Java tutorial
/* Copyright 2017 Andrew Dawson * * This file is a part of Tusky. * * This program is free software; you can redistribute it and/or modify it under the terms of the * GNU General Public License as published by the Free Software Foundation; either version 3 of the * License, or (at your option) any later version. * * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. * * You should have received a copy of the GNU General Public License along with Tusky; if not, * see <http://www.gnu.org/licenses>. */ package com.fa.mastodon.fragment; import android.content.Context; import android.content.SharedPreferences; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.annotation.Nullable; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.TabLayout; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.DividerItemDecoration; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.fa.mastodon.activity.MainActivity; import com.fa.mastodon.adapter.NotificationsAdapter; import com.keylesspalace.tusky.R; import com.fa.mastodon.entity.Notification; import com.fa.mastodon.entity.Status; import com.fa.mastodon.interfaces.StatusActionListener; import com.fa.mastodon.interfaces.StatusRemoveListener; import com.fa.mastodon.util.EndlessOnScrollListener; import com.fa.mastodon.util.Log; import com.fa.mastodon.util.ThemeUtils; import java.util.List; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; public class NotificationsFragment extends SFragment implements SwipeRefreshLayout.OnRefreshListener, StatusActionListener, StatusRemoveListener, NotificationsAdapter.NotificationActionListener, SharedPreferences.OnSharedPreferenceChangeListener { private static final String TAG = "Notifications"; // logging tag private SwipeRefreshLayout swipeRefreshLayout; private LinearLayoutManager layoutManager; private RecyclerView recyclerView; private EndlessOnScrollListener scrollListener; private NotificationsAdapter adapter; private TabLayout.OnTabSelectedListener onTabSelectedListener; private Call<List<Notification>> listCall; private boolean hideFab; public static NotificationsFragment newInstance() { NotificationsFragment fragment = new NotificationsFragment(); Bundle arguments = new Bundle(); fragment.setArguments(arguments); return fragment; } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_timeline, container, false); // Setup the SwipeRefreshLayout. Context context = getContext(); swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout); swipeRefreshLayout.setOnRefreshListener(this); // Setup the RecyclerView. recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view); recyclerView.setHasFixedSize(true); layoutManager = new LinearLayoutManager(context); recyclerView.setLayoutManager(layoutManager); DividerItemDecoration divider = new DividerItemDecoration(context, layoutManager.getOrientation()); Drawable drawable = ThemeUtils.getDrawable(context, R.attr.status_divider_drawable, R.drawable.status_divider_dark); divider.setDrawable(drawable); //recyclerView.addItemDecoration(divider); adapter = new NotificationsAdapter(this, this); recyclerView.setAdapter(adapter); /*TabLayout layout = (TabLayout) getActivity().findViewById(R.id.tab_layout); onTabSelectedListener = new TabLayout.OnTabSelectedListener() { @Override public void onTabSelected(TabLayout.Tab tab) {} @Override public void onTabUnselected(TabLayout.Tab tab) {} @Override public void onTabReselected(TabLayout.Tab tab) { jumpToTop(); } }; layout.addOnTabSelectedListener(onTabSelectedListener);*/ return rootView; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); /* This is delayed until onActivityCreated solely because MainActivity.composeButton isn't * guaranteed to be set until then. * Use a modified scroll listener that both loads more notifications as it goes, and hides * the compose button on down-scroll. */ MainActivity activity = (MainActivity) getActivity(); final FloatingActionButton composeButton = activity.composeButton; final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(activity); preferences.registerOnSharedPreferenceChangeListener(this); hideFab = preferences.getBoolean("fabHide", false); scrollListener = new EndlessOnScrollListener(layoutManager) { @Override public void onScrolled(RecyclerView view, int dx, int dy) { super.onScrolled(view, dx, dy); if (hideFab) { if (dy > 0 && composeButton.isShown()) { composeButton.hide(); // hides the button if we're scrolling down } else if (dy < 0 && !composeButton.isShown()) { composeButton.show(); // shows it if we are scrolling up } } else if (!composeButton.isShown()) { composeButton.show(); } } @Override public void onLoadMore(int page, int totalItemsCount, RecyclerView view) { NotificationsAdapter adapter = (NotificationsAdapter) view.getAdapter(); Notification notification = adapter.getItem(adapter.getItemCount() - 2); if (notification != null) { sendFetchNotificationsRequest(notification.id, null); } else { sendFetchNotificationsRequest(); } } }; recyclerView.addOnScrollListener(scrollListener); } @Override public void onDestroy() { super.onDestroy(); if (listCall != null) listCall.cancel(); } @Override public void onDestroyView() { /*TabLayout tabLayout = (TabLayout) getActivity().findViewById(R.id.tab_layout); tabLayout.removeOnTabSelectedListener(onTabSelectedListener);*/ super.onDestroyView(); } private void jumpToTop() { layoutManager.scrollToPosition(0); scrollListener.reset(); } private void sendFetchNotificationsRequest(final String fromId, String uptoId) { if (fromId != null || adapter.getItemCount() <= 1) { adapter.setFooterState(NotificationsAdapter.FooterState.LOADING); } listCall = mastodonAPI.notifications(fromId, uptoId, null); listCall.enqueue(new Callback<List<Notification>>() { @Override public void onResponse(Call<List<Notification>> call, Response<List<Notification>> response) { if (response.isSuccessful()) { onFetchNotificationsSuccess(response.body(), fromId); } else { onFetchNotificationsFailure(new Exception(response.message())); } } @Override public void onFailure(Call<List<Notification>> call, Throwable t) { onFetchNotificationsFailure((Exception) t); } }); callList.add(listCall); } private void sendFetchNotificationsRequest() { sendFetchNotificationsRequest(null, null); } public void removePostsByUser(String accountId) { adapter.removeAllByAccountId(accountId); } private static boolean findNotification(List<Notification> notifications, String id) { for (Notification notification : notifications) { if (notification.id.equals(id)) { return true; } } return false; } private void onFetchNotificationsSuccess(List<Notification> notifications, String fromId) { if (fromId != null) { if (notifications.size() > 0 && !findNotification(notifications, fromId)) { adapter.addItems(notifications); // Set last update id for pull notifications so that we don't get notified // about things we already loaded here SharedPreferences preferences = getActivity() .getSharedPreferences(getString(R.string.preferences_file_key), Context.MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); editor.putString("lastUpdateId", notifications.get(0).id); editor.apply(); } } else { adapter.update(notifications); } if (notifications.size() == 0 && adapter.getItemCount() == 1) { adapter.setFooterState(NotificationsAdapter.FooterState.EMPTY); } else if (fromId != null) { adapter.setFooterState(NotificationsAdapter.FooterState.END); } swipeRefreshLayout.setRefreshing(false); } private void onFetchNotificationsFailure(Exception exception) { swipeRefreshLayout.setRefreshing(false); Log.e(TAG, "Fetch failure: " + exception.getMessage()); } public void onRefresh() { Notification notification = adapter.getItem(0); if (notification != null) { sendFetchNotificationsRequest(null, notification.id); } else { sendFetchNotificationsRequest(); } } public void onReply(int position) { Notification notification = adapter.getItem(position); super.reply(notification.status); } public void onReblog(boolean reblog, int position) { Notification notification = adapter.getItem(position); super.reblog(notification.status, reblog, adapter, position); } public void onFavourite(boolean favourite, int position) { Notification notification = adapter.getItem(position); super.favourite(notification.status, favourite, adapter, position); } public void onMore(View view, int position) { Notification notification = adapter.getItem(position); super.more(notification.status, view, adapter, position); } public void onViewMedia(String url, Status.MediaAttachment.Type type) { super.viewMedia(url, type); } public void onViewThread(int position) { Notification notification = adapter.getItem(position); super.viewThread(notification.status); } public void onViewTag(String tag) { super.viewTag(tag); } public void onViewAccount(String id) { super.viewAccount(id); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals("fabHide")) { hideFab = sharedPreferences.getBoolean("fabHide", true); } } }