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

^{Emphasis added}

For those cases within an Activity class.

Activity.findViewById(int id)

Finds a view that was identified by the id attribute from the XML that was processed in onCreate(Bundle).

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Otherwise, such as an Fragment, Adapter, a View from a LayoutInflater, etc.

View.findViewById(int id)

Look for a child view with the given id. If this view has the given id, return this view.

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Either case,

Returns
The view if found or null otherwise.

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Now, re-check your XML files. Make sure you put the right value into setContentView or inflater.inflate.

In the case of an Activity, call findViewById after setContentView.

Then, make sure there is a View you are looking for with android:id="@+id/..." in that layout. Make sure the + is at @+id, which will add the resource to the R.id values to ensure you can find it from Java.