AndroID camera实时预览 实时处理，面部认证。
预览 *** 作是网友共享的代码，我在继承SurfaceVIEw 的CameraSurfaceVIEw 中加入了帧监听事件，每次预览监听前五个数据帧，在处理做一个面部识别。
先看目录关系
CameraSurfaceVIEw.Java
package com.centaur.camera.prevIEw;import androID.content.Context;import androID.graphics.Bitmap;import androID.graphics.BitmapFactory;import androID.graphics.ImageFormat;import androID.graphics.Matrix;import androID.graphics.PixelFormat;import androID.graphics.Rect;import androID.graphics.YuvImage;import androID.harDWare.Camera;import androID.util.AttributeSet;import androID.util.Log;import androID.vIEw.SurfaceHolder;import androID.vIEw.SurfaceVIEw;import com.centaur.camera.camera.CameraInterface;import java.io.ByteArrayOutputStream;/** * Created by Tianchaoxiong on 2017/1/16. */public class CameraSurfaceVIEw extends SurfaceVIEw implements SurfaceHolder.Callback,Camera.PrevIEwCallback{ private static final int FACENUM = 5; private static final String TAG = "yanzi"; CameraInterface mCameraInterface; Context mContext; SurfaceHolder mSurfaceHolder; private boolean isFinish; //传输五个bitmap数组 Bitmap [] bitmaps = new Bitmap[5]; int number = 0;//作为计数器用 OnFaceCollectListener onFaceCollectListener = null; public CameraSurfaceVIEw(Context context,AttributeSet attrs) { super(context,attrs); mContext = context; mSurfaceHolder = getHolder(); mSurfaceHolder.setFormat(PixelFormat.transparent);//translucent半透明 transparent透明 mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); mSurfaceHolder.addCallback(this); } @OverrIDe public voID surfaceCreated(SurfaceHolder surfaceHolder) { Log.i(TAG,"surfaceCreated..."); } @OverrIDe public voID surfaceChanged(SurfaceHolder surfaceHolder,int i,int i1,int i2) { Log.i(TAG,"surfaceChanged..."); } @OverrIDe public voID surfaceDestroyed(SurfaceHolder surfaceHolder) { Log.i(TAG,"surfaceDestroyed..."); CameraInterface.getInstance().doStopCamera(); } public SurfaceHolder getSurfaceHolder(){ return mSurfaceHolder; } /** * 收集五张图片 监听器 */ public static interface OnFaceCollectListener { /** * 收集五张face * @param bitmaps 返回的五张脸的数组 */ voID OnFaceCollected(Bitmap[] bitmaps); /** * face重新绘制 * @param isstart 是否重新收集 */ voID OnFaceCollectStart(boolean isstart); } /** * 设置面部的监听器 * @param onFaceCollectListener */ public voID setonFaceCollectListener(OnFaceCollectListener onFaceCollectListener){ if(onFaceCollectListener!=null){ this.onFaceCollectListener = onFaceCollectListener; } } /*** * 想在这里做一个监听处理 收五侦 传输出去 * @param bytes * @param camera */ @OverrIDe public voID onPrevIEwFrame(byte[] bytes,Camera camera) { if(number<FACENUM){ //收集 //判断监听器 开始 if(onFaceCollectListener!=null){ onFaceCollectListener.OnFaceCollectStart(true); //有byte数组转为bitmap bitmaps[number] = byte2bitmap(bytes,camera); Log.d("ceshiTian","********收集了"+number+"个************"); number = number+1; if(number==5){ Log.d("ceshiTian","********收集够5个************"); //提交 onFaceCollectListener.OnFaceCollected(bitmaps); } } }else { //不做 *** 作 onFaceCollectListener.OnFaceCollectStart(false); onFaceCollectListener.OnFaceCollected(null); } } private Bitmap byte2bitmap(byte[] bytes,Camera camera) { Bitmap bitmap = null; Camera.Size size = camera.getParameters().getPrevIEwSize(); // 获取预览大小 final int w = size.wIDth; // 宽度 final int h = size.height; final YuvImage image = new YuvImage(bytes,ImageFormat.NV21,w,h,null); ByteArrayOutputStream os = new ByteArrayOutputStream(bytes.length); if (!image.compresstoJpeg(new Rect(0,h),100,os)) { return null; } byte[] tmp = os.toByteArray(); bitmap = BitmapFactory.decodeByteArray(tmp,tmp.length); Matrix matrix = new Matrix(); matrix.setRotate(-90); bitmap = Bitmap.createBitmap(bitmap,bitmap.getWIDth(),bitmap.getHeight(),matrix,true); return bitmap; }}CameraInterface.java
