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/*
* 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);
}
}
}
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