You can use layout_behavior to handle the lines you want to delete when scrolling. Customize your behavior with CoordinatorLayout.Behavior
ViewBehavior.java
public class ViewBehavior extends CoordinatorLayout.Behavior<RelativeLayout> { private Context mContext; public ViewBehavior(Context context, AttributeSet attrs) { mContext = context; } @Override public boolean layoutDependsOn(CoordinatorLayout parent, RelativeLayout child, View dependency) { return dependency instanceof AppBarLayout; } @Override public boolean onDependentViewChanged(CoordinatorLayout parent, RelativeLayout child, View dependency) { child.measure(View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY), View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.AT_MOST)); int maxScroll = ((AppBarLayout) dependency).getTotalScrollRange(); float percentage = Math.abs(dependency.getY()) / (float) maxScroll; float childPosition = dependency.getHeight() + dependency.getY() - child.getMeasuredHeight() - (getToolbarHeight() - child.getMeasuredHeight()) * percentage / 2; CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams(); child.setLayoutParams(lp); child.setY(childPosition); return true; } public int getToolbarHeight() { int result = 0; TypedValue tv = new TypedValue(); if (mContext.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) { result = TypedValue.complexToDimensionPixelSize(tv.data, mContext.getResources().getDisplayMetrics()); } return result; } }
In the xml layout, configure your behavior in the form app: layout_behavior in the view you want to handle.
activity_main.xml
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/coordinator_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <android.support.design.widget.AppBarLayout android:id="@+id/app_bar_layout" android:layout_width="match_parent" android:layout_height="match_parent" 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:fitsSystemWindows="true" app:contentScrim="?attr/colorPrimary" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <ImageView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" app:layout_collapseMode="parallax" /> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <LinearLayout android:id="@+id/llViewPager" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <com.astuetz.PagerSlidingTabStrip android:id="@+id/tabs" android:layout_width="match_parent" android:layout_height="48dp" android:textColor="@color/red" app:pstsShouldExpand="true" app:pstsTextAllCaps="true" /> <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@android:color/white" /> </LinearLayout> </android.support.v4.widget.NestedScrollView> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="com.stacktest.ViewBehavior"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_marginBottom="20dp" android:layout_marginLeft="36dp" android:layout_marginTop="20dp" android:text="Text-1" /> <TextView android:id="@+id/txt2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_marginBottom="20dp" android:layout_marginRight="36dp" android:layout_marginTop="20dp" android:text="Text-2" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@id/txt2" android:layout_marginBottom="20dp" android:layout_marginLeft="36dp" android:paddingRight="20dp" android:text="Text-3" /> <TextView android:id="@+id/txt4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_below="@id/txt2" android:layout_marginBottom="20dp" android:layout_marginRight="36dp" android:text="Text-4" /> </RelativeLayout> </android.support.design.widget.CoordinatorLayout>
Finally, use the layout and create the ViewPager and tabs in the Activity class.
MainActivity.java
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ((CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar)).setTitle(" "); ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager); viewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager())); PagerSlidingTabStrip tabsStrip = (PagerSlidingTabStrip) findViewById(R.id.tabs); tabsStrip.setViewPager(viewPager); } public class MyPagerAdapter extends FragmentPagerAdapter { final int PAGE_COUNT = 2; private String tabTitles[] = new String[] { "Tab1", "Tab2" }; public MyPagerAdapter(FragmentManager fm) { super(fm); } @Override public int getCount() { return PAGE_COUNT; } @Override public Fragment getItem(int position) { return TestFragment.newInstance(position + 1); } @Override public CharSequence getPageTitle(int position) { return tabTitles[position]; } } }
Add the following additional dependency to build.gradle along with the appcompat library and support.
- com.android.support:design:23.2.1
- com.astuetz: pagerslidingtabstrip: 1.0.1 (for ViewPager tabs)