package com.centaur.camera.camera;import androID.graphics.Bitmap;import androID.graphics.BitmapFactory;import androID.graphics.ImageFormat;import androID.graphics.Matrix;import androID.graphics.PixelFormat;import androID.graphics.Rect;import androID.graphics.YuvImage;import androID.harDWare.Camera;import androID.util.Log;import androID.vIEw.SurfaceHolder;import com.centaur.camera.util.CamParaUtil;import com.centaur.camera.util.ImageUtil;import com.centaur.util.fileUtils;import java.io.IOException;import java.util.List;/** * Created by Tianchaoxiong on 2017/1/16. */public class CameraInterface { private static final String TAG = "Tianchaoxiong"; private Camera mCamera; private Camera.Parameters mParams; private boolean isPrevIEwing = false; private float mPreviwRate = -1f; private static CameraInterface mCameraInterface; public interface CamOpenOverCallback { public voID cameraHasOpened(); } private CameraInterface() { } public static synchronized CameraInterface getInstance() { if (mCameraInterface == null) { mCameraInterface = new CameraInterface(); } return mCameraInterface; } /** * 打开Camera * * @param callback */ public voID doOpenCamera(CamOpenOverCallback callback) { Log.i(TAG,"Camera open...."); mCamera = Camera.open(1); Log.i(TAG,"Camera open over...."); callback.cameraHasOpened(); } /** * 开启预览 * * @param holder * @param prevIEwRate */ public voID doStartPrevIEw(SurfaceHolder holder,float prevIEwRate,Camera.PrevIEwCallback prevIEwCallback) { Log.i(TAG,"doStartPrevIEw..."); if (isPrevIEwing) { mCamera.stopPrevIEw(); return; } if (mCamera != null) { mParams = mCamera.getParameters(); mParams.setPictureFormat(PixelFormat.JPEG);//设置拍照后存储的图片格式 //对支持的图片的大小的一个收集 CamParaUtil.getInstance().printSupportPictureSize(mParams); CamParaUtil.getInstance().printSupportPrevIEwSize(mParams); //设置PrevIEwSize和PictureSize Camera.Size pictureSize = CamParaUtil.getInstance().getPropPictureSize( mParams.getSupportedPictureSizes(),prevIEwRate,800); mParams.setPictureSize(pictureSize.wIDth,pictureSize.height); Camera.Size prevIEwSize = CamParaUtil.getInstance().getPropPrevIEwSize( mParams.getSupportedPrevIEwSizes(),800); mParams.setPrevIEwSize(prevIEwSize.wIDth,prevIEwSize.height); mCamera.setdisplayOrIEntation(90); CamParaUtil.getInstance().printSupportFocusMode(mParams); List<String> focusModes = mParams.getSupportedFocusModes(); if (focusModes.contains("continuous-vIDeo")) { mParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO); } mCamera.setParameters(mParams); //参数设置完毕 try { mCamera.setPrevIEwdisplay(holder); mCamera.setPrevIEwCallback(prevIEwCallback); mCamera.startPrevIEw();//开启预览 } catch (IOException e) { // Todo auto-generated catch block e.printstacktrace(); } isPrevIEwing = true; mPreviwRate = prevIEwRate; mParams = mCamera.getParameters(); //重新get一次 Log.i(TAG,"最终设置:PrevIEwSize--With = " + mParams.getPrevIEwSize().wIDth + "Height = " + mParams.getPrevIEwSize().height); Log.i(TAG,"最终设置:PictureSize--With = " + mParams.getPictureSize().wIDth + "Height = " + mParams.getPictureSize().height); } } /** * 停止预览，释放Camera */ public voID doStopCamera() { if (null != mCamera) { mCamera.setPrevIEwCallback(null); mCamera.stopPrevIEw(); isPrevIEwing = false; mPreviwRate = -1f; mCamera.release(); mCamera = null; } } /** * 拍照 */ public voID doTakePicture() { if (isPrevIEwing && (mCamera != null)) { Log.d("fileUtils","程序运行到这里了111"); mCamera.takePicture(mShutterCallback,null,mJpegPictureCallback); } } /*为了实现拍照的快门声音及拍照保存照片需要下面三个回调变量*/ Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() //快门按下的回调，在这里我们可以设置类似播放“咔嚓”声之类的 *** 作。默认的就是咔嚓。 { public voID onShutter() { // Todo auto-generated method stub Log.i(TAG,"myShutterCallback:onShutter..."); } }; /* Camera.PictureCallback mRawCallback = new Camera.PictureCallback() // 拍摄的未压缩原数据的回调,可以为null { public voID onPictureTaken(byte[] data,Camera camera) { // Todo auto-generated method stub Log.i(TAG,"myRawCallback:onPictureTaken..."); } };*/ Camera.PictureCallback mJpegPictureCallback = new Camera.PictureCallback() //对jpeg图像数据的回调,最重要的一个回调 { public voID onPictureTaken(byte[] data,Camera camera) { Log.d("fileUtils","程序运行到这里了222"); // Todo auto-generated method stub Log.i(TAG,"myJpegCallback:onPictureTaken..."); Bitmap b = null; if (null != data) { b = BitmapFactory.decodeByteArray(data,data.length);//data是字节数据，将其解析成位图 mCamera.stopPrevIEw(); isPrevIEwing = false; Log.d("fileUtils","程序运行到这里了333"); } //保存图片到sdcard if (null != b) { Log.d("fileUtils","程序运行到这里了444"); //设置FOCUS_MODE_CONTINUOUS_VIDEO)之后，myParam.set("rotation",90)失效。 //图片竟然不能旋转了，故这里要旋转下 Log.d("fileUtils","程序运行到这里了"); Bitmap rotaBitmap = ImageUtil.getRotateBitmap(b,-90.0f); fileUtils.savePaiZhaoBitmap(rotaBitmap); } } };}CameraActivity
