Android listview viewpager解决冲突 滑动

Android listview viewpager滑动 跳动 冲突解决 

 

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 当作header 

如:

 

 

 

当触发 滑动事件 的时候容易引发 滑动冲突    (好比斜着滑动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

 

查阅了不少的帖子  发现修改起来都很是麻烦 

 

(1)解决方案

1. 针对viewpager 作了些修改  

替换掉support.v4当中的viewpager便可:

 

 

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 若是为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:

 

<?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

以下:

 

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

 

 

/**
 * 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:

 

 

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);
    }
}