无法从Android应用连接到localhost API [英] Cannot connect to localhost API from Android app

问题描述

我是Django的新手.我创建了一个名为http://127.0.0.1:8000/api/update/1/的API，它在浏览器和Postman应用程序中均能完美运行.

I am new to Django. I have created an API named http://127.0.0.1:8000/api/update/1/ and it works perfectly in the browser and on the Postman app.

但是，当我尝试从Android应用访问API时，它返回NULL.

However, when I am trying to access the API from the Android app it is returning NULL.

以下API时android代码有效.

The android code works when the API is the following.

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

但是，即使下面的API在运行于同一台PC上的我的浏览器和Postman应用程序中正常运行时，也无法正常工作.

However, it does not work when the API is the following, even if the following API works just fine from my browser running in the same PC and from the Postman application.

http://127.0.0.1:8000/api/update/1/

我正在附上进行API调用的代码.

I am attaching the code where API call is made.

protected String doInBackground(String... args) {
    String xml = "";
    String api = "http://127.0.0.1:8000/api/update/1/"; // returns NULL works in Postman app and in the browser
    // String api = "http://newsapi.org/v1/articles?source=bbc-news&sortBy=top&apiKey=8190df9eb51445228e397e4185311a66"; // works in all places
    String urlParameters = "";
    xml = Function.excuteGet(api, urlParameters);
    return  xml;
}

有人可以帮我吗?提前致谢.

Can anyone help me with this? Thanks in advance.

推荐答案

如果要从真实的android设备测试应用程序，则在尝试通过以下方式连接到Django服务器时，需要输入PC的IP地址蜜蜂.是的，您也需要处于同一网络中.因此，您需要检查以下内容.

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. 确保PC(正在运行服务器的地方)和Android设备(正在测试应用程序的地方)位于同一网络中(可能与同一Wifi网络连接).

2. 确保您已连接到运行服务器的PC的IP地址.例如，现在，您的PC的IP地址为192.168.0.100.然后，您需要连接到该IP地址并像下面一样调用您的API.

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/

确保您正在接受对PC中端口8000的请求.检查您的防火墙配置是否阻止了任何向8000端口的传入请求.如果发现阻塞，请使用以下命令允许对8000端口的传入请求.

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

如果没有任何帮助的方法，请检查您的Android代码以检查API调用是否正常.我强烈建议使用Volley进行API调用，开发人员建议文档.

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.

最后但并非最不重要的一点，请检查您的AndroidManifest.xml文件是否具有必要的权限.您需要添加以下权限，才能授予您的应用程序使用Internet的权限.

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" />

这篇关于无法从Android应用连接到localhost API的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！