AndroidDatePicker-

public ChangeTextStyleNumberPicker(Context context) {
    super(context);
}

public ChangeTextStyleNumberPicker(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public ChangeTextStyleNumberPicker(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

@Override
public void addView(View child) {
    super.addView(child);
    updateView(child);
}

@Override
public void addView(View child, ViewGroup.LayoutParams params) {
    super.addView(child, params);
    updateView(child);
}

@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
    super.addView(child, index, params);
    updateView(child);
}

private void updateView(View view) {
    if (view instanceof EditText) {
        ((EditText) view).setTextSize(16);