Replace toolbar layout according to the displayed fragment

Question

I have an activity with navigation drawer which replace the main_fragment_container on the activity. When one of the fragments is displayed I want to change the layout of the toolbar and add a spinner to it (and remove it when the fragment is hidden).

My layout looks like that:

<LinearLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     xmlns:sothree="http://schemas.android.com/apk/res-auto" android:id="@+id/main_parent_view" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:fitsSystemWindows="true">  <android.support.v7.widget.Toolbar      android:id="@+id/toolbar"     android:layout_width="match_parent"     android:layout_height="wrap_content"     sothree:theme="@style/AppTheme.ActionBar" />  <android.support.v4.widget.DrawerLayout     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent">      <!-- Main layout -->     <FrameLayout         android:id="@+id/main_fragment_container"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <!-- Nav drawer -->     <fragment         android:id="@+id/fragment_drawer"         android:name="com.idob.mysoccer.ui.DrawerFragment"         android:layout_width="@dimen/navigation_drawer_width"         android:layout_height="match_parent"         android:layout_gravity="left|start" /> </android.support.v4.widget.DrawerLayout> 

Answer 1

Not sure what you are trying to accomplish but I think, if possible, you should approach this by letting the fragments customize your toolbar rather than replacing it. Your can let your fragments hide/show views on the toolbar depending on your needs.

Add setHasOptionsMenu(true); in the fragments OnCreateView() and then override onOptionsMenuCreated()

Like this:

@Override public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {     setHasOptionsMenu(true);     return inflater.inflate(R.layout.result_list, container, false); }  @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {     inflater.inflate(R.menu.this_frag_menu, menu);     super.onCreateOptionsMenu(menu, inflater); } 

If you need to do more specific things with the toolbar you can get the instance using

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);