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.graphics.drawable.Drawable; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.design.widget.Snackbar; import android.support.v4.content.ContextCompat; 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.adapter.ThreadAdapter; import com.fa.mastodon.activity.BaseActivity; import com.fa.mastodon.entity.Status; import com.fa.mastodon.entity.StatusContext; import com.fa.mastodon.network.MastodonAPI; import com.keylesspalace.tusky.R; import com.fa.mastodon.interfaces.StatusActionListener; import com.fa.mastodon.interfaces.StatusRemoveListener; import com.fa.mastodon.util.ConversationLineItemDecoration; import com.fa.mastodon.util.Log; import com.fa.mastodon.util.ThemeUtils; import retrofit2.Call; import retrofit2.Callback; import retrofit2.Response; public class ViewThreadFragment extends SFragment implements SwipeRefreshLayout.OnRefreshListener, StatusActionListener, StatusRemoveListener { private static final String TAG = "ViewThreadFragment"; private SwipeRefreshLayout swipeRefreshLayout; private RecyclerView recyclerView; private ThreadAdapter adapter; private MastodonAPI mastodonApi; private String thisThreadsStatusId; public static ViewThreadFragment newInstance(String id) { Bundle arguments = new Bundle(); ViewThreadFragment fragment = new ViewThreadFragment(); arguments.putString("id", id); 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_view_thread, container, false); Context context = getContext(); swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout); swipeRefreshLayout.setOnRefreshListener(this); recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view); recyclerView.setHasFixedSize(true); LinearLayoutManager 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); recyclerView.addItemDecoration(new ConversationLineItemDecoration(context, ContextCompat.getDrawable(context, R.drawable.conversation_divider_dark))); adapter = new ThreadAdapter(this); recyclerView.setAdapter(adapter); mastodonApi = null; thisThreadsStatusId = null; return rootView; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); /* BaseActivity's MastodonAPI object isn't guaranteed to be valid until after its onCreate * is run, so all calls that need it can't be done until here. */ mastodonApi = ((BaseActivity) getActivity()).mastodonAPI; thisThreadsStatusId = getArguments().getString("id"); onRefresh(); } private void sendStatusRequest(final String id) { Call<Status> call = mastodonApi.status(id); call.enqueue(new Callback<Status>() { @Override public void onResponse(Call<Status> call, Response<Status> response) { if (response.isSuccessful()) { int position = adapter.setStatus(response.body()); recyclerView.scrollToPosition(position); } else { onThreadRequestFailure(id); } } @Override public void onFailure(Call<Status> call, Throwable t) { onThreadRequestFailure(id); } }); callList.add(call); } private void sendThreadRequest(final String id) { Call<StatusContext> call = mastodonApi.statusContext(id); call.enqueue(new Callback<StatusContext>() { @Override public void onResponse(Call<StatusContext> call, Response<StatusContext> response) { if (response.isSuccessful()) { swipeRefreshLayout.setRefreshing(false); StatusContext context = response.body(); adapter.setContext(context.ancestors, context.descendants); } else { onThreadRequestFailure(id); } } @Override public void onFailure(Call<StatusContext> call, Throwable t) { onThreadRequestFailure(id); } }); callList.add(call); } private void onThreadRequestFailure(final String id) { View view = getView(); swipeRefreshLayout.setRefreshing(false); if (view != null) { Snackbar.make(view, R.string.error_generic, Snackbar.LENGTH_LONG) .setAction(R.string.action_retry, new View.OnClickListener() { @Override public void onClick(View v) { sendThreadRequest(id); sendStatusRequest(id); } }).show(); } else { Log.e(TAG, "Couldn't display thread fetch error message"); } } @Override public void removePostsByUser(String accountId) { adapter.removeAllByAccountId(accountId); } public void onRefresh() { sendStatusRequest(thisThreadsStatusId); sendThreadRequest(thisThreadsStatusId); } @Override public void onSuccessfulStatus() { onRefresh(); super.onSuccessfulStatus(); } public void onReply(int position) { super.reply(adapter.getItem(position)); } public void onReblog(boolean reblog, int position) { super.reblog(adapter.getItem(position), reblog, adapter, position); } public void onFavourite(boolean favourite, int position) { super.favourite(adapter.getItem(position), favourite, adapter, position); } public void onMore(View view, 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) { Status status = adapter.getItem(position); if (thisThreadsStatusId.equals(status.id)) { // If already viewing this thread, don't reopen it. return; } super.viewThread(status); } public void onViewTag(String tag) { super.viewTag(tag); } public void onViewAccount(String id) { super.viewAccount(id); } }