Android切换前后置摄像头并录制视频

项目需要对微信的视频模块也看了一下，在此就对这块进行了一个开发。首先给出效果图



首先给出java代码

/**
* RecordActivity.java
* 版权所有(C) 2013
* 创建:cuiran 2013-10-15 下午3:20:45
*/
package com.app931.oa.activity.video;

import java.io.IOException;
import java.util.List;

import com.app931.oa.R;
import com.app931.oa.util.LogsUtil;
import com.app931.oa.util.SupportedSizesReflect;

import android.app.Activity;
import android.content.Context;

import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Size;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.view.SurfaceHolder.Callback;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

/**
* TODO
* @author cuiran
* @version 1.0.0
*/
public class RecordActivity extends Activity implements Callback,MediaPlayer.OnPreparedListener, OnBufferingUpdateListener,
OnCompletionListener
{
private static final String TAG="RecordActivity";
private String videoPath="/sdcard/love.3gp";

private MediaRecorder mediarecorder;// 录制视频的类
private MediaPlayer mediaPlayer;//播放视频的类
private SurfaceView surfaceview;// 显示视频的控件
private  Camera camera;
//实现这个接口的Callback接口
private SurfaceHolder surfaceHolder;
/**
* 是否正在录制true录制中 false未录制
*/
private boolean isRecord=false;

public boolean isCameraBack=true;

private ImageView recordIv;
private ImageView recordPlayIv;

private int mVideoWidth;
private int mVideoHeight;
int cameraCount = 0;

private int cameraPosition = 1;//0代表前置摄像头，1代表后置摄像头

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_video_record1);
setTitleStr("");

// 选择支持半透明模式,在有surfaceview的activity中使用。
getWindow().setFormat(PixelFormat.TRANSLUCENT);

initView();

}

/**
* TODO
*/
private void initView() {
// TODO Auto-generated method stub

surfaceview = (SurfaceView) this.findViewById(R.id.surfaceview);
recordIv=(ImageView)findViewById(R.id.recordIv);
recordPlayIv=(ImageView)findViewById(R.id.recordPlayIv);

SurfaceHolder holder = surfaceview.getHolder();// 取得holder
holder.addCallback(this); // holder加入回调接口
// setType必须设置，要不出错.
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}
/**
* 播放视频
* TODO
* @param v
*/
public void playVideo(View v){
recordPlayIv.setVisibility(View.GONE);
try {
mediaPlayer=new MediaPlayer();
mediaPlayer.setDataSource(videoPath);
mediaPlayer.setDisplay(surfaceHolder);
mediaPlayer.prepareAsync();

} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

mediaPlayer.setOnBufferingUpdateListener(this);
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

}

/**
* 开始录制/停止录制
* TODO
* @param v
*/
public void recordVideo(View v){
if(isRecord){
isRecord=false;
recordIv.setImageResource(R.drawable.video_recorder_start_btn_nor);
recordPlayIv.setVisibility(View.VISIBLE);
if (mediarecorder != null) {
// 停止录制
mediarecorder.stop();
// 释放资源
mediarecorder.release();
mediarecorder = null;
}
if(camera!=null){
camera.release();
}
}else{
isRecord=true;
recordIv.setImageResource(R.drawable.video_recorder_recording_btn);
recordPlayIv.setVisibility(View.GONE);
mediarecorder = new MediaRecorder();// 创建mediarecorder对象
//			// 从麦克风源进行录音
//			mediarecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
//			// 设置输出格式
//			mediarecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
//			// 设置编码格式
//			mediarecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
/**
* 设置竖着录制
*/
if(camera!=null){
camera.release();
}

if(cameraPosition==1){
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);//打开摄像头
//				 camera = Camera.open(cameraPosition);//打开摄像头
//		         Camera.Parameters parameters = camera.getParameters();
//		         camera.setDisplayOrientation(90);

//		         camera.setParameters(parameters);

camera=deal(camera);
mediarecorder.setOrientationHint(90);//视频旋转90度

}else{
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);//打开摄像头
Camera.Parameters parameters = camera.getParameters();
camera.setDisplayOrientation(90);
camera.setParameters(parameters);
mediarecorder.setOrientationHint(270);//视频旋转90度
}

camera.unlock();

mediarecorder.setCamera(camera);

