Add channel to notifications.

Summary:
Oreo requires that each notification has a channel assigned. This patch uses a common channel for all. Individual channels for different notifications (Notifications plugin, pairing notifications, share plugin) could be done, but
since in our case notifications are not a critical part of the UX it does not seem necessary to me. Setting the channel on NotificationCompat.Builder requires version 26 of the support library, the implications of this were
discussed in D8966.

Reviewers: #kde_connect

Subscribers: mtijink, albertvaka, #kde_connect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D9514

build.gradle

@@ -12,9 +12,9 @@ apply plugin: 'com.android.application'
 
 android {
     buildToolsVersion '27.0.3'
-    compileSdkVersion 25
+    compileSdkVersion 27
     defaultConfig {
-        minSdkVersion 9
+        minSdkVersion 16
         targetSdkVersion 25
         //multiDexEnabled true
         //testInstrumentationRunner "com.android.test.runner.MultiDexTestRunner"
@@ -71,9 +71,9 @@ dependencies {
         google()
     }
 
-    implementation 'com.android.support:support-v4:25.4.0'
+    implementation 'com.android.support:support-v4:27.1.1'
-    implementation 'com.android.support:appcompat-v7:25.4.0'
+    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support:design:25.4.0'
+    implementation 'com.android.support:design:27.1.1'
     implementation 'com.jakewharton:disklrucache:2.0.2' //For caching album art bitmaps
 
     implementation 'org.apache.sshd:sshd-core:0.8.0' //0.9 seems to fail on Android 6 and 1.+ requires java.nio.file, which doesn't exist in Android

src/org/kde/kdeconnect/Device.java

@@ -404,7 +404,9 @@ public class Device implements BaseLink.PacketReceiver {
 
         Resources res = getContext().getResources();
 
-        Notification noti = new NotificationCompat.Builder(getContext())
+        final NotificationManager notificationManager = (NotificationManager) getContext().getSystemService(Context.NOTIFICATION_SERVICE);
+
+        Notification noti = new NotificationCompat.Builder(getContext(), NotificationHelper.getDefaultChannelId(notificationManager))
                 .setContentTitle(res.getString(R.string.pairing_request_from, getName()))
                 .setContentText(res.getString(R.string.tap_to_answer))
                 .setContentIntent(pendingIntent)
@@ -416,7 +418,6 @@ public class Device implements BaseLink.PacketReceiver {
                 .setDefaults(Notification.DEFAULT_ALL)
                 .build();
 
-        final NotificationManager notificationManager = (NotificationManager) getContext().getSystemService(Context.NOTIFICATION_SERVICE);
         NotificationHelper.notifyCompat(notificationManager, notificationId, noti);
 
         BackgroundService.addGuiInUseCounter(context);

src/org/kde/kdeconnect/Helpers/NotificationHelper.java

@@ -1,10 +1,13 @@
 package org.kde.kdeconnect.Helpers;
 
 import android.app.Notification;
+import android.app.NotificationChannel;
 import android.app.NotificationManager;
 
 public class NotificationHelper {
 
+    private static NotificationChannel defaultChannel;
+
     public static void notifyCompat(NotificationManager notificationManager, int notificationId, Notification notification) {
         try {
             notificationManager.notify(notificationId, notification);
@@ -22,4 +25,20 @@ public class NotificationHelper {
             //https://android.googlesource.com/platform/frameworks/base/+/android-4.2.1_r1.2%5E%5E!/
         }
     }
+
+    public static String getDefaultChannelId(NotificationManager manager) {
+
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+            if (defaultChannel == null) {
+                String id = "default";
+                CharSequence name = "KDE Connect";
+                int importance = NotificationManager.IMPORTANCE_DEFAULT;
+                defaultChannel = new NotificationChannel(id, name, importance);
+                manager.createNotificationChannel(defaultChannel);
+            }
+            return defaultChannel.getId();
+        }
+        return null;
+    }
+
 }

src/org/kde/kdeconnect/Plugins/PingPlugin/PingPlugin.java

@@ -79,7 +79,9 @@ public class PingPlugin extends Plugin {
             id = 42; //A unique id to create only one notification
         }
 
