動態創建TableRow，然後RelativeLayout不顯示

Question

我遍歷中創建RelativeLayouts的查詢結果。如果我嘗試爲RelativeLayout設置LayoutParams，則不顯示任何內容並且不會出現錯誤。如果我不那麼一切都會出現，但版面設置爲WRAP_CONTENT。我已經嘗試了幾個例子，並且無法使其工作。下面是我的代碼：

  TableLayout tblItems = (TableLayout) findViewById(R.id.tblItems); 

      // Fields from the database (projection) 
      String[] projection = new String[] { ItemsTable.ITEM_ID, 
               ItemsTable.ITEM_NAME, 
               ItemsTable.ITEM_PRICE, 
               ItemsTable.ITEM_PICTURE };   
      Cursor cursor = getContentResolver().query(ItemsTable.CONTENT_URI, projection, null, null, null);     
      startManagingCursor(cursor);   

      // Establish the item mapping 
//   String[] columns = new String[] {"name", "price"}; 
//   int[] to = new int[] {R.id.tv_description, R.id.tv_price}; 

//   adapter = new SimpleCursorAdapter(this, R.layout.item_list_select, cursor, columns, to, 0); 
//   lvSelectItems.setAdapter(adapter); 

/*   
      adapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() { 

       public boolean setViewValue(View view, Cursor cursor, int columnIndex) { 
        if(columnIndex == cursor.getColumnIndexOrThrow(OrderDetailTable.ORDERDETAIL_PRICE)) { 

        //   String createDate = aCursor.getString(aColumnIndex); 
        //   TextView textView = (TextView) aView; 
        //   textView.setText("Create date: " + MyFormatterHelper.formatDate(getApplicationContext(), createDate)); 

          double total = cursor.getDouble(columnIndex); 
          TextView textView = (TextView) view; 
          textView.setText("$" + String.format("%.2f",dRound(total, 2))); 

          return true; 
        } 
        return false; 
       } 

      }); 
*/   
      // tblItems 

      int totalRows = 0; 
      int tcolumn = 1; 

      int numItems = cursor.getCount(); 
      double tempRow = numItems/2; 

      if (numItems > 0) { 
       itemsFound = true; 
      } else { 
       itemsFound = false; 
      } 

      long iPart; // Integer part 
      double fPart; // Fractional part 
      boolean ifFirst = true; 

      // Get user input 
      iPart = (long) tempRow; 
      fPart = tempRow - iPart; 

      if (fPart > 0) { 
       totalRows = (int) (iPart + 1); 
      } else { 
       totalRows = (int) iPart; 
      } 

      TableRow row = null; 

      cursor.moveToFirst(); 
      while (cursor.isAfterLast() == false) 
      { 
       // tblItems // TableLayout 
       // TableRow 
       // RelativeLayout 
       // ImageView 
       // TextView 
       // TextView 

       if (ifFirst) { 
        // create a new TableRow 
        row = new TableRow(this); 
        ifFirst = false; 
       } 

       // Creating a new RelativeLayout 
       RelativeLayout relativeLayout = new RelativeLayout(this); 


       // Defining the RelativeLayout layout parameters. 
       // In this case I want to fill its parent 
       RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.WRAP_CONTENT, 
         RelativeLayout.LayoutParams.WRAP_CONTENT); 

       rlp.setMargins(5, 5, 5, 5); 

       relativeLayout.setPadding(5, 5, 5, 5); 
       relativeLayout.setBackgroundResource(R.drawable.grpbx_item); 

       row.addView(relativeLayout, rlp); 

       // add text view 
       ImageView imgPic = new ImageView(this); 
       imgPic.setBackgroundResource(R.drawable.takepic); 
       imgPic.setPadding(0, 0, 0, 0); 
       relativeLayout.addView(imgPic); 

       // add text view 
       TextView tvName = new TextView(this); 
       String name = cursor.getString(cursor.getColumnIndexOrThrow(ItemsTable.ITEM_NAME)); 
       tvName.setText("" + name); 

      // Defining the layout parameters of the TextView 
       RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.WRAP_CONTENT, 
         RelativeLayout.LayoutParams.WRAP_CONTENT); 
       lp.addRule(RelativeLayout.CENTER_IN_PARENT); 

      //  RelativeLayout. 

       // Setting the parameters on the TextView 
       tvName.setLayoutParams(lp); 
       relativeLayout.addView(tvName); 

       // add text view 
       double iPrice = cursor.getDouble(cursor.getColumnIndexOrThrow(ItemsTable.ITEM_PRICE)); 

       TextView tvPrice = new TextView(this); 
       tvPrice.setText("$" + String.format("%.2f",dRound(iPrice, 2))); 
       relativeLayout.addView(tvPrice); 


       tcolumn++; 

       numItems--; 

       if (tcolumn == 3) { 
        // add the TableRow to the TableLayout 
        tblItems.addView(row,new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 

        // create a new TableRow 
        row = new TableRow(this); 
        tcolumn = 1; 
       } else { 
        if (numItems == 0) { 
         // add the TableRow to the TableLayout 
         tblItems.addView(row,new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
        } 
       } 

       // Move to the next record 
       cursor.moveToNext(); 
      } 

     } 

Answer 1

如果我嘗試設置爲RelativeLayout的佈局PARAMS再沒有什麼 出現，並沒有錯誤。如果我沒有，那麼一切都會出現，但 佈局被設置爲wrapcontent。

您對RelativeLayout使用了錯誤的LayoutParams。您可以使用：

RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.WRAP_CONTENT, 
         RelativeLayout.LayoutParams.WRAP_CONTENT); 
row.addView(relativeLayout, rlp); 

而是作爲RelativeLayout的父母是TableRow必須使用TableRow.LayoutParams：

TableRow.LayoutParams rlp = new TableRow.LayoutParams(
         TableRow.LayoutParams.FILL_PARENT, 
         TableRow.LayoutParams.WRAP_CONTENT); 
row.addView(relativeLayout, rlp);