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diff --git a/examples/ex7_default_and_optional_rpc/src/main/java/com/google/android/mobly/snippet/example7/ExampleDefaultAndOptionalRpcSnippet.java b/examples/ex7_default_and_optional_rpc/src/main/java/com/google/android/mobly/snippet/example7/ExampleDefaultAndOptionalRpcSnippet.java
new file mode 100644
index 0000000..cef9343
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+++ b/examples/ex7_default_and_optional_rpc/src/main/java/com/google/android/mobly/snippet/example7/ExampleDefaultAndOptionalRpcSnippet.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2017 Google Inc.
+ *
+ * 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.
+ */
+
+package com.google.android.mobly.snippet.example7;
+
+import android.content.Context;
+import android.os.Handler;
+import android.widget.Toast;
+import androidx.test.InstrumentationRegistry;
+import com.google.android.mobly.snippet.Snippet;
+import com.google.android.mobly.snippet.event.EventCache;
+import com.google.android.mobly.snippet.rpc.Rpc;
+import com.google.android.mobly.snippet.rpc.RpcDefault;
+import com.google.android.mobly.snippet.rpc.RpcOptional;
+
+/** Demonstrates how to mark an RPC has default value or optional. */
+public class ExampleDefaultAndOptionalRpcSnippet implements Snippet {
+
+    private final Context mContext;
+    private final EventCache mEventCache = EventCache.getInstance();
+
+    /**
+     * Since the APIs here deal with UI, most of them have to be called in a thread that has called
+     * looper.
+     */
+    private final Handler mHandler;
+
+    public ExampleDefaultAndOptionalRpcSnippet() {
+        mContext = InstrumentationRegistry.getContext();
+        mHandler = new Handler(mContext.getMainLooper());
+    }
+
+    @Rpc(description = "Make a toast on screen.")
+    public String makeToast(
+            String message, @RpcDefault("true") Boolean bool, @RpcOptional Integer number)
+            throws InterruptedException {
+        if (number == null) {
+            showToast(String.format("%s, bool:%b", message, bool));
+        } else {
+            showToast(String.format("%s, bool:%b, number:%d", message, bool, number));
+        }
+        return "OK";
+    }
+
+    @Override
+    public void shutdown() {}
+
+    private void showToast(final String message) {
+        mHandler.post(
+            new Runnable() {
+                @Override
+                public void run() {
+                    Toast.makeText(mContext, message, Toast.LENGTH_LONG).show();
+                }
+            });
+    }
+}