How to close activity and go back to previous activity in android

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I think you are calling finish() method in MainActivity before starting SettingsActivity.

The scenario which you have described will occur in following two ways:

EITHER

You have set android:noHistory = "true" for MainActivity inside AndroidManifest.xml which causes MainActivity to finish automatically on pressing the back key.

OR

Before switching to your ‘SettingsActivity’, you have called finish() in your MainActivity, which kills it. When you press back button,since no other activity is preset in stack to pop, it goes back to main screen.

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