Fragment not attached to a context

最新推荐文章于 2022-02-24 12:20:11 发布

原创最新推荐文章于 2022-02-24 12:20:11 发布 · 8.1k 阅读

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本文探讨了在DialogFragment中因onDestroy导致失去与Activity绑定，从而无法通过requireContext()获取context的问题。提供了使用application作为context的解决方案，确保在任何情况下都能顺利进行apk安装。

源码：

/**
     * Return the {@link Context} this fragment is currently associated with.
     *
     * @throws IllegalStateException if not currently associated with a context.
     * @see #getContext()
     */
    @NonNull
    public final Context requireContext() {
        Context context = getContext();
        if (context == null) {
            throw new IllegalStateException("Fragment " + this + " not attached to a context.");
        }
        return context;
    }

/**
     * Return the {@link Context} this fragment is currently associated with.
     *
     * @see #requireContext()
     */
    @Nullable
    public Context getContext() {
        return mHost == null ? null : mHost.getContext();
    }

原因：在DialogFragment中下载apk安装包的回调中有安装功能，安装apk需要context，从requireContext获取，但是此时DialogFragment已经onDestroy了，失去了与Activity的绑定，因此抛出异常。

解决：传入application作为context安装时所需context