecording?"暂停":"录制";

        ((Button)v).setText(text);

        if (isRecording){

            startRecord();

        }else {

            stopRecord();

        }

    }

    public void play(View v){

                if (mediaPlayer.isPlaying()){

                    return;

                }

                //设置数据源

                try {

                    mediaPlayer.setDataSource(recordFile.getPath());

                    mediaPlayer.prepare();

                    mediaPlayer.start();

                    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                        @Override

                        public void onCompletion(MediaPlayer mp) {

                            mp.reset();

                        }

                    });

                } catch (IOException e) {

                    e.printStackTrace();

                }

    }

    public void startRecord(){

        if (recordFile.exists()){

            recordFile.delete();

        }

            try {

                recordFile.createNewFile();

            } catch (IOException e) {

                e.printStackTrace();

            }

        mediaRecorder.setOutputFile(recordFile.getPath());

        try {

            mediaRecorder.prepare();

            mediaRecorder.start();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public void stopRecord(){

        if (mediaRecorder!=null&&isRecording){

            mediaRecorder.stop();

            mediaRecorder.release();

            mediaRecorder=null;

        }

    }

    public void stopPlay(){

         if(mediaPlayer!=null){

             mediaPlayer.stop();

             mediaPlayer.release();

             mediaPlayer=null;

         }

    }

}