在Android studio 中使用opencv，不用安装手机上的opencv。附上opencv调用摄像头并处理图像的例程。

1.首先，导入opencv for android
请参考这篇文章：导入opencv包
链接：https://blog.csdn.net/qq_39321542/article/details/106080136
2.将opencv实例化
需要在程序的最前面加上：

private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
      	  @Override
      	  public void onManagerConnected(int status) {
       	     switch(status){
        	        case LoaderCallbackInterface.SUCCESS:
         	       {
            	        Log.d(TAG,"OpenCV loaded successfully");//打印日志，TAG定义为String
            	        mOpenCvCameraView.enableView();//可替换为自己的函数，不必须
           	     }break;
             	   default:
              	  {
               	     super.onManagerConnected(status);
             	   }break;
          	  }
       	 }
   	 };

需要重点说明的是，如果直接复制这段代码，手机依然显示让你安装opencv，可能需要自己抄写这段代码。（我就遇到过这种问题）
这些程序请自己选择需要的
1.AndroidManifest.xml文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.opencvtest"
>

    <application
        android:label="@string/app_name"
        android:icon="@drawable/icon">
<!--强制横屏显示,捕获手机状态，“keyboardHidden“ 用户打开手机硬件键盘，“orientation“ 设备旋转，横向显示和竖向显示模式切换。-->
        <activity android:name="ImageManipulationsActivity"
                  android:label="@string/app_name"
                  android:screenOrientation="landscape"
                  android:configChanges="keyboardHidden|orientation">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

    <supports-screens android:resizeable="true"
                      android:smallScreens="true"
                      android:normalScreens="true"
                      android:largeScreens="true"
                      android:anyDensity="true" />

    <uses-permission android:name="android.permission.CAMERA"/>

    <uses-feature android:name="android.hardware.camera" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.front" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>

</manifest>

2.布局文件（image_manipulations_surface_view.xml）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/image_manipulations_activity_surface_view" />

</LinearLayout>

public class ImageManipulationsActivity extends CameraActivity implements CvCameraViewListener2 {
    private static final String  TAG                 = "OCVSample::Activity";

    public static final int      VIEW_MODE_RGBA      = 0;//彩图
    public static final int      VIEW_MODE_HIST      = 1;//显示具体颜色比例
    public static final int      VIEW_MODE_CANNY     = 2;//黑色边缘
    public static final int      VIEW_MODE_SEPIA     = 3;//褐色
    public static final int      VIEW_MODE_SOBEL     = 4;//黑色虚化
    public static final int      VIEW_MODE_ZOOM      = 5;//小框显示
    public static final int      VIEW_MODE_PIXELIZE  = 6;//模糊
    public static final int      VIEW_MODE_POSTERIZE = 7;//细微模糊

    private MenuItem             mItemPreviewRGBA;
    private MenuItem             mItemPreviewHist;
    private MenuItem             mItemPreviewCanny;
    private MenuItem             mItemPreviewSepia;
    private MenuItem             mItemPreviewSobel;
    private MenuItem             mItemPreviewZoom;
    private MenuItem             mItemPreviewPixelize;
    private MenuItem             mItemPreviewPosterize;
    private CameraBridgeViewBase mOpenCvCameraView;//定义显示图片变量

    private Size                 mSize0;//函数

    private Mat                  mIntermediateMat;
    private Mat                  mMat0;
    private MatOfInt             mChannels[];//opencv.core。类
    private MatOfInt             mHistSize;
    private int                  mHistSizeNum = 25;//
    private MatOfFloat           mRanges;
    private Scalar               mColorsRGB[];//颜色变量
    private Scalar               mColorsHue[];
    private Scalar               mWhilte;
    private Point                mP1;
    private Point                mP2;
    private float                mBuff[];
    private Mat                  mSepiaKernel;

    public static int           viewMode = VIEW_MODE_RGBA;//相机模式
//实例化opencv，必须要有。为了支持opencv与app相互作用
    private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
                case LoaderCallbackInterface.SUCCESS:
                {
                    Log.i(TAG, "OpenCV loaded successfully");
                    mOpenCvCameraView.enableView();
                } break;
                default:
                {
                    super.onManagerConnected(status);
                } break;
            }
        }
    };
//主函数
    public ImageManipulationsActivity() {
        Log.i(TAG, "Instantiated new " + this.getClass());
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//设置窗体始终点亮，不熄屏

        setContentView(R.layout.image_manipulations_surface_view);

