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Diffstat (limited to 'java/com/android/dialer/contactsfragment/ContactsFragment.java')
-rw-r--r-- | java/com/android/dialer/contactsfragment/ContactsFragment.java | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/java/com/android/dialer/contactsfragment/ContactsFragment.java b/java/com/android/dialer/contactsfragment/ContactsFragment.java new file mode 100644 index 000000000..18220601f --- /dev/null +++ b/java/com/android/dialer/contactsfragment/ContactsFragment.java @@ -0,0 +1,112 @@ +/* + * 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; + +/** 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); + 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); + } + } +} |