我的申请有问题。我正在尝试在 android 的自定义类中从我的数据库中传递 json 数据，然后将其显示在列表中。当我运行我的应用程序时，没有任何反应，没有错误，没有显示列表。如果有人可以帮助我将非常感激！:)
所有网络的东西都是异步完成的，我试图返回一个对象数组，所以我怀疑这可能是问题在这里，或者当我将字符串从 httphandler 类转换为 JSONArray 时。
这是我的主要活动
package com.example.test1;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.net.ParseException;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class clubpage extends Activity {
class Programme {
public String name;
public String event;
public String price;
}
String clubphp = "http://10.0.2.2/corkgaa/Nemo.php";
String progString;
ArrayList<Programme> Programmedata = new ArrayList<Programme>();
ListView clublistview = (ListView)findViewById(R.id.listview1);
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.clubpage);
new Dbhandler().execute(clubphp);
ArrayAdapter<Programme> adapter = new ArrayAdapter<Programme>(this,
android.R.layout.simple_list_item_1, Programmedata);
clublistview.setAdapter(adapter);
}
public class Dbhandler extends AsyncTask<String, Void, ArrayList<Programme>> {
protected ArrayList<Programme> doInBackground(String... arg0) {
ArrayList<Programme> arraydata = new ArrayList<Programme>();
progString = httphandler.HttpGetExec(clubphp);
try{
JSONArray jArray = new JSONArray(progString);
JSONObject json_data=null;
for(int i=0;i<jArray.length();i++){
json_data = jArray.getJSONObject(i);
Programme Progresult = new Programme();
Progresult.name = json_data.getString("Name");
Progresult.event = json_data.getString("Event");
Progresult.price = json_data.getString("Price");
arraydata.add(Progresult);
}
}
catch(JSONException e1){
}
catch (ParseException e1) {
e1.printStackTrace();
}
return arraydata;
}
@Override
protected void onPostExecute(ArrayList<Programme> result) {
Programmedata = result;
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
}
httphandler 类在这里：
package com.example.test1;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.util.Log;
public class httphandler {
//Main Dev setup
public static String HttpGetExec (String URI) {
// TODO Auto-generated method stub
String result = "no response";
InputStream is = null;
StringBuilder sb = null;
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/corkgaa/Nemo.php");
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}
catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line="0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}
catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
return result;
//aa=new ArrayAdapter<String>(clubpage.this, R.layout.listrow, R.id.title, result);
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.listrow, R.id.title, result);
//listview.setAdapter(aa);
}
}