ViewTarget.java

package uk.co.deanwild.materialshowcaseview.target;

import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Point;
import android.graphics.Rect;
import android.view.View;


public class ViewTarget implements Target {

    private final View mView;

    public ViewTarget(View view) {
        mView = view;
    }

    public ViewTarget(int viewId, Activity activity) {
        mView = activity.findViewById(viewId);
    }

    @Override
    public Point getPoint() {
        int[] location = new int[2];
        mView.getLocationInWindow(location);
        View decor = getActivity(mView).getWindow().getDecorView();
        int x = location[0] - decor.getPaddingLeft() + mView.getWidth() / 2;
        int y = location[1] - decor.getPaddingTop() + mView.getHeight() / 2;
        return new Point(x, y);
    }

    private Activity getActivity(View view) {
        Context context = view.getContext();
        while (context instanceof ContextWrapper) {
            if (context instanceof Activity) {
                return (Activity)context;
            }
            context = ((ContextWrapper)context).getBaseContext();
        }
        return null;
    }

    @Override
    public Rect getBounds() {
        int[] location = new int[2];
        mView.getLocationInWindow(location);
        return new Rect(
                location[0],
                location[1],
                location[0] + mView.getMeasuredWidth(),
                location[1] + mView.getMeasuredHeight()
        );
    }
}