无法从 Android 应用程序连接到 localhost API

Question

我是 Django 的新手。我创建了一个名为http:\/\/127.0.0.1:8000\/api\/update\/1\/<\/code>的 API，它可以在浏览器和 Postman 应用程序中完美运行。

但是，当我尝试从 Android 应用程序访问 API 时，它返回 NULL。

当 API 如下时，android 代码可以工作。

http://newsapi.org/v1/articles?source=bbc-news&sortBy=top&apiKey=8190df9eb51445228e397e4185311a66

Answer 1

If you are testing your application from a real android device then you need to put the IP address of your PC while you are trying to connect to your Django server through APIs. And yes, you need to be in the same network as well. So you need to check the following things.

1. Make sure that the PC (where you are running the server) and the Android device (where you are testing your application) are in the same network (connected with same Wifi network maybe).

2. Make sure you are connecting to the IP address of your PC where the server is running. For example, right now, the IP address of your PC is 192.168.0.100 . Then, you need to connect to this IP address and call your API like the following.

    http://192.168.0.100:8000/api/update/1/

3. Make sure you are accepting requests to the port 8000 in your PC. Check your Firewall configuration if it is blocking any incoming requests to the 8000 port. If it is found blocking, then please allow an incoming request to the 8000 port using the following.

    sudo ufw allow 8000/tcp

If there is nothing which is helping you, then please check your Android code to check if the API calling is okay. I would strongly recommend using Volley for API calls suggested in developers documentation.

Last, but not the least, please check if you have necessary permission in your AndroidManifest.xml file. You need to add the following permission to grant your application to use the internet.

<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 2

To be able to connect your localhost (I assume you are using emulator, I can edit the answer if not)

You need to use the following url:

http://10.0.2.2:8000/

Answer 3

Please run your django development server using the following command.

python manage.py runserver 0.0.0.0:8000

Once you get it running, in a new terminal window find out the ip address of your computer in your wifi/network subnet using the following command

Ipconfig or ifconfig (depends on your OS)

Then change the base url of your api from 127.0.0.1 to the ip you found in the above step. Now connect the android phone in which your app is being tested to your same wifi or network to which the computer running django is connected. Now you can request and receive response.

127.0.0.1 is the home of your system, your android app will not be able to access that. You need to do it like this.

Answer 4

1)Andoird manifest to put internet permission and network acceess 2) if using Android simulator on local machine. Use 10.0.2.2. alias created by default for 127.0.0.1 ie losthoast.

Its works for me

Answer 5

The API isn't working in POSTMAN I tried http://127.0.0.1:8000/api/update/1/ shows an error because it requires some params to be inputted.

in this case, http://newsapi.org/v1/articles?source=bbc-news&sortBy=top&apiKey=8190df9eb51445228e397e4185311a66 the required params have been provided to the API, ie source, sortBy & apiKey

Answer 6

It is possible to call local api with some minor changes.These were the steps I did to hit the local django api from my android app.

• You need to be connected to same network. Better create a hotspot from your pc or laptop and connect android with it
• Create static IP from your system. If you are on VM you may require additional network adapter. Please google it as there are plenty of videos and blogs on the same.
• Host django on the created local IP.

You are then good to go with your android app.

Answer 7

You can not access a local api outside from that local device. 127.0.0.1 is the local address of its own. If you want to access the api outside from local device, replace the ip with the ip that is open to outside. For example, 192.168.43.2 is a ip that is accessible from outside. Update your api with the accessible ip(use ifconfig or ipconfig in terminal to obtain the ip and use that ip to access from outsid?). Also, please make sure if you have proper permission in AndroidManifest.xml file.

Answer 8

For me, the problem was that my server was running on HTTP, not HTTPS. Once I set up my SSL certificate, everything worked fine. I'm using Expo and strangely the API works when in development mode through the Expo app, but after I build an APK it fails to connect to any non-HTTPS server.

Answer 9

在本地主机中，您必须启动服务器并在同一系统中进行应用程序开发，然后才适合您..

Answer 10

There is no way of calling local APIs from android. Leave it.