There are methods in an effort to cast off account. One is to reset your smartphone and the other is to delete your account. The former will clear all your documents within the inner garage, and isn't always surprisingly recommended in case you just need to delete Gmail on Android. Here, we will specifically focus at the latter one.
Steps : Settings > Accounts > Google > Choose your Google account > Remove account
Now I will walk you via the details about removing account from Android.
Step 1 : Go to "Settings" > "Accounts". Select "Google" and pick out the account you need.
Step 2 : Tap the menu icon. Select "Remove account".
Step 3 : Click "Remove account" on the pop up and affirm to delete your Google account from Android. Note that eliminating the account will delete all of its messages, contacts, and different statistics from the tool.