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") + "]";
}
}