[移动开发]安卓_cv2_ that you device does not support camera(or it is locked). Applicatio will be closed

1 droidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="edu.ydk.cv">
    <!--     摄像头权限 -->
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <!-- 往SDCard写入数据的权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!-- 在SDCard读取数据的权限 -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            android:label="CVA"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

2、activity_main.xml

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    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">

    <org.opencv.android.JavaCameraView
        android:id="@+id/camera_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="bottom|center_horizontal">
        <Button
            android:id="@+id/switch_camera"
            android:layout_width="150dp"
            android:layout_height="50dp"
            android:layout_marginBottom="20dp"
            android:text="相机切换"/>
    </RelativeLayout>

</FrameLayout>

```bash
3  MainActivity.java
```

```java
package edu.ydk.cv;

import java.io.File;
import java.lang.System;

import android.content.pm.ActivityInfo;
import android.util.Log;
import java.io.InputStream;

import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;

import org.opencv.core.Size;
import android.os.Bundle;
import android.view.View;

import android.widget.Button;
import org.opencv.android.CameraBridgeViewBase;

import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;

import org.opencv.core.Core;
import android.app.Activity;
import android.view.View.OnClickListener;

import android.content.Context;
import android.view.WindowManager;
import org.opencv.core.MatOfRect;
import org.opencv.core.Rect;
import org.opencv.objdetect.CascadeClassifier;
import java.io.FileOutputStream;



//https://blog.csdn.net/linshuhe1/article/details/51208745?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-7.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-7.nonecase
public class MainActivity extends Activity implements CvCameraViewListener2{
    private String TAG = "OpenCV_Test";
    //OpenCV的相机接口
    private CameraBridgeViewBase cameraView;

    //缓存相机每帧输入的数据
    private Mat mRgba,mTmp,mRgb;

    //按钮组件
    private Button mButtonSwitchCamera;

    private CascadeClassifier classifier;
    private int mAbsoluteFaceSize = 0;
    private boolean isFrontCamera = false;

    //手动装载openCV库文件，以保证手机无需安装OpenCV Manager
    //必须有，否则initClassifier()报错;
    static {System.loadLibrary("opencv_java3");}


    /**
     * 通过OpenCV管理Android服务，异步初始化OpenCV
     */
    BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this)
    {
        @Override
        public void onManagerConnected(int status){
            switch (status)
            {
                case LoaderCallbackInterface.SUCCESS:
                    Log.i(TAG,"OpenCV loaded successfully");
                    cameraView.enableView();
                    break;
                default:
                    break;
            }
        }
    };

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

        initClassifier();    //必须先static {System.loadLibrary("opencv_java3");}
        initWindowSettings();

        cameraView = (CameraBridgeViewBase) findViewById(R.id.camera_view);

        isFrontCamera = false;
        cameraView.setCameraIndex(CameraBridgeViewBase.CAMERA_ID_BACK);

        cameraView.enableFpsMeter();   //显示帧率
        cameraView.setMaxFrameSize(1280,720);
        cameraView.setCvCameraViewListener(this);

        mButtonSwitchCamera = (Button) findViewById(R.id.switch_camera);
        mButtonSwitchCamera.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                if(R.id.switch_camera == v.getId()){
                    cameraView.disableView();

                    if (isFrontCamera) {
                        cameraView.setCameraIndex(CameraBridgeViewBase.CAMERA_ID_BACK);
                        isFrontCamera = false;
                    } else {
                        cameraView.setCameraIndex(CameraBridgeViewBase.CAMERA_ID_FRONT);
                        isFrontCamera = true;
