We always have different activities in our application and they are not present in home screen , so we have to provide navigation between our apps , so the user can return to the desired screen.
We need to create a logical pattern in AndroidMainfest.xml file. So to open this file go to app>mainfest>AndroidMainfest.xml , now go to activity tag for
SecondActivity (your secondary activity) and add this code
<activity android:name=".SecondActivity" android:parentActivityName=".MainActivity" > <meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".MainActivity" /> </activity>
Now Android system will add navigation button automatically in you app.