Version bump

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/build.gradle

@@ -20,8 +20,8 @@ android {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode 419
-        versionName '0.0.20180529'
+        versionCode 420
+        versionName '0.0.20180601'
     }
     externalNativeBuild {
         cmake {

app/src/main/java/com/wireguard/android/Application.java

@@ -12,6 +12,7 @@ import android.os.AsyncTask;
 import android.os.Handler;
 import android.os.Looper;
 import android.preference.PreferenceManager;
+import android.support.v7.app.AppCompatDelegate;
 
 import com.wireguard.android.backend.Backend;
 import com.wireguard.android.backend.GoBackend;
@@ -22,6 +23,7 @@ import com.wireguard.android.model.TunnelManager;
 import com.wireguard.android.util.AsyncWorker;
 import com.wireguard.android.util.RootShell;
 import com.wireguard.android.util.ToolsInstaller;
+import com.wireguard.android.util.Topic;
 
 import java.io.File;
 import java.util.concurrent.Executor;
@@ -66,6 +68,8 @@ public class Application extends android.app.Application {
         ToolsInstaller getToolsInstaller();
 
         TunnelManager getTunnelManager();
+
+        Topic getThemeChangeTopic();
     }
 
     @Qualifier
@@ -86,6 +90,10 @@ public class Application extends android.app.Application {
 
         private ApplicationModule(final Application application) {
             context = application.getApplicationContext();
+
+            AppCompatDelegate.setDefaultNightMode(
+                    getPreferences(context).getBoolean("dark_theme", false) ?
+                          AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
         }
 
         @ApplicationScope
@@ -111,6 +119,12 @@ public class Application extends android.app.Application {
             return new FileConfigStore(context);
         }
 
+        @ApplicationScope
+        @Provides
+        public static Topic getThemeChangeTopic() {
+            return new Topic();
+        }
+
 
         @ApplicationScope
         @Provides

app/src/main/java/com/wireguard/android/activity/BaseActivity.java

@@ -11,19 +11,24 @@ import android.databinding.CallbackRegistry;
 import android.databinding.CallbackRegistry.NotifierCallback;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
 
 import com.wireguard.android.Application;
 import com.wireguard.android.backend.GoBackend;
 import com.wireguard.android.model.Tunnel;
 import com.wireguard.android.model.TunnelManager;
+import com.wireguard.android.util.Topic;
 
+import java.lang.reflect.Field;
 import java.util.Objects;
 
 /**
  * Base class for activities that need to remember the currently-selected tunnel.
  */
 
-public abstract class BaseActivity extends AppCompatActivity {
+public abstract class BaseActivity extends AppCompatActivity implements Topic.Subscriber {
+    private static final String TAG = "WireGuard/" + BaseActivity.class.getSimpleName();
+
     private static final String KEY_SELECTED_TUNNEL = "selected_tunnel";
 
     private final SelectionChangeRegistry selectionChangeRegistry = new SelectionChangeRegistry();
@@ -40,6 +45,8 @@ public abstract class BaseActivity extends AppCompatActivity {
 
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
+        subscribeTopics();
+
         // Restore the saved tunnel if there is one; otherwise grab it from the arguments.
         String savedTunnelName = null;
         if (savedInstanceState != null)
@@ -62,6 +69,12 @@ public abstract class BaseActivity extends AppCompatActivity {
         }
     }
 
+    @Override
+    protected void onDestroy() {
+        unsubscribeTopics();
+        super.onDestroy();
+    }
+
     @Override
     protected void onSaveInstanceState(final Bundle outState) {
         if (selectedTunnel != null)
@@ -105,4 +118,28 @@ public abstract class BaseActivity extends AppCompatActivity {
             super(new SelectionChangeNotifier());
         }
     }
+
+    @Override
+    public void onTopicPublished(Topic topic) {
+        try {
+            Field f = getResources().getClass().getDeclaredField("mResourcesImpl");
+            f.setAccessible(true);
+            Object o = f.get(getResources());
+            f = o.getClass().getDeclaredField("mDrawableCache");
+            f.setAccessible(true);
+            o = f.get(o);
+            f = o.getClass().getSuperclass().getDeclaredField("mThemedEntries");
+            f.setAccessible(true);
+            o = f.get(o);
+            o.getClass().getMethod("clear").invoke(o);
+        } catch (Exception e) {
+            Log.e(TAG, "Failed to flush icon cache", e);
+        }
+        recreate();
+    }
+
+    @Override
+    public Topic[] getSubscription() {
+        return new Topic[] { Application.getComponent().getThemeChangeTopic() };
+    }
 }

app/src/main/java/com/wireguard/android/activity/SettingsActivity.java

@@ -6,12 +6,14 @@
 
 package com.wireguard.android.activity;
 
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.app.AppCompatDelegate;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceFragmentCompat;
 import android.view.MenuItem;
@@ -19,6 +21,7 @@ import android.view.MenuItem;
 import com.wireguard.android.Application;
 import com.wireguard.android.R;
 import com.wireguard.android.backend.WgQuickBackend;
+import com.wireguard.android.util.Topic;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -30,7 +33,7 @@ import java.util.Map;
  * Interface for changing application-global persistent settings.
  */
 
-public class SettingsActivity extends AppCompatActivity {
+public class SettingsActivity extends AppCompatActivity implements Topic.Subscriber {
     private final Map<Integer, PermissionRequestCallback> permissionRequestCallbacks = new HashMap<>();
     private int permissionRequestCounter;
 
@@ -56,6 +59,7 @@ public class SettingsActivity extends AppCompatActivity {
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        subscribeTopics();
         if (getSupportFragmentManager().findFragmentById(android.R.id.content) == null) {
             getSupportFragmentManager().beginTransaction()
                     .add(android.R.id.content, new SettingsFragment())
@@ -63,6 +67,12 @@ public class SettingsActivity extends AppCompatActivity {
         }
     }
 
