Back button in Android
<p>I have seen couple of Android applications when I came across one common practice. Navigation header does not have a <strong>Back button</strong>. Since then I was quite confused so as to place the same in the Navigation header of my application.<br>
Should back button be placed in Navigation (Header) or we should leave keys to handle it? What is the best practice we should follow?  </p>

<p>Thanks</p>
