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.content.LocalBroadcastManager; 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.arlib.floatingsearchview.FloatingSearchView; import com.fa.mastodon.activity.MainActivity; import com.keylesspalace.tusky.R; import com.fa.mastodon.adapter.TimelineAdapter; 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.TimelineReceiver; import com.fa.mastodon.util.ThemeUtils; import java.util.Iterator; import java.util.List; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; public class TimelineFragment extends SFragment implements SwipeRefreshLayout.OnRefreshListener, StatusActionListener, StatusRemoveListener, SharedPreferences.OnSharedPreferenceChangeListener { private static final String TAG = "Timeline"; // logging tag public enum Kind { HOME, PUBLIC_LOCAL, PUBLIC_FEDERATED, TAG, USER, FAVOURITES } private SwipeRefreshLayout swipeRefreshLayout; private TimelineAdapter adapter; private Kind kind; private String hashtagOrId; private RecyclerView recyclerView; private LinearLayoutManager layoutManager; private EndlessOnScrollListener scrollListener; private TabLayout.OnTabSelectedListener onTabSelectedListener; private SharedPreferences preferences; private boolean filterRemoveReplies; private boolean filterRemoveReblogs; private boolean hideFab; private TimelineReceiver timelineReceiver; public static TimelineFragment newInstance(Kind kind) { TimelineFragment fragment = new TimelineFragment(); Bundle arguments = new Bundle(); arguments.putString("kind", kind.name()); fragment.setArguments(arguments); return fragment; } public static TimelineFragment newInstance(Kind kind, String hashtagOrId) { TimelineFragment fragment = new TimelineFragment(); Bundle arguments = new Bundle(); arguments.putString("kind", kind.name()); arguments.putString("hashtag_or_id", hashtagOrId); fragment.setArguments(arguments); return fragment; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Bundle arguments = getArguments(); kind = Kind.valueOf(arguments.getString("kind")); if (kind == Kind.TAG || kind == Kind.USER) { hashtagOrId = arguments.getString("hashtag_or_id"); } final 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 TimelineAdapter(this); recyclerView.setAdapter(adapter); if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean("stories", false)) { LinearLayoutManager layoutManager = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false); recyclerView.setLayoutManager(layoutManager); recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); if (recyclerView.getAdapter().getItemCount() != 0) { int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()) .findLastCompletelyVisibleItemPosition(); if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1) onLoadMore(recyclerView); } } }); } timelineReceiver = new TimelineReceiver(adapter); LocalBroadcastManager.getInstance(context.getApplicationContext()).registerReceiver(timelineReceiver, TimelineReceiver.getFilter(kind)); return rootView; } private void onLoadMore(RecyclerView view) { TimelineAdapter adapter = (TimelineAdapter) view.getAdapter(); Status status = adapter.getItem(adapter.getItemCount() - 2); if (status != null) { sendFetchTimelineRequest(status.id, null); } else { sendFetchTimelineRequest(null, null); } } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); /*if (jumpToTopAllowed()) { 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); }*/ /* This is delayed until onActivityCreated solely because MainActivity.composeButton isn't * guaranteed to be set until then. */ if (composeButtonPresent()) { /* Use a modified scroll listener that both loads more statuses as it goes, and hides * the follow 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", true); 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) { TimelineFragment.this.onLoadMore(view); } }; } else { // Just use the basic scroll listener to load more statuses. scrollListener = new EndlessOnScrollListener(layoutManager) { @Override public void onLoadMore(int page, int totalItemsCount, RecyclerView view) { TimelineFragment.this.onLoadMore(view); } }; } recyclerView.addOnScrollListener(scrollListener); Status status = adapter.getItem(0); if (status != null) { sendFetchTimelineRequest(null, status.id); } else { sendFetchTimelineRequest(null, null); } preferences = PreferenceManager.getDefaultSharedPreferences(getActivity()); } @Override public void onDestroyView() { /*if (jumpToTopAllowed()) { TabLayout tabLayout = (TabLayout) getActivity().findViewById(R.id.tab_layout); tabLayout.removeOnTabSelectedListener(onTabSelectedListener); }*/ LocalBroadcastManager.getInstance(getContext()).unregisterReceiver(timelineReceiver); super.onDestroyView(); } private boolean jumpToTopAllowed() { return kind != Kind.TAG && kind != Kind.FAVOURITES; } private boolean composeButtonPresent() { return kind != Kind.TAG && kind != Kind.FAVOURITES && kind != Kind.USER; } private void jumpToTop() { layoutManager.scrollToPosition(0); scrollListener.reset(); } private void sendFetchTimelineRequest(@Nullable final String fromId, @Nullable String uptoId) { if (fromId != null || adapter.getItemCount() <= 1) { adapter.setFooterState(TimelineAdapter.FooterState.LOADING); } Callback<List<Status>> callback = new Callback<List<Status>>() { @Override public void onResponse(Call<List<Status>> call, Response<List<Status>> response) { if (response.isSuccessful()) { onFetchTimelineSuccess(response.body(), fromId); } else { onFetchTimelineFailure(new Exception(response.message())); } } @Override public void onFailure(Call<List<Status>> call, Throwable t) { onFetchTimelineFailure((Exception) t); } }; Call<List<Status>> listCall; switch (kind) { default: case HOME: { listCall = mastodonAPI.homeTimeline(fromId, uptoId, null); break; } case PUBLIC_FEDERATED: { listCall = mastodonAPI.publicTimeline(null, fromId, uptoId, null); break; } case PUBLIC_LOCAL: { listCall = mastodonAPI.publicTimeline(true, fromId, uptoId, null); break; } case TAG: { listCall = mastodonAPI.hashtagTimeline(hashtagOrId, null, fromId, uptoId, null); break; } case USER: { listCall = mastodonAPI.accountStatuses(hashtagOrId, fromId, uptoId, null); break; } case FAVOURITES: { listCall = mastodonAPI.favourites(fromId, uptoId, null); break; } } callList.add(listCall); listCall.enqueue(callback); } public void removePostsByUser(String accountId) { adapter.removeAllByAccountId(accountId); } private static boolean findStatus(List<Status> statuses, String id) { for (Status status : statuses) { if (status.id.equals(id)) { return true; } } return false; } protected void filterStatuses(List<Status> statuses) { Iterator<Status> it = statuses.iterator(); while (it.hasNext()) { Status status = it.next(); if ((status.inReplyToId != null && filterRemoveReplies) || (status.reblog != null && filterRemoveReblogs)) { it.remove(); } } } protected void setFiltersFromSettings() { boolean oldRemoveReplies = filterRemoveReplies; boolean oldRemoveReblogs = filterRemoveReblogs; filterRemoveReplies = (kind == Kind.HOME && !preferences.getBoolean("tabFilterHomeReplies", true)); filterRemoveReblogs = (kind == Kind.HOME && !preferences.getBoolean("tabFilterHomeBoosts", true)); if (adapter.getItemCount() > 1 && (oldRemoveReblogs != filterRemoveReblogs || oldRemoveReplies != filterRemoveReplies)) { adapter.clear(); sendFetchTimelineRequest(null, null); } } @Override public void onResume() { super.onResume(); setFiltersFromSettings(); } public void onFetchTimelineSuccess(List<Status> statuses, String fromId) { filterStatuses(statuses); if (fromId != null) { if (statuses.size() > 0 && !findStatus(statuses, fromId)) { adapter.addItems(statuses); } } else { adapter.update(statuses); } if (statuses.size() == 0 && adapter.getItemCount() == 1) { adapter.setFooterState(TimelineAdapter.FooterState.EMPTY); } else if (fromId != null) { adapter.setFooterState(TimelineAdapter.FooterState.END); } swipeRefreshLayout.setRefreshing(false); } public void onFetchTimelineFailure(Exception exception) { swipeRefreshLayout.setRefreshing(false); Log.e(TAG, "Fetch Failure: " + exception.getMessage()); } public void onRefresh() { Status status = adapter.getItem(0); if (status != null) { sendFetchTimelineRequest(null, status.id); } else { sendFetchTimelineRequest(null, null); } } @Override public void onSuccessfulStatus() { if (kind == Kind.HOME || kind == Kind.PUBLIC_FEDERATED || kind == Kind.PUBLIC_LOCAL) { onRefresh(); } super.onSuccessfulStatus(); } public void onReply(int position) { super.reply(adapter.getItem(position)); } public void onReblog(final boolean reblog, final int position) { super.reblog(adapter.getItem(position), reblog, adapter, position); } public void onFavourite(final boolean favourite, final int position) { super.favourite(adapter.getItem(position), favourite, adapter, position); } public void onMore(View view, final int position) { super.more(adapter.getItem(position), view, adapter, position); } public void onViewMedia(String url, Status.MediaAttachment.Type type) { super.viewMedia(url, type); } public void onViewThread(int position) { super.viewThread(adapter.getItem(position)); } public void onViewTag(String tag) { if (kind == Kind.TAG && hashtagOrId.equals(tag)) { // If already viewing a tag page, then ignore any request to view that tag again. return; } super.viewTag(tag); } public void onViewAccount(String id) { if (kind == Kind.USER && hashtagOrId.equals(id)) { /* If already viewing an account page, then any requests to view that account page * should be ignored. */ return; } super.viewAccount(id); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { if (key.equals("fabHide")) { hideFab = sharedPreferences.getBoolean("fabHide", false); } } }