ListView嵌套GridView使用详解及注意事项

Posted 2022-12-12 志向远大

1.listview万能适配器

package com.tts.hotelmanager.adapter;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import com.tts.hotelmanager.bean.ViewHoldItem;

/**
 * ListView适配器
 * 
 * @param <T>
 */
public class Adapter<T> extends BaseAdapter 

    public List<T> list;
    private Context context;
    private int layout;

    public Adapter(Context context, int layout) 
        this.context = context;
        this.layout = layout;
        list = new ArrayList<T>();
    

    public void setData(List<T> list) 
        this.list = list;
        notifyDataSetChanged();
    

    public void setClear() 
        list.clear();
        notifyDataSetChanged();
    

    public void remove(T t) 
        if (list.size() > 0 && list.contains(t)) 
            list.remove(t);
        
        notifyDataSetChanged();
    

    public void removeInt(int i) 
        if (list.size() > 0 && i < list.size()) 
            list.remove(i);
        
        notifyDataSetChanged();
    

    public void setDataChar(T t) 
        list.add(t);
        this.notifyDataSetChanged();
    

    @Override
    public int getCount() 
        return list.size();
    

    @Override
    public T getItem(int position) 
        return (T)list.get(position);
    

    @Override
    public long getItemId(int position) 
        return position;
    

    public List<T> getList() 
        return list;
    

    @Override
    public View getView(int position, View view, ViewGroup arg2) 
        ViewHoldItem vh = ViewHoldItem.get(context, position, view, layout,
                arg2);
        face.adapter(vh, list.get(position));
        return vh.getViewHoldIitem();
    

    public void setInterface(Interface1<T> face) 
        this.face = face;
    

    private Interface1<T> face;

    public interface Interface1<T> 
        public void adapter(ViewHoldItem viewHolder, T t);
    

2.MainActivity的代码

    // 设置adapter的item
        mAdapter = new Adapter<HashMap<String, String>>(this,
                R.layout.item_comment_content);
        mAdapter.setInterface(this); // 实现接口
        // 给adapter设置数据以及绑定到listview上面
                mAdapter.setData(mCommentsDetailList);
                mListView.setAdapter(mAdapter);

3.因为由于ListView和GridView都是可滑动的控件，所以需要自定义GridView,重写其onMeasure()方法。在该方法中使GridView的高为wrap_content的大小,否则GridView中 的内容只能显示很小一部分。item中GridView的布局代码

  <com.tts.hotelmanager.adapter.NoScrollGridView
        android:id="@+id/item_comment_content_gridview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/dp_20"
        android:horizontalSpacing="10dp"
        android:numColumns="5"
        android:scrollbars="vertical"
        android:verticalSpacing="10dp"
        android:visibility="visible" />

4.自定义不可滑动的GridView

package com.tts.hotelmanager.adapter;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;

public class NoScrollGridView extends GridView 
    public NoScrollGridView(Context context) 
        super(context);

    

    public NoScrollGridView(Context context, AttributeSet attrs) 
        super(context, attrs);
    

    /**
     * 重写这个方法
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    

５.在重写adapter的方法里面，获取服务器返回的图片路径，然后转换为String[]数组，然后遍历把每个图片uri对象存在arrayListForEveryGridView 里面，然后把数组放在GridViewAdapter 里面，通过GridViewAdapter 映射到gridView控件上面。

    // 显示评论提交的图片
        String imageAddress = hm.get("imageAddress");
        hashMap = new HashMap<String, Object>();
        arrayListForEveryGridView = new ArrayList<HashMap<String, Object>>();
        if (!imageAddress.equals("")) 
            String[] imageArray = imageAddress.split(",");
            for (int i = 0; i < imageArray.length; i++) 
                String uri = ConstantsMember.SHOW_PICTURE_URL + imageArray[i];
                hashMap.put("image" + i, uri);
                arrayListForEveryGridView.add(hashMap);
            
            // 把数据放在adapter里面，通过adapter映射到gridView控件上面
            GridViewAdapter gridViewAdapter = new GridViewAdapter(
                    CheckCommentActivity.this, arrayListForEveryGridView);
            gridView.setAdapter(gridViewAdapter);
        

6.

package com.tts.hotelmanager.adapter;

import java.util.ArrayList;
import java.util.HashMap;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.tts.hotelmanager.R;

public class GridViewAdapter extends BaseAdapter 
    private Context mContext;
    private ArrayList<HashMap<String, Object>> mList;

    public GridViewAdapter(Context mContext,
            ArrayList<HashMap<String, Object>> mList) 
        super();
        this.mContext = mContext;
        this.mList = mList;
    

    @Override
    public int getCount() 
        if (mList == null) 
            return 0;
         else 
            return this.mList.size();
        
    

    @Override
    public Object getItem(int position) 
        if (mList == null) 
            return null;
         else 
            return this.mList.get(position);
        
    

    @Override
    public long getItemId(int position) 
        return position;
    

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) 
        ViewHolder holder = null;
        if (convertView == null) 
            holder = new ViewHolder();
            convertView = LayoutInflater.from(this.mContext).inflate(
                    R.layout.item_check_comment_image, null, false);
            holder.image = (ImageView) convertView
                    .findViewById(R.id.item_image);
            convertView.setTag(holder);

         else 
            holder = (ViewHolder) convertView.getTag();
        
        // 判断arrayListForEveryGridView是否为空
        if (this.mList != null) 
            HashMap<String, Object> hashMap = this.mList.get(position);
            // 判断获取的路径是否为空
            if (holder.image != null) 
                String uri = hashMap.get("image" + position).toString();
                if (uri != null) 
            // 用Glide显示图片，可以自己到网上下载jar包 Glide.with(mContext).load(uri).centerCrop()
                    .crossFade().into(holder.image);
                
            
        
        return convertView;
    

    private class ViewHolder 
        ImageView image;