Question

I am having an error that I don’t understand what does it mean. I am kindly new to Android

Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

I am trying to add a radio group to a table layout programmatically

first I add the radio group to the table layout and i add the radio button to the radio group

RadioGroup mRadioGroup;
mRadioGroup = new RadioGroup(this);
TableLayout mainTable = (TableLayout) findViewById(R.id.myTable);
mainTable.addView(mRadioGroup);

Then I create a row and add the radio group to this row and finally ad the row to the table layout

TableRow row;
RadioButton radioButton = new RadioButton(this);
radioButton.setId(1);
radioButton.setText("SomeText");
row.addView(mRadioGroup);

mainTable.addView(row);

Can any one help ?

EDIT : It worked when i added the radio group directly on the table layout not on a table row

Answer 1

Your problem was that you were adding mRadioGroup to both mainTable and row:

mainTable.addView(mRadioGroup);
...
row.addView(mRadioGroup);

As you partly discovered, remove either one of these lines and it will work.

You don’t have to add a View to a TableRow in order to add it to a TableLayout, but it behaves differently depending on whether or not you do.

Also, you never actually initialized row – make sure to do

TableRow row = new TableRow(this);

before you use it!