Mobile testing have lot of challenges but it is very easy and enjoyable. Instead of testing mobiles manually we can use automation tools like Logcat. By using this tool you can see all log related to Android application. It is possible to check the request to API is correct or not or you can check the unwanted information is send or received. You can also find the performance related issues.
Specific activity filter by activity:
adb logcat -s Retrofit
adb logcat ActivityManager:I Retrofit:D *:S
Specific activity filter and specific virtual device:
adb -d devices
adb -s 192.168.56.101:5555 logcat -s Retrofit