Android中showDialog()报错is your activity running?

判断一下Activity是否在finishing就好了，否则万一Activity销毁了，这个Dialog没有所依附的对象，就会有下面的异常抛出

android.view.WindowManager$BadTokenException: 
Unable to add window — token android.os.BinderProxy@447a6748 is not valid; is your activity running?
at android.view.ViewRoot.setView(ViewRoot.java:468)

如下修改就不会报错了

private Handler myHandler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
    switch (msg.what) {
      case DISPLAY_DLG:
        if (!isFinishing()) {
        showDialog(MY_DIALOG);
        }
      break;
    }
  }
};