All platform code is now internal

 - public APIs live in the *.shared.cs files
 - all platform code is internal or private

Xamarin.Essentials/Accelerometer/Accelerometer.android.cs

@@ -51,15 +51,15 @@ class AccelerometerListener : Java.Lang.Object, ISensorEventListener
         // acceleration due to gravity
         const double gravity = 9.81;
 
-        public AccelerometerListener()
+        internal AccelerometerListener()
         {
         }
 
-        public void OnAccuracyChanged(Sensor sensor, [GeneratedEnum] SensorStatus accuracy)
+        void ISensorEventListener.OnAccuracyChanged(Sensor sensor, [GeneratedEnum] SensorStatus accuracy)
         {
         }
 
-        public void OnSensorChanged(SensorEvent e)
+        void ISensorEventListener.OnSensorChanged(SensorEvent e)
         {
             var data = new AccelerometerData(e.Values[0] / gravity, e.Values[1] / gravity, e.Values[2] / gravity);
             Accelerometer.OnChanged(data);

Xamarin.Essentials/Battery/Battery.android.cs

@@ -30,7 +30,7 @@ static void StopBatteryListeners()
             batteryReceiver = null;
         }
 
-        public static double ChargeLevel
+        static double PlatformChargeLevel
         {
             get
             {
@@ -50,7 +50,7 @@ public static double ChargeLevel
             }
         }
 
-        public static BatteryState State
+        static BatteryState PlatformState
         {
             get
             {
@@ -77,7 +77,7 @@ public static BatteryState State
             }
         }
 
-        public static BatteryPowerSource PowerSource
+        static BatteryPowerSource PlatformPowerSource
         {
             get
             {
@@ -108,11 +108,11 @@ internal class BatteryBroadcastReceiver : BroadcastReceiver
     {
         Action onChanged;
 
-        public BatteryBroadcastReceiver()
+        internal BatteryBroadcastReceiver()
         {
         }
 
-        public BatteryBroadcastReceiver(Action onChanged) =>
+        internal BatteryBroadcastReceiver(Action onChanged) =>
             this.onChanged = onChanged;
 
         public override void OnReceive(Context context, Intent intent) =>

Xamarin.Essentials/Battery/Battery.ios.cs

@@ -27,7 +27,7 @@ static void StopBatteryListeners()
         static void BatteryChangedNotification(object sender, NSNotificationEventArgs args)
             => Platform.BeginInvokeOnMainThread(OnBatteryChanged);
 
-        public static double ChargeLevel
+        static double PlatformChargeLevel
         {
             get
             {
@@ -44,7 +44,7 @@ public static double ChargeLevel
             }
         }
 
-        public static BatteryState State
+        static BatteryState PlatformState
         {
             get
             {
@@ -73,7 +73,7 @@ public static BatteryState State
             }
         }
 
-        public static BatteryPowerSource PowerSource
+        static BatteryPowerSource PlatformPowerSource
         {
             get
             {

Xamarin.Essentials/Battery/Battery.netstandard.cs

@@ -8,13 +8,13 @@ static void StartBatteryListeners() =>
         static void StopBatteryListeners() =>
             throw new NotImplementedInReferenceAssemblyException();
 
-        public static double ChargeLevel =>
+        static double PlatformChargeLevel =>
             throw new NotImplementedInReferenceAssemblyException();
 
-        public static BatteryState State =>
+        static BatteryState PlatformState =>
             throw new NotImplementedInReferenceAssemblyException();
 
-        public static BatteryPowerSource PowerSource =>
+        static BatteryPowerSource PlatformPowerSource =>
             throw new NotImplementedInReferenceAssemblyException();
     }
 }

Xamarin.Essentials/Battery/Battery.shared.cs

@@ -12,6 +12,12 @@ public static partial class Battery
         static BatteryPowerSource currentSource;
         static BatteryState currentState;
 
+        public static double ChargeLevel => PlatformChargeLevel;
+
+        public static BatteryState State => PlatformState;
+
+        public static BatteryPowerSource PowerSource => PlatformPowerSource;
+
         public static event BatteryChangedEventHandler BatteryChanged
         {
             add

Xamarin.Essentials/Battery/Battery.uwp.cs

@@ -14,7 +14,7 @@ static void ReportUpdated(object sender, object e)
         static Windows.Devices.Power.Battery DefaultBattery =>
             Windows.Devices.Power.Battery.AggregateBattery;
 
-        public static double ChargeLevel
+        static double PlatformChargeLevel
         {
             get
             {
@@ -31,7 +31,7 @@ public static double ChargeLevel
             }
         }
 
-        public static BatteryState State
+        static BatteryState PlatformState
         {
             get
             {
@@ -58,7 +58,7 @@ public static BatteryState State
             }
         }
 
