基本环境：
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:
