Get position of center child in RecyclerView Y Axes - Android User Interface

Android examples for User Interface:RecyclerView

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Description

Get position of center child in RecyclerView Y Axes

Demo Code


import android.support.v7.widget.RecyclerView;
import android.view.View;

public class Main{
    /**/*from  ww  w.  jav a  2  s. c om*/
     * Get position of center child in Y Axes
     */
    public static int getCenterYChildPosition(RecyclerView recyclerView) {
        int childCount = recyclerView.getChildCount();
        if (childCount > 0) {
            for (int i = 0; i < childCount; i++) {
                View child = recyclerView.getChildAt(i);
                if (isChildInCenterY(recyclerView, child)) {
                    return recyclerView.getChildAdapterPosition(child);
                }
            }
        }
        return childCount;
    }
    public static boolean isChildInCenterY(RecyclerView recyclerView,
            View view) {
        int childCount = recyclerView.getChildCount();
        int[] lvLocationOnScreen = new int[2];
        int[] vLocationOnScreen = new int[2];
        recyclerView.getLocationOnScreen(lvLocationOnScreen);
        int middleY = lvLocationOnScreen[1] + recyclerView.getHeight() / 2;
        if (childCount > 0) {
            view.getLocationOnScreen(vLocationOnScreen);
            if (vLocationOnScreen[1] <= middleY
                    && vLocationOnScreen[1] + view.getHeight() >= middleY) {
                return true;
            }
        }
        return false;
    }
}

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