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The following code snippet shows how to converts DP unit to equivalent pixels, depending on device density. It returns a float value to represent px equivalent to dp depending on device density.

public static float convertDpToPixel(float dp, Context context){
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = dp * (metrics.densityDpi / 160f);
    return px;
}