+    @Override
+    protected void onDestroy() {
+        unsubscribeTopics();
+        super.onDestroy();
+    }
+
     @Override
     public boolean onOptionsItemSelected(final MenuItem item) {
         switch (item.getItemId()) {
@@ -89,7 +99,17 @@ public class SettingsActivity extends AppCompatActivity {
         void done(String[] permissions, int[] grantResults);
     }
 
-    public static class SettingsFragment extends PreferenceFragmentCompat {
+    @Override
+    public void onTopicPublished(Topic topic) {
+        recreate();
+    }
+
+    @Override
+    public Topic[] getSubscription() {
+        return new Topic[] { Application.getComponent().getThemeChangeTopic() };
+    }
+
+    public static class SettingsFragment extends PreferenceFragmentCompat implements SharedPreferences.OnSharedPreferenceChangeListener {
         @Override
         public void onCreatePreferences(final Bundle savedInstanceState, final String key) {
             addPreferencesFromResource(R.xml.preferences);
@@ -100,5 +120,26 @@ public class SettingsActivity extends AppCompatActivity {
                 getPreferenceScreen().removePreference(pref);
             }
         }
+
+        @Override
+        public void onResume() {
+            super.onResume();
+            getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+        }
+
+        @Override
+        public void onPause() {
+            getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+            super.onPause();
+        }
+
+        @Override
+        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+            if ("dark_theme".equals(key)) {
+                AppCompatDelegate.setDefaultNightMode(
+                        sharedPreferences.getBoolean(key, false) ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
+                Application.getComponent().getThemeChangeTopic().publish(false);
+            }
+        }
     }
 }

app/src/main/java/com/wireguard/android/backend/GoBackend.java

@@ -56,6 +56,10 @@ public final class GoBackend implements Backend {
 
     private static native int wgTurnOn(String ifName, int tunFd, String settings);
 
+    private static native String wgVersion();
+
+    public static String getVersion() { return wgVersion(); }
+
     @Override
     public Config applyConfig(final Tunnel tunnel, final Config config) throws Exception {
         if (tunnel.getState() == State.UP) {

app/src/main/java/com/wireguard/android/fragment/TunnelListFragment.java

@@ -343,7 +343,11 @@ public class TunnelListFragment extends BaseFragment {
 
         private void updateTitle(final ActionMode mode) {
             final int count = (int) getCheckedPositions().count();
-            mode.setTitle(resources.getQuantityString(R.plurals.delete_title, count, count));
+            if (count == 0) {
+                mode.setTitle("");
+            } else {
+                mode.setTitle(resources.getQuantityString(R.plurals.delete_title, count, count));
+            }
         }
     }
 

app/src/main/java/com/wireguard/android/preference/VersionPreference.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.preference;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.support.v7.preference.Preference;
+import android.util.AttributeSet;
+
+import com.wireguard.android.Application;
+import com.wireguard.android.BuildConfig;
+import com.wireguard.android.R;
+import com.wireguard.android.backend.GoBackend;
+import com.wireguard.android.backend.WgQuickBackend;
+
+public class VersionPreference extends Preference {
+    private String versionSummary;
+
+    public VersionPreference(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+
+        if (Application.getComponent().getBackendType() == GoBackend.class) {
+            versionSummary = getContext().getString(R.string.version_userspace_summary, GoBackend.getVersion());
+        } else if (Application.getComponent().getBackendType() == WgQuickBackend.class) {
+            Application.getComponent().getToolsInstaller().getVersion().whenComplete((version, exception) -> {
+                if (exception == null)
+                    versionSummary = getContext().getString(R.string.version_kernel_summary, version);
+                else
+                    versionSummary = getContext().getString(R.string.version_kernel_unknown_summary);
+                notifyChanged();
+            });
+        }
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return versionSummary;
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return getContext().getString(R.string.version_title, BuildConfig.VERSION_NAME);
+    }
+
+    @Override
+    protected void onClick() {
+        final Intent intent = new Intent(Intent.ACTION_VIEW);
+        intent.setData(Uri.parse("https://www.wireguard.com/"));
+        getContext().startActivity(intent);
+    }
+
+}

app/src/main/java/com/wireguard/android/util/ToolsInstaller.java

@@ -10,6 +10,7 @@ import android.content.Context;
 import android.system.OsConstants;
 import android.util.Log;
 
+import com.wireguard.android.Application;
 import com.wireguard.android.Application.ApplicationContext;
 import com.wireguard.android.Application.ApplicationScope;
 import com.wireguard.android.util.RootShell.NoRootException;
@@ -17,11 +18,14 @@ import com.wireguard.android.util.RootShell.NoRootException;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
 import javax.inject.Inject;
 
+import java9.util.concurrent.CompletionStage;
+
 /**
  * Helper to install WireGuard tools to the system partition.
  */
@@ -52,14 +56,24 @@ public final class ToolsInstaller {
         this.rootShell = rootShell;
     }
 
