android：获取屏幕分辨率，屏幕密度

DisplayMetrics dm = getResources().getDisplayMetrics();

int screenWidth = dm.widthPixels;

int screenHeight = dm.heightPixels;
Log.d("liudezu","==========屏幕分辨率："+"("+screenWidth+","+screenHeight+")\n");
Log.d("liudezu","==========屏幕密度"+dm.density
+" 屏幕dpi:"+dm.densityDpi);

android.os.Build的一些常使用常量：

	BOARD	The name of the underlying board, like "goldfish".主板名称
	BOOTLOADER	The system bootloader version number.系统引导程序版本号
	BRAND	The brand (e.g., carrier) the software is customized for, if any.android系统定制商
	CPU_ABI	The name of the instruction set (CPU type + ABI convention) of native code.CPU 和ABI的本地代码指令集
	CPU_ABI2	The name of the second instruction set (CPU type + ABI convention) of native code.
	DEVICE	The name of the industrial design.设备参数
	DISPLAY	A build ID string meant for displaying to the user显示屏参数
	FINGERPRINT	A string that uniquely identifies this build.硬件名
	HARDWARE	The name of the hardware (from the kernel command line or /proc).内核命令行中的硬件名
	HOST
	ID	Either a changelist number, or a label like "M4-rc20".修改版本列表
	MANUFACTURER	The manufacturer of the product/hardware.硬件厂商
	MODEL	The end-user-visible name for the end product.版本
	PRODUCT	The name of the overall product.手机厂商
	RADIO	This field was deprecated in API level 14. The radio firmware version is frequently not available when this class is initialized, leading to a blank or "unknown" value for this string. Use  getRadioVersion()  instead.
	SERIAL	A hardware serial number, if available.