How to change the default color of DatePicker and TimePicker dialog in Android?

The best way to change the picker dialog is by adding custom style to it.

<style name="TimePickerTheme" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">@color/color_primary</item>
    <item name="android:layout_width">wrap_content</item>
    <item name="android:layout_height">wrap_content</item>
</style>

TimePickerDialog timePicker = new TimePickerDialog(mContext, R.style.TimePickerTheme, fromListener, hour, min, false);

Worked perfectly for me.