                    }

                    cameraView.enableView();
                }
            }
        });
    }


    @Override
    public void onResume()
    {
        super.onResume();
        if (!OpenCVLoader.initDebug())
        {
            Log.d(TAG,"OpenCV library not found!");
        }
        else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    };

    @Override
    public void onDestroy()
    {
        super.onDestroy();
        if(cameraView!=null)
        {
            cameraView.disableView();
        }
    };

    //处理相机的开始
    @Override
    public void onCameraViewStarted(int width, int height)
    {
        // TODO Auto-generated method stub
        mRgba = new Mat(height, width, CvType.CV_8UC4);
        mRgb  = new Mat(height, width, CvType.CV_8UC3);
        mTmp = new Mat(height, width, CvType.CV_8UC4);
    }

    //处理相机的停止
    @Override
    public void onCameraViewStopped()
    {
        // TODO Auto-generated method stub
        mRgba.release();
        mTmp.release();
    }

    /**
     * 图像处理都写在此处,可以处理摄像机拍摄的每一帧图像
     */
    @Override
    public Mat onCameraFrame(CvCameraViewFrame inputFrame)
    {
        //mRgba = inputFrame.rgba();

        //灰化处理
        // Imgproc.cvtColor(inputFrame.gray(), mRgba, Imgproc.COLOR_GRAY2RGBA,4);

        // Canny边缘检测
        //Imgproc.Canny(inputFrame.gray(), mTmp, 80, 100);
        //Imgproc.cvtColor(mTmp, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);

//        Imgproc.cvtColor(mRgba,mRgb, Imgproc.COLOR_RGBA2RGB);
//
//        int pv = 0;
//        int channels = mRgb.channels();
//        int width = mRgb.cols();
//        int height = mRgb.rows();
//        byte[] data = new byte[channels*width*height];
//        mRgb.get(0,0,data);
//        for(int i=0;i<data.length;i++){
//            pv = data[i]&0xff;
//            pv = 255 - pv;
//            data[i] = (byte)pv;
//        }
//        mRgb.put(0,0,data);
//
//        Imgproc.cvtColor(mRgb,mRgba, Imgproc.COLOR_RGB2RGBA, 4);


        mRgba = DetectFace(inputFrame);

        //返回处理后的结果数据
        return mRgba;
    }



    // 这里执行人脸检测的逻辑, 根据OpenCV提供的例子实现(face-detection)
    //https://www.jianshu.com/p/1fc91f9c9a67
    public Mat DetectFace(CvCameraViewFrame inputFrame)
    {
        Mat _mRgba = inputFrame.rgba();
        Mat _mGray = inputFrame.gray();

        // 翻转矩阵以适配前后置摄像头
        if (isFrontCamera)
        {
            Core.flip(_mRgba, _mRgba, 1);
            Core.flip(_mGray, _mGray, 1);
        }

        float mRelativeFaceSize = 0.2f;
        if (mAbsoluteFaceSize == 0)
        {
            int height = _mGray.rows();
            if (Math.round(height * mRelativeFaceSize) > 0)
            {
                mAbsoluteFaceSize = Math.round(height * mRelativeFaceSize);
            }
        }

        MatOfRect faces = new MatOfRect();
        if (classifier != null)
            classifier.detectMultiScale(_mGray, faces, 1.1, 2, 2,
                    new Size(mAbsoluteFaceSize, mAbsoluteFaceSize), new Size());
        Rect[] facesArray = faces.toArray();
        Scalar faceRectColor = new Scalar(0, 255, 0, 255);
        for (Rect faceRect : facesArray)
            Imgproc.rectangle(_mRgba, faceRect.tl(), faceRect.br(), faceRectColor, 3);

        return _mRgba;
    }

    // 初始化窗口设置, 包括全屏、横屏、常亮
    private void initWindowSettings() {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
    }

    // 初始化人脸级联分类器，必须先初始化
    private void initClassifier() {
        try {
            InputStream is = getResources().openRawResource(R.raw.lbpcascade_frontalface);
            File cascadeDir = getDir("cascade", Context.MODE_PRIVATE);
            File cascadeFile = new File(cascadeDir, "lbpcascade_frontalface.xml");
            FileOutputStream os = new FileOutputStream(cascadeFile);

            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = is.read(buffer)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
            is.close();
            os.close();

            classifier = new CascadeClassifier(cascadeFile.getAbsolutePath());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
```