尝试在 android 上运行 ionic 项目时连接到 mysql 数据库失败

Question

I am trying to run an ionic application using nodejs as server to connect to mysql database on android , the application runs perfectly on lab but when it comes to android it failed to connect to localhost , apparently the emulator couldn't recognize the address am using .This is the code am using in my ionic service :

export class CandidatService {
  base_path = 'http://10.0.2.2:1617';

  constructor(private http: HttpClient) { }

  // Http Options
  httpOptions = {
    headers: new HttpHeaders({
      'Content-Type': 'application/json'
    })
  }

  getAllCandidats(): Observable<Candidat[]>
  {
    return this.http
      .get<Candidat[]>(this.base_path+"/selectAllCandidats", this.httpOptions)
      .pipe()
  }
}```

Answer 1

is this ip and port is the valid nodejs server app?

http://10.0.2.2:1617

do you have console.log on what happen on the nodejs ? is your nodejs server and your android is running on same wifi ?

if no, then you might need to use public ip or the simple one is using ngrok

reference : https://ngrok.com/