Java tutorial
/* * Copyright 2012 GitHub Inc. * * 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.github.mobile.gauges.ui.airtraffic; import static android.os.Build.VERSION.SDK_INT; import static android.view.View.STATUS_BAR_HIDDEN; import static com.github.mobile.gauges.IntentConstants.GAUGES; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.widget.ImageView; import android.widget.TextView; import com.emorym.android_pusher.Pusher; import com.github.mobile.gauges.GaugesServiceProvider; import com.github.mobile.gauges.R.id; import com.github.mobile.gauges.R.layout; import com.github.mobile.gauges.core.Gauge; import com.github.mobile.gauges.ui.GaugeListLoader; import com.google.inject.Inject; import java.util.Collection; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.concurrent.Executor; import java.util.concurrent.Executors; import roboguice.activity.RoboFragmentActivity; import roboguice.inject.InjectView; /** * Activity to display list of gauge summaries */ public class AirTrafficActivity extends RoboFragmentActivity implements LoaderCallbacks<List<Gauge>> { private static final String CHANNEL_PREFIX = "private-"; @Inject private GaugesServiceProvider serviceProvider; @InjectView(id.air_traffic) private AirTrafficView airTrafficView; @InjectView(id.iv_pin) private ImageView pinImage; @InjectView(id.tv_gauge_name) private TextView gaugeText; @InjectView(id.tv_gauge_location) private TextView gaugeLocation; private Map<String, String> gaugeTitles = new HashMap<String, String>(); private final Executor backgroundThread = Executors.newFixedThreadPool(1); private Pusher pusher; private AirTrafficResourceProvider resourceProvider; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(layout.airtraffic_activity); pusher = new GaugesPusher(serviceProvider); resourceProvider = new AirTrafficResourceProvider(getResources()); airTrafficView.setResourceProvider(resourceProvider).setLabelHeight(gaugeText.getTextSize() * 3 / 2); getSupportActionBar().hide(); if (SDK_INT >= 14) // On ICS this equivalent to SYSTEM_UI_FLAG_LOW_PROFILE - the dimmed-menu-buttons mode getWindow().getDecorView().setSystemUiVisibility(STATUS_BAR_HIDDEN); @SuppressWarnings("unchecked") Collection<Gauge> intentGauges = (Collection<Gauge>) getIntent().getSerializableExtra(GAUGES); if (intentGauges != null && !intentGauges.isEmpty()) loadGauges(intentGauges); else getSupportLoaderManager().initLoader(0, null, this); } @Override protected void onPause() { super.onPause(); unsubscribeFromGaugeChannels(gaugeTitles.keySet()); airTrafficView.pause(); } @Override protected void onResume() { super.onResume(); airTrafficView.resume(); subscribeToGaugeChannels(gaugeTitles.keySet()); } @Override public Loader<List<Gauge>> onCreateLoader(int id, Bundle args) { return new GaugeListLoader(this, serviceProvider); } @Override public void onLoadFinished(Loader<List<Gauge>> listLoader, List<Gauge> gauges) { unsubscribeFromGaugeChannels(gaugeTitles.keySet()); loadGauges(gauges); subscribeToGaugeChannels(gaugeTitles.keySet()); } private void loadGauges(Collection<Gauge> gauges) { Map<String, String> newGauges = new HashMap<String, String>(); for (Gauge gauge : gauges) newGauges.put(gauge.getId(), gauge.getTitle()); gaugeTitles = newGauges; resourceProvider.setGauges(gauges); } /** * Get geographic location label for hit * * @param hit * @return label */ protected String getLocation(final Hit hit) { String country = hit.country != null ? hit.country : ""; if (country.length() == 0) return ""; String city = hit.city != null ? hit.city : ""; String region = hit.region != null ? hit.region : ""; String location; if (region.length() > 0 && ("United States".equals(country) || "Canada".equals(country))) location = region; else location = country; if (city.length() > 0) return city + ", " + location; else return location; } /** * Get page title of hit * * @param hit * @return title */ protected String getTitle(final Hit hit) { if (hit.title != null && hit.title.length() > 0) { int separator = hit.title.indexOf(" // "); if (separator == -1) separator = hit.title.indexOf(" - "); if (separator > 0) return hit.title.substring(0, separator); else return hit.title; } else return ""; } @Override public void onLoaderReset(Loader<List<Gauge>> listLoader) { } private void subscribeToGaugeChannels(final Collection<String> subscribeIds) { if (subscribeIds.isEmpty()) return; backgroundThread.execute(new Runnable() { public void run() { final AirTrafficPusherCallback callback = new AirTrafficPusherCallback() { @Override protected void onHit(final Hit hit) { airTrafficView.addHit(hit); gaugeText.post(new Runnable() { public void run() { String gaugeTitle = gaugeTitles.get(hit.siteId); if (gaugeTitle == null) return; Bitmap bitmap = resourceProvider.getPin(hit.siteId); if (bitmap != null) pinImage.setBackgroundDrawable(new BitmapDrawable(bitmap)); else pinImage.setBackgroundDrawable(null); gaugeLocation.setText(getLocation(hit)); String title = getTitle(hit); if (title.length() > 0) gaugeText.setText(gaugeTitle + ": " + title); else gaugeText.setText(gaugeTitle); } }); } }; for (String gaugeId : subscribeIds) pusher.subscribe(CHANNEL_PREFIX + gaugeId).bind("hit", callback); } }); } private void unsubscribeFromGaugeChannels(final Collection<String> unsubscribeIds) { if (unsubscribeIds.isEmpty()) return; backgroundThread.execute(new Runnable() { public void run() { for (String gaugeId : unsubscribeIds) pusher.unsubscribe(CHANNEL_PREFIX + gaugeId); } }); } }