Android Studio4.0导入OpenCv4.3.0的方法步骤

package com.example.opencvtext;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
 import android.util.Log;
 import android.view.Gravity;
 import android.widget.Toast;

import org.opencv.android.BaseLoaderCallback;
 import org.opencv.android.LoaderCallbackInterface;
 import org.opencv.android.OpenCVLoader;

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
//OpenCV库加载并初始化成功后的回调函数
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, "成功加载opencv");
  Toast toast = Toast.makeText(getApplicationContext(),
   "成功加载opencv！", Toast.LENGTH_LONG);
  toast.setGravity(Gravity.CENTER, 0, 0);
  toast.show();
  break;
  default:
  super.onManagerConnected(status);
  Log.i(TAG, "加载失败");
  Toast toast1 = Toast.makeText(getApplicationContext(),
   "加载失败！", Toast.LENGTH_LONG);
  toast1.setGravity(Gravity.CENTER, 0, 0);
  toast1.show();
  break;
 }

 }
};

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

@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);
 }
 } 
}