scrollerview中使用viewpager嵌套fragmentment 滚动事件冲突解决

最新推荐文章于 2024-04-28 17:40:56 发布

转载最新推荐文章于 2024-04-28 17:40:56 发布 · 153 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/shenshilei/p/6839425.html

本文介绍了解决Android中嵌套使用ViewPager和ScrollView时事件冲突的方法。通过重写ViewPager和ScrollView，分别拦截横向和纵向滑动事件，确保了两个组件能够正确响应用户的触摸操作。

1、重写viewpager 对事件分发进行拦截，主要拦截横向滑动

/**
* 嵌套在scrollerview中时计算固定高度
* Created by shenshilei on 2017/5/10.
*/
public class ScViewPager extends ViewPager {
private float xDistance, yDistance, xLast, yLast;
public ScViewPager(Context context) {
super(context);
}

public ScViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}

/**
* 事件分发，判断是否是左右滑动并且右侧有没有子项
* @param ev
* @return
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xLast = ev.getX();
yLast = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY();

xDistance += Math.abs(curX - xLast);
yDistance += Math.abs(curY - yLast);
xLast = curX;
yLast = curY;

Log.e("Client",xDistance+"移动"+yDistance);

if (xDistance > yDistance &&(getCurrentItem()>0||getCurrentItem()<getChildCount()-1)) {
Log.e("Client","右侧还有");
return true;
}else if(yDistance>xDistance){
getParent().requestDisallowInterceptTouchEvent(false);
}
// else if (xDistance > yDistance &&(getCurrentItem()==getChildCount()-1)){
// Log.e("Client","右侧没有");
// return false;
// }else{
// getParent().requestDisallowInterceptTouchEvent(false);
// Log.e("Client","其他");
// return true;
// }

}

return super.onInterceptTouchEvent(ev);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int viewHeight = 0;
View childView = getChildAt(getCurrentItem());
if(childView != null){
childView.measure(widthMeasureSpec,
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
viewHeight = childView.getMeasuredHeight();
heightMeasureSpec = MeasureSpec.makeMeasureSpec(viewHeight,
MeasureSpec.EXACTLY );
}

super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

2、第二步重写scrollerview 主要是对纵向滑动事件进行拦截

/**
* 解决嵌套viewpager时事件冲突的问题
* Created by shenshilei on 2017/5/10.
*/
public class VpScrollView extends ScrollView {
private float xDistance, yDistance, xLast, yLast;

public VpScrollView(Context context) {
super(context);
}

public VpScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public VpScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
xDistance = yDistance = 0f;
xLast = ev.getX();
yLast = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float curX = ev.getX();
final float curY = ev.getY();

xDistance += Math.abs(curX - xLast);
yDistance += Math.abs(curY - yLast);
xLast = curX;
yLast = curY;
Log.e("Client", "scollerview ："+xDistance + "移动" + yDistance);
if (xDistance > yDistance) {
return false;
}
}

return super.onInterceptTouchEvent(ev);
}

@Override
protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
return 0;
}
}

转载于:https://www.cnblogs.com/shenshilei/p/6839425.html