Android如何解决虚拟按键栏遮挡问题

public class ScreenUtils {
  //获取虚拟按键的高度
  public static int getNavigationBarHeight(Context context) {
    int result = 0;
    if (hasNavBar(context)) {
      Resources res = context.getResources();
      int resourceId = res.getIdentifier("navigation_bar_height", "dimen", "android");
      if (resourceId > 0) {
        result = res.getDimensionPixelSize(resourceId);
      }
    }
    return result;
  }

  /**
   * 检查是否存在虚拟按键栏
   *
   * @param context
   * @return
   */
  @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
  public static boolean hasNavBar(Context context) {
    Resources res = context.getResources();//读取系统资源函数
    int resourceId = res.getIdentifier("config_showNavigationBar", "bool", "android");//获取资源id
    if (resourceId != 0) {
      boolean hasNav = res.getBoolean(resourceId);
      // check override flag
      String sNavBarOverride = getNavBarOverride();
      if ("1".equals(sNavBarOverride)) {
        hasNav = false;
      } else if ("0".equals(sNavBarOverride)) {
        hasNav = true;
      }
      return hasNav;
    } else { // fallback
      return !ViewConfiguration.get(context).hasPermanentMenuKey();
    }
  }

  /**
   * 判断虚拟按键栏是否重写
   * @return
   */
  private static String getNavBarOverride() {
    String sNavBarOverride = null;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      try {
        Class c = Class.forName("android.os.SystemProperties");
        Method m = c.getDeclaredMethod("get", String.class);
        m.setAccessible(true);
        sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
      } catch (Throwable e) {
      }
    }
    return sNavBarOverride;
  }
}

//处理虚拟按键
//判断用户手机机型是否有虚拟按键栏       
 if(ScreenUtils.hasNavBar(getApplicationContext())){
  setNavigationBar();
  }

 //处理虚拟按键
 private void setNavigationBar() {
  int barHeight = ScreenUtils.getNavigationBarHeight(getApplicationContext());
  LinearLayout.LayoutParams barParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
  TextView tv = new TextView(this);
  tv.setHeight(barHeight);
  tv.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
  tv.setBackgroundColor(Color.BLACK);
  llNavigationBar.addView(tv,barParams);
 }