值不填充在列表视图

Question

我想开发一个可以显示多个表中的值的android应用程序。

我已经使用Base Adapter来显示值，因为我只需要在列表中显示查询的值。但是当我尝试在列表视图中显示值时，它是空白的。

我不知道我做错了什么。

我使用下面的方法来查询数据库中的数据，只显示所需的值。

public Cursor getAssetInStore() 
    { 

     SQLiteDatabase db_database = getReadableDatabase(); 

     Cursor c = db_database.rawQuery("SELECT asset_name,warrenty,AssetImage,asset_status FROM `Assets`,`AseetIssued` WHERE Assets.Assetid = AseetIssued.Assetissuedid AND asset_status =?" , 
       new String [] {"In Storage"}, null); 
     return c; 

    } 

以下方法用于将值填充到列表视图中。

private void populateAssetListView() 
    { 

     Cursor c = db_database.getAssetInStore(); 
     AssetListView.setAdapter(new AssetListAdapter(this, c)); 


    } 


    public class AssetListAdapter extends BaseAdapter 
    { 

     private Context mContext; 
     Cursor cursor; 

     public AssetListAdapter(Context context, Cursor c) { 
      super(); 

      mContext = context; 
      cursor =c ; 

     } 


     @Override 
     public int getCount() { 
      return 0; 
     } 

     @Override 
     public Object getItem(int position) { 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      return 0; 
     } 

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

      LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      //The layout is assigned to the custome created created in this case it is customeassetview the cales will be displayed as per this list 
      view = inflater.inflate(R.layout.assetsinstore_placeholder, null); 

      cursor.moveToPosition(position); 

      TextView Assetsstatus = (TextView) view.findViewById(R.id.Assetssatutsstore_view); 
      int status = cursor.getInt(cursor.getColumnIndex("asset_status")); 
      Assetsstatus .setText(String.valueOf(status)); 

      TextView Assetsname = (TextView) view.findViewById(R.id.Assetstore_name_view); 
      String Assetname = cursor.getString(cursor.getColumnIndex("asset_name")); 
      Assetsname.setText(Assetname); 

      TextView Warrenty = (TextView) view.findViewById(R.id.Assetstore_Warrenty_view); 
      String CustDesignation = cursor.getString(cursor.getColumnIndex("warrenty")); 
      Warrenty .setText(CustDesignation); 


      ImageView AssetImage = (ImageView) view.findViewById(R.id.list_image); 

      byte[] bb = cursor.getBlob(cursor.getColumnIndex("AssetImage")); 
      AssetImage.setImageBitmap(BitmapConver.getPhoto(bb)); 

      return view; 
     } 
    } 

Answer 1

尝试使用游标适配器代替基本适配器。此外，请注意，您传递给光标的位置可能不是您的想法。