[Android] Android Stutio OPENCV 啟動相機預覽

關於Android OPENCV安裝篇請參考:

新增相機拍照權限以及相機橫向展示還有自動對焦

<uses-permission android:name="android.permission.CAMERA"/>

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

示範

XML

<android.support.constraint.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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <org.opencv.android.JavaCameraView
        android:id="@+id/java_camera_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
 />
</android.support.constraint.ConstraintLayout>

JAVA

public class focus extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2{
    JavaCameraView javaCameraView;
    static String TAG="MainActivity";
    Mat mRgba,input,imgGray;

    private MTCameraView mOpenCvCameraView;

    BaseLoaderCallback mLoaderCallBack = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            super.onManagerConnected(status);
            switch (status){
                case BaseLoaderCallback.SUCCESS:{
                    javaCameraView.enableView();
                    break;
                }
                default:{
                    super.onManagerConnected(status);
                    break;
                }
            }
        }
    };
    static {
        System.loadLibrary("native-lib");
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.focus);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//螢幕保持橫向
        javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
        javaCameraView.setCvCameraViewListener(this);
        javaCameraView.setFocusable(true);
        javaCameraView.enableView();
    }
        //取得手機螢幕控制
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            getWindow().getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION    //影藏狀態欄和標題欄
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION    //全頻顯示
                            | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);     //影藏手機虛擬按鍵HOME/BACK/LIST
        }
    }
    synchronized void start() {
        try {
        } catch (RuntimeException re) {
            Log.w(TAG, "Unexpected exception while focusing", re);
        }
    }
    @Override
    protected void onPause(){
        super.onPause();
        if(javaCameraView!=null)
            javaCameraView.disableView();
    }
    @Override
    protected void onDestroy(){
        super.onDestroy();
        if(javaCameraView!=null)
            javaCameraView.disableView();
    }
    @Override
    protected void onResume(){
        super.onResume();
        if (OpenCVLoader.initDebug()){
            Log.i(TAG,"TRUE");
            mLoaderCallBack.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }else {
            Log.i(TAG,"FALSE");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_4_0,this,mLoaderCallBack);
        }
    }
    @Override
    public void onCameraViewStarted(int width, int height) {
        mRgba = new Mat(height,width, CvType.CV_8UC4);
        imgGray = new Mat(height,width, CvType.CV_8UC1);
    }
    @Override
    public void onCameraViewStopped() {
        mRgba.release();
    }
    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();
        input = inputFrame.gray();
        Imgproc.cvtColor(mRgba,imgGray,Imgproc.COLOR_RGB2GRAY);
        return mRgba;
    }
}

展示

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