AppBarLayout changes the offset programmatically

Question

How can I programmatically change the AppBarLayout offset?

I want some bias towards AppBarLayout (partially extended), when Activity is loaded first, then the user can expand it or collapse it. The current behavior is that it expands completely when Activity is loaded first.

my.xml

<android.support.design.widget.AppBarLayout android:id="@+id/app_bar_layout" android:layout_width="match_parent" android:layout_height="300dp" android:fitsSystemWindows="true" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <android.support.design.widget.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar" android:layout_width="match_parent" android:layout_height="match_parent" android:clickable="true" android:fitsSystemWindows="true" app:expandedTitleMarginEnd="64dp" app:expandedTitleMarginStart="48dp" app:layout_collapseParallaxMultiplier="0.7" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" app:layout_collapseMode="parallax"> <ImageView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop" android:src="@drawable/pic"/> <View android:id="@+id/overlay" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/overlay" app:layout_collapseMode="pin"/> </FrameLayout> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:popupTheme="@style/ThemeOverlay.AppCompat.Light" app:title="@string/app_name"/> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> 

Must support API 16+

Thanks!

Answer 1

Use this: ScrollableAppBar

You just need to replace AppBarLayout with:

 <it.michelelacorte.scrollableappbar.ScrollableAppBar android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="380dp" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" android:fitsSystemWindows="true"> </it.michelelacorte.scrollableappbar.ScrollableAppBar> 

and than:

 ScrollableAppBar appBarLayout = (ScrollableAppBar) findViewById(R.id.appbar); //To give the effect "in the middle" of the image (like gif) appBarLayout.collapseToolbar(); 

Output: