android Camera2
【摘要】
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：
privat...
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：
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private void setupImageReader() {
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//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
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mImageReader = ImageReader.newInstance(mPreviewSize.getWidth(), mPreviewSize.getHeight(),
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ImageFormat.JPEG, 2);
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//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
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mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
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@Override
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public void onImageAvailable(ImageReader reader) {
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Image image = reader.acquireLatestImage();
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//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
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ByteBuffer buffer = image.getPlanes()[0].getBuffer();
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byte[] data = new byte[buffer.remaining()];
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buffer.get(data);
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image.close();
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}
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}, null);
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}
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package com.mtcnn_as;
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import java.nio.ByteBuffer;
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import java.util.Arrays;
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import android.Manifest;
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import android.app.Activity;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.ImageFormat;
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import android.graphics.Matrix;
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import android.graphics.SurfaceTexture;
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import android.hardware.camera2.CameraAccessException;
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import android.hardware.camera2.CameraCaptureSession;
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import android.hardware.camera2.CameraCharacteristics;
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import android.hardware.camera2.CameraDevice;
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import android.hardware.camera2.CameraManager;
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import android.hardware.camera2.CaptureRequest;
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import android.hardware.camera2.params.StreamConfigurationMap;
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import android.media.Image;
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import android.media.ImageReader;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.HandlerThread;
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import android.support.v4.app.ActivityCompat;
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import android.support.v4.content.ContextCompat;
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import android.util.Log;
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import android.util.Size;
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import android.view.Surface;
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import android.view.TextureView;
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import static com.mtcnn_as.ImageUtils.saveBitmap;
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public class Camera2Demo extends Activity implements
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TextureView.SurfaceTextureListener {
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private CameraDevice mCamera;
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private String mCameraID = "1";
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private TextureView mPreviewView;
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private Size mPreviewSize;
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private CaptureRequest.Builder mPreviewBuilder;
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private ImageReader mImageReader;
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private Handler mHandler;
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private HandlerThread mThreadHandler;
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// 这里定义的是ImageReader回调的图片的大小
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private int mImageWidth = 1920;
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private int mImageHeight = 1080;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_texture);
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initView();
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initLooper();
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}
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// 很多过程都变成了异步的了，所以这里需要一个子线程的looper
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private void initLooper() {
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mThreadHandler = new HandlerThread("CAMERA2");
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mThreadHandler.start();
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mHandler = new Handler(mThreadHandler.getLooper());
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}
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// 可以通过TextureView或者SurfaceView
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private void initView() {
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mPreviewView = (TextureView) findViewById(R.id.textureView);
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mPreviewView.setSurfaceTextureListener(this);
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}
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@Override
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public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
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int height) {
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try {
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// 获得所有摄像头的管理者CameraManager
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CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
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// 获得某个摄像头的特征，支持的参数
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CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(mCameraID);
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// 支持的STREAM CONFIGURATION
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StreamConfigurationMap map = characteristics
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.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
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// 摄像头支持的预览Size数组
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mPreviewSize = map.getOutputSizes(SurfaceTexture.class)[0];
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if (ContextCompat.checkSelfPermission(Camera2Demo.this,
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Manifest.permission.CAMERA)
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!= PackageManager.PERMISSION_GRANTED ||
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ContextCompat.checkSelfPermission(Camera2Demo.this,
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Manifest.permission.WRITE_EXTERNAL_STORAGE)
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!= PackageManager.PERMISSION_GRANTED) {
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ActivityCompat.requestPermissions(Camera2Demo.this,
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new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
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}
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// 打开相机
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if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
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// TODO: Consider calling
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// ActivityCompat#requestPermissions
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// here to request the missing permissions, and then overriding
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// public void onRequestPermissionsResult(int requestCode, String[] permissions,
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// int[] grantResults)
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// to handle the case where the user grants the permission. See the documentation
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// for ActivityCompat#requestPermissions for more details.