+    public CompletionStage<String> getVersion() {
+        return Application.getComponent().getAsyncWorker().supplyAsync(() -> {
+            final ArrayList<String> output = new ArrayList<>();
+            if (rootShell.run(output, "cat /sys/module/wireguard/version") != 0 || output.isEmpty())
+                throw new RuntimeException("Unable to determine kernel module version");
+            return output.get(0);
+        });
+    }
+
     private static File getInstallDir() {
         final String path = System.getenv("PATH");
         if (path == null)
             return INSTALL_DIRS[0];
         final List<String> paths = Arrays.asList(path.split(":"));
-        for (final File dir : INSTALL_DIRS)
+        for (final File dir : INSTALL_DIRS) {
             if (paths.contains(dir.getPath()) && dir.isDirectory())
                 return dir;
+        }
         return null;
     }
 

app/src/main/java/com/wireguard/android/util/Topic.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright © 2017 John Wu <topjohnwu@gmail.com>
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.util;
+
+import java.lang.ref.WeakReference;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Topic {
+
+    private static final int NON_INIT = 0;
+    private static final int PENDING = 1;
+    private static final int PUBLISHED = 2;
+
+    private int state = NON_INIT;
+    private List<WeakReference<Subscriber>> subscribers;
+    private Object[] results;
+
+    public void subscribe(Subscriber sub) {
+        if (subscribers == null) {
+            subscribers = new LinkedList<>();
+        }
+        synchronized (subscribers) {
+            subscribers.add(new WeakReference<>(sub));
+        }
+    }
+
+    public void unsubscribe() {
+        subscribers = null;
+    }
+
+    public void unsubscribe(Subscriber sub) {
+        synchronized (subscribers) {
+            for (Iterator<WeakReference<Subscriber>> i = subscribers.iterator(); i.hasNext(); ) {
+                WeakReference<Subscriber> subscriber = i.next();
+                if (subscriber.get() == null || subscriber.get() == sub) {
+                    i.remove();
+                }
+            }
+        }
+    }
+
+    public void reset() {
+        state = NON_INIT;
+        results = null;
+    }
+
+    public boolean isPublished() {
+        return state == PUBLISHED;
+    }
+
+    public void publish() {
+        publish(true);
+    }
+
+    public void publish(boolean record, Object... results) {
+        if (record)
+            state = PUBLISHED;
+        this.results = results;
+        if (subscribers != null) {
+            List<WeakReference<Subscriber>> subscribersCopy = new LinkedList<>();
+            synchronized (subscribers) {
+                subscribersCopy.addAll(subscribers);
+            }
+            for (WeakReference<Subscriber> subscriber : subscribersCopy) {
+                if (subscriber.get() != null)
+                    subscriber.get().onTopicPublished(this);
+            }
+        }
+    }
+
+    public Object[] getResults() {
+        return results;
+    }
+
+    public boolean isPending() {
+        return state == PENDING;
+    }
+
+    public void setPending() {
+        state = PENDING;
+    }
+
+    public interface Subscriber {
+        default void subscribeTopics() {
+            for (Topic topic : getSubscription()) {
+                if (topic.isPublished()) {
+                    onTopicPublished(topic);
+                }
+                topic.subscribe(this);
+            }
+        }
+
+        default void unsubscribeTopics() {
+            for (Topic event : getSubscription()) {
+                event.unsubscribe(this);
+            }
+        }
+
+        void onTopicPublished(Topic topic);
+
+        Topic[] getSubscription();
+    }
+}

app/src/main/java/com/wireguard/android/widget/fab/AddFloatingActionButton.java

@@ -16,6 +16,7 @@ import android.graphics.drawable.ShapeDrawable;
 import android.graphics.drawable.shapes.Shape;
 import android.support.annotation.ColorRes;
 import android.support.annotation.DrawableRes;
+import android.support.v4.content.ContextCompat;
 import android.util.AttributeSet;
 
 import com.wireguard.android.R;
@@ -38,7 +39,7 @@ public class AddFloatingActionButton extends FloatingActionButton {
     @Override
     void init(final Context context, final AttributeSet attributeSet) {
         final TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.AddFloatingActionButton, 0, 0);
-        mPlusColor = attr.getColor(R.styleable.AddFloatingActionButton_fab_plusIconColor, getColor(android.R.color.white));
+        mPlusColor = attr.getColor(R.styleable.AddFloatingActionButton_fab_plusIconColor, FloatingActionButton.getColorFromTheme(context, android.R.attr.colorBackground, android.R.color.white));
         attr.recycle();
 
         super.init(context, attributeSet);
@@ -58,8 +59,8 @@ public class AddFloatingActionButton extends FloatingActionButton {
         }
     }
 
-    public void setPlusColorResId(@ColorRes int plusColor) {
-        setPlusColor(getColor(plusColor));
+    public void setPlusColorResId(@ColorRes final int plusColor) {
+        setPlusColor(ContextCompat.getColor(getContext(), plusColor));
     }
 
     @Override

app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButton.java

@@ -7,6 +7,7 @@
 package com.wireguard.android.widget.fab;
 
 import android.content.Context;
+import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.graphics.*;
 import android.graphics.Paint.Style;
@@ -15,8 +16,10 @@ import android.graphics.drawable.*;
 import android.graphics.drawable.ShapeDrawable.ShaderFactory;
 import android.graphics.drawable.shapes.OvalShape;
 import android.support.annotation.*;
+import android.support.v4.content.ContextCompat;
 import android.support.v7.widget.AppCompatImageButton;
 import android.util.AttributeSet;
+import android.util.TypedValue;
 import android.widget.TextView;
 
 import com.wireguard.android.R;
@@ -51,16 +54,29 @@ public class FloatingActionButton extends AppCompatImageButton {
         init(context, attrs);
     }
 
-    public FloatingActionButton(Context context, AttributeSet attrs, int defStyle) {
+    public FloatingActionButton(final Context context, final AttributeSet attrs, final int defStyle) {
         super(context, attrs, defStyle);
         init(context, attrs);
     }
 
