最近做的项目要求进入应用后要如果有虚拟键的话，需要隐藏掉，于是翻阅资料解决了此问题。在此记录一下。

public class ScreenUtil {
    /**
      * <P>shang</P>
      * <P>判断是否有虚拟按键</P>
      * @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;
      }

 /**
   * <P>shang</P>
   * <P>解决虚拟按键问题</P>
   * @param window
   */
   public static void solveNavigationBar(Window window) {

       //布局位于状态栏下方
       int uiOptions =
              View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        //全屏
                         | View.SYSTEM_UI_FLAG_FULLSCREEN
                         //隐藏导航栏
                         | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                         | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
       if (Build.VERSION.SDK_INT>=19){
            uiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

            //保持布局状态
             uiOptions |= View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
        }else{

            uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
        }
        window.getDecorView().setSystemUiVisibility(uiOptions);
     }
}

使用方法：

 if (ScreenUtil.checkDeviceHasNavigationBar(this)) {
      ScreenUtil.solveNavigationBar(getWindow());
  }