rename android_errorMessage to errorMessageAndroid

Following same implementation used with underlineColorAndroid
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/TextInput.js#L470
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/AndroidTextInputNativeComponent.js#L203

While with other components (for example prop android_ripple), we use
the android_ prefix to denote platform specific props.
facebook#29157 (comment)
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/Pressable/Pressable.js#L177

In the case of TextInput we already have Platform Logic that detects
Android/iOS platform.
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/TextInput.js#L1268

For this reason TextInput component does not use android_ props and
instead uses this naming convention underlineColorAndroid.

To be noted that the prop underlineColorAndroid is passed to both iOS
and Android version, while other props have platform specific logic for
android and iOS.
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/TextInput.js#L1334
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/TextInput.js#L1293

Example of a prop that have a specific value on Android and is different
from iOS
https://github.com/fabriziobertoglio1987/react-native/blob/15810e96d90e18dbd424666338fdec0127d403ed/Libraries/Components/TextInput/TextInput.js#L1271

I decided to follow the same solution used in underlineColorAndroid.

Author: fabOnReact

Libraries/Components/TextInput/AndroidTextInputNativeComponent.js

@@ -163,6 +163,14 @@ export type NativeProps = $ReadOnly<{|
     'off',
   >,
 
+  /**
+   * String to be read by screenreaders to indicate an error state. If this value is
+   * not null, an error will be announced. You can use onChangeText or onBlur to
+   * detect an error and set this prop. Once the error is gone, set this to null
+   * to clear the error
+   */
+  errorMessageAndroid?: ?Stringish,
+
   /**
    * Sets the return key to the label. Use it instead of `returnKeyType`.
    * @platform android
@@ -698,7 +706,7 @@ export const __INTERNAL_VIEW_CONFIG: PartialViewConfig = {
     inlineImageLeft: true,
     editable: true,
     fontVariant: true,
-    android_errorMessage: true,
+    errorMessageAndroid: true,
     borderBottomRightRadius: true,
     borderBottomColor: {process: require('../../StyleSheet/processColor')},
     borderRadius: true,

Libraries/Components/TextInput/TextInput.js

@@ -408,7 +408,7 @@ type AndroidProps = $ReadOnly<{|
    * detect an error and set this prop. Once the error is gone, set this to null
    * to clear the error
    */
-  android_errorMessage?: ?Stringish,
+  errorMessageAndroid?: ?Stringish,
 
   importantForAutofill?: ?(
     | 'auto'

ReactAndroid/src/main/java/com/facebook/react/uimanager/ViewProps.java

@@ -84,7 +84,6 @@ public class ViewProps {
   public static final String BACKGROUND_COLOR = "backgroundColor";
   public static final String FOREGROUND_COLOR = "foregroundColor";
   public static final String COLOR = "color";
-  public static final String ANDROID_ERROR_MESSAGE = "android_errorMessage";
   public static final String FONT_SIZE = "fontSize";
   public static final String FONT_WEIGHT = "fontWeight";
   public static final String FONT_STYLE = "fontStyle";

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

@@ -373,8 +373,8 @@ public void updateExtraData(ReactEditText view, Object extraData) {
     }
   }
 
-  @ReactProp(name = ViewProps.ANDROID_ERROR_MESSAGE)
-  public void setErrorMessage(ReactEditText view, String error) {
+  @ReactProp(name = "errorMessageAndroid")
+  public void setErrorMessage(ReactEditText view, @Nullable String error) {
     view.setError(error);
   }
 
@@ -1328,9 +1328,7 @@ public Object updateState(
 
     @Nullable
     String errorMessage =
-        props.hasKey(ViewProps.ANDROID_ERROR_MESSAGE)
-            ? props.getString(ViewProps.ANDROID_ERROR_MESSAGE)
-            : null;
+        props.hasKey("errorMessageAndroid") ? props.getString("errorMessageAndroid") : null;
 
     return ReactTextUpdate.buildReactTextUpdateFromState(
         spanned,

packages/rn-tester/js/examples/TextInput/TextInputSharedExamples.js

@@ -483,7 +483,7 @@ function ErrorExample(): React.Node {
         Type error in the below TextInput to display an error message.
       </Text>
       <TextInput
-        android_errorMessage={error}
+        errorMessageAndroid={error}
         onBlur={() => setError('onBlur')}
         onEndEditing={() => setError('onEndEditing')}
         onChangeText={newText => {