ListView 里面有个 SimpleAdapter，SimpleAdapter 里面的 ImageView 怎么更改图片

谁学逆向工程 2016-10-02 08:41:02

for 循环添加了 20 行，每行都是一样的，这代码是照视频教程做的。但是他没说怎么更改图片和文字



<!-- main.xml -->

<LinearLayout

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical">

    <ListView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

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

</LinearLayout>



<!-- item.xml -->

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent">



    <ImageView

        android:layout_alignParentLeft="true"

        android:id="@+id/pic"

        android:layout_marginLeft="15dp"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@mipmap/ic_launcher"/>

    <TextView

        android:layout_toRightOf="@id/pic"

        android:id="@+id/text"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:textSize="20sp"

        android:textColor="#000000"

        android:text="demo"/>

    <ImageView

        android:layout_alignParentRight="true"

        android:id="@+id/pic2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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



</RelativeLayout>

package com.example.administrator.third;



import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.AbsListView;

import android.widget.Adapter;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;



import java.util.AbstractList;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Objects;



public class MainActivity extends Activity implements AdapterView.OnItemClickListener, AbsListView.OnScrollListener

{



    ListView listView;

    ArrayAdapter<String> arr_adapter;

    SimpleAdapter simp_adapter;

    List<Map<String, Object>> dataList;

    protected void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        listView = (ListView)findViewById(R.id.listView);

        String []arr_data = {"豆芽菜","大鲅鱼","大葱","咸鸭蛋" };



        dataList = new ArrayList<Map<String,Object>>();



        arr_adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arr_data);

        simp_adapter = new SimpleAdapter(

                this,

                getData(),

                R.layout.item,

                new String[]{"text","pic2", "pic"},

                new int []{R.id.text, R.id.pic2,  R.id.pic});



    //    listView.setAdapter(arr_adapter);

        listView.setAdapter(simp_adapter);

        listView.setOnItemClickListener(this);

        listView.setOnScrollListener(this);

    }



    List<Map<String, Object>> getData()

    {

        for(int i = 0; i<20; i++ )

        {

            Map<String,Object> map = new HashMap<>();

            map.put("text", "豆芽菜"+i);

            map.put("pic2",R.drawable.tiger  );

            map.put("pic", R.mipmap.ic_launcher);

            dataList.add(map);

        }

        return dataList;

    }





    public void onItemClick(AdapterView<?> parent, View view, int position, long id)

    {

        String text = listView.getItemAtPosition(position) + "";

        Toast.makeText(this, "position = " + position + " text= "+  text, Toast.LENGTH_SHORT ).show();

    }



    int i =500;



    public void onScrollStateChanged(AbsListView view, int scrollState)

    {

        switch (scrollState)

        {

            case SCROLL_STATE_FLING:

                i++;

                Log.i("4444","用户在手指离开屏幕之前，由于用力滑了一下，视图扔依靠惯性继续滑动");

                Map<String, Object> map = new HashMap<String,Object>();

                map.put("pic", R.mipmap.ic_launcher);

                map.put("text", "增加项"+i);

                dataList.add(map);

                simp_adapter.notifyDataSetChanged();//通知 UI 线程

                break;

            case SCROLL_STATE_IDLE:

                Log.i("4444", "视图已经停止滑动");

                break;

            case SCROLL_STATE_TOUCH_SCROLL:

                Log.i("4444", "手指没有离开屏幕，视图正在滑动");

                break;

        }

    }



    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)

    {}

}