Android Studio中无法调用JavaCV之Mat.get()方法

提示 Cannot resolve method 'get' in 'Mat'

看看你的项目中是不是有个多个Mat？

追进Mat 看一下里面是不是有get() 方法 或者排查一下方法得访问修饰符

这是目前MainActivity的代码

package com.example.tt1;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.File;
import java.net.URL;
import org.bytedeco.javacv.*;
import org.bytedeco.opencv.opencv_core.*;
import org.opencv.imgproc.Imgproc;

import static org.bytedeco.opencv.global.opencv_core.*;
import static org.bytedeco.opencv.global.opencv_imgproc.*;

public class MainActivity extends AppCompatActivity {

    ImageView imageView;
    Mat mat;
    
    boolean clicked = false;
    TextView txv1;

    Bitmap bitmap;
    Bitmap bitmap1;

    AndroidFrameConverter converterToBitmap;
    OpenCVFrameConverter.ToIplImage converterToIplImage;
    OpenCVFrameConverter.ToMat converterToMat;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView = (ImageView) findViewById(R.id.imgV);
        txv1=(TextView)findViewById(R.id.txv1);

        imageView.invalidate();
        BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
        bitmap = drawable.getBitmap();

        IplImage iplImage = this.bitmapToIplImage(bitmap);
        converterToBitmap = new AndroidFrameConverter();
        converterToIplImage = new OpenCVFrameConverter.ToIplImage();
        converterToMat = new OpenCVFrameConverter.ToMat();

        Frame frame = converterToBitmap.convert(bitmap);
        mat = converterToIplImage.convertToMat(frame);
        cvtColor(mat, mat, Imgproc.COLOR_RGB2GRAY);
        Frame frame1 = converterToMat.convert(mat);
        bitmap1 = converterToBitmap.convert(frame1);
    }



    public Bitmap IplImageToBitmap(IplImage iplImage) {
        Bitmap bitmap = null;
        bitmap = Bitmap.createBitmap(iplImage.width(), iplImage.height(),
                Bitmap.Config.ARGB_8888);
        bitmap.copyPixelsFromBuffer(iplImage.getByteBuffer());
        return bitmap;
    }


    public IplImage bitmapToIplImage(Bitmap bitmap) {
        IplImage iplImage;
        iplImage = IplImage.create(bitmap.getWidth(), bitmap.getHeight(),
                IPL_DEPTH_8U, 4);
        bitmap.copyPixelsToBuffer(iplImage.getByteBuffer());
        return iplImage;
    }


    public void trans(View view) {
        if(!clicked){
            imageView.setImageBitmap(bitmap1);
            clicked = !clicked;
        }else{
            imageView.setImageBitmap(bitmap);
            clicked = !clicked;
        }
    }

}