Cancel notifications on opening notifications tab (#450)

app/src/main/java/com/keylesspalace/tusky/BaseActivity.java

@@ -187,15 +187,6 @@ public class BaseActivity extends AppCompatActivity {
         JobManager.instance().cancelAllForTag(NotificationPullJobCreator.NOTIFICATIONS_JOB_TAG);
     }
 
-    protected void clearNotifications() {
-        SharedPreferences notificationPreferences =
-                getApplicationContext().getSharedPreferences("Notifications", MODE_PRIVATE);
-        notificationPreferences.edit().putString("current", "[]").apply();
-
-        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
-        manager.cancel(NotificationPullJobCreator.NOTIFY_ID);
-    }
-
     protected void setPullNotificationCheckInterval(long minutes) {
         JobManager.instance().cancelAllForTag(NotificationPullJobCreator.NOTIFICATIONS_JOB_TAG);
         long checkInterval = 1000 * 60 * minutes;

app/src/main/java/com/keylesspalace/tusky/LoginActivity.java

@@ -40,7 +40,7 @@ import com.keylesspalace.tusky.entity.AccessToken;
 import com.keylesspalace.tusky.entity.AppCredentials;
 import com.keylesspalace.tusky.network.MastodonApi;
 import com.keylesspalace.tusky.util.CustomTabsHelper;
-import com.keylesspalace.tusky.util.NotificationMaker;
+import com.keylesspalace.tusky.util.NotificationManager;
 import com.keylesspalace.tusky.util.OkHttpUtils;
 
 import java.util.HashMap;
@@ -396,7 +396,7 @@ public class LoginActivity extends AppCompatActivity {
         }
 
         //create notification channels ahead of time so users can edit the settings
-        NotificationMaker.createNotificationChannels(this);
+        NotificationManager.createNotificationChannels(this);
 
         Intent intent = new Intent(this, MainActivity.class);
         startActivity(intent);

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -41,6 +41,7 @@ import com.keylesspalace.tusky.entity.Account;
 import com.keylesspalace.tusky.interfaces.ActionButtonActivity;
 import com.keylesspalace.tusky.pager.TimelinePagerAdapter;
 import com.keylesspalace.tusky.receiver.TimelineReceiver;
+import com.keylesspalace.tusky.util.NotificationManager;
 import com.keylesspalace.tusky.util.ThemeUtils;
 import com.mikepenz.google_material_typeface_library.GoogleMaterial;
 import com.mikepenz.materialdrawer.AccountHeader;
@@ -225,7 +226,7 @@ public class MainActivity extends BaseActivity implements ActionButtonActivity {
     protected void onResume() {
         super.onResume();
 
-        clearNotifications();
+        NotificationManager.clearNotifications(this);
 
         /* After editing a profile, the profile header in the navigation drawer needs to be
          * refreshed */

app/src/main/java/com/keylesspalace/tusky/NotificationPullJobCreator.java

@@ -29,7 +29,7 @@ import com.keylesspalace.tusky.entity.Notification;
 import com.keylesspalace.tusky.json.SpannedTypeAdapter;
 import com.keylesspalace.tusky.network.AuthInterceptor;
 import com.keylesspalace.tusky.network.MastodonApi;
-import com.keylesspalace.tusky.util.NotificationMaker;
+import com.keylesspalace.tusky.util.NotificationManager;
 import com.keylesspalace.tusky.util.OkHttpUtils;
 
 import java.io.IOException;
@@ -48,8 +48,8 @@ import retrofit2.converter.gson.GsonConverterFactory;
 
 public final class NotificationPullJobCreator implements JobCreator {
 
+    public static final int NOTIFY_ID = 6; // chosen by fair dice roll, guaranteed to be random
     static final String NOTIFICATIONS_JOB_TAG = "notifications_job_tag";
-    static final int NOTIFY_ID = 6; // chosen by fair dice roll, guaranteed to be random
 
     private Context context;
 
