android px转dp

public final class UIUtil {
public UIUtil() {
}

public static int dip2px(Context context, double dpValue) {
    float density = context.getResources().getDisplayMetrics().density;
    return (int)(dpValue * (double)density + 0.5D);
}

public static int getScreenWidth(Context context) {
    return context.getResources().getDisplayMetrics().widthPixels;
}

}