Example usage for android.widget AdapterView getLastVisiblePosition

Introduction

In this page you can find the example usage for android.widget AdapterView getLastVisiblePosition.

Prototype

public int getLastVisiblePosition() 

Source Link

Document

Returns the position within the adapter's data set for the last item displayed on screen.

Usage

From source file:com.recyclerviewpulldownrefresh.view.refresh.AbPullToRefreshView.java

/**
 * ??/* w w w  . j  av  a2  s.c om*/
 *
 * @return
 */
public boolean canChildScrollDown() {
    if (!mEnableLoadMore) {
        return false;
    }
    if (mTarget instanceof AdapterView<?>) {
        AdapterView<?> absListView = (AdapterView<?>) mTarget;
        View lastChild = absListView.getChildAt(absListView.getChildCount() - 1);
        if (lastChild == null) {
            return true;
        }
        // ??viewBottom?ViewmAdapterView?view,
        // ViewmAdapterView??
        if (lastChild.getBottom() <= getHeight()
                && absListView.getLastVisiblePosition() == absListView.getCount() - 1) {
            return true;
        }
    } else if (mTarget instanceof WebView) {
        WebView webview = (WebView) mTarget;
        return webview.getContentHeight() * webview.getScale() <= webview.getHeight() + webview.getScrollY();
    } else if (mTarget instanceof ScrollView) {
        ScrollView scrollView = (ScrollView) mTarget;
        View childView = scrollView.getChildAt(0);
        if (childView != null) {
            return childView.getMeasuredHeight() <= getHeight() + mScrollView.getScrollY();
        }
    } else if (mTarget instanceof RecyclerView) {
        int lastVisiblePosition = 0;
        View childView = null;

        RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

        if (layoutManager instanceof LinearLayoutManager) {
            lastVisiblePosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            childView = layoutManager.findViewByPosition(lastVisiblePosition);
        } else if (layoutManager instanceof GridLayoutManager) {
            lastVisiblePosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            childView = layoutManager.findViewByPosition(lastVisiblePosition);
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            int[] spanPosition = new int[((StaggeredGridLayoutManager) layoutManager).getSpanCount()];
            ((StaggeredGridLayoutManager) layoutManager).findLastVisibleItemPositions(spanPosition);
            lastVisiblePosition = getLastVisibleItemPosition(spanPosition);
            childView = getLastVisibleItemBottomView(layoutManager, spanPosition, lastVisiblePosition);
        }
        if (null == childView) {
            return false;
        }

        if (lastVisiblePosition == layoutManager.getItemCount() - 1 && childView.getBottom()
                + layoutManager.getBottomDecorationHeight(childView) <= mTarget.getBottom()) {
            return true;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, 1);
    }
    return false;
}

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