android - How to reset the Toolbar position controlled by the CoordinatorLayout? -


the app i'm working on consists of navigation drawer implemented in activity. activity layout follows:

<framelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent">  <android.support.v4.widget.drawerlayout     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent">      <android.support.design.widget.coordinatorlayout         android:id="@+id/coordinator"         android:layout_width="match_parent"         android:layout_height="match_parent">          <framelayout             android:id="@+id/container"             android:layout_width="match_parent"             android:layout_height="match_parent"             app:layout_behavior="@string/appbar_scrolling_view_behavior">          <include             android:id="@+id/appbar"             layout="@layout/appbar" />      </android.support.design.widget.coordinatorlayout>      <android.support.design.widget.navigationview         android:id="@+id/navigation_drawer"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_gravity="start"         app:headerlayout="@layout/header_drawer"         app:menu="@menu/menu_nav">     </android.support.design.widget.navigationview>  </android.support.v4.widget.drawerlayout>  </framelayout>

this common pattern, thing changes fragment inside container layout.

if of fragment has scrolling element, upon scrolling, coordinatorlayout happily make position translations, including toolbar/appbarlayout.

the real problem here is, when fragment gets replaced, position toolbar remains same, i.e., if toolbar hidden, stay isn't intended.

result this:

this:

after scroll

gets stuck:

then change

how can 1 reset toolbar position case?

edit: bug probable, appbarlayout offset change listener gets called when relaunching app (press button , open app), , stops getting called again after intense fling.

to reset scroll state, appbarlayout.behavior object

coordinatorlayout coordinator = (coordinatorlayout) findviewbyid(r.id.coordinator); appbarlayout appbar = (appbarlayout) findviewbyid(r.id.appbar); coordinatorlayout.layoutparams params = (coordinatorlayout.layoutparams) appbar.getlayoutparams(); appbarlayout.behavior behavior = (appbarlayout.behavior) params.getbehavior();

and call onnestedprescroll method manually:

int[] consumed = new int[2]; behavior.onnestedprescroll(coordinator, appbar, null, 0, -1000, consumed);

if reset smoothly animation, can try calling onnestedfling instead:

behavior.onnestedfling(coordinator, appbar, null, 0, -1000, true);

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