Android Camera、Camera2使用

Android Camera、Camera2详解

前言

Android5.0之前使用android.hardware包下的Camera类进行拍照、录视频等功能。5.0以后，新增了android.hardware.camera2包，利用新的机制、新的类进行拍照、录视频。

camera使用

摄像头权限自己去AndroidMainfest.xml配置就行了
直接上代码工具类
下面展示一些 代码。

package com.tony.sonicinspection.ui.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.WindowManager;

import com.serenegiant.widget.Camera2Helper;
import com.tony.sonicinspection.App;
import com.tony.sonicinspection.Const;
import com.tony.sonicinspection.bean.eventbean.CameraPicPathEventBean;
import com.tony.sonicinspection.utils.ImageUtil;

import org.greenrobot.eventbus.EventBus;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;

/**
 * **************************************************************************************************
 * 修改日期                    功能或Bug描述      作者
 * 2021/08/02               TextureView类目	     ljh
 * **************************************************************************************************
 */
public class MyTextureView extends TextureView implements View.OnLayoutChangeListener {
   
    public Camera mCamera;
    private Context context;
    private Camera.Parameters param;
    private boolean isCanTakePicture = false;
    int mWidth = 0;
    int mHeight = 0;
    int mDisplayWidth = 0;
    int mDisplayHeight = 0;
    int mPreviewWidth = 540;
    int mPreviewHeight = 399;
    public MyTextureView(Context context, AttributeSet attrs) {
   
        super(context, attrs);
        this.context = context;
        init();
    }

    private void init() {
   
        if (null == mCamera) {
   
            mCamera = Camera.open();
        }
        this.setSurfaceTextureListener(new SurfaceTextureListener() {
   
            @Override
            public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
   
                param = mCamera.getParameters();
                param.setPreviewFpsRange(4,10);
                param.getPictureSize().width = mPreviewWidth;
                param.getPictureSize().height = mPreviewHeight;
//param.setPictureSize(mPreviewWidth,mPreviewHeight);这么写会报错，有想法的可以去查查代码学习学习
                param.setPictureFormat(PixelFormat.JPEG);
                param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                param.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);// 1连续对焦
                mCamera.setParameters(param);
                //变形处理
                RectF previewRect = new RectF(0, 0, mPreviewWidth, mPreviewHeight);
                RectF surfaceDimensions = new RectF(0, 0, mPreviewWidth, 960);
                Matrix matrix = new Matrix();
                matrix.setRectToRect(previewRect, surfaceDimensions, Matrix.ScaleToFit.FILL);
                MyTextureView.this.setTransform(matrix);
                //<-处理变形 处理旋转
                int displayRotation = 0;
                WindowManager windowManager = (WindowManager) context
                        .getSystemService(Context.WINDOW_SERVICE);
                int rotation = windowManager.getDefaultDisplay().getRotation();
                switch (rotation) {
   
                    case Surface.ROTATION_0:
                        displayRotation = 0;
                        break;
                    case Surface.ROTATION_90:
                        displayRotation = 90;
                        break;
                    case Surface.ROTATION_180:
                        displayRotation = 180;
                        break;
                    case Surface.ROTATION_270:
                        displayRotation = 270;
                        break;
                }
                Camera.CameraInfo info = new Camera.CameraInfo();
                Camera.getCameraInfo(0, info);
                //设置方向
                int orientation;
                if (info.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
   
                    orientation = (info.orientation - displayRotation + 360) % 360;
                } else {
   
                    orientation = (info.orientation + displayRotation) % 360;
                    orientation = (360 - orientation) % 360;
                }
                mCamera.setParameters(param);
                mCamera.setDisplayOrientation(orientation);
                try {
   
                    mCamera.setPreviewTexture(surfaceTexture);
                    mCamera.startPreview();
                    isCanTakePicture = true;
                } catch (Exception e) {
   
                    e.printStackTrace();
                }

            }

            @Override
            public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height) {
   

            }

            @Override
            public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
   
                if