android - 使用可折叠工具栏和页面适配器时请求布局调用不当

Question

我遇到以下错误的无限循环:

W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatTextView{9968cfe V.ED..... ......ID 64,0-1376,301 #7f0c008a app:id/project_name} during layout: running second layout pass
I/ViewRootImpl: requestLayoutDuringLayout is already in process
I/ViewRootImpl: requestLayoutDuringLayout is already in process
I/ViewRootImpl: requestLayoutDuringLayout is already in process

我有一个 CoordinatorLayout，它在 AppBarLayout 中包含一个 CollapsingToolbarLayout。在 AppBarLayout 之外，我有一个 ViewPager。当 CollapsingToolbarLayout 折叠时，上面的错误消息开始无限循环。

当 CollapsingToolbarLayout 关闭时，我有一个监听器，以便我可以隐藏和显示一些 View 。

@Override public void onOffsetChanged(final AppBarLayout appBarLayout, final int verticalOffset) {
    if (scrollRange == -1) {
        scrollRange = appBarLayout.getTotalScrollRange();
    }

    if (scrollRange + verticalOffset == 0 && !isShow) {
        view.showToolbarTitle(true);
        isShow = true;
    } else if (isShow) {
        view.showToolbarTitle(false);
        isShow = false;
    }
}

当我删除此监听器时，错误就会停止。我假设正在发生的事情是 onOffsetChanged(AppBarLayout, int) 在 CollapsingToolbarLayout 折叠时不断被调用。但这没有任何意义，因为没有任何偏移量被更改。有谁知道为什么会发生这种情况？

Answer 1

对于 Kotlin 如果您在此处设置任何 View 的值，它将充满 requestLayout 进程警告。您可以尝试查看可见性 gone/visible。

private fun addListener(){
        var isShow = false
        var scrollRange = -1
        tvUserTitle.text = "Hasnine"

        ioCoroutineScope.launch {
            appBar.addOnOffsetChangedListener(AppBarLayout.OnOffsetChangedListener { barLayout, verticalOffset ->


                if (scrollRange == -1) {
                    scrollRange = barLayout?.totalScrollRange!!
                }
                if (scrollRange + verticalOffset == 0) {
                    //tvTitleHome.title = "Hasnine"
                    //toolbarCollapse.title = "hello world"

                    isShow = true
                    showTitle(isShow)

                } else if (isShow) {
                    //tvTitleHome.title = "" //careful there should a space between double quote otherwise it wont work

                    isShow = false
                    showTitle(isShow)
                }
            })
        }
}

private fun showTitle(show: Boolean){
        if(show){
            tvUserTitle.visibility = View.VISIBLE
        }else{
            tvUserTitle.visibility = View.GONE
        }
    }