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you're not loading the opencv c++ native libs, so your code can't run. also, you can't run any opencv code from onCreate, since you have to wait, until the (async)loading finished. you need to add something similar to this:

private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    public void onManagerConnected(int status) {
        if (status == LoaderCallbackInterface.SUCCESS ) {
            // now we can call opencv code !
            run(....); // some args
        } else {

public void onResume() {;
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_1,this, mLoaderCallback);
    // you may be tempted, to do something here, but it's *async*, and may take some time,
    // so any opencv call here will lead to unresolved native errors.