crazycharge-app/util/index.ts

import { Linking, Alert } from 'react-native';

export const handleGoWhatsApp = async () => {
  const phoneWithCountryCode = '8528691382139'; // 不带 "+"，如 +60 改成 60（马来西亚）
  const message = 'Hello!';

  const url = `whatsapp://send?phone=${phoneWithCountryCode}&text=${encodeURIComponent(message)}`;

  const supported = await Linking.canOpenURL(url);
  if (supported) {
    await Linking.openURL(url);
  } else {
    Alert.alert('WhatsApp 未安裝', '請先安裝 WhatsApp 應用');
  }
};