Java tutorial
/* * Copyright (C) 2015 Jacek Marchwicki <jacek.marchwicki@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License */ package com.appunite.socket; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import com.appunite.websocket.rx.RxWebSockets; import com.appunite.websocket.rx.object.GsonObjectSerializer; import com.appunite.websocket.rx.object.RxObjectWebSockets; import com.example.Socket; import com.example.SocketConnection; import com.example.SocketConnectionImpl; import com.example.model.Message; import com.example.model.MessageType; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import okhttp3.OkHttpClient; import okhttp3.Request; import rx.android.schedulers.AndroidSchedulers; import rx.android.view.ViewActions; import rx.android.view.ViewObservable; import rx.functions.Action1; import rx.schedulers.Schedulers; import rx.subjects.BehaviorSubject; import rx.subscriptions.CompositeSubscription; public class MainActivity extends FragmentActivity { private static final String RETENTION_FRAGMENT_TAG = "retention_fragment_tag"; private CompositeSubscription subs; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final MainPresenter presenter = getRetentionFragment(savedInstanceState).presenter(); setContentView(R.layout.main_activity); final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.main_activity_recycler_view); final LinearLayoutManager layout = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false); recyclerView.setLayoutManager(layout); final MainAdapter adapter = new MainAdapter(); recyclerView.setAdapter(adapter); recyclerView.setItemAnimator(new DefaultItemAnimator()); final BehaviorSubject<Boolean> isLastSubject = BehaviorSubject.create(true); recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() { boolean manualScrolling = false; @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { if (newState == RecyclerView.SCROLL_STATE_DRAGGING) { manualScrolling = true; } if (manualScrolling && newState == RecyclerView.SCROLL_STATE_IDLE) { manualScrolling = false; final int lastVisibleItemPosition = layout.findLastVisibleItemPosition(); final int previousItemsCount = adapter.getItemCount(); final boolean isLast = previousItemsCount - 1 == lastVisibleItemPosition; isLastSubject.onNext(isLast); } } }); subs = new CompositeSubscription(isLastSubject.subscribe(presenter.lastItemInViewObserver()), presenter.itemsWithScrollObservable().subscribe(new Action1<MainPresenter.ItemsWithScroll>() { @Override public void call(final MainPresenter.ItemsWithScroll itemsWithScroll) { adapter.call(itemsWithScroll.items()); if (itemsWithScroll.shouldScroll()) { recyclerView.post(new Runnable() { @Override public void run() { recyclerView.smoothScrollToPosition(itemsWithScroll.scrollToPosition()); } }); } } }), presenter.connectButtonEnabledObservable() .subscribe(ViewActions.setEnabled(findViewById(R.id.main_activity_connect_button))), presenter.disconnectButtonEnabledObservable() .subscribe(ViewActions.setEnabled(findViewById(R.id.macin_activity_disconnect_button))), presenter.sendButtonEnabledObservable() .subscribe(ViewActions.setEnabled(findViewById(R.id.main_activity_send_button))), ViewObservable.clicks(findViewById(R.id.main_activity_connect_button)) .subscribe(presenter.connectClickObserver()), ViewObservable.clicks(findViewById(R.id.macin_activity_disconnect_button)) .subscribe(presenter.disconnectClickObserver()), ViewObservable.clicks(findViewById(R.id.main_activity_send_button)) .subscribe(presenter.sendClickObserver())); } private RetentionFragment getRetentionFragment(Bundle savedInstanceState) { if (savedInstanceState == null) { final RetentionFragment retentionFragment = new RetentionFragment(); getSupportFragmentManager().beginTransaction().add(retentionFragment, RETENTION_FRAGMENT_TAG).commit(); return retentionFragment; } else { return (RetentionFragment) getSupportFragmentManager().findFragmentByTag(RETENTION_FRAGMENT_TAG); } } @Override protected void onDestroy() { super.onDestroy(); subs.unsubscribe(); } public static class RetentionFragment extends Fragment { private final MainPresenter presenter; public RetentionFragment() { final Gson gson = new GsonBuilder().registerTypeAdapter(Message.class, new Message.Deserializer()) .registerTypeAdapter(MessageType.class, new MessageType.SerializerDeserializer()).create(); final OkHttpClient okHttpClient = new OkHttpClient(); final RxWebSockets webSockets = new RxWebSockets(okHttpClient, new Request.Builder().get() .url("ws://coreos2.appunite.net:8080/ws").addHeader("Sec-WebSocket-Protocol", "chat").build()); final GsonObjectSerializer serializer = new GsonObjectSerializer(gson, Message.class); final RxObjectWebSockets jsonWebSockets = new RxObjectWebSockets(webSockets, serializer); final SocketConnection socketConnection = new SocketConnectionImpl(jsonWebSockets, Schedulers.io()); presenter = new MainPresenter(new Socket(socketConnection, Schedulers.io()), Schedulers.io(), AndroidSchedulers.mainThread()); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } public MainPresenter presenter() { return presenter; } } }