我用一些字段制作了一个非常简单的表单，因为我已经为国家列表放了一个ListView，我从webservice获取所有国家名称，我得到了所有数据，但是我无法在ListView中设置它，我的ListView不可见，请帮帮我。谢谢你，我的代码如下：
RegistrationActivity.java
package com.epe.yehki.ui;
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.epe.yehki.adapter.CountryAdapter;
import com.epe.yehki.adapter.ProductAdapter;
import com.epe.yehki.backend.BackendAPIService;
import com.epe.yehki.backend.RegisterationAPI;
import com.epe.yehki.backend.ResponseListener;
import com.epe.yehki.uc.Menu;
import com.epe.yehki.util.Const;
import com.epe.yehki.util.Const.API_RESULT;
import com.example.yehki.R;
public class RegistrationActivity extends Activity {
public RegisterationAPI registartionAPI;
private EditText fName;
private EditText lName;
private EditText eMail;
private Button register;
private CountryAdapter countryContent;
private EditText contact;
private EditText password;
private ListView countrylist;
private ListView statelist;
public static ArrayList<String> countryArray;
private TextView country;
private TextView state;
JSONArray countries = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> countryList;
ArrayList<HashMap<String, String>> stateList;
public com.epe.yehki.uc.Menu regMenu;
private ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_registration);
// FINDING IDS...
fName = (EditText) findViewById(R.id.et_fname);
lName = (EditText) findViewById(R.id.et_lname);
eMail = (EditText) findViewById(R.id.et_email);
contact = (EditText) findViewById(R.id.et_contact);
password = (EditText) findViewById(R.id.et_pwd);
country = (TextView) findViewById(R.id.et_country);
state = (TextView) findViewById(R.id.et_state);
regMenu = (Menu) findViewById(R.id.menuReg);
register = (Button) findViewById(R.id.btn_register);
countryList = new ArrayList<HashMap<String, String>>();
countrylist = (ListView) findViewById(R.id.country_list);
statelist = (ListView) findViewById(R.id.state_list);
countryArray = new ArrayList<String>();
regMenu.setSelectedTab(1);
// COUNTRY LIST CLICK EVENT...!!!
countrylist.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// getting values from selected ListItem
String countryname = ((TextView) view.findViewById(R.id.name)).getText().toString();
country.setText(countryname);
// countrylist.setVisibility(view.GONE);
}
});
// REGISTER BUTTOM CLICK EVENT.....!
register.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if (!fName.getText().toString().equals("") && fName.getText().toString() != null) {
if ((!lName.getText().toString().equals("") && lName.getText().toString() != null)) {
if ((!country.getText().toString().equals("") && country.getText().toString() != null)) {
if ((!state.getText().toString().equals("") && state.getText().toString() != null)) {
if ((!eMail.getText().toString().equals("") && eMail.getText().toString() != null)) {
if ((!password.getText().toString().equals("") && password.getText().toString() != null)) {
if ((!contact.getText().toString().equals("") && contact.getText().toString() != null)) {
} else {// CONTACT NUMBER
validation(getResources().getString(R.string.valid_number));
password.requestFocus();
}
} else {// password...
validation(getResources().getString(R.string.valid_pwd));
password.requestFocus();
}
} else {// EMAIL
validation(getResources().getString(R.string.valid_mail));
eMail.requestFocus();
}
} else {// STATE
validation(getResources().getString(R.string.valid_state));
state.requestFocus();
}
} else {// COUNTRY
validation(getResources().getString(R.string.valid_country));
country.requestFocus();
}
} else {// LAST NAME
validation(getResources().getString(R.string.valid_lname));
lName.requestFocus();
}
} else {// FIRST NAME
validation(getResources().getString(R.string.valid_fname));
fName.requestFocus();
}
}
});
// COUINTRY LIST CLICK EVENT...!!!!
