1.权限设置

任何版本的安卓应用，所需的权限都要首先在AndroidManifest.xml声明

<uses-permission android:name="android.permission.INTERNET" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <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" />

由于安卓版本关系，Android6之后需要运行时获取权限，这里使用第三方库permissionsdispatcher，
Github：https://github.com/permissions-dispatcher/PermissionsDispatcher
使用教程：
1.依赖PermissionsDispatcher库，在build.gradle(app)里添加：

dependencies {    implementation fileTree(dir: "libs", include: ["*.jar"])    implementation 'androidx.appcompat:appcompat:1.1.0'    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'    implementation project(path: ':OpenCV')    testImplementation 'junit:junit:4.12'    androidTestImplementation 'androidx.test.ext:junit:1.1.1'    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'    //引入PermissionsDispatcher库    implementation 'com.github.hotchemi:permissionsdispatcher:3.2.0'    annotationProcessor 'com.github.hotchemi:permissionsdispatcher-processor:3.2.0'}

2.在需要获取动态权限的Activity或者Fragment,添加必要注解：
@RuntimePermissions
@NeedsPermission将所需的权限获取后，再进行下一步操作。

2.实现人脸检测

编写布局文件，加入摄像头预览控件JavaCameraView，

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    xmlns:opencv="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">        <org.opencv.android.JavaCameraView        android:id="@+id/cameraView"        android:layout_width="match_parent"        android:layout_height="match_parent"        opencv:camera_id="any" /></androidx.constraintlayout.widget.ConstraintLayout>

在AndroidManifest.xml声明activity,设置横屏

<activity android:name=".MainActivity"        android:theme="@style/Theme.AppCompat.NoActionBar"        android:screenOrientation="landscape"        >        <intent-filter>            <action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" />        </intent-filter>    </activity>

添加libc++_shared.so，这个我在网上的其他博客并没有看到，但我这边集成时，确实需要，应该是其内部封装通过一些jni接口调用c++算法时需要集成的一个so，我上传了armeabi-v7a的libc++_shared.so，下面是下载地址：
https://download.csdn.net/download/u013370255/12609010
加入模型文件lbpcascade_frontalface_improved.xml
文件来自于…\opencv-4.3.0-android-sdk\OpenCV-android-sdk\sdk\etc\lbpcascades
主显示界面mainActivity

package com.zhb.opencvdemo;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import android.Manifest;import android.content.Context;import android.os.Bundle;import android.util.Log;import android.view.SurfaceView;import org.opencv.android.BaseLoaderCallback;import org.opencv.android.CameraBridgeViewBase;import org.opencv.android.LoaderCallbackInterface;import org.opencv.android.OpenCVLoader;import org.opencv.core.Core;import org.opencv.core.Mat;import org.opencv.core.Point;import org.opencv.objdetect.CascadeClassifier;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import permissions.dispatcher.NeedsPermission;import permissions.dispatcher.RuntimePermissions;@RuntimePermissionspublic class MainActivity extends AppCompatActivity {    //预览图    CameraBridgeViewBase mOpenCvCameraView;    //模型文件    File mCascadeFile;    //级联分类器    private CascadeClassifier cascadeClassifier = null;    //4通道的图片矩阵，彩图    Mat mRgba;    //单通道的图片矩阵，灰图    Mat mGray;    //摄像头索引：-1/0后置摄像头，1前置摄像头    private int mCameraIndex = 1;    // 使用opencv自带的分类器文件初始化    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {        @Override        public void onManagerConnected(int status) {            switch (status) {                case LoaderCallbackInterface.SUCCESS: {                    try {                        InputStream is = getResources().openRawResource(R.raw.lbpcascade_frontalface_improved);                        File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);                        mCascadeFile = new File(cascadeDir, "lbpcascade_frontalface_improved.xml");                        FileOutputStream os = new FileOutputStream(mCascadeFile);                        byte[] buffer = new byte[4096];                        int bytesRead;                        while ((bytesRead = is.read(buffer)) != -1) {                            os.write(buffer, 0, bytesRead);                        }                        is.close();                        os.close();                        // 加载cascadeClassifier                        cascadeClassifier = new CascadeClassifier(mCascadeFile.getAbsolutePath());                        cascadeDir.delete();                    } catch (IOException e) {                        e.printStackTrace();                    }                                        //启用相机                    mOpenCvCameraView.setCameraPermissionGranted();                    mOpenCvCameraView.enableView();                }                break;                default: {                    super.onManagerConnected(status);                }            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mOpenCvCameraView = findViewById(R.id.cameraView);        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);        //摄像头索引-1/0：后置双摄1：前置        mOpenCvCameraView.setCameraIndex(mCameraIndex);        //openCV预览界面监听        mOpenCvCameraView.setCvCameraViewListener(new CameraBridgeViewBase.CvCameraViewListener2() {            @Override            public void onCameraViewStarted(int width, int height) {            }            @Override            public void onCameraViewStopped() {                mRgba.release();                mGray.release();            }            @Override            public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {                mRgba = inputFrame.rgba();                mGray = inputFrame.gray();                return mRgba;            }        });    }    @Override    public void onPause() {        super.onPause();        disableCamera();    }    @Override    public void onResume() {        super.onResume();        MainActivityPermissionsDispatcher.showCameraWithPermissionCheck(this);    }    @Override    public void onDestroy() {        super.onDestroy();        disableCamera();    }    public void disableCamera() {        if (mOpenCvCameraView != null)            mOpenCvCameraView.disableView();    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        // NOTE: delegate the permission handling to generated method        MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);    }    @NeedsPermission({            Manifest.permission.CAMERA,            Manifest.permission.WRITE_EXTERNAL_STORAGE,            Manifest.permission.READ_EXTERNAL_STORAGE})    void showCamera() {        //OpenCV初始化        if (!OpenCVLoader.initDebug()) {            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, this, mLoaderCallback);        } else {            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);        }    }}

Android(安卓)OpenCV使用2_使用OpenCV并进行人脸检测

1.权限设置

2.实现人脸检测

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