// 设置录制视频源为Camera(相机)
mediarecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
// 设置录制完成后视频的封装格式THREE_GPP为3gp.MPEG_4为mp4
mediarecorder
.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
// 设置录制的视频编码h263 h264
mediarecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
// 设置视频录制的分辨率。必须放在设置编码和格式的后面，否则报错
mediarecorder.setVideoSize(176, 144);
// 设置录制的视频帧率。必须放在设置编码和格式的后面，否则报错
mediarecorder.setVideoFrameRate(20);

mediarecorder.setPreviewDisplay(surfaceHolder.getSurface());
// 设置视频文件输出的路径
mediarecorder.setOutputFile(videoPath);
try {
// 准备录制
mediarecorder.prepare();
mediarecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}

protected void setTitleStr(String str) {
TextView titleText = (TextView) findViewById(R.id.common_title_text);
titleText.setText(str.trim());

Button left_button=(Button)findViewById(R.id.left_button);
left_button.setVisibility(View.VISIBLE);
left_button.setText("返回");
left_button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
back();
}
});
Button right_button=(Button)findViewById(R.id.right_button);
right_button.setVisibility(View.VISIBLE);
right_button.setText("");
right_button.setBackgroundResource(R.drawable.btn_video_switch_bg);
right_button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
cameraCount=Camera.getNumberOfCameras();
if(isCameraBack){
isCameraBack=false;
}else{
isCameraBack=true;
}
//					SurfaceHolder holder = surfaceview.getHolder();// 取得holder
//					holder.addCallback(RecordActivity.this); // holder加入回调接口
//					LogsUtil.i(TAG, "cameraCount="+cameraCount);

int cameraCount = 0;
CameraInfo cameraInfo = new CameraInfo();
cameraCount = Camera.getNumberOfCameras();//得到摄像头的个数

for(int i = 0; i < cameraCount; i++) {

Camera.getCameraInfo(i, cameraInfo);//得到每一个摄像头的信息
if(cameraPosition == 1) {
//现在是后置，变更为前置
if(cameraInfo.facing  == Camera.CameraInfo.CAMERA_FACING_FRONT) {//代表摄像头的方位，CAMERA_FACING_FRONT前置      CAMERA_FACING_BACK后置

camera.stopPreview();//停掉原来摄像头的预览
camera.release();//释放资源
camera = null;//取消原来摄像头
camera = Camera.open(i);//打开当前选中的摄像头
try {
deal(camera);
camera.setPreviewDisplay(surfaceHolder);//通过surfaceview显示取景画面
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();//开始预览
cameraPosition = 0;
break;
}
} else {
//现在是前置， 变更为后置
if(cameraInfo.facing  == Camera.CameraInfo.CAMERA_FACING_BACK) {//代表摄像头的方位，CAMERA_FACING_FRONT前置      CAMERA_FACING_BACK后置
camera.stopPreview();//停掉原来摄像头的预览
camera.release();//释放资源
camera = null;//取消原来摄像头
camera = Camera.open(i);//打开当前选中的摄像头
try {
deal(camera);
camera.setPreviewDisplay(surfaceHolder);//通过surfaceview显示取景画面
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
camera.startPreview();//开始预览
cameraPosition = 1;
break;
}
}

}

}
});

}

/**
* 返回
*<b>function:</b>
*@author cuiran
*@createDate 2013-8-20 下午2:22:48
*/
public void back(){

finish();

}

public Camera deal(Camera camera){
//设置camera预览的角度，因为默认图片是倾斜90度的
camera.setDisplayOrientation(90);

Size pictureSize=null;
Size previewSize=null;
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewFrameRate(5);
//设置旋转代码
parameters.setRotation(90);
//			parameters.setPictureFormat(PixelFormat.JPEG);

List<Size> supportedPictureSizes
= SupportedSizesReflect.getSupportedPictureSizes(parameters);
List<Size> supportedPreviewSizes
= SupportedSizesReflect.getSupportedPreviewSizes(parameters);

if ( supportedPictureSizes != null &&
supportedPreviewSizes != null &&
supportedPictureSizes.size() > 0 &&
supportedPreviewSizes.size() > 0) {

//2.x
pictureSize = supportedPictureSizes.get(0);

int maxSize = 1280;
if(maxSize > 0){
for(Size size : supportedPictureSizes){
if(maxSize >= Math.max(size.width,size.height)){
pictureSize = size;
break;
}
}
}

WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
DisplayMetrics displayMetrics = new DisplayMetrics();
display.getMetrics(displayMetrics);

previewSize = getOptimalPreviewSize(
supportedPreviewSizes,
display.getWidth(),
display.getHeight());

parameters.setPictureSize(pictureSize.width, pictureSize.height);
parameters.setPreviewSize(previewSize.width, previewSize.height);

}
camera.setParameters(parameters);
return camera;
}
/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceChanged(android.view.SurfaceHolder, int, int, int)
*/
@Override
public void surfaceChanged(SurfaceHolder holder, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
// 将holder，这个holder为开始在oncreat里面取得的holder，将它赋给surfaceHolder
surfaceHolder = holder;
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) w / h;
if (sizes == null) return null;

