Android tablelayout view does not appear

Question

New to android programming.

I have a layout XML, to which I want to add a list (with items from a database), formatted as a table.

Here\'s the code:

Answer 1

Ok, I think I have an answer for you.

You need to be more specific when you are specifying LayoutParams. While it doesn't throw a compile exception, if you don't specify the correct parent class of the LayoutParams, nothing will show up.

When you specify layout params, you need to use the class of the container where the object is going. If you are setting the layout paramters of a textview that is going inside a LinearLayout, you would use new LinearLayout.LayoutParams(...) similarily if you are creating a textview to go inside a TableRow, you need to use TableRow.LayoutParams(...)

Below is the full code with minor modifications because I didn't have a db setup.

    LinearLayout mainLayout = (LinearLayout) findViewById(R.id.edit_cat);

    //Create table layout for the categories        
    TableLayout catList = new TableLayout(this);

    //Set the table layout to Match parent for both width and height
    // Note: We use LinearLayout.LayoutParams because the TableLayout is going inside a LinearLayout

    catList.setLayoutParams(
        new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));


    //Iterate the categories, and organize in tables      
    for(int i = 0; i < 5; i++)
    {
        TableRow tr = new TableRow(this);
        /* Since the table row is going inside a table layout, we specify the parameters using TableLayout.LayoutParams */
        tr.setLayoutParams(new TableLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));

        //Display category name
        TextView name = new TextView(this);

        /* Since the TextView is going inside a TableRow, we use new TableRow.LayoutParams ... */
        name.setLayoutParams(new TableRow.LayoutParams(
                TableRow.LayoutParams.FILL_PARENT,
                TableRow.LayoutParams.WRAP_CONTENT));

        name.setText("Test Row - " + i);
        name.setBackgroundColor(Color.RED);


        //Display category type
        TextView type = new TextView(this);
        type.setText("Type Row - " + i);
        type.setBackgroundColor(Color.GREEN);
        type.setLayoutParams(new TableRow.LayoutParams(
                TableRow.LayoutParams.FILL_PARENT,
                TableRow.LayoutParams.WRAP_CONTENT));

        //Display edit button
        Button btnEdit = new Button(this);
        btnEdit.setText("Edit");

        btnEdit.setLayoutParams(new TableRow.LayoutParams(
                TableRow.LayoutParams.FILL_PARENT,
                TableRow.LayoutParams.WRAP_CONTENT));

        //Display delete button
        Button btnDelete = new Button(this);
        btnDelete.setText("Delete");

        btnDelete.setLayoutParams(new TableRow.LayoutParams(
                 TableRow.LayoutParams.FILL_PARENT,
                 TableRow.LayoutParams.WRAP_CONTENT));


        tr.addView(name);
        tr.addView(type);
        tr.addView(btnEdit);
        tr.addView(btnDelete);

        catList.addView(tr);
    }


    mainLayout.addView(catList);