package com.centaur.camera.Activity;import androID.content.Intent;import androID.graphics.Bitmap;import androID.graphics.Point;import androID.os.Bundle;import androID.os.Environment;import androID.os.Handler;import androID.support.v7.app.AppCompatActivity;import androID.util.Log;import androID.vIEw.SurfaceHolder;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.Imagebutton;import androID.Widget.TextVIEw;import com.centaur.camera.camera.CameraInterface;import com.centaur.camera.prevIEw.CameraSurfaceVIEw;import com.centaur.camera.util.displayUtil;import com.centaur.testutil.R;import com.centaur.testutil.ShowPic;import com.centaur.util.DetecteSDK;import com.centaur.util.DetecteSeeta;public class CameraActivity extends AppCompatActivity implements CameraSurfaceVIEw.OnFaceCollectListener,CameraInterface.CamOpenOverCallback{ private static final String TAG = "CameraActivity"; private float recLen = 0; long te; float prevIEwRate = -1f; DetecteSDK detecteSDK; DetecteSeeta detecteSeeta; Bitmap bmp; Bitmap bitmapfianl; private Imagebutton shutterBtn; private TextVIEw textVIEw; private CameraSurfaceVIEw surfaceVIEw = null; @OverrIDe protected voID onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); Thread openThread = new Thread(){ @OverrIDe public voID run() { CameraInterface.getInstance().doOpenCamera(CameraActivity.this); } }; openThread.start(); te = System.currentTimeMillis(); setContentVIEw(R.layout.activity_camera); initVIEw(); initVIEwParams(); surfaceVIEw.setonFaceCollectListener(this); shutterBtn.setonClickListener(new BtnListeners()); TimeHandler.postDelayed(TimeRunnable,500); } /** * 回调方法 * activity中的视图和 interface中的代码实现绑定 */ @OverrIDe public voID cameraHasOpened() { SurfaceHolder holder = surfaceVIEw.getSurfaceHolder(); CameraInterface.getInstance().doStartPrevIEw(holder,surfaceVIEw ); } @OverrIDe protected voID onDestroy() { // Todo auto-generated method stub super.onDestroy(); CameraInterface.getInstance().doStopCamera(); Log.d("RunTime","onDestroy:time:"+te); TimeHandler.removeCallbacks(TimeRunnable); } @OverrIDe protected voID onPause() { // Todo auto-generated method stub super.onPause(); CameraInterface.getInstance().doStopCamera(); te = System.currentTimeMillis()-te; Log.d("RunTime","onPause:time:"+te); TimeHandler.removeCallbacks(TimeRunnable); } Handler TimeHandler = new Handler(); Runnable TimeRunnable = new Runnable() { @OverrIDe public voID run() { recLen+=500; textVIEw.setText("检测时间：" + recLen/1000+"秒"); TimeHandler.postDelayed(this,500); } }; private voID initVIEw(){ surfaceVIEw = (CameraSurfaceVIEw)findVIEwByID(R.ID.camera_surfacevIEw); shutterBtn = (Imagebutton)findVIEwByID(R.ID.btn_shutter); textVIEw = (TextVIEw) findVIEwByID(R.ID.time); } private voID initVIEwParams(){ VIEwGroup.LayoutParams params = surfaceVIEw.getLayoutParams(); Point p = displayUtil.getScreenMetrics(this); params.wIDth = p.x; params.height = p.y; prevIEwRate = displayUtil.getScreenRate(this); //默认全屏的比例预览 surfaceVIEw.setLayoutParams(params); //手动设置拍照Imagebutton的大小为120dip×120dip,原图片大小是64×64 VIEwGroup.LayoutParams p2 = shutterBtn.getLayoutParams(); p2.wIDth = displayUtil.dip2px(this,80); p2.height = displayUtil.dip2px(this,80); shutterBtn.setLayoutParams(p2); } /** * 自建 * @param bitmaps 返回的五张脸的数组 */ @OverrIDe public voID OnFaceCollected(Bitmap[] bitmaps) { } /** * 自建 * @param isstart 是否重新收集 */ @OverrIDe public voID OnFaceCollectStart(boolean isstart) { if(isstart){ Log.d("CameraActivity","开始收集"); } } private class BtnListeners implements VIEw.OnClickListener { @OverrIDe public voID onClick(VIEw v) { // Todo auto-generated method stub switch(v.getID()){ case R.ID.btn_shutter: CameraInterface.getInstance().doTakePicture(); Intent intent =new Intent(CameraActivity.this,ShowPic.class); // 默认一个暂存的路径 /FaceDetection/useso/Pictures/Tmp/tmp.png String FolderPath = "/FaceDetection/useso/Pictures/Tmp/tmp.png"; String path = Environment.getExternalStorageDirectory()+FolderPath; intent.putExtra("picpath",path); startActivity(intent); finish(); break; default:break; } } }}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。
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