CoordinatorLayout + TabView + AnimateView(From Top)

Question

Yesterday I am playing with CoordinatorLayout with TabView

1) What is my target ?

• CoordinatorLayout with TabView
• When I scroll up at that time One View As show in .GIF move down.
• and Stick on the Top of the TabView (inside AppBar).

2) Where I reached ?

• CoordinatorLayout with TabView with pretty scrolling.
• TabView with Appbar Stop Scrolling At Top after Then Scroll RecyclerView.

3) Where I stuck ?

• When I scroll Up One View Scroll Down but TabView Stick At Top not like 1st gif.

4) Code snippet

• Xml file

  <android.support.design.widget.AppBarLayout
      android:id="@+id/main.appbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:fitsSystemWindows="true"
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
      <!--- ADD TAB_LAYOUT HERE -->
  
  
      <android.support.design.widget.CollapsingToolbarLayout
          android:id="@+id/main.collapsing"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fitsSystemWindows="true"
          app:expandedTitleMarginEnd="64dp"
          app:expandedTitleMarginStart="48dp"
          app:layout_scrollFlags="scroll">
  
          <ImageView
              android:id="@+id/main.backdrop"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:fitsSystemWindows="true"
              android:scaleType="centerCrop"
              android:src="@drawable/abc"
              app:layout_collapseMode="none" />
  
  
          <!-- ADD ANY THING THAT GETS SCROLLED ALL THE WAY UP WITH TOOLBAR -->
      </android.support.design.widget.CollapsingToolbarLayout>
  
  
      <!-- our tablayout to display tabs  -->
      <android.support.design.widget.TabLayout
          android:id="@+id/tabLayout"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:background="?attr/colorPrimary"
          android:minHeight="?attr/actionBarSize"
  
          android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />
  
  
  </android.support.design.widget.AppBarLayout>
  
  
  <android.support.v4.view.ViewPager
      android:id="@+id/pager"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_behavior="@string/appbar_scrolling_view_behavior" />
  

• Java file (move upper view down code)

  AppBarLayout ab = (AppBarLayout) findViewById(R.id.main_appbar);ab.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
      @Override
      public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
  
          int ScrollStart = (ab.getHeight() - tabLayout.getHeight() - llTop.getHeight() - llTop.getHeight());
          int scrollStop = (ab.getHeight() - tabLayout.getHeight() - llTop.getHeight());
          if ((-verticalOffset) > ScrollStart && (-verticalOffset) < scrollStop) {
              llTop.setVisibility(View.VISIBLE);
              llTop.setTranslationY(((-verticalOffset) - ScrollStart) - llTop.getHeight());
              Log.e("point", "" + ((-verticalOffset) - ScrollStart));
  
          } else if ((-verticalOffset) >= scrollStop) {
              llTop.setVisibility(View.VISIBLE);
          } else {
              llTop.setVisibility(View.INVISIBLE);
          }
  
  
      }
  });
  

Answer 1

It's tricky little bit..

just try to setMinimumHeight of your CollapsingToolbarLayout like this way and do let me know.

CollapsingToolbarLayout layoutCollapsing = (CollapsingToolbarLayout) rootView.findViewById(R.id.layoutCollapsing);
layoutCollapsing.setMinimumHeight(120); 

here calculate your minimum height as per your need and set it in place of setMinimumHeight(120) value.