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Android ScrollView与ListView,GridView共存冲突解决方案

2015-02-02 10:01 543 查看

转载自:http://www.2cto.com/kf/201210/159540.html

ListView或者GridView嵌套在ScrollView中：嵌套使用时，会出现ListView/GridView有自己的滚动条，而ScrollView又有自己的滚动条。解决此问题的核心是：重写ListView/GridView的OnMesure方法。

MyGridView.java代码如下：

package com.csdn.blog.scrollview;

import android.content.Context;

import android.util.AttributeSet;

import android.widget.GridView;

public class MyGridView extends GridView{

    public MyGridView(Context context, AttributeSet attrs, intdefStyle) {

        super(context, attrs,defStyle);

    }

    public MyGridView(Context context, AttributeSet attrs){

        super(context, attrs);

    }

    public MyGridView(Context context) {

        super(context);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, intheightMeasureSpec) {

        int expandSpec =MeasureSpec.makeMeasureSpec(

               Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);

        super.onMeasure(widthMeasureSpec,expandSpec);

    }

}

main.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical"

    android:background="#FFFFFF">

    <ScrollView

       android:layout_height="fill_parent"

       android:layout_width="fill_parent"

        android:fadingEdgeLength="0dp"

       android:scrollbars="none"

       android:id="@+id/scroll">

        <LinearLayout

           android:layout_height="fill_parent"

           android:layout_width="fill_parent"

           android:orientation="vertical">

           <ImageView

               android:id="@+id/image"

               android:layout_height="150dp"

               android:layout_width="fill_parent"

               android:padding="2dp"

               android:scaleType="centerCrop"

               android:src="@drawable/fruit" />

           <com.csdn.blog.scrollview.MyGridView

               android:layout_marginTop="10dp"

               android:id="@+id/grid"

               android:layout_height="fill_parent"

               android:layout_width="fill_parent"

               android:fadingEdgeLength="0dp"

               android:scrollbars="none"

               android:numColumns="3" />

        </LinearLayout>

    </ScrollView>

</LinearLayout>

主类主要就是GridVIew数据绑定。简单贴下代码：

package com.csdn.blog.scrollview;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ArrayAdapter;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.ScrollView;

import android.widget.LinearLayout.LayoutParams;

import android.widget.TextView;

public class BlogScrollViewActivity extends Activity {

    /** Called when the activity is first created. */

    MyGridView grid;

    ImageView image;

    ScrollView scroll;

    String[] texts=new String[]{"无线","通话设置","声音","显示","位置","应用","账户","隐私权","存储","语言","游戏","娱乐","电影","音乐","辅助功能","日期"};

    ArrayAdapter<String> adapter;

    LinearLayout.LayoutParams lp;

    @Override

    public void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        init();

    }

    void init(){

       image=(ImageView)findViewById(R.id.image);

       grid=(MyGridView)findViewById(R.id.grid);

        grid.setAdapter(newGridAdapter(this));

       scroll=(ScrollView)findViewById(R.id.scroll);

        scroll.requestChildFocus(image,null);

    }

    private class GridAdapter extends BaseAdapter{

        Activity context;

        public GridAdapter(Activitycontext){

           this.context=context;

        }

        @Override

        public int getCount() {

            returntexts.length;

        }

        @Override

        public Object getItem(int position){

            returnnull;

        }

        @Override

        public long getItemId(int position){

            return 0;

        }

        @Override

     public View getView(int position, View convertView,ViewGroup parent) {

            ViewHolderholder=null;

           if(convertView==null){

    convertView=context.getLayoutInflater().inflate(R.layout.item,null);

               holder=new ViewHolder();

     holder.image=(ImageView)convertView.findViewById(R.id.grid_image);

     holder.text=(TextView)convertView.findViewById(R.id.grid_text);

               convertView.setTag(holder);

            }

            else{

               holder=(ViewHolder)convertView.getTag();

            }

           holder.image.setImageResource(R.drawable.meinv);

            holder.text.setText(texts[position]);

            returnconvertView;

        }

        class ViewHolder {

            ImageViewimage;

            TextViewtext;

        }

    }

}

上述代码中 scroll.requestChildFocus(image, null);
此句主要是修复了程序进入时GridView会滑动到顶端的小bug。

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标签： android listview gridview android 解决方案

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