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java.lang.IllegalStateException: Bindings already cleared. 2021-01-28

2021/1/28 14:48:23   来源:

java.lang.IllegalStateException: Bindings already cleared.

使用 ButterKnife 从 7.x.x 升级到 10.x.x 后,某个 viewPager 中的
的 Fragment 方法报以下错误:

java.lang.IllegalStateException: Bindings already cleared.

查看代码git历史,是从

 ButterKnife.unbind(this);

变为了

  unbinder.unbind();

然后发现,

父类:

@Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

子类

  @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

中都调用了 unbinder.unbind();
猜测是因为父类已经执行过unbind()了,子类再去执行unbind()引发的异常。

所以跳进 unbind() 查看源码:

public interface Unbinder {
  @UiThread void unbind();

  Unbinder EMPTY = () -> { };
}

选中unbind,然后用快捷键 option+command+B,跳到实现中:

@Override
  @CallSuper
  public void unbind() {
    AbsWebViewActivity target = this.target;
    if (target == null) throw new IllegalStateException("Bindings already cleared.");
    this.target = null;

    target.mWebView = null;
    target.tvLoadFail = null;
    target.btnLoadAgain = null;
    target.llLoadError = null;
    target.llProgressbar = null;
  }

果然发现了new IllegalStateException("Bindings already cleared.");

所以子类删除 unbinder.unbind()就可以了,子类修改如下:

  @Override
    public void onDestroyView() {
        super.onDestroyView();
        // unbinder.unbind();
    }