MP1_CalebFontenot

Book Files/29_BroadcastIntents/PhotoGallery/app/src/androidTest/java/com/bignerdranch/android/photogallery/ExampleInstrumentedTest.java

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+package com.bignerdranch.android.photogallery;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.bignerdranch.android.photogallery", appContext.getPackageName());
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/AndroidManifest.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.bignerdranch.android.photogallery">
+    <permission android:name="com.bignerdranch.android.photogallery.PRIVATE"
+                android:protectionLevel="signature" />
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="com.bignerdranch.android.photogallery.PRIVATE" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".PhotoGalleryActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service android:name=".PollService" />
+
+        <receiver android:name=".StartupReceiver" >
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
+        <receiver android:name=".NotificationReceiver"
+                  android:exported="false">
+            <intent-filter
+                android:priority="-999">
+                <action
+                    android:name="com.bignerdranch.android.photogallery.SHOW_NOTIFICATION" />
+            </intent-filter>
+        </receiver>
+    </application>
+
+</manifest>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/FlickrFetchr.java

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+package com.bignerdranch.android.photogallery;
+
+import android.net.Uri;
+import android.util.Log;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+public class FlickrFetchr {
+    private static final String TAG = "FlickrFetchr";
+
+    private static final String API_KEY = "REPLACE_ME_WITH_A_REAL_KEY";
+    private static final String FETCH_RECENTS_METHOD = "flickr.photos.getRecent";
+    private static final String SEARCH_METHOD = "flickr.photos.search";
+    private static final Uri ENDPOINT = Uri
+            .parse("https://api.flickr.com/services/rest/")
+            .buildUpon()
+            .appendQueryParameter("api_key", API_KEY)
+            .appendQueryParameter("format", "json")
+            .appendQueryParameter("nojsoncallback", "1")
+            .appendQueryParameter("extras", "url_s")
+            .build();
+
+    public byte[] getUrlBytes(String urlSpec) throws IOException {
+        URL url = new URL(urlSpec);
+        HttpURLConnection connection = (HttpURLConnection)url.openConnection();
+        try {
+            ByteArrayOutputStream out = new ByteArrayOutputStream();
+            InputStream in = connection.getInputStream();
+            if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
+                throw new IOException(connection.getResponseMessage() +
+                        ": with " +
+                        urlSpec);
+            }
+            int bytesRead = 0;
+            byte[] buffer = new byte[1024];
+            while ((bytesRead = in.read(buffer)) > 0) {
+                out.write(buffer, 0, bytesRead);
+            }
+            out.close();
+            return out.toByteArray();
+        } finally {
+            connection.disconnect();
+        }
+    }
+
+    public String getUrlString(String urlSpec) throws IOException {
+        return new String(getUrlBytes(urlSpec));
+    }
+
+    public List<GalleryItem> fetchRecentPhotos() {
+        String url = buildUrl(FETCH_RECENTS_METHOD, null);
+        return downloadGalleryItems(url);
+    }
+
+    public List<GalleryItem> searchPhotos(String query) {
+        String url = buildUrl(SEARCH_METHOD, query);
+        return downloadGalleryItems(url);
+    }
+
+    private List<GalleryItem> downloadGalleryItems(String url) {
+        List<GalleryItem> items = new ArrayList<>();
+
+        try {
+            String jsonString = getUrlString(url);
+            Log.i(TAG, "Received JSON: " + jsonString);
+            JSONObject jsonBody = new JSONObject(jsonString);
+            parseItems(items, jsonBody);
+        } catch (IOException ioe) {
+            Log.e(TAG, "Failed to fetch items", ioe);
+        } catch (JSONException je) {
+            Log.e(TAG, "Failed to parse JSON", je);
+        }
+
+        return items;
+    }
+
+    private String buildUrl(String method, String query) {
+        Uri.Builder uriBuilder = ENDPOINT.buildUpon()
+                .appendQueryParameter("method", method);
+
+        if (method.equals(SEARCH_METHOD)) {
+            uriBuilder.appendQueryParameter("text", query);
+        }
+
+        return uriBuilder.build().toString();
+    }
+
+    private void parseItems(List<GalleryItem> items, JSONObject jsonBody)
+            throws IOException, JSONException {
+
+        JSONObject photosJsonObject = jsonBody.getJSONObject("photos");
+        JSONArray photoJsonArray = photosJsonObject.getJSONArray("photo");
+
+        for (int i = 0; i < photoJsonArray.length(); i++) {
+            JSONObject photoJsonObject = photoJsonArray.getJSONObject(i);
+
+            GalleryItem item = new GalleryItem();
+            item.setId(photoJsonObject.getString("id"));
+            item.setCaption(photoJsonObject.getString("title"));
+            
+            if (!photoJsonObject.has("url_s")) {
+                continue;
+            }
+            
+            item.setUrl(photoJsonObject.getString("url_s"));
+            items.add(item);
+        }
+    }
+
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/GalleryItem.java

