Scroll to top when we reselect the tab once again

skunkworks_crow/src/main/java/org/odk/share/views/ui/send/SendFormsActivity.java

@@ -1,6 +1,7 @@
 package org.odk.share.views.ui.send;
 
 import android.os.Bundle;
+import android.view.View;
 
 import com.google.android.material.tabs.TabLayout;
 
@@ -11,7 +12,9 @@
 import org.odk.share.views.ui.send.fragment.FilledFormsFragment;
 
 import androidx.appcompat.widget.Toolbar;
+import androidx.recyclerview.widget.RecyclerView;
 import androidx.viewpager.widget.ViewPager;
+
 import butterknife.BindView;
 import butterknife.ButterKnife;
 
@@ -24,6 +27,8 @@ public class SendFormsActivity extends InjectableActivity {
     @BindView(R.id.viewpager)
     ViewPager viewPager;
 
+    ViewPagerAdapter adapter;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -35,10 +40,32 @@ protected void onCreate(Bundle savedInstanceState) {
 
         setupViewPager(viewPager);
         tabLayout.setupWithViewPager(viewPager);
+
+
+        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
+            @Override
+            public void onTabSelected(TabLayout.Tab tab) {
+                viewPager.setCurrentItem(tab.getPosition(), true);
+            }
+
+            @Override
+            public void onTabUnselected(TabLayout.Tab tab) {
+            }
+
+            @Override
+            public void onTabReselected(TabLayout.Tab tab) {
+
+                View view = adapter.getItem(tab.getPosition()).getView();
+                if (view != null) {
+                    RecyclerView recyclerView = view.findViewById(R.id.recyclerview);
+                    recyclerView.smoothScrollToPosition(0);
+                }
+            }
+        });
     }
 
     private void setupViewPager(ViewPager viewPager) {
-        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
+        adapter = new ViewPagerAdapter(getSupportFragmentManager());
         adapter.addFrag(new FilledFormsFragment(), getString(R.string.filled_form));
         adapter.addFrag(new BlankFormsFragment(), getString(R.string.blank_form));
         viewPager.setAdapter(adapter);