How to display Images in ListView android

问题

I have been looking around for examples on how to do this. Cam across an approach that used SimpleAdapter and HashMaps here on StackOverflow. This is my code. It's not working. All I can see is an empty row of a list.

listItems = new ArrayList<HashMap<String,Object>>();

HashMap<String,Object> listData1 = new HashMap<String,Object>();
HashMap<String,Object> listData2 = new HashMap<String,Object>();

image_1 = getResources().getDrawable(R.drawable.camera_icon_focus_dim);
image_2 = getResources().getDrawable(R.drawable.camera_icon_scene_mode);

listData1.put("icon focus", image_1);
listData2.put("icon_scene", image_2);

listItems.add(listData1);
listItems.add(listData2);

SimpleAdapter listItemAdapter = new SimpleAdapter(this, listItems,
  R.layout.image_list_item, new String[]{"icon_focus"}, 
  new int[]{R.id.list_view_item1});

optionsList.setAdapter(listItemAdapter);

image_list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<ImageView   xmlns:android="http://schemas.android.com/apk/res/android"
        android:paddingTop="12dip"       
        android:layout_width="wrap_content"       
        android:layout_height="wrap_content"        
        android:id="@+id/listitem_img"
    />

list_item.xml:

<?xml version="1.0" encoding="utf-8"?>
    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_view_item1"
android:layout_width="wrap_content"
android:layout_height="0dip"
android:layout_weight="1.0"
/>

Please tell me what I'm doing wrong.

回答1:

The field in your HashMap needs to match. Try this:

listItems = new ArrayList<HashMap<String,Integer>>();
String fieldName = "icon_id";

HashMap<String, Integer> listData1 = new HashMap<String, Integer>();
HashMap<String, Integer> listData2 = new HashMap<String, Integer>();

listData1.put(fieldName, R.drawable.camera_icon_focus_dim);
listData2.put(fieldName, R.drawable.camera_icon_scene_mode);

listItems.add(listData1);
listItems.add(listData2);

SimpleAdapter listItemAdapter = new SimpleAdapter(
    this,
    listItems,
    R.layout.image_list_item,
    new String[] { fieldName },
    new int[] { R.id.listitem_img });

来源：https://stackoverflow.com/questions/8411485/how-to-display-images-in-listview-android

标签

android

listview

imageview

hashmap

simpleadapter