+    public static int getColorFromTheme(final Context context, final int themeResource, @ColorRes final int fallback) {
+        final TypedValue typedValue = new TypedValue();
+        final Resources.Theme theme = context.getTheme();
+        theme.resolveAttribute(themeResource, typedValue, true);
+        @ColorInt final int color = typedValue.data;
+        return color == 0 ? fallback : color;
+
+    }
+
     void init(final Context context, final AttributeSet attributeSet) {
-        final TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.FloatingActionButton, 0, 0);
-        mColorNormal = attr.getColor(R.styleable.FloatingActionButton_fab_colorNormal, getColor(android.R.color.holo_blue_dark));
-        mColorPressed = attr.getColor(R.styleable.FloatingActionButton_fab_colorPressed, getColor(android.R.color.holo_blue_light));
-        mColorDisabled = attr.getColor(R.styleable.FloatingActionButton_fab_colorDisabled, getColor(android.R.color.darker_gray));
+        final TypedArray attr = context.obtainStyledAttributes(attributeSet,
+                R.styleable.FloatingActionButton, 0, 0);
+        mColorNormal = attr.getColor(R.styleable.FloatingActionButton_fab_colorNormal,
+                getColorFromTheme(context, android.R.attr.colorAccent, android.R.color.holo_blue_bright));
+        mColorPressed = attr.getColor(R.styleable.FloatingActionButton_fab_colorPressed,
+                darkenOrLightenColor(mColorNormal)); //TODO(msf): use getColorForState on the accent color from theme instead to get darker states
+        mColorDisabled = attr.getColor(R.styleable.FloatingActionButton_fab_colorDisabled,
+                ContextCompat.getColor(context, android.R.color.darker_gray)); //TODO(msf): load from theme
         mSize = attr.getInt(R.styleable.FloatingActionButton_fab_size, SIZE_NORMAL);
         mIcon = attr.getResourceId(R.styleable.FloatingActionButton_fab_icon, 0);
         mTitle = attr.getString(R.styleable.FloatingActionButton_fab_title);
@@ -124,7 +140,7 @@ public class FloatingActionButton extends AppCompatImageButton {
     }
 
     public void setColorNormalResId(@ColorRes final int colorNormal) {
-        setColorNormal(getColor(colorNormal));
+        setColorNormal(ContextCompat.getColor(getContext(), colorNormal));
     }
 
     /**
@@ -142,7 +158,7 @@ public class FloatingActionButton extends AppCompatImageButton {
     }
 
     public void setColorPressedResId(@ColorRes final int colorPressed) {
-        setColorPressed(getColor(colorPressed));
+        setColorPressed(ContextCompat.getColor(getContext(), colorPressed));
     }
 
     /**
@@ -160,7 +176,7 @@ public class FloatingActionButton extends AppCompatImageButton {
     }
 
     public void setColorDisabledResId(@ColorRes final int colorDisabled) {
-        setColorDisabled(getColor(colorDisabled));
+        setColorDisabled(ContextCompat.getColor(getContext(), colorDisabled));
     }
 
     public boolean isStrokeVisible() {
@@ -174,10 +190,6 @@ public class FloatingActionButton extends AppCompatImageButton {
         }
     }
 
-    int getColor(@ColorRes final int id) {
-        return getResources().getColor(id);
-    }
-
     float getDimension(@DimenRes final int id) {
         return getResources().getDimension(id);
     }
@@ -247,7 +259,7 @@ public class FloatingActionButton extends AppCompatImageButton {
         if (mIconDrawable != null) {
             return mIconDrawable;
         } else if (mIcon != 0) {
-            return getResources().getDrawable(mIcon, null);
+            return ContextCompat.getDrawable(getContext(), mIcon);
         } else {
             return new ColorDrawable(Color.TRANSPARENT);
         }
@@ -294,7 +306,7 @@ public class FloatingActionButton extends AppCompatImageButton {
         return drawable;
     }
 
-    private Drawable createOuterStrokeDrawable(final float strokeWidth) {
+    private static Drawable createOuterStrokeDrawable(final float strokeWidth) {
         final ShapeDrawable shapeDrawable = new ShapeDrawable(new OvalShape());
 
         final Paint paint = shapeDrawable.getPaint();
@@ -307,19 +319,32 @@ public class FloatingActionButton extends AppCompatImageButton {
         return shapeDrawable;
     }
 
-    private int opacityToAlpha(final float opacity) {
+    private static int opacityToAlpha(final float opacity) {
         return (int) (255f * opacity);
     }
 
-    private int darkenColor(final int argb) {
+    private static int darkenColor(final int argb) {
         return adjustColorBrightness(argb, 0.9f);
     }
 
-    private int lightenColor(final int argb) {
+    private static int lightenColor(final int argb) {
         return adjustColorBrightness(argb, 1.1f);
     }
 
-    private int adjustColorBrightness(final int argb, final float factor) {
+    public static int darkenOrLightenColor(final int argb) {
+        final float[] hsv = new float[3];
+        Color.colorToHSV(argb, hsv);
+        final float factor;
+        if (hsv[2] < 0.2)
+            factor = 1.2f;
+        else
+            factor = 0.8f;
+
+        hsv[2] = Math.min(hsv[2] * factor, 1f);
+        return Color.HSVToColor(Color.alpha(argb), hsv);
+    }
+
+    private static int adjustColorBrightness(final int argb, final float factor) {
         final float[] hsv = new float[3];
         Color.colorToHSV(argb, hsv);
 
@@ -328,7 +353,7 @@ public class FloatingActionButton extends AppCompatImageButton {
         return Color.HSVToColor(Color.alpha(argb), hsv);
     }
 
-    private int halfTransparent(final int argb) {
+    private static int halfTransparent(final int argb) {
         return Color.argb(
                 Color.alpha(argb) / 2,
                 Color.red(argb),
@@ -337,7 +362,7 @@ public class FloatingActionButton extends AppCompatImageButton {
         );
     }
 
-    private int opaque(final int argb) {
+    private static int opaque(final int argb) {
         return Color.rgb(
                 Color.red(argb),
                 Color.green(argb),
@@ -390,10 +415,10 @@ public class FloatingActionButton extends AppCompatImageButton {
     public @interface FAB_SIZE {
     }
 
