Android 实现录像机功能

2019-11-08 00:34:10

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录像功能

实现步骤： <1>将视频动画显示到SurfaceView控件上 <2>使用MediaRecorder类进行视频的录制

布局文件<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" 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" android:orientation="vertical" > <SurfaceView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/sv_main_surfaceview" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="开始" android:onClick="openkai" android:layout_weight="1" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="停止" android:onClick="stopgo" android:layout_weight="1" /> </LinearLayout></RelativeLayout>

Activity：

package com.example.PRcture;import android.media.MediaRecorder;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.SurfaceView;import android.view.View;public class MainActivity extends AppCompatActivity { private SurfaceView sv_main_surfaceview; private MediaRecorder mediaRecorder; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sv_main_surfaceview = (SurfaceView) findViewById(R.id.sv_main_surfaceview); mediaRecorder = new MediaRecorder(); } public void stopgo(View view){ mediaRecorder.stop();//停止刻录 } public void openkai(View view){ //重置 mediaRecorder.reset(); //设置视频Video和音频Audio的来源 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); mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //每秒3帧 mediaRecorder.setVideoFrameRate(3); //设置保存的路径 mediaRecorder.setOutputFile("mnt/sdcard/170223_"+System.currentTimeMillis()+".mp4"); //将画面展示到SurfaceView mediaRecorder.setPreviewDisplay(sv_main_surfaceview.getHolder().getSurface()); try { //预期准备 mediaRecorder.prepare(); //开始刻录 mediaRecorder.start(); } catch (Exception e) { e.printStackTrace(); } }}

需要添加的权限：

<uses-permission android:name="android.permission.RECORD_AUDIO"/> <uses-permission android:name="android.permission.CAMERA"></uses-permission> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

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