MSCameraTextureViewManager.java
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.RectF;
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.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.MeteringRectangle;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.Image;
import android.media.ImageReader;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import android.view.TextureView;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class MSCameraTextureViewManager {
private Size mPreviewSize;
private AutoFitTextureView mAutoFitTextureView;
private Activity mContext;
public final static String CAMERA_FRONT = "1";
public final static String CAMERA_BACK = "0";
private String mCameraId = "0";
private boolean mIsFaceAi;
private CameraDevice mCameraDevice;
private static final String TAG = "FaceCameraManager";
private static final String TAG_PREVIEW = "预览";
private CaptureRequest mPreviewRequest;
private Surface mPreviewSurface;
private CaptureRequest.Builder mPreviewRequestBuilder;
private ImageReader mImageReader;
private CameraCaptureSession mCaptureSession;
//类初始化时，不初始化这个对象(延时加载，真正用的时候再创建)
private static MSCameraTextureViewManager instance;
//构造器私有化
private MSCameraTextureViewManager() {
}
//方法同步，调用效率低
public static synchronized MSCameraTextureViewManager getInstance() {
if (instance == null) {
instance = new MSCameraTextureViewManager();
}
return instance;
}
public void initCamera(Activity context, AutoFitTextureView autoFitTextureView, boolean isFaceAi) {
this.mAutoFitTextureView = autoFitTextureView;
this.mContext = context;
this.mIsFaceAi = isFaceAi;
if (isFaceAi) {
mCameraId = CAMERA_FRONT;
} else {
mCameraId = CAMERA_BACK;
}
setListener();
}
private void setListener() {
mAutoFitTextureView.setSurfaceTextureListener(textureListener);
}
public void closeCamera() {
if (null != mCaptureSession) {
mCaptureSession.close();
mCaptureSession = null;
}
if (null != mCameraDevice) {
mCameraDevice.close();
mCameraDevice = null;
}
if (null != mImageReader) {
mImageReader.close();
mImageReader = null;
}
}
public void switchCamera() {
if (mCameraId.equals(CAMERA_FRONT)) {
mCameraId = CAMERA_BACK;
closeCamera();
reopenCamera();
} else if (mCameraId.equals(CAMERA_BACK)) {
mCameraId = CAMERA_FRONT;
closeCamera();
reopenCamera();
}
}
public void reopenCamera() {
if (mAutoFitTextureView.isAvailable()) {
openCamera();
} else {
mAutoFitTextureView.setSurfaceTextureListener(textureListener);
}
}
// Surface状态回调
TextureView.SurfaceTextureListener textureListener = new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
setupCamera(width, height);
configureTransform(width, height);
openCamera();
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
configureTransform(width, height);
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
};
private void openCamera() {
//获取摄像头的管理者CameraManager
CameraManager manager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
//检查权限
try {
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
return;
}
//打开相机，第一个参数指示打开哪个摄像头，第二个参数stateCallback为相机的状态回调接口，第三个参数用来确定Callback在哪个线程执行，为null的话就在当前线程执行
manager.openCamera(mCameraId, stateCallback, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void configureTransform(int viewWidth, int viewHeight) {
if (null == mAutoFitTextureView || null == mPreviewSize) {
return;
}
int rotation = mContext.getWindowManager().getDefaultDisplay().getRotation();
Matrix matrix = new Matrix();
RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
float centerX = viewRect.centerX();
float centerY = viewRect.centerY();
if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
float scale = Math.max(
(float) viewHeight / mPreviewSize.getHeight(),
(float) viewWidth / mPreviewSize.getWidth());
matrix.postScale(scale, scale, centerX, centerY);
matrix.postRotate(90 * (rotation - 2), centerX, centerY);
} else if (Surface.ROTATION_180 == rotation) {
matrix.postRotate(180, centerX, centerY);
}
mAutoFitTextureView.setTransform(matrix);
}
// 摄像头状态回调
private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
mCameraDevice = camera;
//开启预览
startPreview();
}
@Override
public void onDisconnected(@NonNull CameraDevice camera) {
Log.i(TAG, "CameraDevice Disconnected");
}
@Override
public void onError(@NonNull CameraDevice camera, int error) {
Log.e(TAG, "CameraDevice Error");
}
};
private void startPreview() {
setupImageReader();
SurfaceTexture mSurfaceTexture = mAutoFitTextureView.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
mPreviewSurface = new Surface(mSurfaceTexture);
try {
getPreviewRequestBuilder();
//创建相机捕获会话，第一个参数是捕获数据的输出Surface列表，第二个参数是CameraCaptureSession的状态回调接口，当它创建好后会回调onConfigured方法，第三个参数用来确定Callback在哪个线程执行，为null的话就在当前线程执行
mCameraDevice.createCaptureSession(Arrays.asList(mPreviewSurface, mImageReader.getSurface()), new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
