Is it good practice in Android to implement our own back button rather than using device's backbutton

Is it good practice in Android to implement our own back button rather than usin开发者_运维问答g device's backbutton. May I know what are the disadvantages of using our own back button in Application rather than device provided one.

Thanks in Advance,

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Is it good practice in Android to implement our own back button rather than using device's backbutton.

Absolutely not.

May I know what are the disadvantages of using our own back button in Application rather than device provided one.

1. Waste of screen space
2. Lack of design consistency with other Android apps

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As a user myself, I find it intuitive to use the back button because it is in use in all major applications. Futhermore, I find that adding another back button to serve the same function is a waste of screen real estate (and this is usually something you like to spare).