这是我的源代码；listview 没有显示“状态”。其余数据可见'我不知道问题出在哪里。请帮助我，我试图解决这个问题已经有一段时间了。它是发送电子邮件和接收电子邮件的应用程序，这是邮箱源代码。在邮箱中应该显示状态、发件人、专家、主题、价格。
public class MailBox extends ListActivity {
String userName;
ListView MailList;
//////contact JSonArray
JSONArray contacts = null;
String x;
private static final String Status="a";
String StatusVal="";
private static final String From="b";
String FromVal;
private static final String Expert="c";
String ExpertVal;
private static final String Subject="d";
private static final String Price="e";
String SubjectVal;
// JSON Node names
private static final String TAG_CONTACTS = "list";
private static final String TAG_ID = "mail_ID";
private static final String TAG_STATUS = "mail_status";
private static final String TAG_FROM_ID= "fromID";
private static final String TAG_TO_ID= "toID";
private static final String TAG_QUESTION= "questionid";
private static final String TAG_PRICE= "mail_price";
String xVal="";
String arr[];
Handler handler;
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
ProgressDialog progressDialog;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mail_box);
MailList=(ListView) findViewById(R.id.list);
final Bundle b=getIntent().getExtras();
if(b!=null)
{
userName=b.getString("userName");
}
handler = new Handler();
starttask();
}
public void starttask()
{
progressDialog = ProgressDialog.show(this,"" , "Logging In");
Thread thread = new Thread() {
public void run () {
String url = "http://onlinesolutionproviders.com/apiosp.php?student_inbox=1&client_login_id="+userName;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(url);
HttpClient httpClient = new DefaultHttpClient();
HttpContext httpContext= new BasicHttpContext();
try {
contacts = json.getJSONArray(TAG_CONTACTS);
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_STATUS);
String fromid = c.getString(TAG_FROM_ID);
String toid = c.getString(TAG_TO_ID);
String subject = c.getString(TAG_QUESTION);
String price = c.getString(TAG_PRICE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_ID, id);
map.put(TAG_STATUS, name);//status
map.put(TAG_FROM_ID, fromid);//from id
map.put(TAG_TO_ID, toid);//expert name
map.put(TAG_QUESTION, subject);//subject
map.put(TAG_PRICE, price);//price
String URL="http://onlinesolutionproviders.com/apiosp.php?client_email_subject=1&client_login_id="+userName+"&to_id="
+toid+"&from_id="+fromid+"&questionid="+id+"&status="+name;
// Check your log cat for JSON reponse
Log.d("url mail box",URL);
HttpGet httpGet = new HttpGet(URL);
try
{
HttpResponse response = httpClient.execute(httpGet, httpContext);
HttpEntity hte=response.getEntity();
InputStream is= hte.getContent();
BufferedReader br=new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb= new StringBuilder();
String line=null;
while ((line=br.readLine()) != null)
{
sb.append(line + "");
}
is.close();
x= String.valueOf(Html.fromHtml(sb.toString()));
Scanner scan= new Scanner(x);
arr= new String[5];
int j=0;
while(scan.hasNextLine())
{
arr[j]=scan.nextLine();
j++;
}
map.put(Status, arr[0]);
map.put(From, arr[1]);
map.put(Expert, arr[2]);
map.put(Subject, arr[3]);
map.put(Price, arr[4]);
}
catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "OOps! Something went wrong. Restart the Application" , Toast.LENGTH_LONG).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "OOps! Something went wrong. Restart the Application" , Toast.LENGTH_LONG).show();
}
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
handler.post(new Runnable() {
public void run() {
updateUI();
progressDialog.dismiss();
}
});
}
};
thread.start();
}
private void updateUI () {
SpecialAdapter adapter = new SpecialAdapter(MailBox.this, contactList,
R.layout.list_item_mailbox,
new String[] { TAG_ID, Status, From, Expert, Subject, Price, TAG_FROM_ID,TAG_TO_ID,TAG_QUESTION, TAG_STATUS }, new int[] {
R.id.eID ,R.id.status_heading, R.id.expert_heading,R.id.eexpert_heading, R.id.subject_heading, R.id.price_heading,
R.id.fromid, R.id.toid,R.id.question,R.id.statusid});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
/* for(int a = 0; a < parent.getChildCount(); a++)
{
parent.getChildAt(a).setBackgroundColor(Color.BLACK);
}
view.setBackgroundColor(Color.RED);*/
String mailid = ((TextView) view.findViewById(R.id.eID)).getText().toString();
String fromid = ((TextView) view.findViewById(R.id.fromid)).getText().toString();
String toid = ((TextView) view.findViewById(R.id.toid)).getText().toString();
String question = ((TextView) view.findViewById(R.id.question)).getText().toString();
String status = ((TextView) view.findViewById(R.id.status_heading)).getText().toString();
String pricetosend = ((TextView) view.findViewById(R.id.price_heading)).getText().toString();
Intent in = new Intent(getApplicationContext(), MailBoxDetail.class);
in.putExtra("mailid", mailid);
in.putExtra("fromid", fromid);
in.putExtra("toid", toid);
in.putExtra("question", question);
in.putExtra("userName", userName);
in.putExtra("status", status);
in.putExtra("pricetosend", pricetosend);
startActivity(in);
}
});
}
这是 specialAdapter 的代码
package com.OSP.client;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;
public class SpecialAdapter extends SimpleAdapter {
private int[] colors = new int[] { Color.parseColor("#FFFFFF"), Color.parseColor("#D8D8D8") };
public SpecialAdapter(Context context, List<HashMap<String, String>> items, int resource, String[] from, int[] to) {
super(context, items, resource, from, to);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
int colorPos = position % colors.length;
view.setBackgroundColor(colors[colorPos]);
return view;
}
}