在bottom-android检查滚动视图

Question

请，如果用户滚动底部的滚动视图，我想为用户显示弹出窗口，我如何检查底部的滚动视图？ 有没有办法检查？

Answer 1

在你的情况下：ScrollView，请检查http://developer.android.com/reference/android/widget/ScrollView.html#onOverScrolled%28int,%20int,%20boolean,%20boolean%29 - Klotor

实现一个 OnScrollListener，设置你​​的 ListView 的 onScrollListener，然后你应该能够正确处理事情了。

例如：

private int preLast;

// 初始化的东西。 yourListView.setOnScrollListener(this);

// ... ... ...

@Override
public void onScroll(AbsListView lw, final int firstVisibleItem,
                 final int visibleItemCount, final int totalItemCount) {
    switch(lw.getId()) {
        case android.R.id.list:     

            // Make your calculation stuff here. You have all your
            // needed info from the parameters of this function.

            // Sample calculation to determine if the last 
            // item is fully visible.
           final int lastItem = firstVisibleItem + visibleItemCount;
           if(lastItem == totalItemCount) {
              if (preLast != lastItem){ //to avoid multiple calls for last item
                Log.d("Last", "Last");
                preLast = lastItem;
                //show your popup code
              }
           }
    }
}

Answer 2

试试这样的：

@Override
 protected void onScrollChanged(int l, int t, int oldl, int oldt) {
    View view = (View) getChildAt(getChildCount()-1);
    int diff = (view.getBottom()-(getHeight()+getScrollY()+view.getTop()));// Calculate the scrolldiff
    if( diff == 0 ){  // if diff is zero, then the bottom has been reached
        Log.d(ScrollTest.LOG_TAG, "MyScrollView: Bottom has been reached" );
    }
    super.onScrollChanged(l, t, oldl, oldt);
}

感谢Harry Joylink