Android--录像功能的实现

xml布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="horizontal"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.g150825_android27.Main3Activity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="开始"        android:onClick="start"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="结束"        android:onClick="stop"        />    <SurfaceView        android:layout_width="match_parent"        android:layout_height="350dp"        android:id="@+id/sv_main_ssss"        /></LinearLayout>
package com.example.g150825_android27;import android.media.MediaRecorder;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.SurfaceView;import android.view.View;import java.io.IOException;public class Main3Activity extends AppCompatActivity {PRivate  SurfaceView sv_main_ssss;    private  MediaRecorder mediaRecorder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);      sv_main_ssss= (SurfaceView) findViewById(R.id.sv_main_ssss);         //实例化媒体录制        mediaRecorder=new MediaRecorder();    }    public void start(View view){       mediaRecorder.reset();   //设置视频和银屏来源        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);      //设置保存的格式        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);      //设置编码格式        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);        //设置音频的编码格式        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        mediaRecorder.setVideoFrameRate(3);        //保存的路劲        mediaRecorder.setOutputFile("mnt/sdcard/koo"+System.currentTimeMillis()+".mp4");        //将画面展示       mediaRecorder.setPreviewDisplay(sv_main_ssss.getHolder().getSurface());        //准备        try {            mediaRecorder.prepare();            mediaRecorder.start();        } catch (IOException e) {            e.printStackTrace();        }    }    public void stop(View view){        mediaRecorder.stop();    }}
   注意：添加权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>