我非常需要我们的帮助。
我需要创建一个 expandableListView 并放入更多加载到 url 的图像。
现在我有这个：
我将文本保存到 xml 文件中，但我不知道如何在图像中显示我的图像动态。
这是代码：
Main.java
public class Main extends ExpandableListActivity {
static final String KEY_DISCOUNTED_PRICE = "discounted_price";
static final String KEY_PRICE = "price";
static final String KEY_DISCOUNT = "discount";
static final String KEY_THUMB_URL_SELLER = "seller_image_url";
static final String KEY_THUMB_URL = "image_url";
static final String KEY_DESCRIPTION = "description";
static final String KEY_TITLE_OFFERTA = "title_offerta";
String contenuto_nodo;
ArrayList <String> array_contenuto_nodo =new ArrayList<String>();
ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
static final String shades[][] = {
// Shades of grey
{
"lightgrey","#D3D3D3",
"dimgray","#696969",
"sgi gray 92","#EAEAEA"
},
// Shades of blue
{
"dodgerblue 2","#1C86EE",
"steelblue 2","#5CACEE",
"powderblue","#B0E0E6"
},
// Shades of yellow
{
"yellow 1","#FFFF00",
"gold 1","#FFD700",
"darkgoldenrod 1"," #FFB90F"
},
// Shades of red
{
"indianred 1","#FF6A6A",
"firebrick 1","#FF3030",
"maroon","#800000"
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
TaskHomePageLista task = new TaskHomePageLista();
task.execute();
try {Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// ImageLoader class instance
SimpleExpandableListAdapter expListAdapter =
new SimpleExpandableListAdapter(
this,
createGroupList(), // groupData describes the first-level entries
R.layout.list_row, // Layout for the first-level entries
new String[] { KEY_PRICE, KEY_DISCOUNT, KEY_DESCRIPTION, KEY_DISCOUNTED_PRICE, KEY_TITLE_OFFERTA}, // Key in the groupData maps to display
new int[] { R.id.price, R.id.discount, R.id.description, R.id.discounted_price, R.id.title_offerta}, // Data under "colorName" key goes into this TextView
createChildList(), // childData describes second-level entries
R.layout.child_row, // Layout for second-level entries
new String[] { "shadeName", "rgb" }, // Keys in childData maps to display
new int[] { R.id.childname, R.id.rgb }
);
setListAdapter( expListAdapter );
// Imageview to show
}
/**
* Creates the group list out of the colors[] array according to
* the structure required by SimpleExpandableListAdapter. The resulting
* List contains Maps. Each Map contains one entry with key "colorName" and
* value of an entry in the colors[] array.
*/
private List createGroupList() {
return (List)songsList;
}
/**
* Creates the child list out of the shades[] array according to the
* structure required by SimpleExpandableListAdapter. The resulting List
* contains one list for each group. Each such second-level group contains
* Maps. Each such Map contains two keys: "shadeName" is the name of the
* shade and "rgb" is the RGB value for the shade.
*/
private List createChildList() {
ArrayList result = new ArrayList();
for( int i = 0 ; i < shades.length ; ++i ) {
// Second-level lists
ArrayList secList = new ArrayList();
for( int n = 0 ; n < shades[i].length ; n += 2 ) {
HashMap child = new HashMap();
child.put( "shadeName", shades[i][n] );
child.put( "rgb", shades[i][n+1] );
secList.add( child );
}
result.add( secList );
}
return result;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class TaskHomePageLista extends AsyncTask<String, Void, Void> {
protected void onPreExecute(Void... params) {
}
protected Void doInBackground(String... args) {
try {
// passo i parametri di mail e password alle variabili
//setto la pagina
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost("http://www.miosito.HomePageXml.aspx");
// aggiungo alla lista le variabili
// chiamo la pagina che mi da una risposta.
HttpResponse response = httpClient.execute(httpPost, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance()
.newDocumentBuilder();
Document doc = builder.parse(in);
String[] nomi = new String[6];
nomi[0] = "price";
nomi[1] = "image_url";
nomi[2] = "seller_image_url";
nomi[3] = "discount";
nomi[4] = "discounted_price";
nomi[5] = "description";
if (doc != null) {
// dichiaro n3 per la lunghezza dell'item principale di quello che devo selezionare.
NodeList n3 = doc.getElementsByTagName("promo");
NodeList n2 = doc.getElementsByTagName("home");
for (int i = 0; i < n3.getLength(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
for( int num=0; num < nomi.length; num++){
n2 = doc.getElementsByTagName(nomi[num]);
if (n2.getLength() > 0) {
Node node = n2.item(i);
contenuto_nodo = node.getTextContent();
array_contenuto_nodo.add(contenuto_nodo+"///");
if(nomi[num].equals("price")){
map.put(KEY_PRICE, "Valore" + Html.fromHtml("<BR>" + node.getTextContent() + " €"));
}
if(nomi[num].equals("image_url")){
map.put(KEY_THUMB_URL, node.getTextContent());
}
// if(nomi[num].equals("seller_image_url")){
// map.put(KEY_THUMB_URL_SELLER, node.getTextContent());
// }
if(nomi[num].equals("discount")){
map.put(KEY_DISCOUNT, "Sconto" + Html.fromHtml("<BR>" + node.getTextContent() + " %"));
}
if(nomi[num].equals("discounted_price")){
map.put(KEY_DISCOUNTED_PRICE, node.getTextContent()+ " €");
}
if(nomi[num].equals("description")){
map.put(KEY_DESCRIPTION, node.getTextContent());
}
System.out.println("sto elaborando");
}
n2 = doc.getElementsByTagName("home");
}
n2 = doc.getElementsByTagName("promo");
if (n2.getLength() > 0) {
Node node = n2.item(i);
node = node.getFirstChild();
map.put(KEY_TITLE_OFFERTA, node.getTextContent());
}
songsList.add(map);
}
System.out.println("array_titolo_categoria_home is: " + array_contenuto_nodo );
// controllo_login_tempo = "finito";
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Void... params) {
}
}
}
在 AsynkTask 之后的 KEY_THUMB_URL 中，我有图像的 url。我需要使用图像加载器进行展示。但我不知道如何在 SimpleExpandableListAdapter 中实现图像加载器。请帮帮我很重要！
我想我可以使用这个：
int loader = R.drawable.loader;
// Imageview to show
ImageView image = (ImageView) findViewById(R.id.image);
// Image url
String image_url = "http://api.androidhive.info/images/sample.jpg";
// ImageLoader class instance
ImageLoader imgLoader = new ImageLoader(getApplicationContext());
// whenever you want to load an image from url
// call DisplayImage function
// url - image url to load
// loader - loader image, will be displayed before getting image
// image - ImageView
imgLoader.DisplayImage(image_url, loader, image);
但我不知道我必须把这段代码放在哪里......请帮忙！
