Recording without GPS: show a Snackbar to warn user that recording is not using GPS.

src/main/res/layout-land/track_recording.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -17,22 +19,29 @@
             android:layout_width="wrap_content"
             android:layout_height="match_parent" />
 
-        <LinearLayout
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:orientation="vertical">
-
-            <com.google.android.material.tabs.TabLayout
-                android:id="@+id/track_detail_activity_tablayout"
+            <LinearLayout
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content" />
+                android:layout_height="match_parent"
+                android:orientation="vertical">
 
-            <androidx.viewpager2.widget.ViewPager2
-                android:id="@+id/track_detail_activity_view_pager"
-                android:layout_width="match_parent"
-                android:layout_height="0dp"
-                android:layout_weight="1" />
+                <com.google.android.material.tabs.TabLayout
+                    android:id="@+id/track_detail_activity_tablayout"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content" />
 
-        </LinearLayout>
+                <androidx.coordinatorlayout.widget.CoordinatorLayout
+                    android:id="@+id/track_recording_coordinator_layout"
+                    android:layout_width="match_parent"
+                    android:layout_height="0dp"
+                    android:layout_weight="1">
+
+                    <androidx.viewpager2.widget.ViewPager2
+                        android:id="@+id/track_detail_activity_view_pager"
+                        android:layout_width="match_parent"
+                        android:layout_height="match_parent"/>
+
+                </androidx.coordinatorlayout.widget.CoordinatorLayout>
+
+            </LinearLayout>
     </LinearLayout>
 </LinearLayout>

src/main/res/layout/statistics_recording.xml

@@ -4,7 +4,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     style="@style/StatsScrollView"
     android:layout_width="match_parent"
-    android:layout_height="wrap_content">
+    android:layout_height="match_parent">
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/stats_recycler_view"
@@ -14,4 +14,4 @@
         app:layout_constraintStart_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>

src/main/res/layout/track_recording.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
@@ -11,15 +13,23 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
 
-    <androidx.viewpager2.widget.ViewPager2
-        android:id="@+id/track_detail_activity_view_pager"
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:id="@+id/track_recording_coordinator_layout"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:layout_weight="1" />
+        android:layout_weight="1">
+
+        <androidx.viewpager2.widget.ViewPager2
+            android:id="@+id/track_detail_activity_view_pager"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/controller_fragment"
         android:name="de.dennisguse.opentracks.ControllerFragment"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
+
 </LinearLayout>

src/main/res/values/colors.xml

@@ -42,4 +42,5 @@ limitations under the License.
     <color name="track_controller_background_activated">#3F0000</color>
 
     <color name="splashscreen_background">#272727</color>
+
 </resources>

src/main/res/values/strings.xml

@@ -244,12 +244,15 @@ limitations under the License.
     <string name="generic_to">To</string>
     <string name="generic_today">Today</string>
     <string name="generic_yesterday">Yesterday</string>
+    <string name="generic_dismiss">Dismiss</string>
     <!-- Gps -->
     <string name="gps_starting">Starting GPS</string>
     <string name="gps_wait_for_better_signal">Waiting for a better GPS signal</string>
     <string name="gps_wait_for_signal">Waiting for GPS signal</string>
     <string name="gps_disabled_msg">GPS disabled</string>
     <string name="gps_fixed_and_ready">GPS fixed and ready</string>
+    <string name="gps_recording_status">%1$s: %2$s</string>
+    <string name="gps_recording_without_signal">OpenTracks is recording without GPS data.</string>
     <!-- Image -->
     <string name="image_arrow">Arrow</string>
     <string name="image_marker">Marker</string>

src/main/res/values/styles.xml

@@ -333,4 +333,29 @@ limitations under the License.
         <item name="cardPreventCornerOverlap">true</item>
         <item name="cardUseCompatPadding">true</item>
     </style>
+
+    <!-- Snackbar -->
+    <style name="MaterialSnackbarTheme" parent="@style/Widget.MaterialComponents.Snackbar">
+        <item name="materialThemeOverlay">@style/ThemeOverlay.App.Snackbar</item>
+        <item name="actionTextColorAlpha">1</item>
+
+        <item name="backgroundTint">@android:color/holo_red_dark</item>
+    </style>
+
+    <style name="MaterialSnackbarTextButtonTheme" parent="@style/Widget.MaterialComponents.Button.TextButton.Snackbar">
+        <item name="android:textColor">@android:color/white</item>
+        <item name="android:textSize">14sp</item>
+    </style>
+
+    <style name="MaterialSnackbarTextViewTheme" parent="@style/Widget.MaterialComponents.Snackbar.TextView">
+        <item name="android:textColor">@android:color/white</item>
+        <item name="android:textAppearance">?textAppearanceLabelMedium</item>
+        <item name="android:textSize">14sp</item>
+    </style>
+
+    <style name="ThemeOverlay.App.Snackbar" parent="">
+        <item name="colorSurface">@android:color/holo_red_dark</item>
+        <item name="colorOnSurface">@android:color/holo_red_dark</item>
+    </style>
+
 </resources>

src/main/res/values/themes_custom.xml

@@ -23,6 +23,12 @@ limitations under the License.
         <item name="android:activatedBackgroundIndicator">@drawable/activated_background</item>
 
         <item name="windowActionModeOverlay">true</item>
+
+        <!-- Snackbar -->
+        <item name="snackbarStyle">@style/MaterialSnackbarTheme</item>
+        <item name="snackbarButtonStyle">@style/MaterialSnackbarTextButtonTheme</item>
+        <item name="snackbarTextViewStyle">@style/MaterialSnackbarTextViewTheme</item>
+
     </style>
 
     <style name="SplashTheme" parent="ThemeCustom">