Write an Android application

batch edit of 10 files maximum, in Android based mobiles. ( from 4.4 till 6 ) I want to be able to change existing files ( which I will choose at first run ) into my data in one click. This request came after I started using Kodi Wizard updates. the wizards are overriding my settings for TRAKT, SUBtitle addons and USERDATA. When choosing a file at first, I want to be able to see it's content, change the specific string into my string. exmple: file1 is located at: * storage/emulated/0/Android/data/[login to view URL] * location can be different on other Android based mobiles - Because of that, I need to choose. file content after update: <settings> <setting id="password" value="" /> <setting id="username" value="" /> <settings> file content before update: <settings> <setting id="password" value="123" /> <setting id="username" value="abc" /> <settings> file2 is located at: * storage/emulated/0/Android/data/[login to view URL] * location can be different on other Android based mobiles - Because of that, I need to choose. file content after update: <settings> <setting id="password" value="123" /> <setting id="username" value="abc" /> <settings> file content before update: <settings> <setting id="password" value="321" /> <setting id="username" value="cba" /> <settings>