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this is desired table layout:

+++++++++++++
+ + + +
+ 1 + 2 + 3 +
+ + + +
+++++++++++++
+ + + +
+ 4 + 5 + 6 +
+ + + +
+++++++++++++
+ + + +
+ 7 + 8 + - +
+ + + +
+++++++++++++

My table is dynamically created based on json data:

TableLayout tl = (TableLayout) findViewById(R.id.table);
JSONArray jsonArray = new JSONArray( all_gpio_json );

 for ( i = 0; i < jsonArray.length(); i++) 

 ...some dynamic table generation code like this:
 TableRow row = new TableRow(this);
 Switch sw = new Switch( this );
 row.addView(sw);


tl.addView( row );

There is no problem to have table generated so, that each json value is represented by unique row, however i'd like to have layout that will have maximum 3 columns per row, and number of rows will be dynamically growing as long as there are json data in the loop.

I tried to add new row after existing row has 3 items filled already:

if (i % 3 == 1) TableRow new_row = new TableRow( this );

But im getting an error when new_row is supposed to be added:

 E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.comain.tests, PID: 15519
 java.lang.RuntimeException: Unable to start activity ComponentInfocom.comainxxx.tests/com.comainxxx.tests.MainActivity: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

Anyone would have an idea how to achieve this to add new row on the fly?

EDIT: Solved by implementing grid view, that is more suitable for this task.

It is possible in java. U need to declare that variable outside the if condition. Try below code

 TableRow new_row = new TableRow(this);

 for ( i = 0; i < jsonArray.length(); i++) 

 if (i % 3 == 0 && i != 0) new_row = new TableRow( this );
 .......
 Switch sw = new Switch( this );
 new_row .addView(sw);

EDIT: Solved by implementing grid view, that is more suitable for this task.