Java tutorial
/* * Copyright (C) 2015 Andriy Druk * * 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.druk.servicebrowser.ui.fragment; import com.druk.servicebrowser.BonjourApplication; import com.druk.servicebrowser.R; import com.druk.servicebrowser.ui.adapter.ServiceAdapter; import com.github.druk.rxdnssd.BonjourService; import com.github.druk.rxdnssd.RxDnssd; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.content.Context; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.AccelerateDecelerateInterpolator; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.ProgressBar; import rx.Subscription; import rx.android.schedulers.AndroidSchedulers; import rx.functions.Action1; import rx.schedulers.Schedulers; public class ServiceBrowserFragment<T> extends Fragment { private static final String KEY_REG_TYPE = "reg_type"; private static final String KEY_DOMAIN = "domain"; private static final String KEY_SELECTED_POSITION = "selected_position"; protected Subscription mSubscription; protected ServiceAdapter mAdapter; protected String mReqType; protected String mDomain; protected RecyclerView mRecyclerView; protected ProgressBar mProgressView; protected LinearLayout mErrorView; protected RxDnssd mRxDnssd; protected View.OnClickListener mListener = new View.OnClickListener() { @Override public void onClick(View v) { int position = mRecyclerView.getLayoutManager().getPosition(v); mAdapter.setSelectedItemId(mAdapter.getItemId(position)); mAdapter.notifyDataSetChanged(); if (ServiceBrowserFragment.this.isAdded()) { BonjourService service = mAdapter.getItem(position); ((ServiceListener) ServiceBrowserFragment.this.getActivity()).onServiceWasSelected(mDomain, mReqType, service); } } }; public static Fragment newInstance(String domain, String regType) { return fillArguments(new ServiceBrowserFragment(), domain, regType); } protected static Fragment fillArguments(Fragment fragment, String domain, String regType) { Bundle bundle = new Bundle(); bundle.putString(KEY_DOMAIN, domain); bundle.putString(KEY_REG_TYPE, regType); fragment.setArguments(bundle); return fragment; } @Override public void onAttach(Context context) { super.onAttach(context); if (!(context instanceof ServiceListener)) { throw new IllegalArgumentException("Fragment context should implement ServiceListener interface"); } mRxDnssd = BonjourApplication.getRxDnssd(context); } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mReqType = getArguments().getString(KEY_REG_TYPE); mDomain = getArguments().getString(KEY_DOMAIN); } mAdapter = new ServiceAdapter(getActivity()) { @Override public void onBindViewHolder(ViewHolder viewHolder, int i) { BonjourService service = getItem(i); viewHolder.text1.setText(service.getServiceName()); if (service.getInet4Address() != null) { viewHolder.text2.setText(service.getInet4Address().getHostAddress()); } else if (service.getInet6Address() != null) { viewHolder.text2.setText(service.getInet6Address().getHostAddress()); } else { viewHolder.text2.setText(R.string.not_resolved_yet); } viewHolder.itemView.setOnClickListener(mListener); viewHolder.itemView.setBackgroundResource(getBackground(i)); } }; } @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { FrameLayout rootView = (FrameLayout) inflater.inflate(R.layout.fragment_service_browser, container, false); mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view); mProgressView = (ProgressBar) rootView.findViewById(R.id.progress); mErrorView = (LinearLayout) rootView.findViewById(R.id.error_container); mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext())); mRecyclerView.setHasFixedSize(true); mRecyclerView.setAdapter(mAdapter); if (savedInstanceState != null) { mAdapter.setSelectedItemId(savedInstanceState.getLong(KEY_SELECTED_POSITION, -1L)); } return rootView; } @Override public void onResume() { super.onResume(); startDiscovery(); } @Override public void onPause() { super.onPause(); stopDiscovery(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putLong(KEY_SELECTED_POSITION, mAdapter.getSelectedItemId()); } protected void startDiscovery() { mSubscription = mRxDnssd.browse(mReqType, mDomain).compose(mRxDnssd.resolve()) .compose(mRxDnssd.queryRecords()).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()).subscribe(new Action1<BonjourService>() { @Override public void call(BonjourService bonjourService) { int itemsCount = mAdapter.getItemCount(); if (!bonjourService.isLost()) { mAdapter.add(bonjourService); } else { mAdapter.remove(bonjourService); } ServiceBrowserFragment.this.showList(itemsCount); mAdapter.notifyDataSetChanged(); } }, new Action1<Throwable>() { @Override public void call(Throwable throwable) { Log.e("DNSSD", "Error: ", throwable); ServiceBrowserFragment.this.showError(throwable); } }); } protected boolean showList(int itemsBefore) { if (itemsBefore > 0 && mAdapter.getItemCount() == 0) { mRecyclerView.animate().alpha(0.0f).setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mRecyclerView.setVisibility(View.GONE); } }).start(); mProgressView.setAlpha(0.0f); mProgressView.setVisibility(View.VISIBLE); mProgressView.animate().alpha(1.0f).setInterpolator(new AccelerateDecelerateInterpolator()).start(); return true; } if (itemsBefore == 0 && mAdapter.getItemCount() > 0) { mProgressView.animate().alpha(0.0f).setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mProgressView.setVisibility(View.GONE); } }).start(); mRecyclerView.setAlpha(0.0f); mRecyclerView.setVisibility(View.VISIBLE); mRecyclerView.animate().alpha(1.0f).setInterpolator(new AccelerateDecelerateInterpolator()).start(); return false; } return mAdapter.getItemCount() > 0; } protected void showError(final Throwable e) { getActivity().runOnUiThread(new Runnable() { @Override public void run() { mRecyclerView.animate().alpha(0.0f).setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mRecyclerView.setVisibility(View.GONE); } }).start(); mProgressView.animate().alpha(0.0f).setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mProgressView.setVisibility(View.GONE); } }).start(); mErrorView.setAlpha(0.0f); mErrorView.setVisibility(View.VISIBLE); mErrorView.animate().alpha(1.0f).setInterpolator(new AccelerateDecelerateInterpolator()).start(); mErrorView.findViewById(R.id.send_report).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Thread.getDefaultUncaughtExceptionHandler().uncaughtException(Thread.currentThread(), e); } }); } }); } protected void stopDiscovery() { if (mSubscription != null) { mSubscription.unsubscribe(); } } public interface ServiceListener { void onServiceWasSelected(String domain, String regType, BonjourService service); } }