问题描述
任何人都可以在这里帮助。我试图从填充JSON响应列表视图。响应被张贴,由于某种原因,它没有显示在列表中?任何帮助此外,它是停在列表视图,只是没有看到任何东西。
扩展ListActivity {
//进度对话框
私人ProgressDialog pDialog;
//创建JSON解析器对象
JSONParser jParser =新JSONParser();
ArrayList的< HashMap的<字符串,字符串>> ideasList;
// URL获得所有产品列表
私有静态字符串url_all_products =http://theideavault.no-ip.org//android_connect/get_all_products.php;
// JSON节点名称
私有静态最后弦乐TAG_SUCCESS =成功;
私有静态最后弦乐TAG_PRODUCTS =点子;
私有静态最后弦乐TAG_IID =IID;
私有静态最后弦乐TAG_NAME =理念;
//产品JSONArray
JSONArray想法= NULL;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.all_idea);
//哈希映射为的ListView
ideasList =新的ArrayList< HashMap的<字符串,字符串>>();
//加载产品在后台线程
新LoadAllProducts()执行();
//获取列表视图
ListView的LV = getListView();
//在选课单品
//启动编辑产品屏幕
lv.setOnItemClickListener(新OnItemClickListener(){
@覆盖
公共无效onItemClick(适配器视图<>母公司视图中查看,
INT位置,长的id){
//从选择列表项获得价值
字符串IID =((TextView中)view.findViewById(R.id.iid))。gettext的()
的ToString();
//开始的新意图
意图=新的意图(getApplicationContext()
EditIdeaActivity.class);
//发送PID到下一个活动
in.putExtra(TAG_IID,IID);
//开始新的活动,期待一些回响应
startActivityForResult(在,100);
}
});
}
//从编辑产品的活动响应
@覆盖
保护无效onActivityResult(INT申请code,INT结果code,意图数据){
super.onActivityResult(要求code,因此code,数据);
//如果结果是code 100
如果(结果code == 100){
//如果结果是code 100接收
//意味着用户编辑/删除产品
//重新载入该画面
意向意图= getIntent();
完();
startActivity(意向);
}
}
/ **
*背景异步任务,以通过HTTP请求负载的所有产品
* * /
类LoadAllProducts扩展的AsyncTask<字符串,字符串,字符串> {
/ **
*在启动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(AllIdeasActivity.this);
pDialog.setMessage(从数据库Reteiving思想Wooooooo ......。);
pDialog.setIndeterminate(假);
pDialog.setCancelable(假);
pDialog.show();
}
/ **
*得到所有产品的网址
* * /
保护字符串doInBackground(字符串参数... args){
//大厦参数
名单<的NameValuePair> PARAMS =新的ArrayList<的NameValuePair>();
//从URL获取JSON字符串
JSONObject的JSON = jParser.makeHtt prequest(url_all_products,GET,则params);
//检查你的日志猫JSON效应初探
Log.d(所有的想法:json.toString());
尝试 {
//检查成功TAG
INT成功= json.getInt(TAG_SUCCESS);
如果(成功== 1){
发现//产品
//获取产品阵列
创意= json.getJSONArray(TAG_PRODUCTS);
//遍历所有产品
的for(int i = 0; I< ideas.length();我++){
JSONObject的C = ideas.getJSONObject(我);
//保存在变量中的每个JSON项目
字符串IID = c.getString(TAG_IID);
字符串的想法= c.getString(TAG_NAME);
//创建新的HashMap
HashMap的<字符串,字符串>图=新的HashMap<字符串,字符串>();
//添加每个子节点HashMap中的key =>值
map.put(TAG_IID,IID);
map.put(TAG_NAME,想法);
//添加HashList到ArrayList中
ideasList.add(图)
}
} 其他 {
//没有发现产品
//启动添加新产品活动
意图I =新的意图(getApplicationContext()
NewIdeaActivity.class);
//关闭所有previous活动
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(ⅰ);
}
}赶上(JSONException E){
e.printStackTrace();
}
返回null;
}
/ **
*在完成后台任务之后关闭该进度对话框
* ** /
保护无效onPostExecute(字符串file_url){
让所有的产品之后//关闭该对话框
pDialog.dismiss();
//从后台线程更新UI
runOnUiThread(新的Runnable(){
公共无效的run(){
/ **
*更新解析JSON数据到ListView控件
* * /
ListAdapter适配器=新SimpleAdapter(
AllIdeasActivity.this,ideasList,
R.layout.list_idea,新的String [] {TAG_IID,
TAG_NAME},
新的INT [] {R.id.iid,R.id.idea});
//更新列表视图
setListAdapter(适配器);
}
});
}
}}
伟大的错误,你所做的是同时初始化TAG_PRODUCTS变量。
错误:
私有静态最后弦乐TAG_PRODUCTS =点子;
修正值:
私有静态最后弦乐TAG_PRODUCTS =产品;
顺便说一句,你取的想法或产品?因为你的反应是产品和你的code介绍点子:)
Can anyone help here. I'm trying to populate a listview from a json response. the response is posting, for some reason it isn't showing the list? anything helpsAlso it is stopping on the list view, just not seeing anything.
extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> ideasList;
// url to get all products list
private static String url_all_products = "http://theideavault.no-ip.org//android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "ideas";
private static final String TAG_IID = "iid";
private static final String TAG_NAME = "idea";
// products JSONArray
JSONArray ideas = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_idea);
// Hashmap for ListView
ideasList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String iid = ((TextView) view.findViewById(R.id.iid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditIdeaActivity.class);
// sending pid to next activity
in.putExtra(TAG_IID, iid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllIdeasActivity.this);
pDialog.setMessage("Reteiving Ideas from database. Wooooooo...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Ideas: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
ideas = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < ideas.length(); i++) {
JSONObject c = ideas.getJSONObject(i);
// Storing each json item in variable
String iid = c.getString(TAG_IID);
String idea = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_IID, iid);
map.put(TAG_NAME, idea);
// adding HashList to ArrayList
ideasList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewIdeaActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} 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 products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllIdeasActivity.this, ideasList,
R.layout.list_idea, new String[] { TAG_IID,
TAG_NAME},
new int[] { R.id.iid, R.id.idea });
// updating listview
setListAdapter(adapter);
}
});
}
}}
The great mistake you did is while initialize TAG_PRODUCTS variable.
Mistake:
private static final String TAG_PRODUCTS = "ideas";
Correct value:
private static final String TAG_PRODUCTS = "products";
BTW, are you fetching ideas or products? because your response is of products and your code describes Idea :)
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