To change progressbar loading color of android just post this 3 line of code in your xml file where progress bar is located
android:indeterminate="true" android:indeterminateTintMode="src_atop" android:indeterminateTint="@color/colorAccent"
before adding this progress bar will be look like
<ProgressBar android:id="@+id/progressBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_gravity="center" android:progressDrawable="@drawable/circular_progress_bar" />
after adding this progress bar will be look like
<ProgressBar android:id="@+id/progressBar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:indeterminate="true" android:indeterminateTintMode="src_atop" android:indeterminateTint="@color/metirial_blue" android:layout_gravity="center" android:progressDrawable="@drawable/circular_progress_bar" />
at the place of cplopr_accent add any color you want..
Done.. you successfully changed the progress bar color