Android: Added support to arrays in toBundle

Summary:
The support for `ReadableArray` in `toBundle` was never implemented, throwing an `UnsupportedOperationException` when trying to convert an array.

* Created `toList` -- A method that converts a `ReadableArray` to an `ArrayList`
* Modified `toBundle` to support arrays using `toList`
* Created `fromList` -- A method that converts a `List` to a `WritableArray`
* Modified `fromBundle` to also support lists using `fromList`

This PR allows `toBundle` and `fromBundle` (as well as `toList` and `fromList`) to work consistently without loosing information.

**Test Plan**

I've created three different arrays: one full of integers, one full of strings, and one mixed (with a integer, a boolean, a string, null, a map with a string and a boolean array), putting all of them inside a map.

After converting the map to a `Bundle` using `toBundle`, the integer array was retrieved through `Bundle.getIntegerArrayList`, the string array through `Bundle.getStringArrayList` and the mixed array through `Bundle.get` (casting it to an `ArrayList`)

After checking whether each value from the bundle was correct, I converted the bundle back to a map using `fromBundle`, and checked again every value.

The code and results from the test can be found in [this gist](https://gist.github.com/Guichaguri/5c7574b31f9584b6a9a0c182fd940a86).
Closes #15056

Differential Revision: D5460966

Pulled By: javache

fbshipit-source-id: a11b450eae4186e68bed7b8ce7dea8e5982e689a

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

@@ -11,6 +11,7 @@
 import java.lang.reflect.Array;
 
 import java.util.AbstractList;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
@@ -235,13 +236,48 @@ public static WritableArray fromArray(Object array) {
     return catalystArray;
   }
 
+  /**
+   * Convert a {@link List} to a {@link WritableArray}.
+   *
+   * @param list the list to convert. Supported value types are: {@code null}, {@code String}, {@code Bundle},
+   *              {@code List}, {@code Number}, {@code Boolean}, and all array types supported in {@link #fromArray(Object)}.
+   * @return the converted {@link WritableArray}
+   * @throws IllegalArgumentException if one of the values from the passed list is none of the above types
+   */
+  public static WritableArray fromList(List list) {
+    WritableArray catalystArray = createArray();
+    for (Object obj : list) {
+      if (obj == null) {
+        catalystArray.pushNull();
+      } else if (obj.getClass().isArray()) {
+        catalystArray.pushArray(fromArray(obj));
+      } else if (obj instanceof Bundle) {
+        catalystArray.pushMap(fromBundle((Bundle) obj));
+      } else if (obj instanceof List) {
+        catalystArray.pushArray(fromList((List) obj));
+      } else if (obj instanceof String) {
+        catalystArray.pushString((String) obj);
+      } else if (obj instanceof Integer) {
+        catalystArray.pushInt((Integer) obj);
+      } else if (obj instanceof Number) {
+        catalystArray.pushDouble(((Number) obj).doubleValue());
+      } else if (obj instanceof Boolean) {
+        catalystArray.pushBoolean((Boolean) obj);
+      } else {
+        throw new IllegalArgumentException("Unknown value type " + obj.getClass());
+      }
+    }
+    return catalystArray;
+  }
+
   /**
    * Convert a {@link Bundle} to a {@link WritableMap}. Supported key types in the bundle
    * are:
    * <p>
    * <ul>
    * <li>primitive types: int, float, double, boolean</li>
    * <li>arrays supported by {@link #fromArray(Object)}</li>
+   * <li>lists supported by {@link #fromList(List)}</li>
    * <li>{@link Bundle} objects that are recursively converted to maps</li>
    * </ul>
    *
@@ -269,15 +305,67 @@ public static WritableMap fromBundle(Bundle bundle) {
         map.putBoolean(key, (Boolean) value);
       } else if (value instanceof Bundle) {
         map.putMap(key, fromBundle((Bundle) value));
+      } else if (value instanceof List) {
+        map.putArray(key, fromList((List) value));
       } else {
         throw new IllegalArgumentException("Could not convert " + value.getClass());
       }
     }
     return map;
   }
 
+  /**
+   * Convert a {@link WritableArray} to a {@link ArrayList}.
+   *
+   * @param readableArray the {@link WritableArray} to convert.
+   * @return the converted {@link ArrayList}.
+   */
+  @Nullable
+  public static ArrayList toList(@Nullable ReadableArray readableArray) {
+    if (readableArray == null) {
+      return null;
+    }
+
+    ArrayList list = new ArrayList();
+
+    for (int i = 0; i < readableArray.size(); i++) {
+      switch (readableArray.getType(i)) {
+        case Null:
+          list.add(null);
+          break;
+        case Boolean:
+          list.add(readableArray.getBoolean(i));
+          break;
+        case Number:
+          double number = readableArray.getDouble(i);
+          if (number == Math.rint(number)) {
+            // Add as an integer
+            list.add((int) number);
+          } else {
+            // Add as a double
+            list.add(number);
+          }
+          break;
+        case String:
+          list.add(readableArray.getString(i));
+          break;
+        case Map:
+          list.add(toBundle(readableArray.getMap(i)));
+          break;
+        case Array:
+          list.add(toList(readableArray.getArray(i)));
+          break;
+        default:
+          throw new IllegalArgumentException("Could not convert object in array.");
+      }
+    }
+
+    return list;
+  }
+
   /**
    * Convert a {@link WritableMap} to a {@link Bundle}.
+   * Note: Each array is converted to an {@link ArrayList}.
    *
    * @param readableMap the {@link WritableMap} to convert.
    * @return the converted {@link Bundle}.
@@ -312,8 +400,8 @@ public static Bundle toBundle(@Nullable ReadableMap readableMap) {
           bundle.putBundle(key, toBundle(readableMap.getMap(key)));
           break;
         case Array:
-          // TODO t8873322
-          throw new UnsupportedOperationException("Arrays aren't supported yet.");
+          bundle.putSerializable(key, toList(readableMap.getArray(key)));
+          break;
         default:
           throw new IllegalArgumentException("Could not convert object with key: " + key + ".");
       }