AlertDialogのListViewが繰り返されます

Question

My AlertDialogにはListViewが含まれています。 AlertDialogが却下され、戻ってくるとListViewが2回表示されます。なぜこのようなことが起こるのか分かりません。ここに私のコードは次のとおりです。

protected Dialog onCreateDialog(int id) { 
     AlertDialog.Builder builder = new AlertDialog.Builder(LegendTest.this); 
     final LayoutInflater inflater = (LayoutInflater) Legend`enter code here`Test.this 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View view = inflater.inflate(R.layout.selectfeaturetype, null); 
     ListView listView = (ListView) view.findViewById(R.id.listView1); 
     Dialog dialog; 

     switch (id) { 
     case LEGEND_DIALOG: 

      builder.setTitle("Set legend"); 
      builder.setView(view); 


      listView.setAdapter(new BaseAdapter() { 

       @Override 
       public View getView(int position, View convertView, 
         ViewGroup parent) { 

        if(convertView == null) 
        { 
         convertView = inflater.inflate(R.layout.itemwithimage, null); 
        } 
        MyLegend legendItem = data.get(position); 
        if(legendItem != null) 
        { 
         ImageView img = (ImageView) convertView.findViewById(R.id.listimageView); 
         img.setImageBitmap(legendItem.legendImage); 
         TextView txt = (TextView) convertView.findViewById(R.id.listtextView); 
         txt.setText(legendItem.legendname); 
        } 

        return convertView; 
       } 

       @Override 
       public long getItemId(int position) { 

        return position; 
       } 

       @Override 
       public Object getItem(int position) { 
        return data.get(position); 
       } 

       @Override 
       public int getCount() { 

        if (data == null) 
         return 0; 

        return data.size(); 
       } 
      }); 

      dialog = builder.create(); 
      break; 

     default: 

      dialog = null; 
      break; 
     } 
     return dialog. 

Answer 1

は `twice`を提示されてどのように正確に

コード以下

package at.bartinger.list; 

import java.util.ArrayList; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.Dialog; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 

public class PracticeClas extends Activity { 

    ArrayList<String> data = new ArrayList<String>(); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     data.add("Hello"); 
     data.add("Hello One"); 
     data.add("Hello Two"); 
     data.add("Hello Three"); 
     data.add("Hello Four"); 
     data.add("Hello Five"); 
     data.add("Hello Six"); 

     showDialog(0); 
    } 

    protected Dialog onCreateDialog(int id) {   
     final LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View view = inflater.inflate(R.layout.main, null); 
     ListView listView = (ListView) view.findViewById(R.id.LsOne); 
     Dialog dialog = null; 

     dialog = new Dialog(PracticeClas.this); 
     dialog.setContentView(view); 
     dialog.setTitle("Material & Labor:"); 

     // dialog.create(); 
     switch (id) { 
     case 0: 
      listView.setAdapter(new BaseAdapter() { 
       @Override 
       public View getView(int position, View convertView, 
         ViewGroup parent) { 

        if (convertView == null) { 
         convertView = inflater.inflate(
           R.layout.list_item_section, null); 
        } 

        TextView txt = (TextView) convertView 
          .findViewById(R.id.list_item_section_text); 
        txt.setText(data.get(position)); 
        return convertView; 
       } 

       @Override 
       public long getItemId(int position) { 

        return position; 
       } 

       @Override 
       public Object getItem(int position) { 
        return data.get(position); 
       } 

       @Override 
       public int getCount() { 

        if (data == null) 
         return 0; 

        return data.size(); 
       } 
      }); 

      dialog.show(); 
      break; 

     default: 
      dialog = null; 
      break; 
     } 
     return dialog; 
    } 

}