        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.image_manipulations_activity_surface_view);
        mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
        mOpenCvCameraView.setCvCameraViewListener(this);//设置界面监听
    }
//当活动停止时调用该函数，也就是系统去调用另一个活动
    @Override
    public void onPause()
    {
        super.onPause();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }
//当活动准备好与用户进行交互时调用，此时活动位于栈顶，并处于运行状态
    @Override
    public void onResume()
    {
        super.onResume();
        if (!OpenCVLoader.initDebug()) {
            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
        } else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }
//用来接受系统的view列表
    @Override
    protected List<? extends CameraBridgeViewBase> getCameraViewList() {
        return Collections.singletonList(mOpenCvCameraView);
    }
//在活动被销毁前调用
    public void onDestroy() {
        super.onDestroy();
        if (mOpenCvCameraView != null)
            mOpenCvCameraView.disableView();
    }
//创建选项
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        Log.i(TAG, "called onCreateOptionsMenu");
        mItemPreviewRGBA  = menu.add("Preview RGBA");
        mItemPreviewHist  = menu.add("Histograms");
        mItemPreviewCanny = menu.add("Canny");
        mItemPreviewSepia = menu.add("Sepia");
        mItemPreviewSobel = menu.add("Sobel");
        mItemPreviewZoom  = menu.add("Zoom");
        mItemPreviewPixelize  = menu.add("Pixelize");
        mItemPreviewPosterize = menu.add("Posterize");
        return true;
    }
//监控选项卡
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
        if (item == mItemPreviewRGBA)
            viewMode = VIEW_MODE_RGBA;
        if (item == mItemPreviewHist)
            viewMode = VIEW_MODE_HIST;
        else if (item == mItemPreviewCanny)
            viewMode = VIEW_MODE_CANNY;
        else if (item == mItemPreviewSepia)
            viewMode = VIEW_MODE_SEPIA;
        else if (item == mItemPreviewSobel)
            viewMode = VIEW_MODE_SOBEL;
        else if (item == mItemPreviewZoom)
            viewMode = VIEW_MODE_ZOOM;
        else if (item == mItemPreviewPixelize)
            viewMode = VIEW_MODE_PIXELIZE;
        else if (item == mItemPreviewPosterize)
            viewMode = VIEW_MODE_POSTERIZE;
        return true;
    }
//当界面准备好交互时调用该函数，完成初始化给变量分配空间
    public void onCameraViewStarted(int width, int height) {
        mIntermediateMat = new Mat();
        mSize0 = new Size();
        mChannels = new MatOfInt[] { new MatOfInt(0), new MatOfInt(1), new MatOfInt(2) };
        mBuff = new float[mHistSizeNum];
        mHistSize = new MatOfInt(mHistSizeNum);
        mRanges = new MatOfFloat(0f, 256f);
        mMat0  = new Mat();
        mColorsRGB = new Scalar[] { new Scalar(200, 0, 0, 255), new Scalar(0, 200, 0, 255), new Scalar(0, 0, 200, 255) };
        mColorsHue = new Scalar[] {
                new Scalar(255, 0, 0, 255),   new Scalar(255, 60, 0, 255),  new Scalar(255, 120, 0, 255), new Scalar(255, 180, 0, 255), new Scalar(255, 240, 0, 255),
                new Scalar(215, 213, 0, 255), new Scalar(150, 255, 0, 255), new Scalar(85, 255, 0, 255),  new Scalar(20, 255, 0, 255),  new Scalar(0, 255, 30, 255),
                new Scalar(0, 255, 85, 255),  new Scalar(0, 255, 150, 255), new Scalar(0, 255, 215, 255), new Scalar(0, 234, 255, 255), new Scalar(0, 170, 255, 255),
                new Scalar(0, 120, 255, 255), new Scalar(0, 60, 255, 255),  new Scalar(0, 0, 255, 255),   new Scalar(64, 0, 255, 255),  new Scalar(120, 0, 255, 255),
                new Scalar(180, 0, 255, 255), new Scalar(255, 0, 255, 255), new Scalar(255, 0, 215, 255), new Scalar(255, 0, 85, 255),  new Scalar(255, 0, 0, 255)
        };
        mWhilte = Scalar.all(255);
        mP1 = new Point();
        mP2 = new Point();

