| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dialer.contactsfragment; |
| |
| import android.app.Fragment; |
| import android.app.LoaderManager.LoaderCallbacks; |
| import android.content.Loader; |
| import android.database.Cursor; |
| import android.os.Bundle; |
| import android.support.annotation.Nullable; |
| import android.support.v7.widget.LinearLayoutManager; |
| import android.support.v7.widget.RecyclerView; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.View.OnScrollChangeListener; |
| import android.view.ViewGroup; |
| import android.widget.TextView; |
| import com.android.dialer.util.PermissionsUtil; |
| |
| /** Fragment containing a list of all contacts. */ |
| public class ContactsFragment extends Fragment |
| implements LoaderCallbacks<Cursor>, OnScrollChangeListener { |
| |
| private TextView anchoredHeader; |
| private RecyclerView recyclerView; |
| private LinearLayoutManager manager; |
| private ContactsAdapter adapter; |
| |
| @Nullable |
| @Override |
| public View onCreateView( |
| LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { |
| View view = inflater.inflate(R.layout.fragment_contacts, container, false); |
| anchoredHeader = (TextView) view.findViewById(R.id.header); |
| manager = new LinearLayoutManager(getContext()); |
| |
| // TODO: Handle contacts permission denied view |
| // TODO: Handle 0 contacts layout |
| recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view); |
| recyclerView.setLayoutManager(manager); |
| getLoaderManager().initLoader(0, null, this); |
| |
| if (PermissionsUtil.hasContactsReadPermissions(getContext())) { |
| getLoaderManager().initLoader(0, null, this); |
| } |
| |
| return view; |
| } |
| |
| @Override |
| public Loader<Cursor> onCreateLoader(int id, Bundle args) { |
| return new ContactsCursorLoader(getContext()); |
| } |
| |
| @Override |
| public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { |
| // TODO setup fast scroller. |
| adapter = new ContactsAdapter(getContext(), cursor); |
| recyclerView.setAdapter(adapter); |
| if (adapter.getItemCount() > 1) { |
| recyclerView.setOnScrollChangeListener(this); |
| } |
| } |
| |
| @Override |
| public void onLoaderReset(Loader<Cursor> loader) { |
| recyclerView.setAdapter(null); |
| recyclerView.setOnScrollChangeListener(null); |
| adapter = null; |
| } |
| |
| /* |
| * When our recycler view updates, we need to ensure that our row headers and anchored header |
| * are in the correct state. |
| * |
| * The general rule is, when the row headers are shown, our anchored header is hidden. When the |
| * recycler view is scrolling through a sublist that has more than one element, we want to show |
| * out anchored header, to create the illusion that our row header has been anchored. In all |
| * other situations, we want to hide the anchor because that means we are transitioning between |
| * two sublists. |
| */ |
| @Override |
| public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) { |
| int firstVisibleItem = manager.findFirstVisibleItemPosition(); |
| int firstCompletelyVisible = manager.findFirstCompletelyVisibleItemPosition(); |
| |
| // If the user swipes to the top of the list very quickly, there is some strange behavior |
| // between this method updating headers and adapter#onBindViewHolder updating headers. |
| // To overcome this, we refresh the headers to ensure they are correct. |
| if (firstVisibleItem == firstCompletelyVisible && firstVisibleItem == 0) { |
| adapter.refreshHeaders(); |
| anchoredHeader.setVisibility(View.INVISIBLE); |
| } else { |
| boolean showAnchor = |
| adapter.getHeader(firstVisibleItem).equals(adapter.getHeader(firstCompletelyVisible)); |
| anchoredHeader.setText(adapter.getHeader(firstCompletelyVisible)); |
| anchoredHeader.setVisibility(showAnchor ? View.VISIBLE : View.INVISIBLE); |
| |
| int rowHeaderVisibility = showAnchor ? View.INVISIBLE : View.VISIBLE; |
| adapter.setHeaderVisibility(firstVisibleItem, rowHeaderVisibility); |
| adapter.setHeaderVisibility(firstCompletelyVisible, rowHeaderVisibility); |
| } |
| } |
| } |