ScrollView嵌套ListView分页加载
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ScrollView嵌套ListView分页加载数据
在ListView的onMeasure重写之后,通常所用的setOnScrollListener失去作用,无法监听ListView的滚动事件。
本例通过监听ScrollView滚动到底部,来实现分页加载。
package net.xxx.widget;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.widget.ScrollView;/** * Created by max on 2016/10/26. */public class MyScrollView extends ScrollView { private static final String TAG = MyScrollView.class.getSimpleName(); public MyScrollView(Context context) { super(context); } public MyScrollView(Context context, AttributeSet attrs) { super(context, attrs); } public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt);// Log.d(TAG, "onScrollChanged: 竖直高度t = " + t);// Log.d(TAG, "onScrollChanged: 竖直高度oldt = " + oldt); //将高度传出去 if (mOnScrollHeightListener != null) { mOnScrollHeightListener.onScrollHeight(t); } }//滚动到底部时,clampedY变为true,其余情况为false,通过回调将状态传出去即可。 @Override protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) { super.onOverScrolled(scrollX, scrollY, clampedX, clampedY); if (scrollY != 0 && null != mOnScrollToBottomListener) { mOnScrollToBottomListener.onScrollBottomListener(clampedY); } } private OnScrollToBottomListener mOnScrollToBottomListener; public void setOnScrollToBottomLintener(OnScrollToBottomListener listener) { mOnScrollToBottomListener = listener; } public interface OnScrollToBottomListener { public void onScrollBottomListener(boolean isBottom); }//复杂实现方式,将滚动距离传出去,获取滚动的位置,来判断也可。 public interface OnScrollHeightListener { void onScrollHeight(int scrollY); } private OnScrollHeightListener mOnScrollHeightListener; public void setOnScrollHeightListener(OnScrollHeightListener onScrollHeightListener) { mOnScrollHeightListener = onScrollHeightListener; } // public void}
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