68 lines
2.6 KiB
Java
68 lines
2.6 KiB
Java
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.dialer.app.contactinfo;
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import android.support.v4.app.Fragment;
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import android.support.v4.app.FragmentManager;
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import android.support.v7.app.AppCompatActivity;
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import com.android.dialer.phonenumbercache.ContactInfo;
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import com.android.dialer.util.ExpirableCache;
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/**
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* Fragment without any UI whose purpose is to retain an instance of {@link ExpirableCache} across
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* configuration change through the use of {@link #setRetainInstance(boolean)}. This is done as
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* opposed to implementing {@link android.os.Parcelable} as it is a less widespread change.
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*/
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public class ExpirableCacheHeadlessFragment extends Fragment {
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private static final String FRAGMENT_TAG = "ExpirableCacheHeadlessFragment";
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private static final int CONTACT_INFO_CACHE_SIZE = 100;
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private ExpirableCache<NumberWithCountryIso, ContactInfo> retainedCache;
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@NonNull
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public static ExpirableCacheHeadlessFragment attach(@NonNull AppCompatActivity parentActivity) {
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return attach(parentActivity.getSupportFragmentManager());
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}
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@NonNull
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private static ExpirableCacheHeadlessFragment attach(FragmentManager fragmentManager) {
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ExpirableCacheHeadlessFragment fragment =
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(ExpirableCacheHeadlessFragment) fragmentManager.findFragmentByTag(FRAGMENT_TAG);
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if (fragment == null) {
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fragment = new ExpirableCacheHeadlessFragment();
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// Allowing state loss since in rare cases this is called after activity's state is saved and
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// it's fine if the cache is lost.
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fragmentManager.beginTransaction().add(fragment, FRAGMENT_TAG).commitNowAllowingStateLoss();
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}
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return fragment;
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}
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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retainedCache = ExpirableCache.create(CONTACT_INFO_CACHE_SIZE);
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setRetainInstance(true);
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}
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public ExpirableCache<NumberWithCountryIso, ContactInfo> getRetainedCache() {
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return retainedCache;
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}
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}
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