Android camera实时预览 实时处理，面部认证。
预览操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
- 自定义控件CameraSurfaceView.java
- 自定义接口方法CameraInterface.java
- CameraActivity预览界面。
CameraSurfaceView.Java
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 | 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;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; } public static interface onFaceCollectListener { void onFaceCollected(Bitmap[] bitmaps); void onFaceCollectStart(boolean isStart); } public void setonFaceCollectListener(onFaceCollectListener onFaceCollectListener){ if(onFaceCollectListener!=null){ this.onFaceCollectListener = onFaceCollectListener; } } @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="" {="" 不做操作="" onfacecollectlistener.onfacecollectstart(false);="" onfacecollectlistener.onfacecollected(null);="" private="" bitmap="" byte2bitmap(byte[]="" bytes,="" camera="" camera)="" camera.size="" size="camera.getParameters().getPreviewSize();" 获取预览大小="" final="" int="" w="size.width;" 宽度="" h="size.height;" yuvimage="" image="new" yuvimage(bytes,="" imageformat.nv21,="" w,="" h,="" null);="" bytearrayoutputstream="" os="new" bytearrayoutputstream(bytes.length);="" if="" (!image.compresstojpeg(new="" rect(0,="" 0,="" h),="" 100,="" os))="" return="" null;="" byte[]="" tmp="os.toByteArray();" tmp.length);="" matrix="" matrix();="" matrix.setrotate(-90);="" bitmap;="" <="" pre=""><p>CameraInterface.java</p><pre class="brush:php;toolbar:false">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;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; } public void doOpenCamera(CamOpenOverCallback callback) { Log.i(TAG, "Camera open...."); mCamera = Camera.open(1); Log.i(TAG, "Camera open over...."); callback.cameraHasOpened(); } 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(), previewRate, 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); } } public void doStopCamera() { if (null != mCamera) { mCamera.setPreviewCallback(null); mCamera.stopPreview(); isPreviewing = false; mPreviwRate = -1f; mCamera.release(); mCamera = null; } } public void doTakePicture() { if (isPreviewing && (mCamera != null)) { Log.d("FileUtils", "程序运行到这里了111"); mCamera.takePicture(mShutterCallback, null, mJpegPictureCallback); } } 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”声之类的操作。默认的就是咔嚓。 { public void onShutter() { // TODO Auto-generated method stub Log.i(TAG, "myShutterCallback:onShutter..."); } }; 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, 0, 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); } } };}</string></pre><p>CameraActivity</p><pre class="brush:php;toolbar:false">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); } @Override public void cameraHasOpened() { SurfaceHolder holder = surfaceView.getSurfaceHolder(); CameraInterface.getInstance().doStartPreview(holder, previewRate,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); } @Override public void onFaceCollected(Bitmap[] bitmaps) { } @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; } } }}</pre><p>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考高分网。<br></p></facenum){> |
