使用simpleAdapter与图像列表视图 [英] Using simpleAdapter with image for listview
问题描述
我有一个小问题，把图像利用简单的适配器列表视图。我是从我的网络服务器（AMAZON）获取图像。基于用户ID下载图像后，我尝试设置他们在我的列表视图但是什么也没有显示，也没有错误发生。
下面是我的code：
//遍历所有申请
的for（int i = 0; I＆LT; applicant.length（）;我++）{
JSONObject的C = applicant.getJSONObject（我）;
//保存在变量中的每个JSON项目
字符串的uid = c.getString（TAG_UID）;
字符串名称= c.getString（TAG_NAME）;
字符串整体= c.getString（TAG_OVERALL）;
字符串apply_datetime = c.getString（TAG_APPLY_DATETIME）;
字符串的照片= c.getString（TAG_PHOTO）;
//创建新的HashMap
// HashMap的＆LT;字符串，字符串＆GT;图=新的HashMap＆LT;字符串，字符串＆GT;（）;
//图像
HashMap的＆LT;字符串，对象＆gt;图=新的HashMap＆LT;字符串，对象＆gt;（）;
//添加每个子节点HashMap的键（值）
map.put（TAG_UID，UID）;
map.put（TAG_NAME，姓名）;
map.put（TAG_OVERALL，整体）;
map.put（TAG_APPLY_DATETIME，apply_datetime）;
//添加HashList到ArrayList中
// applicantsList.add（图）
//挂牌，形象TO LISTVIEW
尝试 {
IMAGEURL = c.getString（TAG_PHOTO）;
InputStream的是=（InputStream的）新的URL（
我的URL链接/图片/
+ IMAGEURL）.getContent（）;
D = Drawable.createFromStream（是，SRC名）;
}赶上（例外五）{
e.printStackTrace（）;
}
map.put（TAG_PHOTO，D）;
//添加HashList到ArrayList中
applicantsList.add（图）
}
正如你所看到的，我下载后的图像。我使用下面simpleAdapter设置为列表视图：
SimpleAdapter适配器=新SimpleAdapter（
SignUpApplicantActivity.this，applicantsList，
R.layout.list_applicant，新的String [] {
TAG_UID，TAG_NAME，TAG_OVERALL，
TAG_APPLY_DATETIME，TAG_PHOTO}，新的INT [] {
R.id.applicantUid，R.id.applicantName，
R.id.applicantOverall，
R.id.apply_datetime，R.id.list_image}）;
//更新的ListView
setListAdapter（适配器）;
从 SimpleAdapter文档图像数据预计将资源ID或字符串（图像URI） - 见<一href="http://developer.android.com/reference/android/widget/SimpleAdapter.html#setViewImage%28android.widget.ImageView,%20java.lang.String%29"相对=nofollow> setViewImage（ImageView的，字符串）
我看到两个解决方案：
- 在地图数据提供一个URI，而不是绘制。
-
实现自己的观点粘合剂可绘绑定到ImageView的：
adapter.setViewBinder（新SimpleAdapter.ViewBinder（）{ @覆盖 公共布尔setViewValue（查看视图，对象数据，字符串textRe presentation）{ 如果（view.getId（）== R.id.list_image）{ ImageView的ImageView的=（ImageView的）观点; 可绘制绘制=（抽出式）的数据; imageView.setImageDrawable（绘制）; 返回true; } 返回false; } }）;
I have a little problem with putting an image to a list view using simple adapter. I'm getting the image from my online server(AMAZON). After downloading the image based on the user id, i try to set them in my listview but nothing was display and no error is occured.
Below is my code:
// looping through All applicants
for (int i = 0; i < applicant.length(); i++) {
JSONObject c = applicant.getJSONObject(i);
// Storing each JSON item in variable
String uid = c.getString(TAG_UID);
String name = c.getString(TAG_NAME);
String overall = c.getString(TAG_OVERALL);
String apply_datetime = c.getString(TAG_APPLY_DATETIME);
String photo = c.getString(TAG_PHOTO);
// creating new HashMap
//HashMap<String, String> map = new HashMap<String, String>();
//IMAGE
HashMap<String, Object> map = new HashMap<String, Object>();
// adding each child node to HashMap key (value)
map.put(TAG_UID, uid);
map.put(TAG_NAME, name);
map.put(TAG_OVERALL, overall);
map.put(TAG_APPLY_DATETIME, apply_datetime);
// adding HashList to ArrayList
// applicantsList.add(map);
// LISTING IMAGE TO LISTVIEW
try {
imageURL = c.getString(TAG_PHOTO);
InputStream is = (InputStream) new URL(
"my url link/images/"
+ imageURL).getContent();
d = Drawable.createFromStream(is, "src name");
} catch (Exception e) {
e.printStackTrace();
}
map.put(TAG_PHOTO, d);
// adding HashList to ArrayList
applicantsList.add(map);
}
As you can see, after i download the image. i set to listview using simpleAdapter below:
SimpleAdapter adapter = new SimpleAdapter(
SignUpApplicantActivity.this, applicantsList,
R.layout.list_applicant, new String[] {
TAG_UID, TAG_NAME, TAG_OVERALL,
TAG_APPLY_DATETIME, TAG_PHOTO }, new int[] {
R.id.applicantUid, R.id.applicantName,
R.id.applicantOverall,
R.id.apply_datetime, R.id.list_image });
// updating listView
setListAdapter(adapter);
From the SimpleAdapter documentation the image data is expected to be a resource ID or a string (an image URI) - see setViewImage(ImageView,String)
I see 2 solutions:
- Provide a URI in the data map, not a drawable.
Implement your own view binder to bind the drawable to the ImageView:
adapter.setViewBinder(new SimpleAdapter.ViewBinder() { @Override public boolean setViewValue(View view, Object data, String textRepresentation) { if(view.getId() == R.id.list_image) { ImageView imageView = (ImageView) view; Drawable drawable = (Drawable) data; imageView.setImageDrawable(drawable); return true; } return false; } });
这篇关于使用simpleAdapter与图像列表视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
