Java tutorial
/* * Copyright (c) 2016 IRCCloud, Ltd. * * 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.irccloud.android.fragment; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.databinding.DataBindingUtil; import android.os.Bundle; import android.support.v4.app.DialogFragment; import android.support.v7.app.AlertDialog; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.TextView; import com.fasterxml.jackson.databind.JsonNode; import com.irccloud.android.IRCCloudJSONObject; import com.irccloud.android.NetworkConnection; import com.irccloud.android.R; import com.irccloud.android.databinding.RowWhowasBinding; import org.solovyev.android.views.llm.LinearLayoutManager; public class WhoWasFragment extends DialogFragment { JsonNode data; IRCCloudJSONObject event; Adapter adapter; NetworkConnection conn; RecyclerView recyclerView; TextView empty; String title; private class ViewHolder extends RecyclerView.ViewHolder { public RowWhowasBinding binding; public ViewHolder(View v) { super(v); binding = DataBindingUtil.bind(v); } } private class Adapter extends RecyclerView.Adapter<ViewHolder> { @Override public int getItemCount() { if (data.size() == 1 && data.get(0).has("no_such_nick")) return 0; else return data.size(); } @Override public long getItemId(int pos) { return pos; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = RowWhowasBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false).getRoot(); return new ViewHolder(v); } @Override public void onBindViewHolder(ViewHolder holder, final int position) { RowWhowasBinding row = holder.binding; JsonNode node = data.get(position); row.setNick(node.get("nick").asText()); if (node.has("user") && node.has("host")) { row.setUsermask(node.get("user").asText() + "@" + node.get("host").asText()); } else { row.usermaskHeading.setVisibility(View.GONE); row.usermask.setVisibility(View.GONE); } row.setRealname(node.get("realname").asText()); if (node.get("last_seen") != null) row.setLastconnected(node.get("last_seen").asText()); else row.setLastconnected(""); row.setConnectedvia(node.get("ircserver").asText()); if (node.has("connecting_from")) { row.setInfo(node.get("connecting_from").asText()); } else { row.infoHeading.setVisibility(View.GONE); row.info.setVisibility(View.GONE); } if (node.has("actual_host")) { row.setActualhost(node.get("actual_host").asText()); } else { row.actualhostHeading.setVisibility(View.GONE); row.actualhost.setVisibility(View.GONE); } row.executePendingBindings(); } } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { Context ctx = getActivity(); if (ctx == null) return null; LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View v = inflater.inflate(R.layout.recyclerview, null); recyclerView = v.findViewById(R.id.recycler); recyclerView.setLayoutManager(new LinearLayoutManager(v.getContext())); empty = v.findViewById(android.R.id.empty); empty.setText("There was no such nickname"); if (savedInstanceState != null && savedInstanceState.containsKey("event")) { event = new IRCCloudJSONObject(savedInstanceState.getString("event")); title = savedInstanceState.getString("title"); data = event.getJsonNode("lines"); adapter = new Adapter(); recyclerView.setAdapter(adapter); if (adapter.getItemCount() > 0) { empty.setVisibility(View.GONE); recyclerView.setVisibility(View.VISIBLE); } else { empty.setVisibility(View.VISIBLE); recyclerView.setVisibility(View.GONE); } } AlertDialog.Builder b = new AlertDialog.Builder(ctx).setTitle(title).setView(v).setNegativeButton("Close", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); AlertDialog d = b.create(); d.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE); return d; } @Override public void onSaveInstanceState(Bundle state) { state.putString("event", event.toString()); state.putString("title", title); } @Override public void setArguments(Bundle args) { event = new IRCCloudJSONObject(args.getString("event")); title = args.getString("title"); data = event.getJsonNode("lines"); if (getActivity() != null && recyclerView != null) { getActivity().runOnUiThread(new Runnable() { @Override public void run() { if (adapter == null) { adapter = new Adapter(); recyclerView.setAdapter(adapter); } else { adapter.notifyDataSetChanged(); } if (adapter.getItemCount() > 0) { empty.setVisibility(View.GONE); recyclerView.setVisibility(View.VISIBLE); } else { empty.setVisibility(View.VISIBLE); recyclerView.setVisibility(View.GONE); } } }); } } @Override public void onResume() { super.onResume(); adapter = new Adapter(); recyclerView.setAdapter(adapter); if (adapter.getItemCount() > 0) { empty.setVisibility(View.GONE); recyclerView.setVisibility(View.VISIBLE); } else { empty.setVisibility(View.VISIBLE); recyclerView.setVisibility(View.GONE); } } }