android - Android openCV 相机无法正常工作

Question

我正在尝试进入适用于 android 的 openCV。所以我开始看教程，最后让 openCV 在我的 android 应用程序上工作。

所以相机预览中的问题看起来像这样：

我在 logcat 中发现的唯一内容是：

2019-09-29 00:56:36.458 28721-28721/de.corestudio.opencvtest E/OpenCV/StaticHelper: OpenCV error: Cannot load info library for OpenCV

2019-09-29 00:56:41.244 28721-28742/de.corestudio.opencvtest E/libc: Access denied finding property "vendor.camera.aux.packagelist"

2019-09-29 00:56:36.546 28721-28721/de.corestudio.opencvtest E/libc: Access denied finding property "persist.vendor.camera.privapp.list"

所以我试图修复它们，但我发现没有修复它们。

我的 main_activity.xml 看起来像这样：

  <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout 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"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        tools:context=".MainActivity">

    <org.opencv.android.JavaCamera2View
        android:id="@+id/myCameraView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:show_fps="true"/>

    </LinearLayout>

还有我的 MainActivity.java

    public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2 {

    CameraBridgeViewBase cameraBridgeViewBase;
    Mat mat1, mat2, mat3;
    BaseLoaderCallback baseLoaderCallback;


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

        if(permission()){
            cameraBridgeViewBase = findViewById(R.id.myCameraView);
            cameraBridgeViewBase.setVisibility(SurfaceView.VISIBLE);
            cameraBridgeViewBase.setCvCameraViewListener(this);

            baseLoaderCallback = new BaseLoaderCallback(this) {
                @Override
                public void onManagerConnected(int status) {

                    switch (status){
                        case BaseLoaderCallback.SUCCESS:
                            cameraBridgeViewBase.enableView();
                            Toast.makeText(mAppContext, "Success", 
    Toast.LENGTH_SHORT).show();
                            break;
                        default:
                            super.onManagerConnected(status);
                            Toast.makeText(mAppContext, "Failure", 
    Toast.LENGTH_SHORT).show();
                            break;
                    }
                }
            };
        }


    }

    @Override
    public void onCameraViewStarted(int width, int height) {
        mat1 = new Mat(width,height, CvType.CV_8UC4);
        mat2 = new Mat(width,height,CvType.CV_8UC4);
        mat3 = new Mat(width,height,CvType.CV_8UC4);

    }

    @Override
    public void onCameraViewStopped() {
        mat1.release();
        mat2.release();
        mat3.release();
    }

    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) 
    {

        mat1 = inputFrame.rgba();

        return mat1;
    }

    @Override
    protected void onPause() {
        super.onPause();
        if(cameraBridgeViewBase!= null){
            cameraBridgeViewBase.disableView();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        super.onPause();
        if(!OpenCVLoader.initDebug()){
            Toast.makeText(this, "There are problems due OpenCV", 
    Toast.LENGTH_SHORT).show();
        }else{
            baseLoaderCallback.onManagerConnected(BaseLoaderCallback.SUCCESS);
        }
    }

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

    private boolean permission(){
        if (ContextCompat.checkSelfPermission(MainActivity.this, 
    Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[] 
    {Manifest.permission.CAMERA},
        50);
        }else{
            return true;
        }
        return false;
    }
    

Answer 1

只需将 JavaCamera2View 更改为 JavaCameraView

Answer 2

我在android 10中遇到过类似的问题。经过大量的试验和错误，我发现必须在主活动中实现以下方法：

@Override
protected List<? extends CameraBridgeViewBase> getCameraViewList() {
        return Collections.singletonList(mOpenCvCameraView);
    }