判断是否有虚拟按键并获得虚拟按键高度

public class VirtualBar {
    /**
     * 获取是否存在NavigationBar
     * @param context
     * @return
     */
    public static boolean checkDeviceHasNavigationBar(Context context) {
        boolean hasNavigationBar = false;
        Resources rs = context.getResources();
        int id = rs.getIdentifier("config_showNavigationBar", "bool", "android");
        if (id > 0) {
            hasNavigationBar = rs.getBoolean(id);
        }
        try {
            Class systemPropertiesClass = Class.forName("android.os.SystemProperties");
            Method m = systemPropertiesClass.getMethod("get", String.class);
            String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys");
            if ("1".equals(navBarOverride)) {
                hasNavigationBar = false;
            } else if ("0".equals(navBarOverride)) {
                hasNavigationBar = true;
            }
        } catch (Exception e) {

        }
        return hasNavigationBar;
    }

    /**
     * 获取虚拟功能键高度
     * @param context
     * @return
     */
    public static int getVirtualBarHeight(Context context) {
        int vh = 0;
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        DisplayMetrics dm = new DisplayMetrics();
        try {
            @SuppressWarnings("rawtypes")
            Class c = Class.forName("android.view.Display");
            @SuppressWarnings("unchecked")
            Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
            method.invoke(display, dm);
            vh = dm.heightPixels - windowManager.getDefaultDisplay().getHeight();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return vh;
    }
}