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+package com.bignerdranch.android.photogallery;
+
+public class GalleryItem {
+    private String mCaption;
+    private String mId;
+    private String mUrl;
+
+    public String getCaption() {
+        return mCaption;
+    }
+
+    public void setCaption(String caption) {
+        mCaption = caption;
+    }
+
+    public String getId() {
+        return mId;
+    }
+
+    public void setId(String id) {
+        mId = id;
+    }
+
+    public String getUrl() {
+        return mUrl;
+    }
+
+    public void setUrl(String url) {
+        mUrl = url;
+    }
+
+    @Override
+    public String toString() {
+        return mCaption;
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/NotificationReceiver.java

@@ -0,0 +1,30 @@
+package com.bignerdranch.android.photogallery;
+
+import android.app.Activity;
+import android.app.Notification;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.support.v4.app.NotificationManagerCompat;
+import android.util.Log;
+
+public class NotificationReceiver extends BroadcastReceiver {
+    private static final String TAG = "NotificationReceiver";
+
+    @Override
+    public void onReceive(Context c, Intent i) {
+        Log.i(TAG, "received result: " + getResultCode());
+        if (getResultCode() != Activity.RESULT_OK) {
+            // A foreground activity cancelled the broadcast
+            return;
+        }
+
+        int requestCode = i.getIntExtra(PollService.REQUEST_CODE, 0);
+        Notification notification = (Notification)
+                i.getParcelableExtra(PollService.NOTIFICATION);
+
+        NotificationManagerCompat notificationManager = 
+                NotificationManagerCompat.from(c);
+        notificationManager.notify(requestCode, notification);
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/PhotoGalleryActivity.java

@@ -0,0 +1,17 @@
+package com.bignerdranch.android.photogallery;
+
+import android.content.Context;
+import android.content.Intent;
+import android.support.v4.app.Fragment;
+
+public class PhotoGalleryActivity extends SingleFragmentActivity {
+
+    public static Intent newIntent(Context context) {
+        return new Intent(context, PhotoGalleryActivity.class);
+    }
+
+    @Override
+    protected Fragment createFragment() {
+        return PhotoGalleryFragment.newInstance();
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/PhotoGalleryFragment.java

