android Camera2

控件：

import android.view.TextureView;

这个是代码：

https://github.com/plumcot/Camera2Demo/blob/master/src/com/example/camera2demo/Camera2Demo.java

获取图片数据不对，应该是：

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(mPreviewSize.getWidth(), mPreviewSize.getHeight(),ImageFormat.JPEG, 2);//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) {Image image = reader.acquireLatestImage();//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 = image.getPlanes()[0].getBuffer();byte[] data = new byte[buffer.remaining()];buffer.get(data);image.close();}}, null);
}

package com.mtcnn_as;import java.nio.ByteBuffer;
import java.util.Arrays;import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.Image;
import android.media.ImageReader;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import android.view.TextureView;
import static com.mtcnn_as.ImageUtils.saveBitmap;
public class Camera2Demo extends Activity implementsTextureView.SurfaceTextureListener {private CameraDevice mCamera;private String mCameraID = "1";private TextureView mPreviewView;private Size mPreviewSize;private CaptureRequest.Builder mPreviewBuilder;private ImageReader mImageReader;private Handler mHandler;private HandlerThread mThreadHandler;// 这里定义的是ImageReader回调的图片的大小private int mImageWidth = 1920;private int mImageHeight = 1080;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_texture);initView();initLooper();}// 很多过程都变成了异步的了，所以这里需要一个子线程的looperprivate void initLooper() {mThreadHandler = new HandlerThread("CAMERA2");mThreadHandler.start();mHandler = new Handler(mThreadHandler.getLooper());}// 可以通过TextureView或者SurfaceViewprivate void initView() {mPreviewView = (TextureView) findViewById(R.id.textureView);mPreviewView.setSurfaceTextureListener(this);}@Overridepublic void onSurfaceTextureAvailable(SurfaceTexture surface, int width,int height) {try {// 获得所有摄像头的管理者CameraManagerCameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);// 获得某个摄像头的特征，支持的参数CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(mCameraID);// 支持的STREAM CONFIGURATIONStreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);// 摄像头支持的预览Size数组mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];if (ContextCompat.checkSelfPermission(Camera2Demo.this,Manifest.permission.CAMERA)!= PackageManager.PERMISSION_GRANTED ||ContextCompat.checkSelfPermission(Camera2Demo.this,Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED) {ActivityCompat.requestPermissions(Camera2Demo.this,new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE},1);}// 打开相机if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {// TODO: Consider calling//    ActivityCompat#requestPermissions// here to request the missing permissions, and then overriding//   public void onRequestPermissionsResult(int requestCode, String[] permissions,//                                          int[] grantResults)// to handle the case where the user grants the permission. See the documentation// for ActivityCompat#requestPermissions for more details.return;}cameraManager.openCamera(mCameraID, mCameraDeviceStateCallback, mHandler);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,int height) {}@Overridepublic boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {return false;}// 这个方法要注意一下，因为每有一帧画面，都会回调一次此方法@Overridepublic void onSurfaceTextureUpdated(SurfaceTexture surface) {}private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() {@Overridepublic void onOpened(CameraDevice camera) {try {mCamera = camera;startPreview(mCamera);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onDisconnected(CameraDevice camera) {}@Overridepublic void onError(CameraDevice camera, int error) {}};// 开始预览，主要是camera.createCaptureSession这段代码很重要，创建会话private void startPreview(CameraDevice camera) throws CameraAccessException {SurfaceTexture texture = mPreviewView.getSurfaceTexture();// 这里设置的就是预览大小texture.setDefaultBufferSize(mPreviewSize.getWidth(),mPreviewSize.getHeight());Surface surface = new Surface(texture);try {// 设置捕获请求为预览，这里还有拍照啊，录像等mPreviewBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);} catch (CameraAccessException e) {e.printStackTrace();}// 就是在这里，通过这个set(key,value)方法，设置曝光啊，自动聚焦等参数！！ 如下举例：// mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE,CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);mImageReader = ImageReader.newInstance(mImageWidth, mImageHeight,ImageFormat.JPEG/* 此处还有很多格式，比如我所用到YUV等 */, 2/** 最大的图片数，* mImageReader里能获取到图片数* ，* 但是实际中是2+1张图片，就是多一张*/);mImageReader.setOnImageAvailableListener(mOnImageAvailableListener,mHandler);// 这里一定分别add两个surface，一个Textureview的，一个ImageReader的，如果没add，会造成没摄像头预览，或者没有ImageReader的那个回调！！mPreviewBuilder.addTarget(surface);mPreviewBuilder.addTarget(mImageReader.getSurface());camera.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),mSessionStateCallback, mHandler);}private CameraCaptureSession.StateCallback mSessionStateCallback = new CameraCaptureSession.StateCallback() {@Overridepublic void onConfigured(CameraCaptureSession session) {try {updatePreview(session);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onConfigureFailed(CameraCaptureSession session) {}};private void updatePreview(CameraCaptureSession session)throws CameraAccessException {session.setRepeatingRequest(mPreviewBuilder.build(), null, mHandler);}private ImageReader.OnImageAvailableListener mOnImageAvailableListener = new ImageReader.OnImageAvailableListener() {/*** 当有一张图片可用时会回调此方法，但有一点一定要注意： 一定要调用* reader.acquireNextImage()和close()方法，否则画面就会卡住！！！！！我被这个坑坑了好久！！！* 很多人可能写Demo就在这里打一个Log，结果卡住了，或者方法不能一直被回调。**/@Overridepublic void onImageAvailable(ImageReader reader) {long startTime = System.currentTimeMillis(); //起始时间Image img = reader.acquireNextImage();/*** 因为Camera2并没有Camera1的Priview回调！！！所以该怎么能到预览图像的byte[]呢？就是在这里了！！！* 我找了好久的办法！！！**/ByteBuffer buffer = img.getPlanes()[0].getBuffer();// 这里就是图片的byte数组了byte[] bytes = new byte[buffer.remaining()];buffer.get(bytes);img.close();Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);Matrix matrix = new Matrix();matrix.postRotate(270);
//                        matrix.postScale( 1/2,  1/2); // 长和宽放大缩小的比例Bitmap bimap1 = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);int faceInfo[] = null;Bitmap rgba = bimap1.copy(Bitmap.Config.ARGB_8888, true);long endTime = System.currentTimeMillis(); //结束时间int width = rgba.getWidth();int height = rgba.getHeight();byte[] imageDate = getPixelsRGBA(rgba);long endTime2 = System.currentTimeMillis(); //结束时间saveBitmap(getApplicationContext(),rgba);Log.e("test", String.format("方法使用时间 %d %d ms", endTime - startTime,endTime2-startTime));}};//提取像素点private byte[] getPixelsRGBA(Bitmap image) {// calculate how many bytes our image consists ofint bytes = image.getByteCount();ByteBuffer buffer = ByteBuffer.allocate(bytes); // Create a new bufferimage.copyPixelsToBuffer(buffer); // Move the byte data to the bufferbyte[] temp = buffer.array(); // Get the underlying array containing thereturn temp;}protected void onPause() {if (null != mCamera) {mCamera.close();mCamera = null;}if (null != mImageReader) {mImageReader.close();mImageReader = null;}super.onPause();}
}

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