获取Android设备屏幕宽、高、dpi密度及横竖屏等参数详解编程语言

获取Android设备屏幕宽、高、dpi密度及横竖屏等参数。

 
 
功能 
 
获取Android设备屏幕宽、高、dpi密度及横竖屏等参数 
 
代码 
 
/** 
* 系统参数类 
* 
* @author wader 
* 
*/ 
public class MySystemParams { 
private final String TAG = "SystemParams"; 
private static MySystemParams params; 
public int screenWidth;// 屏幕宽度，单位为px 
public int screenHeight;// 屏幕高度，单位为px 
public int densityDpi;// 屏幕密度，单位为dpi 
public float scale;// 缩放系数，值为 densityDpi/160 
public float fontScale;// 文字缩放系数，同scale 
 
public final static int SCREEN_ORIENTATION_VERTICAL = 1; // 屏幕状态：横屏 
public final static int SCREEN_ORIENTATION_HORIZONTAL = 2; // 屏幕状态：竖屏 
public int screenOrientation = SCREEN_ORIENTATION_VERTICAL;// 当前屏幕状态，默认为竖屏 
 
/** 
* 私有构造方法 
* 
* @param activity 
*/ 
private MySystemParams(Activity activity) { 
DisplayMetrics dm = new DisplayMetrics(); 
activity.getWindowManager().getDefaultDisplay().getMetrics(dm); 
screenWidth = dm.widthPixels; 
screenHeight = dm.heightPixels; 
densityDpi = dm.densityDpi; 
scale = dm.density; 
fontScale = dm.scaledDensity; 
 
screenOrientation = screenHeight > screenWidth ? SCREEN_ORIENTATION_VERTICAL 
: SCREEN_ORIENTATION_HORIZONTAL; 
} 
 
/** 
* 获取实例 
* 
* @param activity 
* @return 
*/ 
public static MySystemParams getInstance(Activity activity) { 
if (params == null) { 
params = new MySystemParams(activity); 
} 
return params; 
} 
 
/** 
* 获取一个新实例 
* 
* @param activity 
* @return 
*/ 
public static MySystemParams getNewInstance(Activity activity) { 
if (params != null) { 
params = null; 
} 
return getInstance(activity); 
} 
 
/** 
* 参数信息 
*/ 
public String toString() { 
 
return TAG 
+ ":[screenWidth: " 
+ screenWidth 
+ " screenHeight: " 
+ screenHeight 
+ " scale: " 
+ scale 
+ " fontScale: " 
+ fontScale 
+ " densityDpi: " 
+ densityDpi 
+ " screenOrientation: " 
+ (screenOrientation == SCREEN_ORIENTATION_VERTICAL ? "vertical" 
: "horizontal") + "]"; 
} 
}