@@ -0,0 +1,222 @@
+package com.bignerdranch.android.photogallery;
+
+import android.graphics.Bitmap;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.os.Handler;
+import android.support.v4.app.Fragment;
+import android.support.v7.widget.GridLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.SearchView;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PhotoGalleryFragment extends VisibleFragment {
+    private static final String TAG = "PhotoGalleryFragment";
+
+    private RecyclerView mPhotoRecyclerView;
+    private List<GalleryItem> mItems = new ArrayList<>();
+    private ThumbnailDownloader<PhotoHolder> mThumbnailDownloader;
+
+    public static PhotoGalleryFragment newInstance() {
+        return new PhotoGalleryFragment();
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setRetainInstance(true);
+        setHasOptionsMenu(true);
+
+        updateItems();
+
+        Handler responseHandler = new Handler();
+        mThumbnailDownloader = new ThumbnailDownloader<>(responseHandler);
+        mThumbnailDownloader.setThumbnailDownloadListener(
+            new ThumbnailDownloader.ThumbnailDownloadListener<PhotoHolder>() {
+                @Override
+                public void onThumbnailDownloaded(PhotoHolder photoHolder, Bitmap bitmap) {
+                    Drawable drawable = new BitmapDrawable(getResources(), bitmap);
+                    photoHolder.bindDrawable(drawable);
+                }
+            }
+        );
+        mThumbnailDownloader.start();
+        mThumbnailDownloader.getLooper();
+        Log.i(TAG, "Background thread started");
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View v = inflater.inflate(R.layout.fragment_photo_gallery, container, false);
+
+        mPhotoRecyclerView = (RecyclerView) v.findViewById(R.id.photo_recycler_view);
+        mPhotoRecyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 3));
+
+        setupAdapter();
+
+        return v;
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        mThumbnailDownloader.clearQueue();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        mThumbnailDownloader.quit();
+        Log.i(TAG, "Background thread destroyed");
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater menuInflater) {
+        super.onCreateOptionsMenu(menu, menuInflater);
+        menuInflater.inflate(R.menu.fragment_photo_gallery, menu);
+
+        MenuItem searchItem = menu.findItem(R.id.menu_item_search);
+        final SearchView searchView = (SearchView) searchItem.getActionView();
+
+            searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
+                @Override
+                public boolean onQueryTextSubmit(String s) {
+                    Log.d(TAG, "QueryTextSubmit: " + s);
+                    QueryPreferences.setStoredQuery(getActivity(), s);
+                    updateItems();
+                    return true;
+                }
+
+                @Override
+                public boolean onQueryTextChange(String s) {
+                    Log.d(TAG, "QueryTextChange: " + s);
+                    return false;
+                }
+            });
+
+        searchView.setOnSearchClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                String query = QueryPreferences.getStoredQuery(getActivity());
+                searchView.setQuery(query, false);
+            }
+        });
+
+        MenuItem toggleItem = menu.findItem(R.id.menu_item_toggle_polling);
+        if (PollService.isServiceAlarmOn(getActivity())) {
+            toggleItem.setTitle(R.string.stop_polling);
+        } else {
+            toggleItem.setTitle(R.string.start_polling);
+        }
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.menu_item_clear:
+                QueryPreferences.setStoredQuery(getActivity(), null);
+                updateItems();
+                return true;
+            case R.id.menu_item_toggle_polling:
+                boolean shouldStartAlarm = !PollService.isServiceAlarmOn(getActivity());
+                PollService.setServiceAlarm(getActivity(), shouldStartAlarm);
+                getActivity().invalidateOptionsMenu();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
+    private void updateItems() {
+        String query = QueryPreferences.getStoredQuery(getActivity());
+        new FetchItemsTask(query).execute();
+    }
+
+    private void setupAdapter() {
+        if (isAdded()) {
+            mPhotoRecyclerView.setAdapter(new PhotoAdapter(mItems));
+        }
+    }
+
+    private class PhotoHolder extends RecyclerView.ViewHolder {
+        private ImageView mItemImageView;
+
+        public PhotoHolder(View itemView) {
+            super(itemView);
+
+            mItemImageView = (ImageView) itemView.findViewById(R.id.item_image_view);
+        }
+
+        public void bindDrawable(Drawable drawable) {
+            mItemImageView.setImageDrawable(drawable);
+        }
+    }
+
+    private class PhotoAdapter extends RecyclerView.Adapter<PhotoHolder> {
+
+        private List<GalleryItem> mGalleryItems;
+
+        public PhotoAdapter(List<GalleryItem> galleryItems) {
+            mGalleryItems = galleryItems;
+        }
+
+        @Override
+        public PhotoHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
+            LayoutInflater inflater = LayoutInflater.from(getActivity());
+            View view = inflater.inflate(R.layout.list_item_gallery, viewGroup, false);
+            return new PhotoHolder(view);
+        }
+
+        @Override
+        public void onBindViewHolder(PhotoHolder photoHolder, int position) {
+            GalleryItem galleryItem = mGalleryItems.get(position);
+            Drawable placeholder = getResources().getDrawable(R.drawable.bill_up_close);
+            photoHolder.bindDrawable(placeholder);
+            mThumbnailDownloader.queueThumbnail(photoHolder, galleryItem.getUrl());
+        }
+
+        @Override
+        public int getItemCount() {
+            return mGalleryItems.size();
+        }
+    }
+
+    private class FetchItemsTask extends AsyncTask<Void,Void,List<GalleryItem>> {
+        private String mQuery;
+
+        public FetchItemsTask(String query) {
+            mQuery = query;
+        }
+
+        @Override
+        protected List<GalleryItem> doInBackground(Void... params) {
+
+            if (mQuery == null) {
+                return new FlickrFetchr().fetchRecentPhotos();
+            } else {
+                return new FlickrFetchr().searchPhotos(mQuery);
+            }
+        }
+
+        @Override
+        protected void onPostExecute(List<GalleryItem> items) {
+            mItems = items;
+            setupAdapter();
+        }
+
+    }
+
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/PollService.java

