I want to change the pixel to dp, what should I do?

public static float convertDpToPixel(float dp, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = dp * (metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
    return px;
}

public static float convertPixelsToDp(float px, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float dp = px / (metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
    return dp;
}