A bit of code cleanup, mostly getting rid of warnings.

app/src/main/java/com/keylesspalace/tusky/Assert.java

@@ -0,0 +1,27 @@
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is part of Tusky.
+ *
+ * Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License as published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky. If not, see
+ * <http://www.gnu.org/licenses/>. */
+
+package com.keylesspalace.tusky;
+
+/** Android Studio complains about built-in assertions so here's this is an alternative. */
+class Assert {
+    private static boolean ENABLED = BuildConfig.DEBUG;
+
+    static void expect(boolean expression) {
+        if (ENABLED && !expression) {
+            throw new AssertionError();
+        }
+    }
+}