import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class MessagesAdapter extends RecyclerView.Adapter<MessagesAdapter.ViewHolder> {
private SearchFragment mContext;
private ArrayList<ChatRoom> chatRoomArrayList;
private static String today;
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView name, message, timestamp, count;
public ViewHolder(View view) {
super(view);
name = (TextView) view.findViewById(R.id.name);
message = (TextView) view.findViewById(R.id.message);
timestamp = (TextView) view.findViewById(R.id.timestamp);
count = (TextView) view.findViewById(R.id.count);
}
}
public MessagesAdapter(SearchFragment mContext, ArrayList<ChatRoom> chatRoomArrayList) {
this.mContext = mContext;
this.chatRoomArrayList = chatRoomArrayList;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.chat_rooms_list_row, parent, false);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
ChatRoom chatRoom = chatRoomArrayList.get(position);
holder.name.setText(chatRoom.getName());
holder.message.setText(chatRoom.getLastMessage());
holder.timestamp.setText(chatRoom.getTimestamp());
holder.count.setText(chatRoom.getUnreadCount());
}
@Override
public int getItemCount() {
return chatRoomArrayList.size();
}
}@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_message, container, false);
Toolbar toolbar = view.findViewById(R.id.toolbar);
((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
toolbar.setTitle(getString(R.string.message_fragment));
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabs = (TabLayout) view.findViewById(R.id.tablayout);
tabs.setupWithViewPager(viewPager);
return view;
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
adapter.addFrag(new Messages_Tabs_ChatFragment(), "Чаты");
adapter.addFrag(new Messages_Tabs_CallFragment(), "Звонки");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}Cannot resolve symbol 'addOnPageChangeListener'viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
}app:tabGravity="center" то все-равно отступ останется 
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<scale
android:fromXScale="0.0"
android:fromYScale="0.0"
android:toYScale="0.8"
android:toXScale="0.8"
android:pivotX="50%"
android:pivotY="50%"
android:duration="300"
android:interpolator="@android:anim/linear_interpolator"/>
<alpha
android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="300"
android:interpolator="@android:anim/accelerate_interpolator"/>
</set><set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<scale
android:fromXScale="0.8"
android:fromYScale="0.8"
android:toYScale="0.0"
android:toXScale="0.0"
android:pivotX="50%"
android:pivotY="50%"
android:duration="300"
android:interpolator="@android:anim/linear_interpolator"/>
<alpha
android:fromAlpha="1.0"
android:toAlpha="0.0"
android:duration="300"
android:interpolator="@android:anim/accelerate_interpolator"/>
</set><set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<rotate
android:fromDegrees="45"
android:toDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:duration="300"
android:interpolator="@android:anim/linear_interpolator"/>
</set><set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true">
<rotate
android:fromDegrees="0"
android:toDegrees="45"
android:pivotX="50%"
android:pivotY="50%"
android:duration="300"
android:interpolator="@android:anim/linear_interpolator"/>
</set>