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return;
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}
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cameraManager.openCamera(mCameraID, mCameraDeviceStateCallback, mHandler);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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}
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}
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@Override
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public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,
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int height) {
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}
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@Override
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public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
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return false;
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}
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// 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
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@Override
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public void onSurfaceTextureUpdated(SurfaceTexture surface) {
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}
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private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() {
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@Override
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public void onOpened(CameraDevice camera) {
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try {
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mCamera = camera;
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startPreview(mCamera);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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}
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}
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@Override
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public void onDisconnected(CameraDevice camera) {
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}
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@Override
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public void onError(CameraDevice camera, int error) {
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}
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};
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// 开始预览，主要是camera.createCaptureSession这段代码很重要，创建会话
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private void startPreview(CameraDevice camera) throws CameraAccessException {
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SurfaceTexture texture = mPreviewView.getSurfaceTexture();
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// 这里设置的就是预览大小
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texture.setDefaultBufferSize(mPreviewSize.getWidth(),mPreviewSize.getHeight());
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Surface surface = new Surface(texture);
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try {
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// 设置捕获请求为预览，这里还有拍照啊，录像等
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mPreviewBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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}
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// 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：
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// mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE,CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
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mImageReader = ImageReader.newInstance(mImageWidth, mImageHeight,
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ImageFormat.JPEG/* 此处还有很多格式，比如我所用到YUV等 */, 2/*
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* 最大的图片数，
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* mImageReader里能获取到图片数
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* ，
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* 但是实际中是2+1张图片，就是多一张
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*/);
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mImageReader.setOnImageAvailableListener(mOnImageAvailableListener,mHandler);
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// 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！！
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mPreviewBuilder.addTarget(surface);
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mPreviewBuilder.addTarget(mImageReader.getSurface());
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camera.createCaptureSession(
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Arrays.asList(surface, mImageReader.getSurface()),
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mSessionStateCallback, mHandler);
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}
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private CameraCaptureSession.StateCallback mSessionStateCallback = new CameraCaptureSession.StateCallback() {
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@Override
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public void onConfigured(CameraCaptureSession session) {
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try {
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updatePreview(session);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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}
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}
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@Override
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public void onConfigureFailed(CameraCaptureSession session) {
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}
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};
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private void updatePreview(CameraCaptureSession session)
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throws CameraAccessException {
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session.setRepeatingRequest(mPreviewBuilder.build(), null, mHandler);
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}
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private ImageReader.OnImageAvailableListener mOnImageAvailableListener = new ImageReader.OnImageAvailableListener() {
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/**
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* 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
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* reader.acquireNextImage()和close()方法，否则画面就会卡住！！！！！我被这个坑坑了好久！！！
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* 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。
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**/
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@Override
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public void onImageAvailable(ImageReader reader) {
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long startTime = System.currentTimeMillis(); //起始时间
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Image img = reader.acquireNextImage();
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/**
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* 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！！！
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* 我找了好久的办法！！！
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**/
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ByteBuffer buffer = img.getPlanes()[0].getBuffer();
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// 这里就是图片的byte数组了
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byte[] bytes = new byte[buffer.remaining()];
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buffer.get(bytes);
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img.close();
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Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
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Matrix matrix = new Matrix();
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matrix.postRotate(270);
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// matrix.postScale( 1/2, 1/2); // 长和宽放大缩小的比例
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Bitmap bimap1 = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
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int faceInfo[] = null;
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Bitmap rgba = bimap1.copy(Bitmap.Config.ARGB_8888, true);
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long endTime = System.currentTimeMillis(); //结束时间
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int width = rgba.getWidth();
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int height = rgba.getHeight();
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byte[] imageDate = getPixelsRGBA(rgba);
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long endTime2 = System.currentTimeMillis(); //结束时间
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saveBitmap(getApplicationContext(),rgba);
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Log.e("test", String.format("方法使用时间 %d %d ms", endTime - startTime,endTime2-startTime));
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}
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};
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//提取像素点
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private byte[] getPixelsRGBA(Bitmap image) {
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// calculate how many bytes our image consists of
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int bytes = image.getByteCount();
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ByteBuffer buffer = ByteBuffer.allocate(bytes); // Create a new buffer
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image.copyPixelsToBuffer(buffer); // Move the byte data to the buffer
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byte[] temp = buffer.array(); // Get the underlying array containing the
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return temp;
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}
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protected void onPause() {
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if (null != mCamera) {
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mCamera.close();
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mCamera = null;
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}
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if (null != mImageReader) {
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mImageReader.close();
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mImageReader = null;
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}
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super.onPause();
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}
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}
文章来源: blog.csdn.net，作者：网奇，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/jacke121/article/details/101514590
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