使用simpleAdapter ANDROID列表视图中显示图像 [英] Display image in listview using simpleAdapter ANDROID
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问题描述
我目前正在上显示图像插入使用SimpleAdapter我的列表视图Android应用程序。我的形象是从我的在线服务器检索。之后，我检索图像，我试图显示图像但无任何显示没有错误了。
下面是我的code
类ListApplicant扩展的AsyncTask＆LT;字符串，字符串，字符串＆GT; { //开始之前，后台线程显示进度对话框
@覆盖
在preExecute保护无效（）{
super.on preExecute（）;
pDialog =新ProgressDialog（SignUpApplicantActivity.this）;
pDialog.setIndeterminate（假）;
pDialog.setCancelable（假）;
} //获取所有的报名网址
保护字符串doInBackground（字符串参数... args）{
//大厦参数
清单＆LT;＆的NameValuePair GT; PARAMS =新的ArrayList＆LT;＆的NameValuePair GT;（）;
params.add（新BasicNameValuePair（开斋节，EID））; // URL从获取JSON字符串
JSONObject的JSON = jParser.makeHtt prequest（url_list_applicant，
GET，则params）; //检查JSON响应您的日志猫
Log.d（所有申请人：json.toString（））; 尝试{
//检查成功TAG
INT成功= json.getInt（TAG_SUCCESS）; 如果（成功== 1）{
发现申请人//
//获取申请人的数组
申请人= json.getJSONArray（TAG_APPLICANTS）; //通过所有申请人循环
的for（int i = 0; I＆LT; applicant.length（）;我++）{
JSONObject的C = applicant.getJSONObject（I） //存储在变量中的每个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）; //创建新的HashMap
// HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;弦乐，
//字符串＆GT;（）; // IMAGE HASHMAP
HashMap的＆LT;字符串，字符串＆GT;地图=新的HashMap＆LT;字符串，字符串＆GT;（）; //将每个子节点的HashMap键（值）
map.put（TAG_UID，UID）;
map.put（TAG_NAME，名）;
map.put（TAG_OVERALL，整体）;
map.put（TAG_APPLY_DATETIME，apply_datetime）; //添加HashList到ArrayList的
// applicantsList.add（图） //挂牌，形象TO LISTVIEW
尝试{
IMAGEURL = c.getString（TAG_PHOTO）; InputStream为=（InputStream的新的网址
http://ec2-175-41-164-218.ap-southeast-1.compute.amazonaws.com/android/images/
+ IMAGEURL）.getContent（）;
D = Drawable.createFromStream（是，SRC名）;
}赶上（例外五）{
e.printStackTrace（）;
} map.put（TAG_PHOTO，d.toString（））; //添加HashList到ArrayList的
applicantsList.add（地图）;
}
}
}赶上（JSONException E）{
e.printStackTrace（）;
} 返回null;
} //后台完成任务后辞退进度对话框
保护无效onPostExecute（字符串FILE_URL）{
//让所有申请后关闭该对话框
pDialog.dismiss（）;
//从后台线程更新界面
runOnUiThread（新的Runnable（）{
公共无效的run（）{
如果（applicantsList.isEmpty（））{
applicantDisplay
.setText（无申请人已签署了没有？）;
}其他{ //更新解析的JSON数据到ListView控件 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）;
}
}
}）;
}
}
解决方案
该问题是在这里：
map.put（TAG_PHOTO，d.toString（））;
您设置键为一个字符串如可绘制@为0x12345678，然后将其绑定到 R.id.list_image 我以为是一个ImageView的。这是行不通的。
我没有用一个可绘制很喜欢，但我曾与一个位图的成功：
位图位= BitmapFactory.de codeStream（是）;
然后我推翻 bindView 我的适配器设置图像：
公共无效bindView（查看视图，上下文的背景下，光标光标）{
//做默认的东西
super.bindView（查看，背景，光标）; //现在设置图像
ImageView的imgView =（ImageView的）view.findViewById（R.id.imageView1）;
imgView.setImageBitmap（位图）;
}
A SimpleAdapter 不具有 bindView 方法，这样反而可以提供 ViewBinder ：
mySimpleAdapter.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（）。等于（R.id.my_img_view_id））{
（（ImageView的）视图）.setImageBitmap（位图）; //我们已成功绑定这个观点
返回true;
}其他{
//允许默认绑定发生
返回false;
}
}
}）;
I am currently working on an android application displaying image into my listview using SimpleAdapter. My image is retrieved from my online server. After i retrieve the image, i tried to display the image but nothing was displayed and no error too.
Below is my code
class ListApplicant extends AsyncTask<String, String, String> {
// Before starting background thread Show Progress Dialog
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(SignUpApplicantActivity.this);
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
}
// getting All applicants from URL
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("eid", eid));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_list_applicant,
"GET", params);
// Check your log cat for JSON response
Log.d("All applicants: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// applicants found
// Getting Array of applicants
applicant = json.getJSONArray(TAG_APPLICANTS);
// 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);
// creating new HashMap
// HashMap<String, String> map = new HashMap<String,
// String>();
// IMAGE HASHMAP
HashMap<String, String> map = new HashMap<String, String>();
// 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(
"http://ec2-175-41-164-218.ap-southeast-1.compute.amazonaws.com/android/images/"
+ imageURL).getContent();
d = Drawable.createFromStream(is, "src name");
} catch (Exception e) {
e.printStackTrace();
}
map.put(TAG_PHOTO, d.toString());
// adding HashList to ArrayList
applicantsList.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
// After completing background task Dismiss the progress dialog
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all applicants
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
if (applicantsList.isEmpty()) {
applicantDisplay
.setText("No applicants have signed up yet");
} else {
//Updating parsed JSON data into ListView
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);
}
}
});
}
}
解决方案
The problem is here:
map.put(TAG_PHOTO, d.toString());
You set that key to a string like "Drawable@0x12345678" and then bind it to R.id.list_image which I assume is an ImageView. That won't work.
I haven't used a Drawable quite like that, but I have had success with a Bitmap:
Bitmap bitmap = BitmapFactory.decodeStream(is);
And then I overrode bindView on my Adapter to set the image:
public void bindView(View view, Context context, Cursor cursor) {
// do the default stuff
super.bindView(view, context, cursor);
// now set the image
ImageView imgView = (ImageView) view.findViewById(R.id.imageView1);
imgView.setImageBitmap(bitmap);
}
A SimpleAdapter doesn't have a bindView method, so instead you can provide a ViewBinder:
mySimpleAdapter.setViewBinder(new SimpleAdapter.ViewBinder() {
@Override
public boolean setViewValue(View view, Object data, String textRepresentation) {
if (view.getId().equals(R.id.my_img_view_id)) {
((ImageView) view).setImageBitmap(bitmap);
// we have successfully bound this view
return true;
} else {
// allow default binding to occur
return false;
}
}
});
这篇关于使用simpleAdapter ANDROID列表视图中显示图像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！
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