@@ -0,0 +1,130 @@
+package com.bignerdranch.android.photogallery;
+
+import android.app.Activity;
+import android.app.AlarmManager;
+import android.app.IntentService;
+import android.app.Notification;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.net.ConnectivityManager;
+import android.os.SystemClock;
+import android.support.v4.app.NotificationCompat;
+import android.util.Log;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+public class PollService extends IntentService {
+    private static final String TAG = "PollService";
+
+    private static final long POLL_INTERVAL_MS = TimeUnit.MINUTES.toMillis(15);
+
+    public static final String ACTION_SHOW_NOTIFICATION =
+            "com.bignerdranch.android.photogallery.SHOW_NOTIFICATION";
+    public static final String PERM_PRIVATE =
+            "com.bignerdranch.android.photogallery.PRIVATE";
+    public static final String REQUEST_CODE = "REQUEST_CODE";
+    public static final String NOTIFICATION = "NOTIFICATION";
+
+    public static Intent newIntent(Context context) {
+        return new Intent(context, PollService.class);
+    }
+
+    public static void setServiceAlarm(Context context, boolean isOn) {
+        Intent i = PollService.newIntent(context);
+        PendingIntent pi = PendingIntent.getService(
+                context, 0, i, 0);
+
+        AlarmManager alarmManager = (AlarmManager)
+                context.getSystemService(Context.ALARM_SERVICE);
+
+        if (isOn) {
+            alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME,
+                    SystemClock.elapsedRealtime(), POLL_INTERVAL_MS, pi);
+        } else {
+            alarmManager.cancel(pi);
+            pi.cancel();
+        }
+
+        QueryPreferences.setAlarmOn(context, isOn);
+    }
+
+    public static boolean isServiceAlarmOn(Context context) {
+        Intent i = PollService.newIntent(context);
+        PendingIntent pi = PendingIntent
+                .getService(context, 0, i, PendingIntent.FLAG_NO_CREATE);
+        return pi != null;
+    }
+
+    public PollService() {
+        super(TAG);
+    }
+
+    @Override
+    protected void onHandleIntent(Intent intent) {
+
+        if (!isNetworkAvailableAndConnected()) {
+            return;
+        }
+
+        String query = QueryPreferences.getStoredQuery(this);
+        String lastResultId = QueryPreferences.getLastResultId(this);
+        List<GalleryItem> items;
+
+        if (query == null) {
+            items = new FlickrFetchr().fetchRecentPhotos();
+        } else {
+            items = new FlickrFetchr().searchPhotos(query);
+        }
+
+        if (items.size() == 0) {
+            return;
+        }
+
+        String resultId = items.get(0).getId();
+        if (resultId.equals(lastResultId)) {
+            Log.i(TAG, "Got an old result: " + resultId);
+        } else {
+            Log.i(TAG, "Got a new result: " + resultId);
+
+            Resources resources = getResources();
+            Intent i = PhotoGalleryActivity.newIntent(this);
+            PendingIntent pi = PendingIntent
+                    .getActivity(this, 0, i, 0);
+
+            Notification notification = new NotificationCompat.Builder(this)
+                    .setTicker(resources.getString(R.string.new_pictures_title))
+                    .setSmallIcon(android.R.drawable.ic_menu_report_image)
+                    .setContentTitle(resources.getString(R.string.new_pictures_title))
+                    .setContentText(resources.getString(R.string.new_pictures_text))
+                    .setContentIntent(pi)
+                    .setAutoCancel(true)
+                    .build();
+
+            showBackgroundNotification(0, notification);
+        }
+
+        QueryPreferences.setLastResultId(this, resultId);
+    }
+
+    private void showBackgroundNotification(int requestCode, Notification notification) {
+        Intent i = new Intent(ACTION_SHOW_NOTIFICATION);
+        i.putExtra(REQUEST_CODE, requestCode);
+        i.putExtra(NOTIFICATION, notification);
+        sendOrderedBroadcast(i, PERM_PRIVATE, null, null,
+                Activity.RESULT_OK, null, null);
+    }
+
+    private boolean isNetworkAvailableAndConnected() {
+        ConnectivityManager cm =
+                (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
+
+        boolean isNetworkAvailable = cm.getActiveNetworkInfo() != null;
+        boolean isNetworkConnected = isNetworkAvailable &&
+                cm.getActiveNetworkInfo().isConnected();
+
+        return isNetworkConnected;
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/QueryPreferences.java

