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androidpixeldensity-independent-pixel

How to convert DP, PX, SP among each other, especially DP and SP?

I have known the difference among DP, SP and PX. And after searching this topic, I found nothing satisfying me completely. Maybe this post is a duplicate, but I still want to know what is the formula of converting from DP to PX, and DP to SP, from SP to PX, from PX to SP, from SP to DP, from DP to SP? I have known some codes to do this, but they are imperfect.

Solution

  • DP to PX: 

    public static int dpToPx(float dp, Context context) {
    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources().getDisplayMetrics());
}

    SP to PX:

    public static int spToPx(float sp, Context context) {
    return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp, context.getResources().getDisplayMetrics());
}

    DP to SP:

    public static int dpToSp(float dp, Context context) {
    return (int) (dpToPx(dp, context) / context.getResources().getDisplayMetrics().scaledDensity);
}