can ViewGroup Child Scroll Up - Android User Interface

Android examples for User Interface:ViewGroup

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Description

can ViewGroup Child Scroll Up

Demo Code


//package com.java2s;

import android.os.Build;
import android.support.v4.view.ViewCompat;

import android.view.View;
import android.view.ViewGroup;

import android.widget.AbsListView;

public class Main {
    /**/*  w w  w  .j  a  v  a  2  s. c  o m*/
     * @return Whether it is possible for the child view of this layout to
     *         scroll up. Override this if the child view is a custom view.
     */
    public static boolean canChildScrollUp(ViewGroup viewGroup) {
        if (viewGroup != null) {
            View mTarget = viewGroup.getChildAt(0);
            if (mTarget != null) {
                if (Build.VERSION.SDK_INT < 14) {
                    if (mTarget instanceof AbsListView) {
                        final AbsListView absListView = (AbsListView) mTarget;
                        return absListView.getChildCount() > 0
                                && (absListView.getFirstVisiblePosition() > 0 || absListView
                                        .getChildAt(0).getTop() < absListView
                                        .getPaddingTop());
                    } else {
                        return ViewCompat.canScrollVertically(mTarget, -1)
                                || mTarget.getScrollY() > 0;
                    }
                } else {
                    return ViewCompat.canScrollVertically(mTarget, -1);
                }
            }
        }
        return false;
    }
}

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