public class SurfaceViewActivity extends AppCompatActivity {String TAG="SurfaceViewActivity_AA";TextureView textureView=null;CaptureRequest.Builder mCaptureRequestBuilder;CaptureRequest  mCaptureRequest;Surface mSurfacePrevew; //预览的surfaceImageReader  mImageReader;private Size mPreviewSize;private Size mCaptureSize;CameraDevice  mCameraDevice;private CameraCaptureSession mCameraCaptureSession;;private static final SparseIntArray ORIENTATION = new SparseIntArray();static {ORIENTATION.append(Surface.ROTATION_0, 90);ORIENTATION.append(Surface.ROTATION_90, 0);ORIENTATION.append(Surface.ROTATION_180, 270);ORIENTATION.append(Surface.ROTATION_270, 180);}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_surface_view);textureView=(TextureView)findViewById(R.id.svPhoto);textureView.setSurfaceTextureListener(new SurfaceTextureListener());findViewById(R.id.btPhoto).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {capture();}});}@TargetApi(Build.VERSION_CODES.LOLLIPOP)private void OpenCamera(){try {Log.e(TAG,"OpenCamera");CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);try {//遍历所有摄像头for (String cameraId: manager.getCameraIdList()) {CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);//默认打开后置摄像头if (characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT)continue;//获取StreamConfigurationMap，它是管理摄像头支持的所有输出格式和尺寸StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);mPreviewSize = getOptimalSize(map.getOutputSizes(SurfaceTexture.class), mPreviewSize.getWidth(), mPreviewSize.getHeight());//获取相机支持的最大拍照尺寸mCaptureSize = Collections.max(Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)), new Comparator<Size>() {@Overridepublic int compare(Size lhs, Size rhs) {return Long.signum(lhs.getWidth() * lhs.getHeight() - rhs.getHeight() * rhs.getWidth());}});break;}} catch (CameraAccessException e) {e.printStackTrace();}manager.openCamera(manager.getCameraIdList()[0], new CameraState(), null);}catch (Exception ex){}}class CameraState extends CameraDevice.StateCallback {@Overridepublic void onOpened(CameraDevice camera) {mCameraDevice = camera;try {setupImageReader();SurfaceTexture mSurfaceTexture = textureView.getSurfaceTexture();//设置TextureView的缓冲区大小mSurfaceTexture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());//获取Surface显示预览数据mSurfacePrevew = new Surface(mSurfaceTexture);//需要同时增加预览和拍照的 Surfacecamera.createCaptureSession(Arrays.asList(mSurfacePrevew,mImageReader.getSurface()), new CameraSessionState(), null);}catch (Exception ex){}}@Overridepublic void onDisconnected(CameraDevice camera) {Log.e(TAG,"CameraState ==> onDisconnected camera.id="+camera.getId());}@Overridepublic void onError(CameraDevice camera, int error) {Log.e(TAG,"CameraState ==> handleMessage camera.id="+camera.getId()+"  error="+error);}@Overridepublic void onClosed(CameraDevice camera) {super.onClosed(camera);Log.e(TAG,"CameraState ==> onClosed camera.id="+camera.getId());//当调用CameraDevice.close()关闭相机设备后会回调此方法。camera为别关闭的相机设备。//该方法被回调执行后，任何尝试调用camera相关的操作都会失败，并且抛出一个IllegalStateException异常}}class CameraSessionState extends   CameraCaptureSession.StateCallback{@Overridepublic void onConfigured(CameraCaptureSession session) {Log.e(TAG, "CameraSessionState onConfigured");try {//创建CaptureRequestBuilder，TEMPLATE_PREVIEW比表示预览请求mCaptureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);//设置Surface作为预览数据的显示界面mCaptureRequestBuilder.addTarget(mSurfacePrevew);//创建捕获请求mCaptureRequest = mCaptureRequestBuilder.build();mCameraCaptureSession = session;//设置反复捕获数据的请求，这样预览界面就会一直有数据显示mCameraCaptureSession.setRepeatingRequest(mCaptureRequest, null, null);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onConfigureFailed(CameraCaptureSession session) {Log.e(TAG,"CameraSessionState onConfigureFailed");}}class SurfaceTextureListener implements TextureView.SurfaceTextureListener{@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {Log.e(TAG,"SurfaceTextureListener===> onSurfaceTextureAvailable");mPreviewSize=new