How to access Button inside “include” layout

问题:

Refer to the doc: http://android-developers.blogspot.com/2009/02/android-layout-tricks-2-reusing-layouts.html

I have a button inside the included layout, how can I access the button? I don't know the id! How can I define the OnClickListener...?

Please help...

回答1:

The id you have with the include tag is assigned to the root View of the included layout. First get a reference to that View using findViewByid. Then you can call findViewById on that specific View to get a reference to a View inside the layout. So:

View myLayout = findViewById( R.id.cell1 ); // root View id from that link
View myView = myLayout.findViewById( R.id.someinnerview ); // id of a view contained in the included file

回答2:

All you need is the id of the parent view:

In this example, the LinearLayout is the parent of the TextView I want from the included View.

I can now do this:

    View view = findViewById(R.id.include_title_layout);
    TextView titleTV = (TextView) view.findViewById(R.id.newsTitleTextView);
    titleTV.setText("Whatever");

回答3:

There's a common pitfall with regard to resolving widget IDs when including the same XML layout multiple times. A blog post at http://www.coboltforge.com/2012/05/tech-stuff-layout/ explains exactly that problem and how to solve it!

回答4:

You do know the id of the include. You can get that complete element, and then get one of its children starting from there.

回答5:

Actually include tags include all the elements in your root layout. So you can always access them using findViewById on your Activity.

Suppose you have a alayout.xml in which there is a include layout. Now in one of your activity A,inside onCreate you declared setContentView(R.layout.alayout) Now inside your include layout you might have a button with id myBtn. You can access that inside onCreate in the same way you could access it if it were in main layout: findViewById(R.id.myBtn)

回答6:

i think your mean is NavigationView. you can access to inner layout by this way:

NavigationView ngv= (NavigationView) findViewById(R.id.navigation_id);
View innerview =  ngv.getHeaderView(0);
TextView user_view= (TextView)innerview.findViewById(R.id.nav_name); //any you need
user_view.setText(user);