Environment

Android Studio version: Giraffe

Language: Java

Minimum SDK : API 29("Q";Android 10.0)

Build configuration language: Kotlin DSL (build.gradle.kts)[Recommended]

Dependencies

retrofit2

Connect to Java RESTFul API

glide

Download image

google-play-services-location

Access user location.

For send latitude & longitude to Java RESTFul API using Android Studio Emulator, you need change the location manually.

configure your base url

private static Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("http://your ipv4 address:8080")
        .addConverterFactory(GsonConverterFactory.create())
        .client(okHttpClient)
        .build();

How to get your ipv4 address?
Open command line, enter "ipconfig", press enter key, then you will see your ipv4 adress. 
Replace baseUrl in Retrofit.Builder() with your own address.

Use adb cmd tool to fake/change location

adb emu geo fix <longitude value> <latitude value>

1. Run your Emulator first

2. Find your android sdk path:

    File -> Settings -> search "SDK" -> Android sdk location -> Your-sdk-location/platform-tools/
    
    e.g. 
    C:\Users\Administrator\AppData\Local\Android\Sdk\platform-tools
   

3. Open cmd, cd to your android-sdk/platform-tools/

4. Enter adm cmd line as above, replace latitude and longitude with the value you wanna test

if your cmd reply with "Ok", refresh Android app for new location.

Address for test:

1.NUS ISS: 
	adb emu geo fix 103.7765463525867 1.2924819296813213

2.NUS Central Liabrary: 
	adb emu geo fix 103.77323700691245  1.2968707431558482
	
3.College Avenue West, Education Resource Centre, Singapore: 
	adb emu geo fix 103.77269738327577 1.3059057415194406
	
4.Vivo City: 
	adb emu geo fix 103.82212859172847 1.265141682514245