@@ -0,0 +1,48 @@
+package com.bignerdranch.android.photogallery;
+
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+public class QueryPreferences {
+
+    private static final String PREF_SEARCH_QUERY = "searchQuery";
+    private static final String PREF_LAST_RESULT_ID = "lastResultId";
+    private static final String PREF_IS_ALARM_ON = "isAlarmOn";
+
+    public static String getStoredQuery(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context)
+                .getString(PREF_SEARCH_QUERY, null);
+    }
+
+    public static void setStoredQuery(Context context, String query) {
+        PreferenceManager.getDefaultSharedPreferences(context)
+                .edit()
+                .putString(PREF_SEARCH_QUERY, query)
+                .apply();
+    }
+
+    public static String getLastResultId(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context)
+                .getString(PREF_LAST_RESULT_ID, null);
+    }
+
+    public static void setLastResultId(Context context, String lastResultId) {
+        PreferenceManager.getDefaultSharedPreferences(context)
+                .edit()
+                .putString(PREF_LAST_RESULT_ID, lastResultId)
+                .apply();
+    }
+
+    public static boolean isAlarmOn(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context)
+                .getBoolean(PREF_IS_ALARM_ON, false);
+    }
+
+    public static void setAlarmOn(Context context, boolean isOn) {
+        PreferenceManager.getDefaultSharedPreferences(context)
+                .edit()
+                .putBoolean(PREF_IS_ALARM_ON, isOn)
+                .apply();
+    }
+
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/SingleFragmentActivity.java

@@ -0,0 +1,33 @@
+package com.bignerdranch.android.photogallery;
+
+import android.os.Bundle;
+import android.support.annotation.LayoutRes;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v7.app.AppCompatActivity;
+
+public abstract class SingleFragmentActivity extends AppCompatActivity {
+
+    protected abstract Fragment createFragment();
+
+    @LayoutRes
+    protected int getLayoutResId() {
+        return R.layout.activity_fragment;
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(getLayoutResId());
+
+        FragmentManager fm = getSupportFragmentManager();
+        Fragment fragment = fm.findFragmentById(R.id.fragment_container);
+
+        if (fragment == null) {
+            fragment = createFragment();
+            fm.beginTransaction()
+                    .add(R.id.fragment_container, fragment)
+                    .commit();
+        }
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/StartupReceiver.java

@@ -0,0 +1,19 @@
+package com.bignerdranch.android.photogallery;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+public class StartupReceiver extends BroadcastReceiver{
+    private static final String TAG = "StartupReceiver";
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        Log.i(TAG, "Received broadcast intent: " + intent.getAction());
+
+        boolean isOn = QueryPreferences.isAlarmOn(context);
+        PollService.setServiceAlarm(context, isOn);
+    }
+
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/ThumbnailDownloader.java

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+package com.bignerdranch.android.photogallery;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+import android.util.Log;
+
+import java.io.IOException;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+public class ThumbnailDownloader<T> extends HandlerThread {
+    private static final String TAG = "ThumbnailDownloader";
+    private static final int MESSAGE_DOWNLOAD = 0;
+
+    private boolean mHasQuit = false;
+    private Handler mRequestHandler;
+    private ConcurrentMap<T,String> mRequestMap = new ConcurrentHashMap<>();
+    private Handler mResponseHandler;
+    private ThumbnailDownloadListener<T> mThumbnailDownloadListener;
+
+    public interface ThumbnailDownloadListener<T> {
+        void onThumbnailDownloaded(T target, Bitmap bitmap);
+    }
+
+    public void setThumbnailDownloadListener(ThumbnailDownloadListener<T> listener) {
+        mThumbnailDownloadListener = listener;
+    }
+
+    public ThumbnailDownloader(Handler responseHandler) {
+        super(TAG);
+        mResponseHandler = responseHandler;
+    }
+
+    @Override
+    protected void onLooperPrepared() {
+        mRequestHandler = new Handler() {
+            @Override
+            public void handleMessage(Message msg) {
+                if (msg.what == MESSAGE_DOWNLOAD) {
+                    T target = (T) msg.obj;
+                    Log.i(TAG, "Got a request for URL: " + mRequestMap.get(target));
+                    handleRequest(target);
+                }
+            }
+        };
+    }
+
+    @Override
+    public boolean quit() {
+        mHasQuit = true;
+        return super.quit();
+    }
+
+    public void queueThumbnail(T target, String url) {
+        Log.i(TAG, "Got a URL: " + url);
+
+        if (url == null) {
+            mRequestMap.remove(target);
+        } else {
+            mRequestMap.put(target, url);
+            mRequestHandler.obtainMessage(MESSAGE_DOWNLOAD, target)
+                    .sendToTarget();
+        }
+    }
+
+    public void clearQueue() {
+        mRequestHandler.removeMessages(MESSAGE_DOWNLOAD);
+        mRequestMap.clear();
+    }
+
+    private void handleRequest(final T target) {
+        try {
+            final String url = mRequestMap.get(target);
+
+            if (url == null) {
+                return;
+            }
+
+            byte[] bitmapBytes = new FlickrFetchr().getUrlBytes(url);
+            final Bitmap bitmap = BitmapFactory
+                    .decodeByteArray(bitmapBytes, 0, bitmapBytes.length);
+            Log.i(TAG, "Bitmap created");
+
+            mResponseHandler.post(new Runnable() {
+                public void run() {
+                    if (mRequestMap.get(target) != url ||
+                            mHasQuit) {
+                        return;
+                    }
+
+                    mRequestMap.remove(target);
+                    mThumbnailDownloadListener.onThumbnailDownloaded(target, bitmap);
+                }
+            });
+        } catch (IOException ioe) {
+            Log.e(TAG, "Error downloading image", ioe);
+        }
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/java/com/bignerdranch/android/photogallery/VisibleFragment.java