-        Notification noti = new NotificationCompat.Builder(context)
+        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+
+        Notification noti = new NotificationCompat.Builder(context, NotificationHelper.getDefaultChannelId(notificationManager))
                 .setContentTitle(device.getName())
                 .setContentText(message)
                 .setContentIntent(resultPendingIntent)
@@ -89,7 +91,6 @@ public class PingPlugin extends Plugin {
                 .setDefaults(Notification.DEFAULT_ALL)
                 .build();
 
-        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
         NotificationHelper.notifyCompat(notificationManager, id, noti);
 
         return true;

src/org/kde/kdeconnect/Plugins/ReceiveNotificationsPlugin/ReceiveNotificationsPlugin.java

@@ -105,7 +105,10 @@ public class ReceiveNotificationsPlugin extends Plugin {
                     }
                 }
             }
-            Notification noti = new NotificationCompat.Builder(context)
+
+            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+
+            Notification noti = new NotificationCompat.Builder(context, NotificationHelper.getDefaultChannelId(notificationManager))
                     .setContentTitle(np.getString("appName"))
                     .setContentText(np.getString("ticker"))
                     .setContentIntent(resultPendingIntent)
@@ -117,7 +120,6 @@ public class ReceiveNotificationsPlugin extends Plugin {
                     .setDefaults(Notification.DEFAULT_ALL)
                     .build();
 
-            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
             NotificationHelper.notifyCompat(notificationManager, "kdeconnectId:" + np.getString("id", "0"), np.getInt("id", 0), noti);
 
         }

src/org/kde/kdeconnect/Plugins/SharePlugin/NotificationUpdateCallback.java

@@ -39,8 +39,9 @@ class NotificationUpdateCallback extends Device.SendPacketStatusCallback {
         } else {
             title = res.getString(R.string.outgoing_file_title, device.getName());
         }
-        notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+
-        builder = new NotificationCompat.Builder(context)
+        notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
+        builder = new NotificationCompat.Builder(context, NotificationHelper.getDefaultChannelId(notificationManager))
                 .setSmallIcon(android.R.drawable.stat_sys_upload)
                 .setAutoCancel(true)
                 .setProgress(100, 0, false)

src/org/kde/kdeconnect/Plugins/SharePlugin/ShareNotification.java

@@ -55,7 +55,7 @@ public class ShareNotification {
         this.filename = filename;
         notificationId = (int) System.currentTimeMillis();
         notificationManager = (NotificationManager) device.getContext().getSystemService(Context.NOTIFICATION_SERVICE);
-        builder = new NotificationCompat.Builder(device.getContext())
+        builder = new NotificationCompat.Builder(device.getContext(), NotificationHelper.getDefaultChannelId(notificationManager))
                 .setContentTitle(device.getContext().getResources().getString(R.string.incoming_file_title, device.getName()))
                 .setContentText(device.getContext().getResources().getString(R.string.incoming_file_text, filename))
                 .setTicker(device.getContext().getResources().getString(R.string.incoming_file_title, device.getName()))
@@ -80,7 +80,7 @@ public class ShareNotification {
 
     public void setFinished(boolean success) {
         String message = success ? device.getContext().getResources().getString(R.string.received_file_title, device.getName()) : device.getContext().getResources().getString(R.string.received_file_fail_title, device.getName());
-        builder = new NotificationCompat.Builder(device.getContext());
+        builder = new NotificationCompat.Builder(device.getContext(), NotificationHelper.getDefaultChannelId(notificationManager));
         builder.setContentTitle(message)
                 .setTicker(message)
                 .setSmallIcon(android.R.drawable.stat_sys_download_done)

src/org/kde/kdeconnect/Plugins/SharePlugin/SharePlugin.java

@@ -159,7 +159,9 @@ public class SharePlugin extends Plugin {
                     PendingIntent.FLAG_UPDATE_CURRENT
             );
 
-            Notification noti = new NotificationCompat.Builder(context)
+            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
+
+            Notification noti = new NotificationCompat.Builder(context, NotificationHelper.getDefaultChannelId(notificationManager))
                     .setContentTitle(res.getString(R.string.received_url_title, device.getName()))
                     .setContentText(res.getString(R.string.received_url_text, url))
                     .setContentIntent(resultPendingIntent)
@@ -169,7 +171,6 @@ public class SharePlugin extends Plugin {
                     .setDefaults(Notification.DEFAULT_ALL)
                     .build();
 
-            NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
             NotificationHelper.notifyCompat(notificationManager, (int) System.currentTimeMillis(), noti);
         }
     }