Replace accept and reject PNGs with vector drawables.

res/drawable/ic_accept_pairing_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M9,16.17L4.83,12l-1.42,1.41L9,19 21,7l-1.41,-1.41z"/>
+</vector>

res/drawable/ic_reject_pairing_24dp.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
+</vector>

src/org/kde/kdeconnect/Device.java

@@ -404,8 +404,8 @@ public class Device implements BaseLink.PacketReceiver {
                 .setContentIntent(pendingIntent)
                 .setTicker(res.getString(R.string.pair_requested))
                 .setSmallIcon(R.drawable.ic_notification)
-                .addAction(R.drawable.ic_accept_pairing, res.getString(R.string.pairing_accept), acceptedPendingIntent)
+                .addAction(R.drawable.ic_accept_pairing_24dp, res.getString(R.string.pairing_accept), acceptedPendingIntent)
-                .addAction(R.drawable.ic_reject_pairing, res.getString(R.string.pairing_reject), rejectedPendingIntent)
+                .addAction(R.drawable.ic_reject_pairing_24dp, res.getString(R.string.pairing_reject), rejectedPendingIntent)
                 .setAutoCancel(true)
                 .setDefaults(Notification.DEFAULT_ALL)
                 .build();

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

@@ -85,7 +85,7 @@ class ReceiveNotification {
         cancelIntent.putExtra(SharePlugin.CANCEL_SHARE_DEVICE_ID_EXTRA, device.getDeviceId());
         PendingIntent cancelPendingIntent = PendingIntent.getBroadcast(device.getContext(), 0, cancelIntent, PendingIntent.FLAG_UPDATE_CURRENT);
 
-        builder.addAction(R.drawable.ic_reject_pairing, device.getContext().getString(R.string.cancel), cancelPendingIntent);
+        builder.addAction(R.drawable.ic_reject_pairing_24dp, device.getContext().getString(R.string.cancel), cancelPendingIntent);
     }
 
     public void setTitle(String title) {

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

@@ -63,7 +63,7 @@ class UploadNotification {
         cancelIntent.putExtra(SharePlugin.CANCEL_SHARE_DEVICE_ID_EXTRA, device.getDeviceId());
         PendingIntent cancelPendingIntent = PendingIntent.getBroadcast(device.getContext(), 0, cancelIntent, PendingIntent.FLAG_UPDATE_CURRENT);
 
-        builder.addAction(R.drawable.ic_reject_pairing, device.getContext().getString(R.string.cancel), cancelPendingIntent);
+        builder.addAction(R.drawable.ic_reject_pairing_24dp, device.getContext().getString(R.string.cancel), cancelPendingIntent);
     }
 
     public void setTitle(String title) {