Question

怎么解决 ListView+ViewPager滑动事件冲突

Answer 1

ListView中嵌套ViewPage有或者滑动手势冲突解决

在listview 上使用 addHeaderView 在第一栏添加 viewpager 当做header
如:

当触发 滑动事件 的时候容易引起 滑动冲突 (比如斜着滑动viewpager 的时候 listview会跳动)
特别是在 下拉刷新或者上拉加载 的时候 , 组件可能会传递到viewpager当中

查阅了很多的帖子 发现修改起来都非常麻烦

(1)解决方案
1. 针对viewpager 做了些修改
替换掉support.v4当中的viewpager即可:

[java] view plain copy
package com.example.bz_viewpager;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewGroup;

/**
* viewpage 和listview 相互冲突 将父view 传递到viewpage 里面
*
* 使用父类的方法 parent.requestDisallowInterceptTouchEvent(true);
*
* 当 requestDisallowInterceptTouchEvent 如果为true的时候 表示:父view 不拦截子view的touch 事件
*
* 这个方法只是改变flag
*
* @author baozi
*
*/
public class DecoratorViewPager extends ViewPager {
private ViewGroup parent;

public DecoratorViewPager(Context context) {
super(context);
// TODO Auto-generated constructor stub
}

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

public void setNestedpParent(ViewGroup parent) {
this.parent = parent;
}

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
return super.dispatchTouchEvent(ev);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent arg0) {
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
return super.onInterceptTouchEvent(arg0);
}

@Override
public boolean onTouchEvent(MotionEvent arg0) {
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
return super.onTouchEvent(arg0);
}

}

2 . 在xml里面:

[html] view plain copy
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#f1f1f1" >

<com.example.bz_viewpager.DecoratorViewPager
android:id="@+id/vp"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fadingEdge="none" />

</RelativeLayout>

3. 在代码里使用

将 viewpager 的父view传递到viewpager里面
调用: vp.setNestedpParent((ViewGroup)vp.getParent()); 方法
如下:

[java] view plain copy
lv = (ListView) findViewById(R.id.lv);

View header = LayoutInflater.from(MainActivity.this).inflate(R.layout.viewpage_layout, null);
DecoratorViewPager vp = (DecoratorViewPager) header.findViewById(R.id.vp);
vp.setNestedpParent((ViewGroup)vp.getParent());

MyPagapter myPagapter = new MyPagapter(MainActivity.this);
vp.setAdapter(myPagapter);
lv.addHeaderView(header);

(2)解析:
viewgroup 当中有 一个 requestDisallowInterceptTouchEvent方法
这个方法只改变flag 当 view.requestDisallowInterceptTouchEvent 参数为true的时候
view 不会拦截其子控件的 触摸事件

[java] view plain copy
/**
* Called when a child does not want this parent and its ancestors to
* intercept touch events with
* {@link ViewGroup#onInterceptTouchEvent(MotionEvent)}.
*
* <p>This parent should pass this call onto its parents. This parent must obey
* this request for the duration of the touch (that is, only clear the flag
* after this parent has received an up or a cancel.</p>
*
* @param disallowIntercept True if the child does not want the parent to
* intercept touch events.
*/
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept);

贴上源码:

[java] view plain copy
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {

if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) {
// We're already in this state, assume our ancestors are too
return;
}

if (disallowIntercept) {
mGroupFlags |= FLAG_DISALLOW_INTERCEPT;
} else {
mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT;
}

// Pass it up to our parent
if (mParent != null) {
mParent.requestDisallowInterceptTouchEvent(disallowIntercept);
}
}

Answer 2

滑动冲突，一行代码即可解决，在listview的onTouch中增加：
getParent().requestDisallowInterceptTouchEvent(true);
意思就是告诉父容器，不要处理Touch事件。