Andriod- 设置输出音频MediaRecorder

简单的录音功能，测试一下代码，直接贴：：：：


package com.example.testbuttomtoolbar.testbuttomtoolbar;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.media.MediaRecorder;
import android.os.Build;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

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


public class MainActivity extends Activity {

    private Button btnRecord=null;
    private Button btnStop=null;
    private SurfaceView mSurfaceView=null;
    private SurfaceHolder mSurfaceHolder=null;
    private MediaRecorder recorder=null;

    private File myRecAudioFile=null;
    private File dir=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mSurfaceView = (SurfaceView) findViewById(R.id.surfaceview);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.setKeepScreenOn(true);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        btnRecord=findViewById(R.id.record);
        btnStop=findViewById(R.id.stop);

        File defaultDir = Environment.getExternalStorageDirectory();
        String path = defaultDir.getAbsolutePath()+File.separator+"V"+File.separator;
        //创建文件夹存放视频
        dir = new File(path);
        if(!dir.exists()){
            dir.mkdir();
        }

        if (Build.VERSION.SDK_INT >= 23) {
            int REQUEST_CODE_CONTACT = 101;
            String[] permissions = {Manifest.permission.RECORD_AUDIO,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE};
            //验证是否许可权限
            for (String str : permissions) {
                if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
                    //申请权限
                    this.requestPermissions(permissions, REQUEST_CODE_CONTACT);
                    return;
                }
            }
        }

        recorder = new MediaRecorder();

        //开始录制视频
        btnRecord.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recorder();
            }
        });

        //停止录制视频
        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recorder.stop();
                recorder.reset();
                recorder.release();
                recorder=null;
            }
        });

    }

    public void recorder() {
        try {

            recorder = new MediaRecorder();

            recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
            recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
            recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

            recorder.setOutputFile("/mnt/sdcard/luyin2.3gp");

            recorder.prepare();

            recorder.start();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}