Size optimalSize = null;
double minDiff = Double.MAX_VALUE;

int targetHeight = h;

// Try to find an size match aspect ratio and size
for (Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}

// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceCreated(android.view.SurfaceHolder)
*/
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
surfaceHolder = holder;

try {
if(isCameraBack){
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);//打开摄像头

}else{
camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);//打开摄像头

}

//设置camera预览的角度，因为默认图片是倾斜90度的
camera.setDisplayOrientation(90);

Size pictureSize=null;
Size previewSize=null;
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewFrameRate(5);
//设置旋转代码
parameters.setRotation(90);
//			parameters.setPictureFormat(PixelFormat.JPEG);

List<Size> supportedPictureSizes
= SupportedSizesReflect.getSupportedPictureSizes(parameters);
List<Size> supportedPreviewSizes
= SupportedSizesReflect.getSupportedPreviewSizes(parameters);

if ( supportedPictureSizes != null &&
supportedPreviewSizes != null &&
supportedPictureSizes.size() > 0 &&
supportedPreviewSizes.size() > 0) {

//2.x
pictureSize = supportedPictureSizes.get(0);

int maxSize = 1280;
if(maxSize > 0){
for(Size size : supportedPictureSizes){
if(maxSize >= Math.max(size.width,size.height)){
pictureSize = size;
break;
}
}
}

WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
DisplayMetrics displayMetrics = new DisplayMetrics();
display.getMetrics(displayMetrics);

previewSize = getOptimalPreviewSize(
supportedPreviewSizes,
display.getWidth(),
display.getHeight());

parameters.setPictureSize(pictureSize.width, pictureSize.height);
parameters.setPreviewSize(previewSize.width, previewSize.height);

}
camera.setParameters(parameters);
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}

}

/* (non-Javadoc)
* @see android.view.SurfaceHolder.Callback#surfaceDestroyed(android.view.SurfaceHolder)
*/
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
if(camera!=null){
camera.release();
}
surfaceview = null;
surfaceHolder = null;
if (surfaceHolder != null) {
surfaceHolder=null;
}
if (mediarecorder != null) {
mediarecorder=null;
}
if (mediaPlayer != null) {
mediaPlayer.release();
mediaPlayer = null;
}

}

/* (non-Javadoc)
* @see android.media.MediaPlayer.OnCompletionListener#onCompletion(android.media.MediaPlayer)
*/
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
LogsUtil.i(TAG, "onCompletion");
if (mediaPlayer != null) {
mediaPlayer.release();
mediaPlayer = null;
}
recordPlayIv.setVisibility(View.VISIBLE);
}

/* (non-Javadoc)
* @see android.media.MediaPlayer.OnPreparedListener#onPrepared(android.media.MediaPlayer)
*/
@Override
public void onPrepared(MediaPlayer arg0) {
// TODO Auto-generated method stub
mVideoWidth = mediaPlayer.getVideoWidth();
mVideoHeight = mediaPlayer.getVideoHeight();
if (mVideoWidth != 0 && mVideoHeight != 0)
{

/* 设置视频的宽度和高度 */
surfaceHolder.setFixedSize(mVideoWidth,mVideoHeight);

/* 开始播放 */
mediaPlayer.start();
}
}

/* (non-Javadoc)
* @see android.media.MediaPlayer.OnBufferingUpdateListener#onBufferingUpdate(android.media.MediaPlayer, int)
*/
@Override
public void onBufferingUpdate(MediaPlayer player, int arg1) {
// TODO Auto-generated method stub

}

}

程序布局

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout android:orientation="vertical"

android:layout_width="fill_parent" android:background="@drawable/login_bj"

android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

<include android:id="@+id/Title"

android:layout_alignParentTop="true"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

layout="@layout/layout_common_title"/>

<LinearLayout

android:layout_below="@+id/Title"

android:layout_above="@+id/recordBtn"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:padding="30dp"

>

<SurfaceView

android:id="@+id/surfaceview"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

</LinearLayout>

<RelativeLayout

android:id="@+id/videoPlay"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:gravity="center"

>

<ImageView

android:src="@drawable/btn_video_play_bg"

android:id="@+id/recordPlayIv"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:clickable="true"

android:onClick="playVideo"

android:visibility="gone"

/>

</RelativeLayout>

<RelativeLayout

android:id="@+id/recordBtn"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:layout_alignParentBottom="true">

<ImageView

android:src="@drawable/video_recorder_start_btn_nor"

android:id="@+id/recordIv"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:clickable="true"

android:onClick="recordVideo"

/>

</RelativeLayout>

</RelativeLayout>