-    private static class TranslucentLayerDrawable extends LayerDrawable {
+    private static final class TranslucentLayerDrawable extends LayerDrawable {
         private final int mAlpha;
 
-        public TranslucentLayerDrawable(final int alpha, final Drawable... layers) {
+        private TranslucentLayerDrawable(final int alpha, final Drawable... layers) {
             super(layers);
             mAlpha = alpha;
         }

app/src/main/java/com/wireguard/android/widget/fab/FloatingActionsMenu.java

@@ -10,28 +10,33 @@ import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.LayerDrawable;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.support.annotation.ColorRes;
+import android.support.annotation.Keep;
 import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.AppCompatTextView;
 import android.util.AttributeSet;
 import android.view.ContextThemeWrapper;
 import android.view.TouchDelegate;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.DecelerateInterpolator;
-import android.view.animation.Interpolator;
 import android.view.animation.OvershootInterpolator;
 import android.widget.TextView;
 
 import com.wireguard.android.R;
 
+@SuppressWarnings("ReturnOfInnerClass")
 public class FloatingActionsMenu extends ViewGroup {
     public static final int EXPAND_UP = 0;
     public static final int EXPAND_DOWN = 1;
@@ -44,9 +49,9 @@ public class FloatingActionsMenu extends ViewGroup {
     private static final int ANIMATION_DURATION = 300;
     private static final float COLLAPSED_PLUS_ROTATION = 0f;
     private static final float EXPANDED_PLUS_ROTATION = 90f + 45f;
-    private static final Interpolator sExpandInterpolator = new OvershootInterpolator();
-    private static final Interpolator sCollapseInterpolator = new DecelerateInterpolator(3f);
-    private static final Interpolator sAlphaExpandInterpolator = new DecelerateInterpolator();
+    private static final TimeInterpolator EXPAND_INTERPOLATOR = new OvershootInterpolator();
+    private static final TimeInterpolator COLLAPSE_INTERPOLATOR = new DecelerateInterpolator(3f);
+    private static final TimeInterpolator ALPHA_EXPAND_INTERPOLATOR = new DecelerateInterpolator();
     private int mAddButtonPlusColor;
     private int mAddButtonColorNormal;
     private int mAddButtonColorPressed;
@@ -74,7 +79,7 @@ public class FloatingActionsMenu extends ViewGroup {
         this(context, null);
     }
 
-    public FloatingActionsMenu(final Context context, AttributeSet attrs) {
+    public FloatingActionsMenu(final Context context, final AttributeSet attrs) {
         super(context, attrs);
         init(context, attrs);
     }
@@ -93,9 +98,12 @@ public class FloatingActionsMenu extends ViewGroup {
         setTouchDelegate(mTouchDelegateGroup);
 
         final TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.FloatingActionsMenu, 0, 0);
-        mAddButtonPlusColor = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonPlusIconColor, getColor(android.R.color.white));
-        mAddButtonColorNormal = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorNormal, getColor(android.R.color.holo_blue_dark));
-        mAddButtonColorPressed = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorPressed, getColor(android.R.color.holo_blue_light));
+        mAddButtonPlusColor = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonPlusIconColor,
+                FloatingActionButton.getColorFromTheme(context, android.R.attr.colorBackground, android.R.color.white));
+        mAddButtonColorNormal = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorNormal,
+                FloatingActionButton.getColorFromTheme(context, android.R.attr.colorAccent, android.R.color.holo_blue_bright));
+        mAddButtonColorPressed = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorPressed,
+                FloatingActionButton.darkenOrLightenColor(mAddButtonColorNormal)); //TODO(msf): use getColorForState on the accent color from theme instead to get darker states
         mAddButtonSize = attr.getInt(R.styleable.FloatingActionsMenu_fab_addButtonSize, FloatingActionButton.SIZE_NORMAL);
         mAddButtonStrokeVisible = attr.getBoolean(R.styleable.FloatingActionsMenu_fab_addButtonStrokeVisible, true);
         mExpandDirection = attr.getInt(R.styleable.FloatingActionsMenu_fab_expandDirection, EXPAND_UP);
@@ -134,7 +142,7 @@ public class FloatingActionsMenu extends ViewGroup {
                 final RotatingDrawable rotatingDrawable = new RotatingDrawable(super.getIconDrawable());
                 mRotatingDrawable = rotatingDrawable;
 
-                final OvershootInterpolator interpolator = new OvershootInterpolator();
+                final TimeInterpolator interpolator = new OvershootInterpolator();
 
                 final ObjectAnimator collapseAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", EXPANDED_PLUS_ROTATION, COLLAPSED_PLUS_ROTATION);
                 final ObjectAnimator expandAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", COLLAPSED_PLUS_ROTATION, EXPANDED_PLUS_ROTATION);
@@ -151,12 +159,7 @@ public class FloatingActionsMenu extends ViewGroup {
 
         mAddButton.setId(R.id.fab_expand_menu_button);
         mAddButton.setSize(mAddButtonSize);
-        mAddButton.setOnClickListener(new OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                toggle();
-            }
-        });
+        mAddButton.setOnClickListener(v -> toggle());
 
         addView(mAddButton, super.generateDefaultLayoutParams());
         mButtonsCount++;
@@ -178,10 +181,6 @@ public class FloatingActionsMenu extends ViewGroup {
         mButtonsCount--;
     }
 
