Comment réparer java.lang.ClassCastException Android

Question

J'ai cherché pour ce cas, je l'ai trouvé mais en C#. Oke, j'essaye de montrer mes données dans la listview en utilisant ListFragment android, json et mysql, mais j'ai eu une erreur de classe quand je l'ai lancé, j'espère que n'importe qui peut m'aider. Voici mon erreur:

06-12 17:04:04.685 20975-20975/com.spp.udi.sppmap E/AndroidRuntime: FATAL EXCEPTION: main 
                    Process: com.spp.udi.sppmap, PID: 20975 
                    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.spp.udi.sppmap/com.spp.udi.sppmap.Potensi}: java.lang.ClassCastException: com.spp.udi.sppmap.Potensi cannot be cast to android.app.Activity 
                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2345) 
                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) 
                     at android.app.ActivityThread.access$900(ActivityThread.java:153) 
                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347) 
                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                     at android.os.Looper.loop(Looper.java:148) 
                     at android.app.ActivityThread.main(ActivityThread.java:5451) 
                     at java.lang.reflect.Method.invoke(Native Method) 
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
                    Caused by: java.lang.ClassCastException: com.spp.udi.sppmap.Potensi cannot be cast to android.app.Activity 
                     at android.app.Instrumentation.newActivity(Instrumentation.java:1068) 
                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2335) 
                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)  
                     at android.app.ActivityThread.access$900(ActivityThread.java:153)  
                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347)  
                     at android.os.Handler.dispatchMessage(Handler.java:102)  
                     at android.os.Looper.loop(Looper.java:148)  
                     at android.app.ActivityThread.main(ActivityThread.java:5451)  
                     at java.lang.reflect.Method.invoke(Native Method)  
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  

Mon Potensi.java:

package com.spp.udi.sppmap; 

import android.app.Fragment; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ListView; 
import android.app.ListFragment; 
import java.util.ArrayList; 
import java.util.HashMap; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import android.util.Log; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ListAdapter; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 

public class Potensi extends ListFragment { 
    private static final String ID_KECAMATAN = "id_kecamatan"; 
    private static final String NAMA_KECAMATAN = "nama_kecamatan"; 
    ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String,String>>(); 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     JSONObject json = JSONFunction.getJSONFromUrl("http://192.168.43.203/project/s9/udi/android/potensi.php"); 
     try { 
      JSONArray laporan = json.getJSONArray("result"); 
      for(int i=0; i<laporan.length(); i++){ 
       JSONObject jsonobj = laporan.getJSONObject(i); 
       String id_kecamatan = jsonobj.getString(ID_KECAMATAN); 
       String nama_kecamatan = jsonobj.getString(NAMA_KECAMATAN); 
       HashMap<String, String> map = new HashMap<String, String>(); 
       map.put("id_kecamatan", id_kecamatan); 
       map.put("nama_kecamatan", nama_kecamatan); 
       mylist.add(map); 
      } 
     } catch (JSONException e) { 
      Log.e("log_tag","error parsing data "+e.toString()); 
     } 
     this.adapter_listview(); 
    } 

    public void adapter_listview() { 
     ListAdapter adapter = new SimpleAdapter(getActivity(), mylist, R.layout.potensi, 
       new String[] {ID_KECAMATAN, NAMA_KECAMATAN}, new int[] {R.id.id_kecamatan, R.id.nama_kecamatan}); 

     setListAdapter(adapter); 
     ListView lv = getListView(); 
     lv.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> parent, View view,int position, long id) { 
       String id_kecamatan = ((TextView) view.findViewById(R.id.id_kecamatan)).getText().toString(); 
       Intent in = new Intent(getActivity(), DetailPotensi.class); 
       in.putExtra(ID_KECAMATAN, id_kecamatan); 
       startActivity(in); 
      } 
     }); 
    } 
} 

Ma JSON:

{"result":[{"id_kecamatan":"8","nama_kecamatan":"Batang Dua"},{"id_kecamatan":"7","nama_kecamatan":"Pulau Moti"},{"id_kecamatan":"6","nama_kecamatan":"Pulau Hiri"},{"id_kecamatan":"5","nama_kecamatan":"Pulau Ternate"},{"id_kecamatan":"4","nama_kecamatan":"Ternate Utara"},{"id_kecamatan":"3","nama_kecamatan":"Ternate Tengah"},{"id_kecamatan":"2","nama_kecamatan":"Ternate Selatan"}]} 

Answer 1

ClassCastException

Thrown pour indiquer que le code a tenté de transformer un objet en sous-classe dont il n'est pas une instance.

Caused by: java.lang.ClassCastException: com.spp.udi.sppmap.Potensi cannot be cast to android.app.Activity 

Vous utilisez Listview android inbuild@ + id/android: liste

Alors, S'il vous plaît étend ListActivity au lieu de ListFragment.

public class Potensi extends ListActivity{