Problema durante la visualizzazione di nomi degli elementi, insieme alle immagini che sono memorizzati nella SQLite per Android

Question

sto memorizzazione degli elementi e dei loro dettagli nel SQLite e la visualizzazione delle immagini degli oggetti con i nomi degli elementi per cui sto usando

 private void getDataAndPopulate() 
     { 
     Cursor cursor = getEvents("bcuk_book"); 
     while (cursor.moveToNext()) 
     { 
      String temp_id = cursor.getString(0); 
      final String temp_name = cursor.getString(1); 
      String temp_author=cursor.getString(2); 
      String temp_desc=cursor.getString(3); 
      byte[] temp_image = cursor.getBlob(4); 
      String temp_rating = cursor.getString(5); 
      String temp_price = cursor.getString(6); 
      String temp_update=cursor.getString(7); 
      mapId.add(temp_id); 
      mapName.add(temp_name); 
      mapAuthor.add(temp_author); 
      mapDesc.add(temp_desc); 
      mapRating.add(temp_rating); 
      mapPrice.add(temp_price); 
      map.add(temp_image); 
      mapUpdated.add(temp_update); 
       Log.e("temp_id from the sqlite", temp_id); 
       Log.i(temp_name, temp_name); 
       Log.i(temp_desc, temp_desc); 
       Log.i(temp_rating, temp_rating); 
       Log.e(temp_update,temp_update); 
       String[] captionArray = (String[]) mapName.toArray(new String[mapName.size()]); 
       itemsAdapter = new ItemsAdapter(
         Bookicon.this, R.layout.item,captionArray); 
       gridView=(GridView)findViewById(R.id.list); 
       gridView.setAdapter(itemsAdapter); 
       gridView.setOnItemClickListener(new OnItemClickListener() { 
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) 
        { 
         Intent i = new Intent(getApplicationContext(), DetailsActivity.class); 

         i.putExtra("id", position); 

         startActivity(i); 
        } 
       }); 
     } 
     } 

e mie classe adattatore è ::

private class ItemsAdapter extends BaseAdapter implements ListAdapter 
    { 
     String[] items; 
     public ItemsAdapter(Context context,int textViewResourceId,String[] items) 
     { 
      this.items = items; 
     } 
     public View getView(int POSITION, View convertView,ViewGroup parent) 
     { 
      TextView cap = null ; 
      View view = convertView; 
      ImageView img = null; 
      if (view == null) 
      { 
       LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       view = vi.inflate(R.layout.item, null); 
      } 
      img = (ImageView) view.findViewById(R.id.image); 
      Log.i("iiiiii","iiiii"); 
      cap = (TextView) view.findViewById(R.id.caption); 
      System.err.println("Position of the book is "+mapName.get(POSITION)); 
      bookTitle=mapName.get(POSITION); 
      System.err.println("title of the book is "+bookTitle); 
      cap.setText(mapName.get(POSITION)); 
      img.setImageBitmap(BitmapFactory.decodeByteArray(map.get(POSITION), 0, map.get(POSITION).length)); 
      return view; 
     } 
     public int getCount() 
     { 
      return items.length; 
     } 
     public Object getItem(int position) 
     { 
      return position; 
     } 
     public long getItemId(int position) 
     { 
      return position; 
     } 
    } 

l'errore durante la visualizzazione è ::

 12-21 10:12:28.792: W/dalvikvm(741): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 
     12-21 10:12:28.842: E/AndroidRuntime(741): FATAL EXCEPTION: main 
     12-21 10:12:28.842: E/AndroidRuntime(741): java.lang.IndexOutOfBoundsException: Invalid index 56, size is 56 
     12-21 10:12:28.842: E/AndroidRuntime(741): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at java.util.ArrayList.get(ArrayList.java:304) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.books.bcukbook.Bookicon$ItemsAdapter.getView(Bookicon.java:254) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.AbsListView.obtainView(AbsListView.java:2012) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.makeAndAddView(GridView.java:1323) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.makeRow(GridView.java:328) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.moveSelection(GridView.java:885) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.layoutChildren(GridView.java:1230) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.setSelectionInt(GridView.java:1476) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.arrowScroll(GridView.java:1729) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.commonKey(GridView.java:1543) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.widget.GridView.onKeyDown(GridView.java:1494) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.KeyEvent.dispatch(KeyEvent.java:2551) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.View.dispatchKeyEvent(View.java:5500) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1242) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1879) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1361) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.app.Activity.dispatchKeyEvent(Activity.java:2324) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3327) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewRootImpl.handleFinishedEvent(ViewRootImpl.java:3300) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2460) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.os.Handler.dispatchMessage(Handler.java:99) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.os.Looper.loop(Looper.java:137) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at android.app.ActivityThread.main(ActivityThread.java:4424) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at java.lang.reflect.Method.invokeNative(Native Method) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at java.lang.reflect.Method.invoke(Method.java:511) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
     12-21 10:12:28.842: E/AndroidRuntime(741): at dalvik.system.NativeStart.main(Native Method) 

Il risultato del codice mostra come

Answer 1

Nel vostro primo blocco di codice è necessario chiudere il ciclo while prima di impostare il GridView come codice seguente:

private void getDataAndPopulate() 
     { 
     //assuing that they are not null at this point.. 
     mapId.clear(); 
     mapName.clear(); 
     mapAuthor.clear(); 
     mapDesc.clear(); 
     mapRating.clear(); 
     mapPrice.clear(); 
     map.clear(); 
     mapUpdated.clear(); 

     Cursor cursor = getEvents("bcuk_book"); 
     while (cursor.moveToNext()) 
     { 
      String temp_id = cursor.getString(0); 
      final String temp_name = cursor.getString(1); 
      String temp_author=cursor.getString(2); 
      String temp_desc=cursor.getString(3); 
      byte[] temp_image = cursor.getBlob(4); 
      String temp_rating = cursor.getString(5); 
      String temp_price = cursor.getString(6); 
      String temp_update=cursor.getString(7); 
      mapId.add(temp_id); 
      mapName.add(temp_name); 
      mapAuthor.add(temp_author); 
      mapDesc.add(temp_desc); 
      mapRating.add(temp_rating); 
      mapPrice.add(temp_price); 
      map.add(temp_image); 
      mapUpdated.add(temp_update); 
       Log.e("temp_id from the sqlite", temp_id); 
       Log.i(temp_name, temp_name); 
       Log.i(temp_desc, temp_desc); 
       Log.i(temp_rating, temp_rating); 
       Log.e(temp_update,temp_update); 
      }//this would close the while loop 

       String[] captionArray = (String[]) mapName.toArray(new String[mapName.size()]); 
       itemsAdapter = new ItemsAdapter(
         Bookicon.this, R.layout.item,captionArray); 
       gridView=(GridView)findViewById(R.id.list); 
       gridView.setAdapter(itemsAdapter); 
       gridView.setOnItemClickListener(new OnItemClickListener() { 
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) 
        { 
         Intent i = new Intent(getApplicationContext(), DetailsActivity.class); 

         i.putExtra("id", position); 

         startActivity(i); 
        } 
       }); 

     } 

chiaro anche tutta la vostra elenco prima di passare al ciclo while ..

Supponendo che si stia utilizzando ArrayList Ho aggiornato il codice per cancellare i dati dell'elenco rientrare nel ciclo while ..