[SOLVED] How to connect Android Emulator to localhost application- 1 simple solution?

To connect from the Emulator to the application that we have running on [ Connect Android Emulator" to localhost application ] your current machine, you must give the appropriate IP address, because Android" internally recognizes localhost / 127.0.0.1 as the internal address of the loopback website.

Why We Need It?

When we develop Android" application which will communicate with other application we want to have such possibility without application deployment of these application to target server. Just have everything on localhost machine and integrate it together.

Using this approach we will save a lot of time, due to fact that application during development are constantly changing and the test loop should be as quicker as possible. We will save a lot of time and we will be calmer people. It is terrible and frustrating for the developer to waste time running tests and adding them.

Let’s move to the solution about how to Android Emulator" connect to localhost!

Solution -> Connect Android Emulator to localhost application

Instead of localhost/127.0.0.1 use 10.0.2.2 IP address.

Android Emulator Localhost

    Retrofit.Builder builder = new Retrofit.Builder()
            .baseUrl("https://10.0.2.2:8080/")
            .addConverterFactory(GsonConverterFactory.create());

File /src/main/res/xml/network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config cleartextTrafficPermitted="true">
        <domain includeSubdomains="true">10.0.2.2</domain>
    </domain-config>
</network-security-config>

File AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bigdataetl.cards" >
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:networkSecurityConfig="@xml/network_security_config"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Alternative Solution

To connect an Android Emulator" to localhost, you can use the following steps:

1. Start the Android Emulator".
2. In the emulator, open" a terminal window by typing terminal in the search bar.
3. In the terminal window, type ifconfig and press Enter. This will display the network configuration for the emulator.
4. Look for the entry for eth0 or wlan0. This is the network interface for the emulator.
5. Find the IP address for the network interface. It will be in the format XXX.XXX.XXX.XXX.
6. On your local machine (the one running the emulator), open" a web browser and enter the following URL: http://XXX.XXX.XXX.XXX:3000, where XXX.XXX.XXX.XXX is the IP address you obtained in the previous step and 3000 is the port number of the localhost server.

Note: If you are using a physical Android" device rather than an emulator, you can use the same steps to connect to localhost, but you will need to use the IP address of your computer rather than the emulator’s IP address. You can find your computer’s IP address by typing ipconfig in a terminal window on your computer.

Android Emulator

Each instance of the Android Emulator" uses an Android" virtual device (AVD) to specify the Android" version and hardware characteristics of the simulated device. To effectively test your app, you should create an AVD that models each device on which your app is designed to run. To create and manage AVDs, use the Device Manager.

Each AVD functions as an independent device, with its own private storage for user" data, SD card, and so on. By default", the emulator stores the user" data, SD card data, and cache in a directory specific to that AVD. When you launch the emulator, it loads the user" data and SD card data from the AVD directory.

https://developer.android.com/studio/run/emulator

Android Application Development

During Android" application development I use the Android" Studio in combination with Android Emulator". It allows me to quickly do development tasks and I can deploy this application using one click to Android" environment.

Android Studio

Android" Studio is the best tool which can be used to develop Android" application. It’s based on the Intellij" IDEA, but develop and adapted for writing Android" application.

Android Studio can be installed on Windows", Mac and Linux" platforms.

System Requirements

The following table presents the Android" Studio ssystem requirements:

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