-        public static BatteryPowerSource PowerSource
+        static BatteryPowerSource PlatformPowerSource
         {
             get
             {

Xamarin.Essentials/Browser/Browser.android.cs

@@ -10,7 +10,7 @@ namespace Xamarin.Essentials
 {
     public static partial class Browser
     {
-        public static Task OpenAsync(Uri uri, BrowserLaunchType launchType)
+        static Task PlatformOpenAsync(Uri uri, BrowserLaunchType launchType)
         {
             if (uri == null)
                 throw new ArgumentNullException(nameof(uri));

Xamarin.Essentials/Browser/Browser.ios.cs

@@ -7,7 +7,7 @@ namespace Xamarin.Essentials
 {
     public static partial class Browser
     {
-        public static Task OpenAsync(Uri uri, BrowserLaunchType launchType)
+        static Task PlatformOpenAsync(Uri uri, BrowserLaunchType launchType)
         {
             if (uri == null)
                 throw new ArgumentNullException(nameof(uri));

Xamarin.Essentials/Browser/Browser.netstandard.cs

@@ -5,7 +5,7 @@ namespace Xamarin.Essentials
 {
     public static partial class Browser
     {
-        public static Task OpenAsync(Uri uri, BrowserLaunchType launchType) =>
+        static Task PlatformOpenAsync(Uri uri, BrowserLaunchType launchType) =>
             throw new NotImplementedInReferenceAssemblyException();
     }
 }

Xamarin.Essentials/Browser/Browser.shared.cs

@@ -20,6 +20,9 @@ public static Task OpenAsync(string uri, BrowserLaunchType launchType)
 
         public static Task OpenAsync(Uri uri) =>
           OpenAsync(uri, BrowserLaunchType.SystemPreferred);
+
+        public static Task OpenAsync(Uri uri, BrowserLaunchType launchType) =>
+            PlatformOpenAsync(uri, launchType);
     }
 
     public enum BrowserLaunchType

Xamarin.Essentials/Browser/Browser.uwp.cs

@@ -5,7 +5,7 @@ namespace Xamarin.Essentials
 {
     public static partial class Browser
     {
-        public static Task OpenAsync(Uri uri, BrowserLaunchType launchType)
+        static Task PlatformOpenAsync(Uri uri, BrowserLaunchType launchType)
         {
             if (uri == null)
                 throw new ArgumentNullException(nameof(uri));

Xamarin.Essentials/Clipboard/Clipboard.android.cs

@@ -5,13 +5,13 @@ namespace Xamarin.Essentials
 {
     public static partial class Clipboard
     {
-        public static void SetText(string text)
+        static void PlatformSetText(string text)
             => Platform.ClipboardManager.PrimaryClip = ClipData.NewPlainText("Text", text);
 
-        public static bool HasText
+        static bool PlatformHasText
             => Platform.ClipboardManager.HasPrimaryClip;
 
-        public static Task<string> GetTextAsync()
+        static Task<string> PlatformGetTextAsync()
             => Task.FromResult(Platform.ClipboardManager.PrimaryClip?.GetItemAt(0)?.Text);
     }
 }

Xamarin.Essentials/Clipboard/Clipboard.ios.cs

@@ -5,13 +5,13 @@ namespace Xamarin.Essentials
 {
     public static partial class Clipboard
     {
-        public static void SetText(string text)
+        static void PlatformSetText(string text)
             => UIPasteboard.General.String = text;
 
-        public static bool HasText
+        static bool PlatformHasText
             => UIPasteboard.General.HasStrings;
 
-        public static Task<string> GetTextAsync()
+        static Task<string> PlatformGetTextAsync()
             => Task.FromResult(UIPasteboard.General.String);
     }
 }

Xamarin.Essentials/Clipboard/Clipboard.netstandard.cs

@@ -4,13 +4,13 @@ namespace Xamarin.Essentials
 {
     public static partial class Clipboard
     {
-        public static void SetText(string text)
+        static void PlatformSetText(string text)
             => throw new NotImplementedInReferenceAssemblyException();
 
-        public static bool HasText
+        static bool PlatformHasText
             => throw new NotImplementedInReferenceAssemblyException();
 
-        public static Task<string> GetTextAsync()
+        static Task<string> PlatformGetTextAsync()
             => throw new NotImplementedInReferenceAssemblyException();
     }
 }

Xamarin.Essentials/Clipboard/Clipboard.shared.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Threading.Tasks;
+
+namespace Xamarin.Essentials
+{
+    public static partial class Clipboard
+    {
+        public static void SetText(string text)
+            => PlatformSetText(text);
+
+        public static bool HasText
+            => PlatformHasText;
+
+        public static Task<string> GetTextAsync()
+            => PlatformGetTextAsync();
+    }
+}