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+package com.bignerdranch.android.photogallery;
+
+import android.app.Activity;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.support.v4.app.Fragment;
+import android.util.Log;
+import android.widget.Toast;
+
+public abstract class VisibleFragment extends Fragment {
+    private static final String TAG = "VisibleFragment";
+
+    private BroadcastReceiver mOnShowNotification = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            // If we receive this, we're visible, so cancel
+            // the notification
+            Log.i(TAG, "canceling notification");
+            setResultCode(Activity.RESULT_CANCELED);
+        }
+    };
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        IntentFilter filter = new IntentFilter(PollService.ACTION_SHOW_NOTIFICATION);
+        getActivity().registerReceiver(mOnShowNotification, filter,
+                PollService.PERM_PRIVATE, null);
+    }
+
+    @Override
+    public void onStop() {
+        super.onStop();
+        getActivity().unregisterReceiver(mOnShowNotification);
+    }
+}

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/layout/activity_fragment.xml

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+<FrameLayout android:id="@+id/fragment_container"
+             xmlns:android="http://schemas.android.com/apk/res/android"
+             android:layout_width="match_parent"
+             android:layout_height="match_parent" />

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/layout/fragment_photo_gallery.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<android.support.v7.widget.RecyclerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/photo_recycler_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="com.bignerdranch.android.photogallery.PhotoGalleryActivity"/>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/layout/list_item_gallery.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+           android:id="@+id/item_image_view"
+           android:layout_width="match_parent"
+           android:layout_height="120dp"
+           android:layout_gravity="center"
+           android:scaleType="centerCrop" />

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/menu/fragment_photo_gallery.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item android:id="@+id/menu_item_search"
+          android:title="@string/search"
+          app:actionViewClass="android.support.v7.widget.SearchView"
+          app:showAsAction="ifRoom" />
+
+    <item android:id="@+id/menu_item_clear"
+          android:title="@string/clear_search"
+          app:showAsAction="never" />
+
+    <item android:id="@+id/menu_item_toggle_polling"
+          android:title="@string/start_polling"
+          app:showAsAction="ifRoom" />
+</menu>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/values-w820dp/dimens.xml

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+<resources>
+    <!-- Example customization of dimensions originally defined in res/values/dimens.xml
+         (such as screen margins) for screens with more than 820dp of available width. This
+         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
+    <dimen name="activity_horizontal_margin">64dp</dimen>
+</resources>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/values/dimens.xml

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+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+</resources>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">PhotoGallery</string>
+    <string name="search">Search</string>
+    <string name="clear_search">Clear Search</string>
+    <string name="start_polling">Start polling</string>
+    <string name="stop_polling">Stop polling</string>
+    <string name="new_pictures_title">New PhotoGallery Pictures</string>
+    <string name="new_pictures_text">You have new pictures in PhotoGallery.</string>
+</resources>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/main/res/values/styles.xml

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+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

Book Files/29_BroadcastIntents/PhotoGallery/app/src/test/java/com/bignerdranch/android/photogallery/ExampleUnitTest.java

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+package com.bignerdranch.android.photogallery;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}