A Sample Update data in Firebase For android, in response for this question on Stackoverflow: https://stackoverflow.com/questions/48576560/how-to-update-child-node-data-in-firebase-database/
The application demonstrates that onclick of a button the attribute done will be updated to true and no new node will be created(after clicking the button).
The application is done to test the update of the database. Therefore on launch of the application a new random id using push() is created.
Sample Database:
rootnode
users
123456789
Tasks
pushid
done: false
name: task 1
priority: 5
On relaunch of the application another pushid will be created with the same data.
On click of the button done attribute will be updated to true and no new node will be created