android support! thanks to TachiWeb devs.

AndroidCompat/src/main/java/com/f2prateek/rx/preferences/IntegerAdapter.java

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+/*
+Copyright 2014 Prateek Srivastava
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+This file may have been modified after being copied from it's original source.
+ */
+package com.f2prateek.rx.preferences;
+
+import android.content.SharedPreferences;
+import android.support.annotation.NonNull;
+
+final class IntegerAdapter implements Preference.Adapter<Integer> {
+  static final IntegerAdapter INSTANCE = new IntegerAdapter();
+
+  @Override public Integer get(@NonNull String key, @NonNull SharedPreferences preferences) {
+    return preferences.getInt(key, 0);
+  }
+
+  @Override public void set(@NonNull String key, @NonNull Integer value,
+      @NonNull SharedPreferences.Editor editor) {
+    editor.putInt(key, value);
+  }
+}