Differential D17859 Diff 48788 src/org/kde/kdeconnect/UserInterface/DeviceSettingsFragment.java

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src/org/kde/kdeconnect/UserInterface/DeviceSettingsFragment.java

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1​/*
2​ * Copyright 2018 Erik Duisters <e.duisters1@gmail.com>
3​ *
4​ * This program is free software; you can redistribute it and/or
5​ * modify it under the terms of the GNU General Public License as
6​ * published by the Free Software Foundation; either version 2 of
7​ * the License or (at your option) version 3 or any later version
8​ * accepted by the membership of KDE e.V. (or its successor approved
9​ * by the membership of KDE e.V.), which shall act as a proxy
10​ * defined in Section 14 of version 3 of the license.
11​ *
12​ * This program is distributed in the hope that it will be useful,
13​ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14​ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15​ * GNU General Public License for more details.
16​ *
17​ * You should have received a copy of the GNU General Public License
18​ * along with this program. If not, see <http://www.gnu.org/licenses/>.
19​ */
20​
21​package org.kde.kdeconnect.UserInterface;
22​
23​import android.os.Bundle;
24​import android.os.Parcelable;
25​
26​import org.kde.kdeconnect.BackgroundService;
27​import org.kde.kdeconnect.Device;
28​import org.kde.kdeconnect_tp.R;
29​
30​import java.util.List;
31​
32​import androidx.annotation.NonNull;
33​import androidx.fragment.app.FragmentActivity;
34​import androidx.preference.PreferenceFragmentCompat;
35​import androidx.preference.PreferenceScreen;
36​import androidx.recyclerview.widget.RecyclerView;
37​
38​public class DeviceSettingsFragment extends PreferenceFragmentCompat {
39​ private static final String ARG_DEVICE_ID = "deviceId";
40​ private static final String KEY_RECYCLERVIEW_LAYOUTMANAGER_STATE = "RecyclerViewLayoutmanagerState";
41​
42​ private PluginPreference.PluginPreferenceCallback callback;
43​ private Parcelable recyclerViewLayoutManagerState;
44​
45​ /*
46​ https://bricolsoftconsulting.com/state-preservation-in-backstack-fragments/
47​ When adding a fragment to the backstack the fragments onDestroyView is called (which releases
48​ the RecyclerView) but the fragments onSaveInstanceState is not called. When the fragment is destroyed later
49​ on, its onSaveInstanceState() is called but I don't have access to the RecyclerView or it's LayoutManager any more
50​ */
51​ private boolean stateSaved;
52​
53​ public static DeviceSettingsFragment newInstance(@NonNull String deviceId) {
54​ DeviceSettingsFragment fragment = new DeviceSettingsFragment();
55​
56​ Bundle args = new Bundle();
57​ args.putString(ARG_DEVICE_ID, deviceId);
58​ fragment.setArguments(args);
59​
60​ return fragment;
61​ }
62​
63​ @Override
64​ public void onCreate(Bundle savedInstanceState) {
65​ if (requireActivity() instanceof PluginPreference.PluginPreferenceCallback) {
66​ callback = (PluginPreference.PluginPreferenceCallback) getActivity();
67​ } else {
68​ throw new RuntimeException(requireActivity().getClass().getSimpleName()
69​ + " must implement PluginPreference.PluginPreferenceCallback");
70​ }
71​
72​ super.onCreate(savedInstanceState);
73​
74​ if (savedInstanceState != null && savedInstanceState.containsKey(KEY_RECYCLERVIEW_LAYOUTMANAGER_STATE)) {
75​ recyclerViewLayoutManagerState = savedInstanceState.getParcelable(KEY_RECYCLERVIEW_LAYOUTMANAGER_STATE);
76​ }
77​ }
78​
79​ @Override
80​ public void onDestroy() {
81​ super.onDestroy();
82​
83​ callback = null;
84​ }
85​
86​ @Override
87​ public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
88​ PreferenceScreen preferenceScreen = getPreferenceManager().createPreferenceScreen(requireContext());
89​ setPreferenceScreen(preferenceScreen);
90​
91​ final String deviceId = getArguments().getString(ARG_DEVICE_ID);
92​
93​ BackgroundService.RunCommand(requireContext(), service -> {
94​ final Device device = service.getDevice(deviceId);
95​ if (device == null) {
96​ final FragmentActivity activity = requireActivity();
97​ activity.runOnUiThread(() -> activity.finish());
98​ return;
99​ }
100​ List<String> plugins = device.getSupportedPlugins();
101​
102​ for (final String pluginKey : plugins) {
103​ PluginPreference pref = new PluginPreference(requireContext(), pluginKey, device, callback);
104​ preferenceScreen.addPreference(pref);
105​ }
106​ });
107​ }
108​
109​ @Override
110​ protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
111​ RecyclerView.Adapter adapter = super.onCreateAdapter(preferenceScreen);
112​
113​ /*
114​ The layoutmanager's state (e.g. scroll position) can only be restored when the recyclerView's
115​ adapter has been re-populated with data.
116​ */
117​ if (recyclerViewLayoutManagerState != null) {
118​ adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
119​ @Override
120​ public void onChanged() {
121​ RecyclerView.LayoutManager layoutManager = getListView().getLayoutManager();
122​
123​ if (layoutManager != null) {
124​ layoutManager.onRestoreInstanceState(recyclerViewLayoutManagerState);
125​ }
126​
127​ recyclerViewLayoutManagerState = null;
128​ adapter.unregisterAdapterDataObserver(this);
129​ }
130​ });
131​ }
132​
133​ return adapter;
134​ }
135​
136​ @Override
137​ public void onPause() {
138​ super.onPause();
139​
140​ stateSaved = false;
141​ }
142​
143​ @Override
144​ public void onResume() {
145​ super.onResume();
146​
147​ requireActivity().setTitle(getString(R.string.device_menu_plugins));
148​ }
149​
150​ @Override
151​ public void onDestroyView() {
152​ if (!stateSaved && getListView() != null && getListView().getLayoutManager() != null) {
153​ recyclerViewLayoutManagerState = getListView().getLayoutManager().onSaveInstanceState();
154​ }
155​
156​ super.onDestroyView();
157​ }
158​
159​ @Override
160​ public void onSaveInstanceState(Bundle outState) {
161​ super.onSaveInstanceState(outState);
162​
163​ Parcelable layoutManagerState = recyclerViewLayoutManagerState;
164​
165​ if (getListView() != null && getListView().getLayoutManager() != null) {
166​ layoutManagerState = getListView().getLayoutManager().onSaveInstanceState();
167​ }
168​
169​ if (layoutManagerState != null) {
170​ outState.putParcelable(KEY_RECYCLERVIEW_LAYOUTMANAGER_STATE, layoutManagerState);
171​ }
172​
173​ stateSaved = true;
174​ }
175​}