基于Android studio3.6的java api方式调用opencv

基本环境：

Android studio3.6

NDK:r15c（尽量使用该版本）

Opencv3.4.1 android sdk

 

操作：

(1)新建工程，选择Empty Activity，工程名为op

(2)File->New->Import Module，然后选择自己的java-opencv的相对应路径，比如，D:\Android\OpenCV-android-sdk\sdk\java

(3)修改openCVlibrary341下面的build.gradle中的，compileSdkVersion，buildToolsVersion，minSdkVersion，targetSdkVersion，使得和自己的工程下面的app/build.gradle的版本一致。

(4)修改openCVlibrary341下面的src/main中的AndroidManifest.xml中的minSdkVersion，targetSdkVersion，使得和自己的工程下面的app/build.gradle的版本一致。

(5)app/src/main/res/drawable下面增加一张图片

(6)app/src/main/res/layout中修改布局文件activity_main.xml

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/dilireba"
        android:layout_centerInParent="true"/>
    <Button
        android:id="@+id/btn_gray_process"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/img"
        android:layout_centerHorizontal="true"
        android:text="灰度化"/>"

</RelativeLayout>

(7)修改app/src/main/java/com.example.op下面的MainActivity

package com.example.op;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.imgproc.Imgproc;

public class MainActivity extends AppCompatActivity {


    Button btnProcess;
    Bitmap srcBitmap;
    Bitmap grayBitmap;
    ImageView img;
    private static boolean flag = true;
    private static boolean isFirst = true;
    private static final String TAG = "MainActivity";


    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {

        @Override
        public void onManagerConnected(int status) {
            // TODO Auto-generated method stub
            switch (status){
                case BaseLoaderCallback.SUCCESS:
                    Log.i(TAG, "baseloader success");
                    break;
                default:
                    super.onManagerConnected(status);
                    Log.i(TAG, String.valueOf(status));
                    break;
            }

        }
    };


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

        btnProcess = (Button)findViewById(R.id.btn_gray_process);
        img = (ImageView)findViewById(R.id.img);
        Log.i(TAG, "initUI sucess...");
        btnProcess.setOnClickListener(new ProcessClickListener());
    }



    public void procSrc2Gray(){
        Mat rgbMat = new Mat();
        Mat grayMat = new Mat();
        srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dilireba);
        grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Bitmap.Config.ARGB_8888);
        Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.
        Imgproc.cvtColor(rgbMat, grayMat, Imgproc.COLOR_RGB2GRAY);//rgbMat to gray grayMat
        Utils.matToBitmap(grayMat, grayBitmap); //convert mat to bitmap
        Log.i(TAG, "procSrc2Gray sucess...");
    }

    private class ProcessClickListener implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if(isFirst)
            {
                procSrc2Gray();
                isFirst = false;
            }
            if(flag){
                img.setImageBitmap(grayBitmap);
                btnProcess.setText("gray image");
                flag = false;
            }
            else{
                img.setImageBitmap(srcBitmap);
                btnProcess.setText("rgb image");
                flag = true;
            }
        }

    }


    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        //load OpenCV engine and init OpenCV library
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, getApplicationContext(), mLoaderCallback);
        Log.i(TAG, "onResume sucess load OpenCV...");

    }

}

(8)app/build.gradledependencies中增加，

implementation project(path: ':openCVLibrary341')

(9)环境变量，path中增加adb所在路径，C:\Users\xxx\AppData\Local\Android\Sdk\platform-tools

(10)命令行进入apk所在的路径D:\Android\OpenCV-android-sdk\apk，执行，

adb install OpenCV_3.4.1_Manager_3.41_x86.apk

在模拟器中安装opencv-manager，然后重启模拟器

工程目录结构：

运行：

 

The Code:

https://download.csdn.net/download/qq_14845119/12272674