/**
* Created by Administrator on 2016/11/22.
*/
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ScrollView;
/**
* 可以監(jiān)聽ScrollView的上下滑動(dòng) 句灌，實(shí)現(xiàn)ScrollListener接口账胧，調(diào)用setScrollListener(ScrollListener l)方法悟耘。
* SCROLL_UP :ScrollView正在向上滑動(dòng)
* SCROLL_DOWN :ScrollView正在向下滑動(dòng)
* @author yxw
*/
public class ObservableScrollView extends ScrollView {
private ScrollListener mListener;
public static interface ScrollListener {
public void scrollOritention(int oritention);
}
/**
* ScrollView正在向上滑動(dòng)
*/
public static final int SCROLL_UP = 0x01;
/**
* ScrollView正在向下滑動(dòng)
*/
public static final int SCROLL_DOWN = 0x10;
/**
* 最小的滑動(dòng)距離
*/
private static final int SCROLLLIMIT = 40;
public ObservableScrollView(Context context) {
super(context, null);
}
public ObservableScrollView(Context context, AttributeSet attrs) {
super(context, attrs, 0);
}
public ObservableScrollView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (oldt > t && oldt - t > SCROLLLIMIT) {// 向下
if (mListener != null)
mListener.scrollOritention(SCROLL_DOWN);
} else if (oldt < t && t - oldt > SCROLLLIMIT) {// 向上
if (mListener != null)
mListener.scrollOritention(SCROLL_UP);
}
}
public void setScrollListener(ScrollListener l) {
this.mListener = l;
}
}
調(diào)用監(jiān)聽事件：
scrollView.setScrollListener(new ObservableScrollView.ScrollListener() {
@Override
public void scrollOritention(int oritention) {
if(oritention==0x01) {
//ScrollView正在向上滑動(dòng)
Log.i(TAG,"ScrollView正在向上滑動(dòng)");
}else if(oritention==0x10) {
// ScrollView正在向下滑動(dòng)
Log.i(TAG,"ScrollView正在向下滑動(dòng)");
}
}
});