Question

I’m trying to copy and then edit a layout view defined in an XML file.

//Create layout  
LinearLayout layout = new LinearLayout(this);


//Add views
layout = (LinearLayout)findViewById(R.id.layout1);
//layout.addView(textView);

setContentView(layout);

This seems like it should work, but every time I run it, the app crashes when I call line
setContentView(layout);.
I’ve double checked the id’s and they are fine and they are both LinearLayouts.
Any idea what’s going wrong?

Answer 1

Quite simply you can’t call findViewById before setContentView because there is no layout set to find a view in! What will happen probably is findViewById will return null, and then you attempt to set the content as layout (which is null) thus getting an error there.

Call setContentView with your layout resource ID or actual view first, then find your LinearLayout with findViewById.