Android设备显示相关帮助类

public class DisplayHelper {
    
    
    public static final float DENSITY = Resources.getSystem()
            .getDisplayMetrics().density;
    
	 
    public static DisplayMetrics getDisplayMetrics(Context context) {
        return context.getResources().getDisplayMetrics();
    }

    
    public static int dpToPx(int dpValue) {
        return (int) (dpValue * DENSITY + 0.5f);
    }
    
     
    public static int pxToDp(float pxValue) {
        return (int) (pxValue / DENSITY + 0.5f);
    }
    
    
    public static int sp2px(Context context, int sp) {
        return (int) (getFontDensity(context) * sp + 0.5);
    }
    
    
    public static int px2sp(Context context, int px) {
        return (int) (px / getFontDensity(context) + 0.5);
    }
    
     public static float getDensity(Context context) {
        return context.getResources().getDisplayMetrics().density;
    }

    public static float getFontDensity(Context context) {
        return context.getResources().getDisplayMetrics().scaledDensity;
    }
    
     
    public static int getScreenWidth(Context context) {
        return getDisplayMetrics(context).widthPixels;
    }

    
    public static int getScreenHeight(Context context) {
        int screenHeight = getDisplayMetrics(context).heightPixels;
        if(QMUIDeviceHelper.isXiaomi() && xiaomiNavigationGestureEnabled(context)){
            screenHeight += getResourceNavHeight(context);
        }
        return screenHeight;
    }
    
     
    public static int getStatusBarHeight(Context context) {
        try {
            Class c = Class.forName("com.android.internal.R$dimen");
            Object obj = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = Integer.parseInt(field.get(obj).toString());
            if(x > 0){
                return context.getResources().getDimensionPixelSize(x);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
    
    private static int getResourceNavHeight(Context context){
        int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            return context.getResources().getDimensionPixelSize(resourceId);
        }
        return -1;
    }
    
     
    public static boolean deviceHasNavigationBar() {
        boolean haveNav = false;
        try {
            //1.通过WindowManagerGlobal获取windowManagerService
            // 反射方法：IWindowManager windowManagerService = WindowManagerGlobal.getWindowManagerService();
            Class windowManagerGlobalClass = Class.forName("android.view.WindowManagerGlobal");
            Method getWmServiceMethod = windowManagerGlobalClass.getDeclaredMethod("getWindowManagerService");
            getWmServiceMethod.setAccessible(true);
            //getWindowManagerService是静态方法，所以invoke null
            Object iWindowManager = getWmServiceMethod.invoke(null);

            //2.获取windowMangerService的hasNavigationBar方法返回值
            // 反射方法：haveNav = windowManagerService.hasNavigationBar();
            Class iWindowManagerClass = iWindowManager.getClass();
            Method hasNavBarMethod = iWindowManagerClass.getDeclaredMethod("hasNavigationBar");
            hasNavBarMethod.setAccessible(true);
            haveNav = (Boolean) hasNavBarMethod.invoke(iWindowManager);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return haveNav;
    }
    
    
}