Update

app/src/main/java/com/hippo/util/IntIdGenerator.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * 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
+ * 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.
+ */
+package com.hippo.util;
+
+public final class IntIdGenerator {
+
+    private int mId = 0;
+
+    private IntIdGenerator() {
+        // Empty
+    }
+
+    public int nextId() {
+        return mId++;
+    }
+
+    public static IntIdGenerator create() {
+        return new IntIdGenerator();
+    }
+}