Thursday, 6 March 2014

Use dynamically placed editable elements in Android Table Layout

It may be very useful if in an activity of an Android application, the user is allowed to define dynamically the number of elements in a Table Layout. These elements maybe editable like Check Boxes, Edit Text fields or Spinners. After the user interacts with these elements the data are passed to the next activity generating some results.
Here is an example of an application in the first activity of which the user is allowed to define the number of CheckBoxes that will appear in a Table Layouts in the next activity. Then, the user may check some boxes and this will affect the text appearing in the final activity. The text in the final activity is a binary string where 1 stands for a checked corresponding CheckBox and 0 for an unchecked one.
I must give credit to the useful ideas found in the answers of a post of stackoverflow; find it is here.
In the main activity it is enough to place an EditText field in which the user will enter the desired number of CheckBoxes and a button that will activate an intent like the following which will send the number to the next activity.

        EditText editText1 = (EditText) findViewById(;
        Intent intent1 = new Intent(MainActivity.this, TableActivity.class);
        intent1.putExtra(DATA, fnum);

In the next activity I form a layout with a scrollable Table Layout

        android:layout_above="@+id/button1" >

        android:layout_above="@+id/button1" >

Then in the Table Layout, there is a number of Check Boxes dynamically placed using a loop to add it in a Table Row.

       public class TableActivity extends Activity {
       public final static String LIST = "com.TableActivity.LIST";
       int fnum;
      TableLayout table;
      int[] data;
       protected void onCreate(Bundle savedInstanceState) {
        Intent intent1 = getIntent();
        fnum=intent1.getIntExtra(MainActivity.DATA, 0);
        table = new TableLayout(this);
        for (int i = 0; i < fnum; i++) {
            TableRow row = new TableRow(this);
            CheckBox checkbox = new CheckBox(this);
            checkbox.setText("Box #"+Integer.toString(i+1));                   

        TableLayout tablelayout = (TableLayout) findViewById(;

Also I use a method in order to pass in the next activity the information of whether each Check Box is checked or not.

           public void done(View view){
            data=new int[fnum];
            TableLayout tablelayout1 = (TableLayout) table;
            for(int i=0;i<fnum;i++){
                TableRow tablerow = (TableRow) tablelayout1.getChildAt(i);
                CheckBox checkbox = (CheckBox) tablerow.getChildAt(0);
                    data[i] = 1;

It is easy to show the result in the last activity.

        Intent intent1 = getIntent();
        String s=Arrays.toString(data);
        TextView textView = (TextView) findViewById(;

You may find the layout and java source files here.

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