Xamarin.Essentials/Clipboard/Clipboard.uwp.cs

@@ -8,17 +8,17 @@ namespace Xamarin.Essentials
 {
     public static partial class Clipboard
     {
-        public static void SetText(string text)
+        static void PlatformSetText(string text)
         {
             var dataPackage = new DataPackage();
             dataPackage.SetText(text);
             SetContent(dataPackage);
         }
 
-        public static bool HasText
+        static bool PlatformHasText
             => GetContent().Contains(StandardDataFormats.Text);
 
-        public static Task<string> GetTextAsync()
+        static Task<string> PlatformGetTextAsync()
         {
             var clipboardContent = GetContent();
             return clipboardContent.Contains(StandardDataFormats.Text)

Xamarin.Essentials/Compass/Compass.android.cs

@@ -64,17 +64,17 @@ class SensorListener : Java.Lang.Object, ISensorEventListener, IDisposable
         string magnetometer;
         string accelerometer;
 
-        public SensorListener(string accelerometer, string magnetometer, SensorDelay delay)
+        internal SensorListener(string accelerometer, string magnetometer, SensorDelay delay)
         {
             this.magnetometer = magnetometer;
             this.accelerometer = accelerometer;
         }
 
-        public void OnAccuracyChanged(Sensor sensor, [GeneratedEnum] SensorStatus accuracy)
+        void ISensorEventListener.OnAccuracyChanged(Sensor sensor, [GeneratedEnum] SensorStatus accuracy)
         {
         }
 
-        public void OnSensorChanged(SensorEvent e)
+        void ISensorEventListener.OnSensorChanged(SensorEvent e)
         {
             if (e.Sensor.Name == accelerometer && !lastAccelerometerSet)
             {

Xamarin.Essentials/Connectivity/Connectivity.android.cs

@@ -39,7 +39,7 @@ static void StopListeners()
         static NetworkAccess IsBetterAccess(NetworkAccess currentAccess, NetworkAccess newAccess) =>
             newAccess > currentAccess ? newAccess : currentAccess;
 
-        public static NetworkAccess NetworkAccess
+        static NetworkAccess PlatformNetworkAccess
         {
             get
             {
@@ -110,7 +110,7 @@ void ProcessNetworkInfo(NetworkInfo info)
             }
         }
 
-        public static IEnumerable<ConnectionProfile> Profiles
+        static IEnumerable<ConnectionProfile> PlatformProfiles
         {
             get
             {
@@ -207,11 +207,11 @@ class ConnectivityBroadcastReceiver : BroadcastReceiver
     {
         Action onChanged;
 
-        public ConnectivityBroadcastReceiver()
+        internal ConnectivityBroadcastReceiver()
         {
         }
 
-        public ConnectivityBroadcastReceiver(Action onChanged) =>
+        internal ConnectivityBroadcastReceiver(Action onChanged) =>
             this.onChanged = onChanged;
 
         public override async void OnReceive(Context context, Intent intent)

Xamarin.Essentials/Connectivity/Connectivity.ios.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace Xamarin.Essentials
 {
@@ -22,7 +23,7 @@ static void StopListeners()
             listener = null;
         }
 
-        public static NetworkAccess NetworkAccess
+        static NetworkAccess PlatformNetworkAccess
         {
             get
             {
@@ -38,7 +39,7 @@ public static NetworkAccess NetworkAccess
             }
         }
 
-        public static IEnumerable<ConnectionProfile> Profiles
+        static IEnumerable<ConnectionProfile> PlatformProfiles
         {
             get
             {

Xamarin.Essentials/Connectivity/Connectivity.ios.reachability.cs

@@ -37,7 +37,7 @@ internal static NetworkStatus RemoteHostStatus()
             }
         }
 
-        public static NetworkStatus InternetConnectionStatus()
+        internal static NetworkStatus InternetConnectionStatus()
         {
             var status = NetworkStatus.NotReachable;
 
@@ -124,7 +124,7 @@ class ReachabilityListener : IDisposable
         NetworkReachability defaultRouteReachability;
         NetworkReachability remoteHostReachability;
 
-        public ReachabilityListener()
+        internal ReachabilityListener()
         {
             var ip = new IPAddress(0);
             defaultRouteReachability = new NetworkReachability(ip);
@@ -141,9 +141,11 @@ public ReachabilityListener()
             remoteHostReachability.Schedule(CFRunLoop.Main, CFRunLoop.ModeDefault);
         }
 
-        public event Action ReachabilityChanged;
+        internal event Action ReachabilityChanged;
 
-        public void Dispose()
+        void IDisposable.Dispose() => Dispose();
+
+        internal void Dispose()
         {
             defaultRouteReachability?.Dispose();
             defaultRouteReachability = null;