Null pointer Exception - findViewById()

Question

Can anyone help me to find out what can be the issue with this program. In the onCreate() method the findViewById() returns null for all ids and th

Answer 1

In Android, findViewById(R.id.some_id) works when you are finding view in the layout set.

That is, if you have set a layout say:

setContentView(R.layout.my_layout);

Views can be found only in this layout (my_layout).

In your code layout1, layout2, layout3 all are three different layouts and they are not set to the activity.