Size(width,height);OpenCamera();}@Overridepublic void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {Log.e(TAG,"SurfaceTextureListener===> onSurfaceTextureSizeChanged");}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {Log.e(TAG,"SurfaceTextureListener===> onSurfaceTextureDestroyed");return false;}@Overridepublic void onSurfaceTextureUpdated(SurfaceTexture surface) {// Log.e(TAG,"SurfaceTextureListener===> onSurfaceTextureUpdated");}}private void capture() {Log.e(TAG,"capture===>  ");try {//首先我们创建请求拍照的CaptureRequestif(mCameraDevice==null)return;final CaptureRequest.Builder mCaptureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);//获取屏幕方向int rotation = getWindowManager().getDefaultDisplay().getRotation();//设置CaptureRequest输出到mImageReadermCaptureBuilder.addTarget(mImageReader.getSurface());//设置拍照方向mCaptureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATION.get(rotation));//这个回调接口用于拍照结束时重启预览，因为拍照会导致预览停止CameraCaptureSession.CaptureCallback mImageSavedCallback = new CameraCaptureSession.CaptureCallback() {@Overridepublic void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {// Toast.makeText(getApplicationContext(), "Image Saved!", Toast.LENGTH_SHORT).show();//重启预览Log.e(TAG,"capture===>  restartPreview");restartPreview();}};//停止预览mCameraCaptureSession.stopRepeating();//开始拍照，然后回调上面的接口重启预览，因为mCaptureBuilder设置ImageReader作为target，所以会自动回调ImageReader的onImageAvailable()方法保存图片mCameraCaptureSession.capture(mCaptureBuilder.build(), mImageSavedCallback, null);Log.e(TAG,"capture===>  end");} catch (CameraAccessException e) {e.printStackTrace();}}private void restartPreview() {try {//执行setRepeatingRequest方法就行了，注意mCaptureRequest是之前开启预览设置的请求mCameraCaptureSession.setRepeatingRequest(mCaptureRequest, null, null);} catch (CameraAccessException e) {e.printStackTrace();}}private void setupImageReader() {//前三个参数分别是需要的尺寸和格式，最后一个参数代表每次最多获取几帧数据，本例的2代表ImageReader中最多可以获取两帧图像流mImageReader = ImageReader.newInstance(mCaptureSize.getWidth(), mCaptureSize.getHeight(), ImageFormat.JPEG, 2);//YUV_420_888//监听ImageReader的事件，当有图像流数据可用时会回调onImageAvailable方法，它的参数就是预览帧数据，可以对这帧数据进行处理mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {@Overridepublic void onImageAvailable(ImageReader reader) {Log.e(TAG,"========onImageAvailable==========");Image image = reader.acquireLatestImage();new Thread(new imageSaver(image,System.currentTimeMillis()+"")).start();}}, null);}public class imageSaver implements Runnable {private Image mImage;private String imgName;public imageSaver(Image image,String imgName) {mImage = image;this.imgName=imgName;}@Overridepublic void run() {//我们可以将这帧数据转成字节数组，类似于Camera1的PreviewCallback回调的预览帧数据ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();byte[] data = new byte[buffer.remaining()];buffer.get(data);File mImageFile = new File(Environment.getExternalStorageDirectory() + "/"+imgName+".jpg");FileOutputStream fos = null;try {fos = new FileOutputStream(mImageFile);fos.write(data, 0 ,data.length);} catch (IOException e) {e.printStackTrace();} finally {mImageFile = null;if (fos != null) {try {fos.close();fos = null;} catch (IOException e) {e.printStackTrace();}}mImage.close();}}}//选择sizeMap中大于并且最接近width和height的sizeprivate Size getOptimalSize(Size[] sizeMap,int Width,int height){ArrayList<Size> list=new ArrayList<>();Log.e(TAG,"Width="+Width+",height="+height);for(Size size:sizeMap){Log.e(TAG,"size.w="+size.getWidth()+"   size.h="+size.getHeight());if(size.getWidth()>Width && size.getHeight()>height) {list.add(new Size(size.getWidth(),size.getHeight()));Log.e(TAG,"===============list  size.w="+size.getWidth()+"   size.h="+size.getHeight());}}if(list.size()>0){Size size= Collections.min(list, new Comparator<Size>() {@Overridepublic int compare(Size o1, Size o2) {return o1.getWidth()*o1.getHeight() - o2.getWidth()*o2.getHeight();}});Log.e(TAG,"最终 size.w="+size.getWidth()+"  ,size.h="+size.getHeight());return size;}else{return sizeMap[0];}}
}