@@ -130,7 +130,7 @@ public final class NotificationPullJobCreator implements JobCreator {
                 String id = notification.id;
                 if (!currentIds.contains(id)) {
                     currentIds.add(id);
-                    NotificationMaker.make(context, NOTIFY_ID, notification);
+                    NotificationManager.make(context, NOTIFY_ID, notification);
                 }
             }
             notificationsPreferences.edit()

app/src/main/java/com/keylesspalace/tusky/fragment/NotificationsFragment.java

@@ -15,6 +15,8 @@
 
 package com.keylesspalace.tusky.fragment;
 
+import android.app.Activity;
+import android.app.NotificationManager;
 import android.arch.core.util.Function;
 import android.content.Context;
 import android.content.SharedPreferences;
@@ -36,6 +38,7 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import com.keylesspalace.tusky.MainActivity;
+import com.keylesspalace.tusky.NotificationPullJobCreator;
 import com.keylesspalace.tusky.adapter.FooterViewHolder;
 import com.keylesspalace.tusky.adapter.NotificationsAdapter;
 import com.keylesspalace.tusky.R;
@@ -129,12 +132,12 @@ public class NotificationsFragment extends SFragment implements
 
     @Nullable
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                              @Nullable Bundle savedInstanceState) {
         View rootView = inflater.inflate(R.layout.fragment_timeline, container, false);
 
+        @NonNull Context context = inflater.getContext(); // from inflater to silence warning
         // Setup the SwipeRefreshLayout.
-        Context context = getContext();
         swipeRefreshLayout = rootView.findViewById(R.id.swipe_refresh_layout);
         swipeRefreshLayout.setOnRefreshListener(this);
         // Setup the RecyclerView.
@@ -176,6 +179,7 @@ public class NotificationsFragment extends SFragment implements
         super.onActivityCreated(savedInstanceState);
 
         MainActivity activity = (MainActivity) getActivity();
+        if (activity == null) throw new AssertionError("Activity is null");
 
         // MainActivity's layout is guaranteed to be inflated until onCreate returns.
         TabLayout layout = activity.findViewById(R.id.tab_layout);
@@ -232,15 +236,30 @@ public class NotificationsFragment extends SFragment implements
 
     @Override
     public void onDestroyView() {
-        TabLayout tabLayout = getActivity().findViewById(R.id.tab_layout);
+        Activity activity = getActivity();
+        if (activity == null) {
+            Log.e(TAG, "Activity is null");
+        } else {
+            TabLayout tabLayout = activity.findViewById(R.id.tab_layout);
             tabLayout.removeOnTabSelectedListener(onTabSelectedListener);
 
-        LocalBroadcastManager.getInstance(getContext())
+            LocalBroadcastManager.getInstance(activity)
                     .unregisterReceiver(timelineReceiver);
+        }
 
         super.onDestroyView();
     }
 
+    @Override
+    public void setUserVisibleHint(boolean isVisibleToUser) {
+        super.setUserVisibleHint(isVisibleToUser);
+        if (isVisibleToUser) {
+            //noinspection ConstantConditions
+            ((NotificationManager) getContext().getSystemService(Context.NOTIFICATION_SERVICE))
+                    .cancel(NotificationPullJobCreator.NOTIFY_ID);
+        }
+    }
+
     @Override
     public void onRefresh() {
         sendFetchNotificationsRequest(null, topId, FetchEnd.TOP, -1);

app/src/main/java/com/keylesspalace/tusky/fragment/PreferencesFragment.java

@@ -25,7 +25,7 @@ import android.support.annotation.XmlRes;
 import com.keylesspalace.tusky.BuildConfig;
 import com.keylesspalace.tusky.PreferencesActivity;
 import com.keylesspalace.tusky.R;
-import com.keylesspalace.tusky.util.NotificationMaker;
+import com.keylesspalace.tusky.util.NotificationManager;
 
 public class PreferencesFragment extends PreferenceFragment {
 
@@ -56,7 +56,7 @@ public class PreferencesFragment extends PreferenceFragment {
             //on Android O and newer, launch the system notification settings instead of the app settings
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 
-                 NotificationMaker.createNotificationChannels(getContext());
+                 NotificationManager.createNotificationChannels(getContext());
 
