Java tutorial
/* Copyright 2015 Google Inc. All Rights Reserved. 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.google.android.gcm.demo.ui; import android.content.Intent; import android.graphics.Typeface; import android.os.Bundle; import android.support.v4.util.SimpleArrayMap; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import com.google.android.gcm.demo.R; import com.google.android.gcm.demo.logic.PubSubHelper; import com.google.android.gcm.demo.model.Sender; import com.google.android.gcm.demo.model.SenderCollection; import com.google.android.gcm.demo.model.Token; import com.google.android.gcm.demo.service.LoggingService; import com.google.android.gcm.demo.ui.addressbook.SelectActivity; import java.util.Map; /** * This fragment shows a list of subscribed topics, allowing subscribing to new ones or * un-subscribing from the ones displayed. */ public class TopicsFragment extends AbstractFragment implements View.OnClickListener, MainActivity.RefreshableFragment { private static final String ACTION_UNSUBSCRIBE = "actionUnsubscribe"; private PubSubHelper mPubSubHelper; private LoggingService.Logger mLogger; private SenderCollection mSenders; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) { mLogger = new LoggingService.Logger(getActivity()); mPubSubHelper = new PubSubHelper(getActivity()); mSenders = SenderCollection.getInstance(getActivity()); View view = inflater.inflate(R.layout.fragment_topics, container, false); setHtmlMode(view, R.id.topics_description); view.findViewById(R.id.topics_subscribe).setOnClickListener(this); return view; } @Override public void onStart() { super.onStart(); refresh(); } @Override public void onClick(View v) { if (v.getId() == R.id.topics_subscribe) { subscribe(); } else if (ACTION_UNSUBSCRIBE.equals(v.getTag(R.id.tag_action))) { unsubscribe(v); } } @Override public void refresh() { float density = getActivity().getResources().getDisplayMetrics().density; SimpleArrayMap<String, Sender> addressBook = mSenders.getSenders(); LinearLayout sendersList = new LinearLayout(getActivity()); sendersList.setOrientation(LinearLayout.VERTICAL); for (int i = 0; i < addressBook.size(); i++) { Sender sender = addressBook.valueAt(i); // Check if at least a topic is subscribed for this sender int subscribedTopics = 0; for (Boolean subscribed : sender.topics.values()) { if (subscribed) { subscribedTopics++; } } if (subscribedTopics > 0) { LinearLayout senderRow = (LinearLayout) getActivity().getLayoutInflater() .inflate(R.layout.widget_icon_text_button_row, sendersList, false); ImageView senderIcon = (ImageView) senderRow.findViewById(R.id.widget_itbr_icon); TextView senderLabel = (TextView) senderRow.findViewById(R.id.widget_itbr_text); senderRow.findViewById(R.id.widget_itbr_button).setVisibility(View.GONE); senderIcon.setImageResource(R.drawable.cloud_googblue); senderIcon.setPadding(0, 0, (int) (8 * density), 0); senderLabel.setText(getString(R.string.topics_sender_id, sender.senderId)); sendersList.addView(senderRow); for (Map.Entry<String, Boolean> topic : sender.topics.entrySet()) { if (topic.getValue()) { LinearLayout row = (LinearLayout) getActivity().getLayoutInflater() .inflate(R.layout.widget_icon_text_button_row, sendersList, false); ImageView icon = (ImageView) row.findViewById(R.id.widget_itbr_icon); TextView label = (TextView) row.findViewById(R.id.widget_itbr_text); Button button = (Button) row.findViewById(R.id.widget_itbr_button); icon.setImageResource(R.drawable.bigtop_updates_grey600); label.setText(topic.getKey()); button.setText(R.string.topics_unsubscribe); button.setTag(R.id.tag_action, ACTION_UNSUBSCRIBE); button.setTag(R.id.tag_senderid, sender.senderId); button.setTag(R.id.tag_topic, topic.getKey()); button.setOnClickListener(this); row.setPadding((int) (16 * density), 0, 0, 0); sendersList.addView(row); } } } } if (sendersList.getChildCount() == 0) { TextView noTokens = new TextView(getActivity()); noTokens.setText(getString(R.string.topics_no_topic_subscribed)); noTokens.setTypeface(null, Typeface.ITALIC); sendersList.addView(noTokens); } FrameLayout topicsView = (FrameLayout) getActivity().findViewById(R.id.topics_list_wrapper); topicsView.removeAllViews(); topicsView.addView(sendersList); } private void subscribe() { Intent startSelectActivityIntent = SelectActivity.pickTopic(getActivity(), R.id.topics_subscribe); startActivityForResult(startSelectActivityIntent, 0); } @Override public void handleAddressBookSelection(int id, String senderId, String topic) { if (id == R.id.topics_subscribe) { Boolean subscribed = mSenders.getSender(senderId).topics.get(topic); if (subscribed) { Toast.makeText(getActivity(), getString(R.string.topics_already_subscribed), Toast.LENGTH_SHORT) .show(); return; } Token gcmToken = mSenders.getSender(senderId).getGcmDemoAppToken(); if (gcmToken == null) { Toast.makeText(getActivity(), getString(R.string.topics_sender_not_registered), Toast.LENGTH_SHORT) .show(); return; } Toast.makeText(getActivity(), getString(R.string.topics_subscribing, topic), Toast.LENGTH_SHORT).show(); mPubSubHelper.subscribeTopic(senderId, gcmToken.token, topic, null); } } private void unsubscribe(View v) { String senderId = (String) v.getTag(R.id.tag_senderid); String topic = (String) v.getTag(R.id.tag_topic); Sender sender = mSenders.getSender(senderId); Token gcmToken = (sender != null) ? sender.getGcmDemoAppToken() : null; if (gcmToken == null) { mLogger.log(Log.ERROR, "gcmToken missing while un-subscribing from topic."); return; } Toast.makeText(getActivity(), getString(R.string.topics_unsubscribing, topic), Toast.LENGTH_SHORT).show(); mPubSubHelper.unsubscribeTopic(senderId, gcmToken.token, topic); } }