mCaptureSession = session;
repeatPreview();
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
}
}, 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
mImageReader = ImageReader.newInstance(mPreviewSize.getWidth(), mPreviewSize.getHeight(), ImageFormat.JPEG, 1);
//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() {
@Override
public void onImageAvailable(ImageReader reader) {
Log.i(TAG, "Image Available!");
Image image = reader.acquireLatestImage();
// 开启线程异步保存图片
new Thread(new ImageSaver(image)).start();
}
}, null);
}
private void repeatPreview() {
mPreviewRequestBuilder.setTag(TAG_PREVIEW);
mPreviewRequest = mPreviewRequestBuilder.build();
//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
try {
mCaptureSession.setRepeatingRequest(mPreviewRequest, mPreviewCaptureCallback, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private CameraCaptureSession.CaptureCallback mPreviewCaptureCallback = new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
}
@Override
public void onCaptureProgressed(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull CaptureResult partialResult) {
}
};
// 创建预览请求的Builder（TEMPLATE_PREVIEW表示预览请求）
private void getPreviewRequestBuilder() {
try {
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
} catch (CameraAccessException e) {
e.printStackTrace();
}
//设置预览的显示界面
mPreviewRequestBuilder.addTarget(mPreviewSurface);
MeteringRectangle[] meteringRectangles = mPreviewRequestBuilder.get(CaptureRequest.CONTROL_AF_REGIONS);
if (meteringRectangles != null && meteringRectangles.length > 0) {
Log.d(TAG, "PreviewRequestBuilder: AF_REGIONS=" + meteringRectangles[0].getRect().toString());
}
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
}
private void setupCamera(int width, int height) {
// 获取摄像头的管理者CameraManager
CameraManager manager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
try {
String[] cameraIdList = manager.getCameraIdList();
if (cameraIdList == null || cameraIdList.length == 0) return;
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
mPreviewSize = getOptimalSize(map.getOutputSizes(SurfaceTexture.class), width, height);
int orientation = mContext.getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
mAutoFitTextureView.setAspectRatio(mPreviewSize.getWidth(), mPreviewSize.getHeight());
} else {
mAutoFitTextureView.setAspectRatio(mPreviewSize.getHeight(), mPreviewSize.getWidth());
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
// 选择sizeMap中大于并且最接近width和height的size
private Size getOptimalSize(Size[] sizeMap, int width, int height) {
List<Size> sizeList = new ArrayList<>();
for (Size option : sizeMap) {
if (width > height) {
if (option.getWidth() > width && option.getHeight() > height) {
sizeList.add(option);
}
} else {
if (option.getWidth() > height && option.getHeight() > width) {
sizeList.add(option);
}
}
}
if (sizeList.size() > 0) {
return Collections.min(sizeList, new Comparator<Size>() {
@Override
public int compare(Size lhs, Size rhs) {
return Long.signum(lhs.getWidth() * lhs.getHeight() - rhs.getWidth() * rhs.getHeight());
}
});
}
return sizeMap[0];
}
public static class ImageSaver implements Runnable {
private Image mImage;
public ImageSaver(Image image) {
mImage = image;
}
@Override
public void run() {
ByteBuffer buffer = mImage.getPlanes()[0].getBuffer();
byte[] data = new byte[buffer.remaining()];
buffer.get(data);
File imageFile = new File(Environment.getExternalStorageDirectory() + "/DCIM/myPicture.jpg");
FileOutputStream fos = null;
try {
fos = new FileOutputStream(imageFile);
fos.write(data, 0, data.length);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
AutoFitTextureView.java
import android.content.Context;
import android.util.AttributeSet;
import android.view.TextureView;
public class AutoFitTextureView extends TextureView {
private int mRatioWidth = 0;
private int mRatioHeight = 0;
public AutoFitTextureView(Context context) {
this(context, null);
}
public AutoFitTextureView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public AutoFitTextureView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
/**
* Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
* calculated from the parameters. Note that the actual sizes of parameters don't matter, that
* is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
*
* @param width Relative horizontal size
* @param height Relative vertical size
*/
public void setAspectRatio(int width, int height) {
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Size cannot be negative.");
}
mRatioWidth = width;
mRatioHeight = height;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width, height);
} else {
if (width < height * mRatioWidth / mRatioHeight) {
setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
} else {
setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
}
}
}
}
