[Android] dp, px まわりの便利関数

LayoutUtils.java

public abstract class LayoutUtils {

    public static int getDisplayWidthPx() {
        return Resources.getSystem().getDisplayMetrics().widthPixels;
    }

    public static int getDisplayHeightPx() {
        return Resources.getSystem().getDisplayMetrics().heightPixels;
    }

    public static int getDisplayWidthDp() {
        return px2dp(Resources.getSystem().getDisplayMetrics().widthPixels);
    }

    public static int getDisplayHeightDp() {
        return px2dp(Resources.getSystem().getDisplayMetrics().heightPixels);
    }

    public static int dp2px(int dp){
        return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
    }

    public static int px2dp(int px){
        return (int) (px / Resources.getSystem().getDisplayMetrics().density);
    }

    public static int getPxFromDimension(Context context, @DimenRes int resource) {
        return context.getResources().getDimensionPixelSize(resource);
    }

    public static int getDpFromDimension(Context context, @DimenRes int resource) {
        return px2dp(context.getResources().getDimensionPixelSize(resource));
    }
}