Fallback for textAlign: justify

Summary:Fixes #5408 as per ide and vjeux suggestions here https://github.com/facebook/react-native/issues/529#issuecomment-107328799

Could've been probably done in a single `if` clause, but this is more explicit and leaves potential place for future implementation (if we ever decide to do so)
Closes https://github.com/facebook/react-native/pull/7197

Differential Revision: D3217740

Pulled By: vjeux

fb-gh-sync-id: aa08a5c42e43c1abe17b72a424ee96146f2667f6
fbshipit-source-id: aa08a5c42e43c1abe17b72a424ee96146f2667f6

Libraries/Text/TextStylePropTypes.js

@@ -41,7 +41,8 @@ var TextStylePropTypes = Object.assign(Object.create(ViewStylePropTypes), {
   letterSpacing: ReactPropTypes.number,
   lineHeight: ReactPropTypes.number,
   /**
-   * Specifies text alignment. The value 'justify' is only supported on iOS.
+   * Specifies text alignment. The value 'justify' is only supported on iOS and
+   * fallbacks to `left` on Android.
    */
   textAlign: ReactPropTypes.oneOf(
     ['auto' /*default*/, 'left', 'right', 'center', 'justify']

ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextViewManager.java

@@ -65,6 +65,9 @@ public class ReactTextViewManager extends BaseViewManager<ReactTextView, ReactTe
       view.setGravityHorizontal(Gravity.RIGHT);
     } else if ("center".equals(textAlign)) {
       view.setGravityHorizontal(Gravity.CENTER_HORIZONTAL);
+    } else if ("justify".equals(textAlign)) {
+      // Fallback gracefully for cross-platform compat instead of error
+      view.setGravityHorizontal(Gravity.LEFT);
     } else {
       throw new JSApplicationIllegalArgumentException("Invalid textAlign: " + textAlign);
     }

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -242,6 +242,9 @@ public class ReactTextInputManager extends BaseViewManager<ReactEditText, Layout
       view.setGravityHorizontal(Gravity.RIGHT);
     } else if ("center".equals(textAlign)) {
       view.setGravityHorizontal(Gravity.CENTER_HORIZONTAL);
+    } else if ("justify".equals(textAlign)) {
+      // Fallback gracefully for cross-platform compat instead of error
+      view.setGravityHorizontal(Gravity.LEFT);
     } else {
       throw new JSApplicationIllegalArgumentException("Invalid textAlign: " + textAlign);
     }