Dp Pixel on Android

Basically, I forgot how to translate this every time on Android platform.
Cause on android platform, if you setup layout in xml file, you don’t need to care about this. Just forget about that.

But if you need to use dp-pixel converter in program, now here is the swiss army knife.

/**
 * convert dp to pixel
 * @param dp
 * @param context
 * @return pixel value
 */
public static float convertDpToPixel(float dp, Context context){
    float px = dp * getDensity(context);
    return px;
}

/**
 *
 * convert pixel to dp
 * @param pixel
 * @param context
 * @return dp value
 */
public static float convertPixelToDp(float px, Context context){
    float dp = px / getDensity(context);
    return dp;
}

/**
 *
 * get system density value
 * @param context
 * @return desity value
 */
public static float getDensity(Context context) {
        DisplayMetrics metrics = new DisplayMetrics();
((Activity)context).getWindowManager().getDefaultDisplay().getMetrics(metrics);
        return metrics.density;
    }

References:
[Android DisplayMetrics]
https://developer.android.com/reference/android/util/DisplayMetrics.html
[Android Screen Support]
https://developer.android.com/guide/practices/screens_support.html
[Online computing tool]
https://pixplicity.com/dp-px-converter/

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