        // Fill sepia kernel
        mSepiaKernel = new Mat(4, 4, CvType.CV_32F);
        mSepiaKernel.put(0, 0, /* R */0.189f, 0.769f, 0.393f, 0f);
        mSepiaKernel.put(1, 0, /* G */0.168f, 0.686f, 0.349f, 0f);
        mSepiaKernel.put(2, 0, /* B */0.131f, 0.534f, 0.272f, 0f);
        mSepiaKernel.put(3, 0, /* A */0.000f, 0.000f, 0.000f, 1f);
    }
//当摄像头停止时调用，释放空间
    public void onCameraViewStopped() {
        // Explicitly deallocate Mats
        if (mIntermediateMat != null)
            mIntermediateMat.release();

        mIntermediateMat = null;
    }
//在回调中调用这个函数，用于处理图片
    public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
        Mat rgba = inputFrame.rgba();//图像转为这个
        Size sizeRgba = rgba.size();//得到图像的尺寸

        Mat rgbaInnerWindow;

        int rows = (int) sizeRgba.height;//得到图像的高
        int cols = (int) sizeRgba.width;//宽

        int left = cols / 8;
        int top = rows / 8;

        int width = cols * 3 / 4;
        int height = rows * 3 / 4;

        switch (ImageManipulationsActivity.viewMode) {
        case ImageManipulationsActivity.VIEW_MODE_RGBA://显示原图
            break;

        case ImageManipulationsActivity.VIEW_MODE_HIST://显示具体颜色比例
            Mat hist = new Mat();
            int thikness = (int) (sizeRgba.width / (mHistSizeNum + 10) / 5);
            if(thikness > 5) thikness = 5;
            int offset = (int) ((sizeRgba.width - (5*mHistSizeNum + 4*10)*thikness)/2);
            // RGB
            for(int c=0; c<3; c++) {
                Imgproc.calcHist(Arrays.asList(rgba), mChannels[c], mMat0, hist, mHistSize, mRanges);//计算直方图
                Core.normalize(hist, hist, sizeRgba.height/2, 0, Core.NORM_INF);//矩阵归一化
                hist.get(0, 0, mBuff);
                for(int h=0; h<mHistSizeNum; h++) {
                    mP1.x = mP2.x = offset + (c * (mHistSizeNum + 10) + h) * thikness;
                    mP1.y = sizeRgba.height-1;
                    mP2.y = mP1.y - 2 - (int)mBuff[h];
                    Imgproc.line(rgba, mP1, mP2, mColorsRGB[c], thikness);//画图
                }
            }
            // Value and Hue
            Imgproc.cvtColor(rgba, mIntermediateMat, Imgproc.COLOR_RGB2HSV_FULL);//设置颜色
            // Value
            Imgproc.calcHist(Arrays.asList(mIntermediateMat), mChannels[2], mMat0, hist, mHistSize, mRanges);
            Core.normalize(hist, hist, sizeRgba.height/2, 0, Core.NORM_INF);
            hist.get(0, 0, mBuff);
            for(int h=0; h<mHistSizeNum; h++) {
                mP1.x = mP2.x = offset + (3 * (mHistSizeNum + 10) + h) * thikness;
                mP1.y = sizeRgba.height-1;
                mP2.y = mP1.y - 2 - (int)mBuff[h];
                Imgproc.line(rgba, mP1, mP2, mWhilte, thikness);
            }
            // Hue
            Imgproc.calcHist(Arrays.asList(mIntermediateMat), mChannels[0], mMat0, hist, mHistSize, mRanges);
            Core.normalize(hist, hist, sizeRgba.height/2, 0, Core.NORM_INF);
            hist.get(0, 0, mBuff);
            for(int h=0; h<mHistSizeNum; h++) {
                mP1.x = mP2.x = offset + (4 * (mHistSizeNum + 10) + h) * thikness;
                mP1.y = sizeRgba.height-1;
                mP2.y = mP1.y - 2 - (int)mBuff[h];
                Imgproc.line(rgba, mP1, mP2, mColorsHue[h], thikness);
            }
            break;

