ListView多条目加载-优快云博客

本文链接：https://blog.youkuaiyun.com/Liuxb_zao/article/details/77880782

本文介绍了一个使用Android ListView的示例应用，通过自定义BaseAdapter实现了不同类型的视图展示，并展示了如何根据不同条件选择性地加载两种不同的布局。

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//布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" tools:context="com.example.mylistview.MainActivity">

  <ListView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:id="@+id/lv"
      ></ListView>

</android.support.constraint.ConstraintLayout>

//布局文件2

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/name"
        android:text="商品1"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/goods"

        />
</LinearLayout>

//布局文件3

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/name2"
        android:text="商品2"
        />
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/img"
        android:background="@mipmap/ic_launcher"
        />
</LinearLayout>

//MainActivity

package com.example.mylistview;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    private ListView lv;
    List<String> list=new ArrayList<String>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv =(ListView)findViewById(R.id.lv);
        indata();
        lv.setAdapter(new mydata());


    }

    private void indata() {

        for (int i=0;i<50;i++){
            list.add(i+"");
        }
    }
    class mydata extends BaseAdapter{

        final int textview1=0;
        final int textview2=1;
        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int i) {
            return list.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            ViewHolder vh;
            int type = getItemViewType(i);
            if(view==null){
                vh=new ViewHolder();
               switch (type){
                   case 0:
                       view=View.inflate(MainActivity.this,R.layout.textview1,null);
                       vh.name=view.findViewById(R.id.name);
                       vh.goods=view.findViewById(R.id.goods);
                       break;
                   case 1:
                       view=View.inflate(MainActivity.this,R.layout.texteview2,null);
                       vh.name2=view.findViewById(R.id.name2);
                       vh.img=view.findViewById(R.id.img);
                       break;
                   default:break;
               }
                  view.setTag(vh);
            }else{
                vh=(ViewHolder)view.getTag();
            }
            switch (type){
                case textview1:
                    vh.name.setText("商品1"+list.get(i).toString());
                    vh.goods.setText("香蕉"+list.get(i).toString());
                    break;
                case textview2:
                    vh.name2.setText("商品2"+list.get(i).toString());
                    vh.img.setBackgroundResource(R.mipmap.ic_launcher);
                    break;
            }
            return view;
        }

        @Override
        public int getViewTypeCount() {
            return 2;

        }

        @Override
        public int getItemViewType(int position) {
           int p=position%6;
            if(p==0){
                return textview1;
            }else if(p<3){
                return textview2;
            }else{
                return textview1;
            }
        }

        class ViewHolder{
            TextView name,name2,goods;
            ImageView img;
        }
    }

}