-    private int getColor(@ColorRes final int id) {
-        return getResources().getColor(id);
-    }
-
     @Override
     protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
         measureChildren(widthMeasureSpec, heightMeasureSpec);
@@ -194,7 +193,7 @@ public class FloatingActionsMenu extends ViewGroup {
         int maxLabelWidth = 0;
 
         for (int i = 0; i < mButtonsCount; i++) {
-            View child = getChildAt(i);
+            final View child = getChildAt(i);
 
             if (child.getVisibility() == GONE) {
                 continue;
@@ -214,17 +213,17 @@ public class FloatingActionsMenu extends ViewGroup {
             }
 
             if (!expandsHorizontally()) {
-                TextView label = (TextView) child.getTag(R.id.fab_label);
+                final TextView label = (TextView) child.getTag(R.id.fab_label);
                 if (label != null) {
                     maxLabelWidth = Math.max(maxLabelWidth, label.getMeasuredWidth());
                 }
             }
         }
 
-        if (!expandsHorizontally()) {
-            width = mMaxButtonWidth + (maxLabelWidth > 0 ? maxLabelWidth + mLabelsMargin : 0);
-        } else {
+        if (expandsHorizontally()) {
             height = mMaxButtonHeight;
+        } else {
+            width = mMaxButtonWidth + (maxLabelWidth > 0 ? maxLabelWidth + mLabelsMargin : 0);
         }
 
         switch (mExpandDirection) {
@@ -243,7 +242,7 @@ public class FloatingActionsMenu extends ViewGroup {
         setMeasuredDimension(width, height);
     }
 
-    private int adjustForOvershoot(final int dimension) {
+    private static int adjustForOvershoot(final int dimension) {
         return dimension * 12 / 10;
     }
 
@@ -290,7 +289,7 @@ public class FloatingActionsMenu extends ViewGroup {
                     child.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
                     child.setAlpha(mExpanded ? 1f : 0f);
 
-                    LayoutParams params = (LayoutParams) child.getLayoutParams();
+                    final LayoutParams params = (LayoutParams) child.getLayoutParams();
                     params.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
                     params.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
                     params.setAnimationsTarget(child);
@@ -322,7 +321,7 @@ public class FloatingActionsMenu extends ViewGroup {
                         label.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
                         label.setAlpha(mExpanded ? 1f : 0f);
 
-                        LayoutParams labelParams = (LayoutParams) label.getLayoutParams();
+                        final LayoutParams labelParams = (LayoutParams) label.getLayoutParams();
                         labelParams.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
                         labelParams.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
                         labelParams.setAnimationsTarget(label);
@@ -418,8 +417,8 @@ public class FloatingActionsMenu extends ViewGroup {
             if (button == mAddButton || title == null ||
                     button.getTag(R.id.fab_label) != null) continue;
 
-            final TextView label = new TextView(context);
-            label.setTextAppearance(context, mLabelsStyle);
+            final AppCompatTextView label = new AppCompatTextView(context);
+            label.setTextAppearance(getContext(), mLabelsStyle);
             label.setText(button.getTitle());
             addView(label);
 
@@ -525,6 +524,7 @@ public class FloatingActionsMenu extends ViewGroup {
             return mRotation;
         }
 
+        @Keep
         @SuppressWarnings("UnusedDeclaration")
         public void setRotation(final float rotation) {
             mRotation = rotation;
@@ -544,12 +544,12 @@ public class FloatingActionsMenu extends ViewGroup {
         public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
 
             @Override
-            public SavedState createFromParcel(Parcel in) {
+            public SavedState createFromParcel(final Parcel in) {
                 return new SavedState(in);
             }
 
             @Override
-            public SavedState[] newArray(int size) {
+            public SavedState[] newArray(final int size) {
                 return new SavedState[size];
             }
         };
@@ -582,10 +582,10 @@ public class FloatingActionsMenu extends ViewGroup {
         LayoutParams(final ViewGroup.LayoutParams source) {
             super(source);
 
-            mExpandDir.setInterpolator(sExpandInterpolator);
-            mExpandAlpha.setInterpolator(sAlphaExpandInterpolator);
-            mCollapseDir.setInterpolator(sCollapseInterpolator);
-            mCollapseAlpha.setInterpolator(sCollapseInterpolator);
+            mExpandDir.setInterpolator(EXPAND_INTERPOLATOR);
+            mExpandAlpha.setInterpolator(ALPHA_EXPAND_INTERPOLATOR);
+            mCollapseDir.setInterpolator(COLLAPSE_INTERPOLATOR);
+            mCollapseAlpha.setInterpolator(COLLAPSE_INTERPOLATOR);
 
             mCollapseAlpha.setProperty(View.ALPHA);
             mCollapseAlpha.setFloatValues(1f, 0f);

app/src/main/java/com/wireguard/crypto/KeyEncoding.java

@@ -62,11 +62,10 @@ public final class KeyEncoding {
         final byte[] key = new byte[KEY_LENGTH];
         if (input.length != KEY_LENGTH_BASE64 || input[KEY_LENGTH_BASE64 - 1] != '=')
             throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
-        int i;
+        int i, ret = 0;
         for (i = 0; i < KEY_LENGTH / 3; ++i) {
             final int val = decodeBase64(input, i * 4);
-            if (val < 0)
-                throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
+            ret |= val >>> 31;
             key[i * 3] = (byte) ((val >>> 16) & 0xff);
             key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
             key[i * 3 + 2] = (byte) (val & 0xff);
@@ -78,10 +77,12 @@ public final class KeyEncoding {
                 'A',
         };
         final int val = decodeBase64(endSegment, 0);
-        if (val < 0 || (val & 0xff) != 0)
-            throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
+        ret |= (val >>> 31) | (val & 0xff);
         key[i * 3] = (byte) ((val >>> 16) & 0xff);
         key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
+
+        if (ret != 0)
+            throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
         return key;
     }
 
@@ -90,25 +91,31 @@ public final class KeyEncoding {
         final byte[] key = new byte[KEY_LENGTH];
         if (input.length != KEY_LENGTH_HEX)
             throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
+        int ret = 0;
 