        case ImageManipulationsActivity.VIEW_MODE_CANNY://黑色边缘
            rgbaInnerWindow = rgba.submat(top, top + height, left, left + width);
            Imgproc.Canny(rgbaInnerWindow, mIntermediateMat, 80, 90);
            Imgproc.cvtColor(mIntermediateMat, rgbaInnerWindow, Imgproc.COLOR_GRAY2BGRA, 4);
            rgbaInnerWindow.release();
            break;

        case ImageManipulationsActivity.VIEW_MODE_SOBEL://黑色虚化
            Mat gray = inputFrame.gray();
            Mat grayInnerWindow = gray.submat(top, top + height, left, left + width);
            rgbaInnerWindow = rgba.submat(top, top + height, left, left + width);
            Imgproc.Sobel(grayInnerWindow, mIntermediateMat, CvType.CV_8U, 1, 1);
            Core.convertScaleAbs(mIntermediateMat, mIntermediateMat, 10, 0);
            Imgproc.cvtColor(mIntermediateMat, rgbaInnerWindow, Imgproc.COLOR_GRAY2BGRA, 4);
            grayInnerWindow.release();
            rgbaInnerWindow.release();
            break;

        case ImageManipulationsActivity.VIEW_MODE_SEPIA://图片为褐色，复古
            rgbaInnerWindow = rgba.submat(top, top + height, left, left + width);
            Core.transform(rgbaInnerWindow, rgbaInnerWindow, mSepiaKernel);
            rgbaInnerWindow.release();
            break;

        case ImageManipulationsActivity.VIEW_MODE_ZOOM://加上一个小框显示
            Mat zoomCorner = rgba.submat(0, rows / 2 - rows / 10, 0, cols / 2 - cols / 10);
            Mat mZoomWindow = rgba.submat(rows / 2 - 9 * rows / 100, rows / 2 + 9 * rows / 100, cols / 2 - 9 * cols / 100, cols / 2 + 9 * cols / 100);
            Imgproc.resize(mZoomWindow, zoomCorner, zoomCorner.size(), 0, 0, Imgproc.INTER_LINEAR_EXACT);
            Size wsize = mZoomWindow.size();
            Imgproc.rectangle(mZoomWindow, new Point(1, 1), new Point(wsize.width - 2, wsize.height - 2), new Scalar(255, 0, 0, 255), 2);
            zoomCorner.release();
            mZoomWindow.release();
            break;

        case ImageManipulationsActivity.VIEW_MODE_PIXELIZE://模糊图像
            rgbaInnerWindow = rgba.submat(top, top + height, left, left + width);
            Imgproc.resize(rgbaInnerWindow, mIntermediateMat, mSize0, 0.1, 0.1, Imgproc.INTER_NEAREST);
            Imgproc.resize(mIntermediateMat, rgbaInnerWindow, rgbaInnerWindow.size(), 0., 0., Imgproc.INTER_NEAREST);
            rgbaInnerWindow.release();
            break;

        case ImageManipulationsActivity.VIEW_MODE_POSTERIZE://细微的模糊图像
            /*
            Imgproc.cvtColor(rgbaInnerWindow, mIntermediateMat, Imgproc.COLOR_RGBA2RGB);
            Imgproc.pyrMeanShiftFiltering(mIntermediateMat, mIntermediateMat, 5, 50);
            Imgproc.cvtColor(mIntermediateMat, rgbaInnerWindow, Imgproc.COLOR_RGB2RGBA);
            */
            rgbaInnerWindow = rgba.submat(top, top + height, left, left + width);
            Imgproc.Canny(rgbaInnerWindow, mIntermediateMat, 80, 90);
            rgbaInnerWindow.setTo(new Scalar(0, 0, 0, 255), mIntermediateMat);
            Core.convertScaleAbs(rgbaInnerWindow, mIntermediateMat, 1./16, 0);
            Core.convertScaleAbs(mIntermediateMat, rgbaInnerWindow, 16, 0);
            rgbaInnerWindow.release();
            break;
        }

        return rgba;
    }
}