Android progressbar in button

I was having the same problem, so I created a specialized button for this: LoadingProgressButton

Include the button like this:

    <br.com.simplepass.loading_button_lib.CircularProgressButton
android:id="@+id/btn_id"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:background="@drawable/circular_border_shape"
     app:spinning_bar_width="4dp" <!-- Optional -->
     app:spinning_bar_color="#FFF" <!-- Optional -->
     app:spinning_bar_padding="6dp" <!-- Optional -->

And use it like this:

    CircularProgressButton btn = (CircularProgressButton) findViewById(R.id.btn_id)
            btn.startAnimation(); 
                [do some async task. When it finishes]

                 //You can choose the color and the image after the loading is finished
                 btn.doneLoagingAnimation(fillColor, bitmap);
                 [or just revert de animation]
                 btn.revertAnimation();