对着老师的写的：

<?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"

    android:orientation="horizontal">

    <ImageView

        android:id="@+id/info_img"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginLeft="3dp"

        android:src="@drawable/ic_launcher"

        />

    <TextView 

        android:id="@+id/text"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_toRightOf="@id/info_img"

        android:layout_marginTop="5dp"

        />

</LinearLayout>

package com.example.imooclistview;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

private ListView lv;

private SimpleAdapter sim_adapter;

private ArrayList<Map<String,Object>> dataList;

@Override

protected void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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

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

sim_adapter=new SimpleAdapter(this, getData(), R.layout.info, new String[]{"img","text"}, new int[]{R.id.info_img,R.id.text});

lv.setAdapter(sim_adapter);

}

private ArrayList<Map<String,Object>> getData(){

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

{

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

item.put("img",R.drawable.ic_launcher);

item.put("text", "慕课网"+i);

dataList.add(item);

}

return dataList;

}

}

但是运行的时候"慕课网8"以后的不能滚到屏幕中来是为什么: