android 常用util方法

public static int convertPxToDp(int px) {
DisplayMetrics metrics = DemoApplication.getInstance().getAppResources().getDisplayMetrics();
float logicalDensity = metrics.density;
int dp = Math.round(px / logicalDensity);
return dp;
}

public static int convertDpToPx(int dp) {
return Math.round(
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
DemoApplication.getInstance().getAppResources().getDisplayMetrics())
);
}