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public class PixelUtils {
	private static Context mContext = MyApplication.getInstance();

	// dp->px
	public static int dp2px(float value) {
 		final float scale = mContext.getResources().getDisplayMetrics().densityDpi;
        return (int) (value * (scale / 160) + 0.5f);
	}
	// dp->px
	public static int dp2px(float value, Context context) {
        final float scale = context.getResources().getDisplayMetrics().densityDpi;
        return (int) (value * (scale / 160) + 0.5f);
    }
    // px->dp
    public static int px2dp(float value) {
        final float scale = mContext.getResources().getDisplayMetrics().densityDpi;
        return (int) ((value * 160) / scale + 0.5f);
    }
    // px->dp
    public static int px2dp(float value, Context context) {
        final float scale = context.getResources().getDisplayMetrics().densityDpi;
        return (int) ((value * 160) / scale + 0.5f);
    }
    // sp->px
    public static int sp2px(float value) {
        Resources r;
        if (mContext == null) {
            r = Resources.getSystem();
        } else {
            r = mContext.getResources();
        }
        float spvalue = value * r.getDisplayMetrics().scaledDensity;
        return (int) (spvalue + 0.5f);
    }
    // sp->px
    public static int sp2px(float value, Context context) {
        Resources r;
        if (context == null) {
            r = Resources.getSystem();
        } else {
            r = context.getResources();
        }
        float spvalue = value * r.getDisplayMetrics().scaledDensity;
        return (int) (spvalue + 0.5f);
    }
    // px->sp 
	public static int px2sp(float value) {
        final float scale = mContext.getResources().getDisplayMetrics().scaledDensity;
        return (int) (value / scale + 0.5f);
    }
    // px->sp
    public static int px2sp(float value, Context context) {
        final float scale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (value / scale + 0.5f);
    }
}
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