How to use @ViewById for an inflated view outside of @EActivity(R.layout.activity_x)

Question

I am using Android Annotations 3.1 in my project in Android Studio and I am using an Expandable List View.

I am adding a header to my list like this:

View header = getLayoutInflater().inflate(R.layout.list_view_header, null);
txt_user = (TextView) header.findViewById(R.id.txt_user);
txt_user.setText(" ... "); 
mExpandableListView.addHeaderView(header);

Question:

How can I use @ViewById to set my TextView to:

- avoid using findViewById

- changing its text

- and then adding that as a header during:

@AfterViews
protected void init() {
 ....

}

If I do this inside my Activity when using my text view inside init:

@ViewById
TextView txt_user;

It gives null pointer exception.

Answer 1

Why don't you create a custom view like this :

@EViewGroup(R.layout.list_view_header)
public class MyHeader extends LinearLayout {

     @ViewById(R.id.txt_user)
     protected TextView mTextView;

     public void setText(String text) {
         mTextView.setText(text);
     }
     public MyHeader(Context context) {
         super(context);
     }
}

Then, in your Activity, write this :

@EActivity(R.layout.activity_xxx)
public class MyActivity extends Activity {

    private MyHeader mHeader;

    @AfterViews
    protected void init() {
        mHeader = MyHeader_.build(this);
        mHeader.setText("...");
        mExpandableListView.addHeaderView(mHeader);
    }
}