                     notificationPreferences.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                         @Override

app/src/main/java/com/keylesspalace/tusky/util/NotificationManager.java

@@ -16,7 +16,6 @@
 package com.keylesspalace.tusky.util;
 
 import android.app.NotificationChannel;
-import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
@@ -33,6 +32,7 @@ import android.support.v4.content.ContextCompat;
 import android.util.Log;
 
 import com.keylesspalace.tusky.MainActivity;
+import com.keylesspalace.tusky.NotificationPullJobCreator;
 import com.keylesspalace.tusky.R;
 import com.keylesspalace.tusky.entity.Notification;
 import com.keylesspalace.tusky.receiver.NotificationClearBroadcastReceiver;
@@ -46,10 +46,12 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
-public class NotificationMaker {
+public class NotificationManager {
-    private static final String TAG = "NotificationMaker";
+    private static final String TAG = "NotificationManager";
 
-    /** notification channels used on Android O+ **/
+    /**
+     * notification channels used on Android O+
+     **/
     private static final String CHANNEL_MENTION = "CHANNEL_MENTION";
     private static final String CHANNEL_FOLLOW = "CHANNEL_FOLLOW";
     private static final String CHANNEL_BOOST = "CHANNEL_BOOST";
@@ -102,7 +104,7 @@ public class NotificationMaker {
 
         notificationPreferences.edit()
                 .putString("current", currentNotifications.toString())
-                .commit();
+                .apply();
 
         Intent resultIntent = new Intent(context, MainActivity.class);
         resultIntent.putExtra("tab_position", 1);
@@ -160,16 +162,17 @@ public class NotificationMaker {
             builder.setCategory(android.app.Notification.CATEGORY_SOCIAL);
         }
 
-        NotificationManager notificationManager =
+        android.app.NotificationManager notificationManager = (android.app.NotificationManager)
-                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+                context.getSystemService(Context.NOTIFICATION_SERVICE);
+        //noinspection ConstantConditions
         notificationManager.notify(notifyId, builder.build());
     }
 
     public static void createNotificationChannels(Context context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 
-        NotificationManager mNotificationManager =
+            android.app.NotificationManager mNotificationManager =
-                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+                    (android.app.NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
 
             String[] channelIds = new String[]{CHANNEL_MENTION, CHANNEL_FOLLOW, CHANNEL_BOOST, CHANNEL_FAVOURITE};
             int[] channelNames = {
@@ -191,7 +194,7 @@ public class NotificationMaker {
                 String id = channelIds[i];
                 String name = context.getString(channelNames[i]);
                 String description = context.getString(channelDescriptions[i]);
-                int importance = NotificationManager.IMPORTANCE_DEFAULT;
+                int importance = android.app.NotificationManager.IMPORTANCE_DEFAULT;
                 NotificationChannel channel = new NotificationChannel(id, name, importance);
 
                 channel.setDescription(description);
@@ -201,11 +204,23 @@ public class NotificationMaker {
                 channels.add(channel);
             }
 
+            //noinspection ConstantConditions
             mNotificationManager.createNotificationChannels(channels);
 
         }
     }
 
+    public static void clearNotifications(Context context) {
+        SharedPreferences notificationPreferences =
+                context.getSharedPreferences("Notifications", Context.MODE_PRIVATE);
+        notificationPreferences.edit().putString("current", "[]").apply();
+
+        android.app.NotificationManager manager = (android.app.NotificationManager)
+                context.getSystemService(Context.NOTIFICATION_SERVICE);
+        //noinspection ConstantConditions
+        manager.cancel(NotificationPullJobCreator.NOTIFY_ID);
+    }
+
     private static boolean filterNotification(SharedPreferences preferences,
                                               Notification notification) {
 
@@ -241,6 +256,7 @@ public class NotificationMaker {
 
     }
 
+    @SuppressWarnings("SameParameterValue")
     private static String truncateWithEllipses(String string, int limit) {
         if (string.length() < limit) {
             return string;