I'm trying to load and display an image in Android Studio using OpenCV but it's crash. I don't find where is the problem... Appreciate any helps! Thanks!
public class MainActivity2 extends Activity {
private static final String TAG = "Kate : ";
BaseLoaderCallback mOpenCVCallBack;
Mat mRgba;
ImageView imge1;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
}
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS: {
Log.i(TAG, "OpenCV loaded successfully");
mRgba=new Mat();
load_AND_display();
}
break;
default: {
super.onManagerConnected(status);
}
break;
}
}
};
public void load_AND_display() {
//getting ImageView
imge1= (ImageView) findViewById(R.id.img1);
try {
//Loading Image to Mat object
mRgba= Utils.loadResource(this,R.drawable.mako,Highgui.CV_LOAD_IMAGE_COLOR);
} catch (IOException e) {
e.printStackTrace();
}
// create a bitmap:
Bitmap bm = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(),Bitmap.Config.ARGB_8888);
// convert Mat image to bitmap::
Utils.matToBitmap(mRgba, bm);
//setting the image
imge1.setImageBitmap(bm);
}
@Override
public void onResume() {
super.onResume();
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
/*OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_6, this, mLoaderCallback);*/
}
this is the Logcat:
05-05 15:54:20.323 29948-29948/com.example.myapplication E/art﹕ No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)
05-05 15:54:20.323 29948-29948/com.example.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.myapplication, PID: 29948
java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)
Use the following steps:
private val mLoaderCallback: BaseLoaderCallback = object : BaseLoaderCallback(this) {
override fun onManagerConnected(status: Int) {
when (status) {
SUCCESS -> {
Log.e("OpenCV", "OpenCV loaded successfully")
}
else -> {
super.onManagerConnected(status)
}
}
}
}
onResume()
of the main activity, check weather OpenCv has been loaded or not:override fun onResume() {
super.onResume()
if (!OpenCVLoader.initDebug()) {
Log.d(
"OpenCV",
"Internal OpenCV library not found. Using OpenCV Manager for initialization"
)
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback)
} else {
Log.d("OpenCV", "OpenCV library found inside package. Using it!")
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS)
}
}
opencv
operations or initialization Mat--call this:.....
setContentView(R.layout.activity_main)
OpenCVLoader.initDebug()
.....
val matObject = Mat()
Utils.bitmapToMat(mBitmap, matObject)
Here mBitmap
is the bitmap of the image we want to use and Utils.bitmapToMat()
is an in-built function of org.opencv.android*
In your code, load the drawable as bitmap and then convert to mat.
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