I am trying to open the Android camera using Opencv. I referred to some posts such as: http://stackoverflow.com/questions/17165777/open-the-android-native-camera-using-opencv and http://docs.opencv.org/2.4/doc/tutorials/introduction/android_binary_package/dev_with_OCV_on_Android.html#dev-with-ocv-on-android and as some of these posts suggested, I created the below posted layout with "org.opencv.android.CameraBridgeViewBase" item as shown below in the layout section.
At run time, if the following line was active the App crashs and logCat says: "java.lang.InstantiationException: Can't instantiate abstract class org.opencv.android.CameraBridgeViewBase" setContentView(R.layout.activity_main);
When I comment that line out as shown in the code in onCreate() method and run the code, logCat displays the following message:
Log.d(TAG, "onCameraFrame");
which means the Camera is previewing, but actually there is nothing displayed on the screen, the screen is black.
please let me know why "setContentView(R.layout.activity_main);" causes the App to crash and how to preview the camera display correctly
layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.bakri.opencvcamera_00.MainActivity">
<org.opencv.android.CameraBridgeViewBase
android:id="@+id/cameraBridgeViewBase_surfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:visibility="gone"
opencv:show_fps="true" opencv:camera_id="any" />
</RelativeLayout>
code:
@Override public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2,View.OnTouchListener { private final String TAG = MainActivity.class.getSimpleName(); private CameraBridgeViewBase mOpenCvCameraView;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
Log.i(TAG, "OpenCV loaded successfully");
mOpenCvCameraView.setOnTouchListener(MainActivity.this);
mOpenCvCameraView.enableView();
break;
default:
super.onManagerConnected(status);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
mOpenCvCameraView = (CameraBridgeViewBase) new JavaCameraView(this, 1);
//mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.cameraBridgeViewBase_surfaceView);
mOpenCvCameraView.setCameraIndex(CameraBridgeViewBase.CAMERA_ID_FRONT);
setContentView(mOpenCvCameraView);
mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
protected 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);
}
}
@Override
public void onCameraViewStarted(int width, int height) {
Log.d(TAG, "onCameraViewStarted");
}
@Override
public void onCameraViewStopped() {
Log.d(TAG, "onCameraViewStopped");
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
Log.d(TAG, "onCameraFrame");
return null;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.d(TAG, "onTouch");
return false;
}
}
