[android help] action bar item onoptionitemselected

I'm using action bar in my application and I want when the user clicks a button, the item in action bar should change text.

This is my code for onOptionsItemSelected()

public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.action_refresh:
        Toast.makeText(this, "Menu Item 1 selected", Toast.LENGTH_SHORT)
                .show();
        finish();
        break;
    case R.id.lg:

        Toast.makeText(getBaseContext(), "ma", Toast.LENGTH_SHORT).show();
        break;

    case R.id.French:

        Toast.makeText(getBaseContext(), "zaki", Toast.LENGTH_SHORT).show();

        break;
    case R.id.nerlandais:
        Toast.makeText(getBaseContext(), "brahim", Toast.LENGTH_SHORT)
                .show();

    }

    return true;
}

What must I do to add to change the item title from another item.

Example: When I click in French item I want to change nerlandais item title.

.

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