Update notification for Android Oreo

- Add link to notification channel settings
- Remove snooze button

Closes #400

app/src/main/java/org/isoron/uhabits/activities/settings/SettingsFragment.java

@@ -22,12 +22,16 @@ package org.isoron.uhabits.activities.settings;
 import android.app.backup.*;
 import android.content.*;
 import android.os.*;
+import android.provider.*;
 import android.support.v7.preference.*;
 
 import org.isoron.uhabits.R;
 import org.isoron.uhabits.activities.habits.list.*;
+import org.isoron.uhabits.notifications.*;
 import org.isoron.uhabits.utils.*;
 
+import static android.os.Build.VERSION.*;
+
 public class SettingsFragment extends PreferenceFragmentCompat
     implements SharedPreferences.OnSharedPreferenceChangeListener
 {
@@ -61,6 +65,14 @@ public class SettingsFragment extends PreferenceFragmentCompat
         setResultOnPreferenceClick("bugReport", ListHabitsScreen.RESULT_BUG_REPORT);
 
         updateRingtoneDescription();
+
+        if (SDK_INT < Build.VERSION_CODES.O)
+            findPreference("reminderCustomize").setVisible(false);
+        else
+        {
+            findPreference("reminderSound").setVisible(false);
+            findPreference("pref_snooze_interval").setVisible(false);
+        }
     }
 
     @Override
@@ -88,6 +100,17 @@ public class SettingsFragment extends PreferenceFragmentCompat
                 RINGTONE_REQUEST_CODE);
             return true;
         }
+        else if (key.equals("reminderCustomize"))
+        {
+            if (SDK_INT < Build.VERSION_CODES.O) return true;
+
+            NotificationTray.createAndroidNotificationChannel(getContext());
+            Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
+            intent.putExtra(Settings.EXTRA_APP_PACKAGE, getContext().getPackageName());
+            intent.putExtra(Settings.EXTRA_CHANNEL_ID, NotificationTray.REMINDERS_CHANNEL_ID);
+            startActivity(intent);
+            return true;
+        }
 
         return super.onPreferenceTreeClick(preference);
     }

app/src/main/java/org/isoron/uhabits/notifications/NotificationTray.java

@@ -22,6 +22,7 @@ package org.isoron.uhabits.notifications;
 import android.app.*;
 import android.content.*;
 import android.graphics.*;
+import android.os.*;
 import android.support.annotation.*;
 import android.support.v4.app.*;
 import android.support.v4.app.NotificationCompat.*;
@@ -39,12 +40,15 @@ import java.util.*;
 import javax.inject.*;
 
 import static android.graphics.BitmapFactory.*;
+import static android.os.Build.VERSION.*;
 import static org.isoron.uhabits.utils.RingtoneUtils.*;
 
 @AppScope
 public class NotificationTray
     implements CommandRunner.Listener, Preferences.Listener
 {
+    public static final String REMINDERS_CHANNEL_ID = "REMINDERS";
+
     @NonNull
     private final Context context;
 
@@ -196,10 +200,6 @@ public class NotificationTray
                 context.getString(R.string.check),
                 pendingIntents.addCheckmark(habit, timestamp));
 
-            Action snoozeAction = new Action(R.drawable.ic_action_snooze,
-                context.getString(R.string.snooze),
-                pendingIntents.snoozeNotification(habit));
-
             Bitmap wearableBg =
                 decodeResource(context.getResources(), R.drawable.stripe);
 
@@ -208,30 +208,38 @@ public class NotificationTray
             // WearableExtender.
             WearableExtender wearableExtender = new WearableExtender()
                 .setBackground(wearableBg)
-                .addAction(checkAction)
+                .addAction(checkAction);
-                .addAction(snoozeAction);
 
-            Notification notification = new NotificationCompat.Builder(context)
+            Builder builder = new Builder(context, REMINDERS_CHANNEL_ID)
                 .setSmallIcon(R.drawable.ic_notification)
                 .setContentTitle(habit.getName())
                 .setContentText(habit.getDescription())
                 .setContentIntent(pendingIntents.showHabit(habit))
                 .setDeleteIntent(pendingIntents.dismissNotification(habit))
                 .addAction(checkAction)
-                .addAction(snoozeAction)
                 .setSound(getRingtoneUri(context))
-                .extend(wearableExtender)
                 .setWhen(reminderTime)
                 .setShowWhen(true)
-                .setOngoing(preferences.shouldMakeNotificationsSticky())
+                .setOngoing(preferences.shouldMakeNotificationsSticky());
-                .build();
+
+            if(SDK_INT < Build.VERSION_CODES.O) {
+                Action snoozeAction = new Action(R.drawable.ic_action_snooze,
+                    context.getString(R.string.snooze),
+                    pendingIntents.snoozeNotification(habit));
+
+                wearableExtender.addAction(snoozeAction);
+                builder.addAction(snoozeAction);
+            }
+
+            builder.extend(wearableExtender);
 
             NotificationManager notificationManager =
                 (NotificationManager) context.getSystemService(
                     Activity.NOTIFICATION_SERVICE);
 
+            createAndroidNotificationChannel(context);
             int notificationId = getNotificationId(habit);
-            notificationManager.notify(notificationId, notification);
+            notificationManager.notify(notificationId, builder.build());
         }
 
         private boolean shouldShowReminderToday()
@@ -245,4 +253,19 @@ public class NotificationTray
             return reminderDays[weekday];
         }
     }
+
+    public static void createAndroidNotificationChannel(Context context) {
+        NotificationManager notificationManager =
+            (NotificationManager) context.getSystemService(
+                Activity.NOTIFICATION_SERVICE);
+
+        if (SDK_INT >= Build.VERSION_CODES.O)
+        {
+            NotificationChannel channel =
+                new NotificationChannel(REMINDERS_CHANNEL_ID,
+                    context.getResources().getString(R.string.reminder),
+                    NotificationManager.IMPORTANCE_DEFAULT);
+            notificationManager.createNotificationChannel(channel);
+        }
+    }
 }

app/src/main/res/values/strings.xml

@@ -204,4 +204,6 @@
     <string name="by_score">By score</string>
     <string name="download">Download</string>
     <string name="export">Export</string>
+    <string name="customize_notification_summary">Change sound, vibration, light and other notification settings</string>
+    <string name="customize_notification">Customize notifications</string>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -68,6 +68,11 @@
             android:title="@string/sticky_notifications"
             android:summary="@string/sticky_notifications_description"/>
 
+        <Preference
+            android:key="reminderCustomize"
+            android:summary="@string/customize_notification_summary"
+            android:title="@string/customize_notification"/>
+
     </PreferenceCategory>
 
     <PreferenceCategory