-        int c_acc = 0;
-        int state = 0;
+        for (int i = 0; i < KEY_LENGTH_HEX; i += 2) {
+            int c, c_num, c_num0, c_alpha, c_alpha0, c_val, c_acc;
 
-        for (int i = 0; i < KEY_LENGTH_HEX; ++i) {
-            final int c = input[i];
-            final int c_num = c ^ 48;
-            final int c_num0 = (c_num - 10) >> 8;
-            final int c_alpha = (c & ~32) - 55;
-            final int c_alpha0 = ((c_alpha - 10) ^ (c_alpha - 16)) >> 8;
-            if ((c_num0 | c_alpha0) == 0)
-                throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
-            final int c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
-            if (state == 0)
-                c_acc = c_val * 16;
-            else
-                key[i / 2] = (byte) (c_acc | c_val);
-            state = ~state;
+            c = input[i];
+            c_num = c ^ 48;
+            c_num0 = ((c_num - 10) >>> 8) & 0xff;
+            c_alpha = (c & ~32) - 55;
+            c_alpha0 = (((c_alpha - 10) ^ (c_alpha - 16)) >>> 8) & 0xff;
+            ret |= ((c_num0 | c_alpha0) - 1) >>> 8;
+            c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
+            c_acc = c_val * 16;
+
+            c = input[i + 1];
+            c_num = c ^ 48;
+            c_num0 = ((c_num - 10) >>> 8) & 0xff;
+            c_alpha = (c & ~32) - 55;
+            c_alpha0 = (((c_alpha - 10) ^ (c_alpha - 16)) >>> 8) & 0xff;
+            ret |= ((c_num0 | c_alpha0) - 1) >>> 8;
+            c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
+            key[i / 2] = (byte) (c_acc | c_val);
         }
+        if (ret != 0)
+            throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
         return key;
     }
 

app/src/main/res/drawable/fab_label_background.xml

@@ -6,5 +6,5 @@
         android:left="8dp"
         android:right="8dp"
         android:top="4dp" />
-    <solid android:color="?android:attr/colorPrimary" />
+    <solid android:color="@color/fab_label_background_color" />
 </shape>

app/src/main/res/drawable/ic_action_delete.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
 </vector>

app/src/main/res/drawable/ic_action_delete_black.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportHeight="24"
-    android:viewportWidth="24">
-    <path
-        android:fillColor="#000000"
-        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
-</vector>

app/src/main/res/drawable/ic_action_edit.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" />
 </vector>

app/src/main/res/drawable/ic_action_edit_inverse.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="?android:attr/colorBackground"
+        android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" />
+</vector>

app/src/main/res/drawable/ic_action_open.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6L6,2zM13,9L13,3.5L18.5,9L13,9z" />
 </vector>

app/src/main/res/drawable/ic_action_open_inverse.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="?android:attr/colorBackground"
+        android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6L6,2zM13,9L13,3.5L18.5,9L13,9z" />
+</vector>

app/src/main/res/drawable/ic_action_save.xml

@@ -5,6 +5,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M17,3L5,3c-1.11,0 -2,0.9 -2,2v14c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2L21,7l-4,-4zM12,19c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3zM15,9L5,9L5,5h10v4z" />
 </vector>

app/src/main/res/drawable/ic_settings.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M19.43,12.98c0.04,-0.32 0.07,-0.64 0.07,-0.98s-0.03,-0.66 -0.07,-0.98l2.11,-1.65c0.19,-0.15 0.24,-0.42 0.12,-0.64l-2,-3.46c-0.12,-0.22 -0.39,-0.3 -0.61,-0.22l-2.49,1c-0.52,-0.4 -1.08,-0.73 -1.69,-0.98l-0.38,-2.65C14.46,2.18 14.25,2 14,2h-4c-0.25,0 -0.46,0.18 -0.49,0.42l-0.38,2.65c-0.61,0.25 -1.17,0.59 -1.69,0.98l-2.49,-1c-0.23,-0.09 -0.49,0 -0.61,0.22l-2,3.46c-0.13,0.22 -0.07,0.49 0.12,0.64l2.11,1.65c-0.04,0.32 -0.07,0.65 -0.07,0.98s0.03,0.66 0.07,0.98l-2.11,1.65c-0.19,0.15 -0.24,0.42 -0.12,0.64l2,3.46c0.12,0.22 0.39,0.3 0.61,0.22l2.49,-1c0.52,0.4 1.08,0.73 1.69,0.98l0.38,2.65c0.03,0.24 0.24,0.42 0.49,0.42h4c0.25,0 0.46,-0.18 0.49,-0.42l0.38,-2.65c0.61,-0.25 1.17,-0.59 1.69,-0.98l2.49,1c0.23,0.09 0.49,0 0.61,-0.22l2,-3.46c0.12,-0.22 0.07,-0.49 -0.12,-0.64l-2.11,-1.65zM12,15.5c-1.93,0 -3.5,-1.57 -3.5,-3.5s1.57,-3.5 3.5,-3.5 3.5,1.57 3.5,3.5 -1.57,3.5 -3.5,3.5z" />
 </vector>

app/src/main/res/drawable/list_item_background.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@color/list_item_activated" android:state_activated="true" />
-    <item android:drawable="@android:color/transparent" />
+    <item android:drawable="@color/list_item_activated" android:state_activated="true" /> <!-- TODO(msf): themeify this -->
+    <item android:drawable="@android:color/transparent" /> <!-- TODO(msf): themeify this -->
 </selector>

app/src/main/res/drawable/list_item_background_anim.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ripple xmlns:android="http://schemas.android.com/apk/res/android"
-    android:color="@color/list_item_ripple">
+    android:color="@color/list_item_ripple"> <!-- TODO(msf): themeify this -->
     <item android:drawable="@drawable/list_item_background" />
 </ripple>

