Add dynamic type for javascript arguments passed over bridge with unkown type

Reviewed By: astreet

Differential Revision: D4380882

fbshipit-source-id: f1b9fb9cf727d003dcc2264626e75fc300a47dee

ReactAndroid/src/main/java/com/facebook/react/bridge/DynamicFromArray.java

@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.bridge;
+
+/**
+ * Implementation of Dynamic wrapping a ReadableArray.
+ */
+public class DynamicFromArray implements Dynamic {
+
+  private final ReadableArray mArray;
+  private final int mIndex;
+
+  public DynamicFromArray(ReadableArray array, int index) {
+    mArray = array;
+    mIndex = index;
+  }
+
+  @Override
+  public boolean asBoolean() {
+    return mArray.getBoolean(mIndex);
+  }
+
+  @Override
+  public double asDouble() {
+    return mArray.getDouble(mIndex);
+  }
+
+  @Override
+  public int asInt() {
+    return mArray.getInt(mIndex);
+  }
+
+  @Override
+  public String asString() {
+    return mArray.getString(mIndex);
+  }
+
+  @Override
+  public ReadableArray asArray() {
+    return mArray.getArray(mIndex);
+  }
+
+  @Override
+  public ReadableMap asMap() {
+    return mArray.getMap(mIndex);
+  }
+
+  @Override
+  public ReadableType getType() {
+    return mArray.getType(mIndex);
+  }
+}