country.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
countrylist.setVisibility(View.VISIBLE);
new GetCountries().execute();
}
});
}
void validation(String msg) {
Toast.makeText(RegistrationActivity.this, msg, Toast.LENGTH_SHORT).show();
}
ResponseListener responseListener = new ResponseListener() {
@Override
public void onResponce(String api, API_RESULT result, Object obj) {
System.out.println("::::::::::::::inside response Listener::::::::");
if (progressDialog != null && progressDialog.isShowing())
progressDialog.dismiss();
if (api.equals(Const.API_LOGIN)) {
System.out.println("::::::::::::::inside response Listener::::::::1");
if (result == Const.API_RESULT.SUCCESS) {
registartionAPI = null;
// as
// doctor
System.out.println("success Login::::::::::>>>>>>>>>>>>>>>>>>" + result);
startActivity(new Intent(RegistrationActivity.this, HomeActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
} else {
System.out.println("failed Login::::::::::>>>>>>>>>>>>>>>>>>" + result);
}
}
}
};
// ASYNC TASK FOR GETTING COUNTRY LIST...!!!
private class GetCountries extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
/*
* pDialog = new ProgressDialog(CategoryActivity.this);
* pDialog.setMessage("Please wait...");
* pDialog.setCancelable(false); pDialog.show();
*/
System.out.println("==========inside preexecute===================");
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
BackendAPIService sh = new BackendAPIService();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(Const.API_COUTRY, BackendAPIService.GET);
Log.d("Response: ", "> " + jsonStr);
System.out.println("=============MY RESPONSE========== FOR COUNTRYlIST" + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
if (jsonObj.has(Const.TAG_COUNTY_LIST)) {
// looping through All Contacts
countries = jsonObj.getJSONArray(Const.TAG_COUNTY_LIST);
for (int i = 0; i < countries.length(); i++) {
JSONObject c = countries.getJSONObject(i);
String cId = c.getString(Const.TAG_COUNTRY_ID);
String countryName = c.getString(Const.TAG_COUNTRY_NAME);
System.out.println("::::::::::::CountryId:::::::::::::" + countryName);
HashMap<String, String> country = new HashMap<String, String>();
country.put(Const.TAG_COUNTRY_ID, cId);
country.put(Const.TAG_COUNTRY_NAME, countryName);
countryList.add(country);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
countryContent = new CountryAdapter(RegistrationActivity.this, countryList);
countrylist.setAdapter(countryContent);
}
}
}
CountryAdapter.java
package com.epe.yehki.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.epe.yehki.util.Const;
import com.example.yehki.R;
public class CountryAdapter extends BaseAdapter {
public ArrayList<HashMap<String, String>> countryArray;
private Context mContext;
public CountryAdapter(Context paramContext, ArrayList<HashMap<String, String>> cuntryList) {
this.mContext = paramContext;
this.countryArray = cuntryList;
}
public int getCount() {
return this.countryArray.size();
}
public Object getItem(int paramInt) {
return Integer.valueOf(paramInt);
}
public long getItemId(int paramInt) {
return paramInt;
}
@SuppressWarnings("static-access")
public View getView(int paramInt, View paramView, ViewGroup paramViewGroup) {
LayoutInflater localLayoutInflater = (LayoutInflater) this.mContext.getSystemService("layout_inflater");
Viewholder localViewholder = null;
if (paramView == null) {
paramView = localLayoutInflater.inflate(R.layout.list_item, paramViewGroup, false);
localViewholder = new Viewholder();
localViewholder.countryid = ((TextView) paramView.findViewById(R.id.cat_id));
localViewholder.countryName = ((TextView) paramView.findViewById(R.id.name));
paramView.setTag(localViewholder);
} else {
localViewholder = new Viewholder();
localViewholder = (Viewholder) paramView.getTag();
}
System.out.println("::::::::::::::array indexes::::::::::::" + countryArray.get(paramInt));
localViewholder.countryName.setText(countryArray.get(paramInt).get(Const.TAG_COUNTRY_NAME));
localViewholder.countryid.setText(countryArray.get(paramInt).get(Const.TAG_COUNTRY_ID));
return paramView;
}
static class Viewholder {
TextView countryName;
TextView countryid;
}
}
答案 0 :(得分：0)
它没有显示任何内容，因为您没有填满要显示的数据集。您可以在onCreate中创建适配器，但在数据集为空时。 Imo你应该从
更改Adapter构造函数public CountryAdapter(Context paramContext, ArrayList<String> paramArrayList) {
到
public CountryAdapter(Context paramContext, ArrayList<HashMap<String, String>> paramArrayList) {
当调用onPostExecuted时，您创建一个新的CountryAdapter并将其提交给ListView。当然，您必须调整适配器以反映适配器构造函数的更改