无法访问 nav_header_main 布局视图

Question

我无法访问 nav_header_main 布局中的视图

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);

    //setting profile picture in nav
    View emailview=navigationView.getHeaderView(2);
    View picview=navigationView.getHeaderView(0);
    View nameview=navigationView.getHeaderView(1);
    email_textview=(TextView)emailview.findViewById(R.id.emailtextView);
    profile_image=(ImageView)picview.findViewById(R.id.profile_imageView);
    username_textview=(TextView)nameview.findViewById(R.id.appbarusernametextview);
    Intent intent =new Intent(this,EmailPasswordActivity.class);
    email=this.getIntent().getExtras().getString("email");
    email_textview.setText(email);

当我使用 headerinflater 时它可以工作，但增加了很多 header

Answer 1

因为你做错了更改此代码

View emailview=navigationView.getHeaderView(2);
View picview=navigationView.getHeaderView(0);
View nameview=navigationView.getHeaderView(1);
email_textview=(TextView)emailview.findViewById(R.id.emailtextView);
profile_image=(ImageView)picview.findViewById(R.id.profile_imageView);
username_textview=(TextView)nameview.findViewById(R.id.appbarusernametextview);

至此

 email_textview=(TextView) navigationView.getHeaderView(0).findViewById(R.id.emailtextView);
 profile_image=(ImageView)navigationView.getHeaderView(0).findViewById(R.id.profile_imageView);
 username_textview=(TextView)navigationView.getHeaderView(0).findViewById(R.id.appbarusernametextview);

Answer 2

View headerView = navigationView.getHeaderView(0)
email_textview = (TextView)headerView.findViewById(R.id.emailtextView);
profile_image = (ImageView)headerView(R.id.profile_imageView);
username_textview = (TextView)headerView(R.id.appbarusernametextview);

试试这个希望对你有帮助

Answer 3

访问 NavigationView Header Childs：

TextView lblUserName = (TextView)navigationView.getHeaderView(0).findViewById(R.id.lblUserName);

无法访问 nav_header_main 布局视图

cannot access nav_header_main layout views

android

navigation-drawer

navigationview