如何读取在启动时在IONIC中添加到应用程序的自定义文件

ionic cordova plugin add cordova-plugin-file
npm install @ionic-native/file

import { File } from '@ionic-native/file/ngx';
import { Platform } from '@ionic/angular';

constructor(private file: File, private platform: Platform) { }

readCustomFile() {
  this.platform.ready().then(() => {
    // 获取应用程序的文件目录
    const appDirectory = this.file.applicationDirectory;
    
    // 自定义文件的路径
    const customFilePath = appDirectory + 'path/to/custom/file.txt';
    
    // 读取文件
    this.file.readAsText(customFilePath, '')
      .then((content) => {
        console.log('文件内容：', content);
      })
      .catch((error) => {
        console.error('读取文件错误：', error);
      });
  });
}