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

@@ -51,7 +51,7 @@
                 android:background="@null"
                 android:contentDescription="@string/delete"
                 android:onClick="@{() -> collection.remove(item)}"
-                android:src="@drawable/ic_action_delete_black" />
+                android:src="@drawable/ic_action_delete" />
 
             <TextView
                 android:id="@+id/public_key_label"

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

@@ -44,7 +44,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:onClick="@{fragment::onRequestCreateConfig}"
-                app:fab_icon="@drawable/ic_action_edit"
+                app:fab_icon="@drawable/ic_action_edit_inverse"
                 app:fab_size="mini"
                 app:fab_title="@string/create_empty" />
 
@@ -53,7 +53,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:onClick="@{fragment::onRequestImportConfig}"
-                app:fab_icon="@drawable/ic_action_open"
+                app:fab_icon="@drawable/ic_action_open_inverse"
                 app:fab_size="mini"
                 app:fab_title="@string/create_from_file" />
         </com.wireguard.android.widget.fab.FloatingActionsMenu>

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- TODO(msf): remove these 4 hard-coded colors and replace with theme colors -->
+    <color name="list_item_activated">#64cfd8dc</color>
+    <color name="list_item_ripple">#a0808e95</color>
+    <color name="fab_label_text_color">#000000</color>
+    <color name="fab_label_background_color">#bbbbbb</color>
+
+    <color name="accent">#BBDEFB</color>
+</resources>

app/src/main/res/values/colors.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- TODO(msf): remove these 4 hard-coded colors and replace with theme colors -->
     <color name="list_item_activated">#cfd8dc</color> <!-- Blue Grey 200 -->
     <color name="list_item_ripple">#808e95</color> <!-- Blue Grey 200 dark -->
+    <color name="fab_label_text_color">#ffffff</color>
+    <color name="fab_label_background_color">#444444</color>
+
+    <color name="accent">#2196F3</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -29,6 +29,9 @@
     <string name="create_activity_title">Create WireGuard Tunnel</string>
     <string name="create_empty">Create from scratch</string>
     <string name="create_from_file">Create from file or archive</string>
+    <string name="dark_theme_title">Use dark theme</string>
+    <string name="dark_theme_summary_on">Currently using dark night theme</string>
+    <string name="dark_theme_summary_off">Currently using light day theme</string>
     <string name="delete">Delete</string>
     <string name="dns_servers">DNS servers</string>
     <string name="edit">Edit</string>
@@ -71,5 +74,9 @@
     <string name="tunnel_create_success">Successfully created tunnel “%s”</string>
     <string name="tunnel_rename_error">Unable to rename tunnel: %s</string>
     <string name="tunnel_rename_success">Successfully renamed tunnel to “%s”</string>
+    <string name="version_title">WireGuard for Android v%s"</string>
+    <string name="version_kernel_summary">Using kernel module implementation v%s</string>
+    <string name="version_kernel_unknown_summary">Using unknown kernel module implementation</string>
+    <string name="version_userspace_summary">Using Go userspace implementation v%s</string>
     <string name="zip_exporter_title">Export tunnels to zip file</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar" />
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
+        <item name="colorAccent">@color/accent</item>
+    </style>
 
     <style name="SettingsTheme" parent="AppTheme">
         <item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material</item>
@@ -9,6 +11,7 @@
 
     <style name="fab_label" parent="android:TextAppearance.DeviceDefault.Inverse">
         <item name="android:background">@drawable/fab_label_background</item>
+        <item name="android:textColor">@color/fab_label_text_color</item>
     </style>
 
 </resources>

app/src/main/res/xml/preferences.xml

@@ -7,4 +7,11 @@
         android:title="@string/restore_on_boot_title" />
     <com.wireguard.android.preference.ToolsInstallerPreference android:key="tools_installer" />
     <com.wireguard.android.preference.ZipExporterPreference android:key="zip_exporter" />
+    <CheckBoxPreference
+        android:defaultValue="false"
+        android:key="dark_theme"
+        android:summaryOn="@string/dark_theme_summary_on"
+        android:summaryOff="@string/dark_theme_summary_off"
+        android:title="@string/dark_theme_title" />
+    <com.wireguard.android.preference.VersionPreference />
 </PreferenceScreen>

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/api-android.go

@@ -160,4 +160,9 @@ func wgGetSocketV6(tunnelHandle int32) int32 {
 	return fd
 }
 
+//export wgVersion
+func wgVersion() string {
+	return WireGuardGoVersion
+}
+
 func main() {}

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/jni.c

@@ -4,12 +4,15 @@
  */
 
 #include <jni.h>
+#include <stdlib.h>
+#include <string.h>
 
 struct go_string { const char *str; long n; };
 extern int wgTurnOn(struct go_string ifname, int tun_fd, struct go_string settings);
 extern void wgTurnOff(int handle);
 extern int wgGetSocketV4(int handle);
 extern int wgGetSocketV6(int handle);
+extern struct go_string wgVersion();
 
 JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgTurnOn(JNIEnv *env, jclass c, jstring ifname, jint tun_fd, jstring settings)
 {
@@ -43,3 +46,17 @@ JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgGetSocketV
 {
 	return wgGetSocketV6(handle);
 }
+
+JNIEXPORT jstring JNICALL Java_com_wireguard_android_backend_GoBackend_wgVersion(JNIEnv *env, jclass c)
+{
+	struct go_string s = wgVersion();
+	char *cstr = malloc(s.n + 1);
+	if (!cstr)
+		return NULL;
+	jstring ret;
+	memcpy(cstr, s.str, s.n);
+	cstr[s.n] = '\0';
+	ret = (*env)->NewStringUTF(env, cstr);
+	free(cstr);
+	return ret;
+}