Hopefully fixed the "transparent notification bug" for Samsung (TouchWiz) devices.

app/src/main/res/layout/notification.xml

@@ -14,21 +14,31 @@
   ~ limitations under the License
   -->
 
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:internal="http://schemas.android.com/apk/prv/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/root"
-    android:layout_width="match_parent"
-    android:layout_height="64dp"
-    android:background="#00000000"
-    android:orientation="horizontal"
-    internal:layout_maxHeight="64dp"
-    internal:layout_minHeight="64dp"
-    tools:ignore="DisableBaselineAlignment">
-
+<!--This FrameLayout IS necessary in order tp prevent fucking TouchWiz to interpret the "background="#00000000" as making the whole notification transparent-->
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:internal="http://schemas.android.com/apk/prv/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="64dp"
+    internal:layout_maxHeight="64dp"
+    internal:layout_minHeight="64dp">
+
+    <LinearLayout
+        android:id="@+id/root"
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:internal="http://schemas.android.com/apk/prv/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#00000000"
+        android:baselineAligned="false"
+        android:orientation="horizontal"
+        tools:ignore="UselessParent">
+
+        <FrameLayout
             android:id="@+id/icon_group"
+            xmlns:android="http://schemas.android.com/apk/res/android"
+            xmlns:internal="http://schemas.android.com/apk/prv/res/android"
             android:layout_width="@dimen/notification_large_icon_width"
             android:layout_height="@dimen/notification_large_icon_height"
             android:layout_weight="0">
@@ -90,9 +100,10 @@
             android:orientation="horizontal"
             tools:ignore="UnusedAttribute">
             <!-- media buttons will be added here -->
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_prev"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -105,9 +116,10 @@
                 android:src="@drawable/ic_skip_previous_white_36dp"
                 tools:ignore="ContentDescription" />
 
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_play_pause"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -120,9 +132,10 @@
                 android:src="@drawable/ic_play_arrow_white_36dp"
                 tools:ignore="ContentDescription" />
 
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_next"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -136,3 +149,4 @@
                 tools:ignore="ContentDescription" />
         </LinearLayout>
     </LinearLayout>
+</FrameLayout>

app/src/main/res/layout/notification_big.xml

@@ -15,13 +15,20 @@
   -->
 
 <!-- Layout to be used with only max 3 actions. It has a much larger picture at the left side-->
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+
+<!--This FrameLayout IS necessary in order tp prevent fucking TouchWiz to interpret the "background="#00000000" as making the whole notification transparent-->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/root"
-    android:background="#00000000"
     android:layout_width="match_parent"
     android:layout_height="128dp">
 
+    <RelativeLayout
+        android:id="@+id/root"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="#00000000"
+        tools:ignore="UselessParent">
+
         <ImageView
             android:id="@+id/icon"
             android:layout_width="@dimen/notification_big_image_size"
@@ -29,9 +36,10 @@
             android:scaleType="centerCrop"
             tools:ignore="ContentDescription" />
 
-    <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+        <ImageButton
             android:id="@+id/action_quit"
             style="@style/Widget.AppCompat.Button.Borderless"
+            xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="36dp"
             android:layout_height="36dp"
             android:layout_alignParentEnd="true"
@@ -108,9 +116,10 @@
             android:orientation="horizontal"
             tools:ignore="UnusedAttribute">
             <!-- media buttons will be added here -->
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_prev"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -123,9 +132,10 @@
                 android:src="@drawable/ic_skip_previous_white_36dp"
                 tools:ignore="ContentDescription" />
 
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_play_pause"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -138,9 +148,10 @@
                 android:src="@drawable/ic_play_arrow_white_36dp"
                 tools:ignore="ContentDescription" />
 
-        <ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
+            <ImageButton
                 android:id="@+id/action_next"
                 style="@style/Widget.AppCompat.Button.Borderless"
+                xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="48dp"
                 android:layout_height="match_parent"
                 android:layout_marginLeft="2dp"
@@ -154,3 +165,4 @@
                 tools:ignore="ContentDescription" />
         </LinearLayout>
     </RelativeLayout>
+</FrameLayout>