Android || 3- Internal Data Storage How to Save String Into txt File inside android device

Storage Options
Android provides several options for you to save persistent application data.

2- Using the Internal Storage
Store private data on the device memory.

For More information revise this document into Android developer website :

[gabrielgonoring]

this save mode data is not working on Android 6 or higher.

need permission to write in memory or not to use in android 6 or higher?

[venkittus]

you've any tutorial for payment gateway

[venkittus]

for me i can't find the file in android device emulator

[venkittus]

when i use mobile with api 19 i can't get the file