片段改变后WebView消失

Question

在我的应用程序中，我有一个带有webview的片段。比方说片段A。当我进入片段B并回到片段A时，webview消失了。我试过webview restoreState()，但它不起作用。它只是显示空的空间。

   private var webViewBundle: Bundle? = null

   override fun onPause() {
        super.onPause()
        webViewBundle = Bundle()
        webView.saveState(webViewBundle)
    }


    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        setupWebView()
    }


private fun setupWebView() {
   // webview client
if(webViewBundle != null) {
            webView.restoreState(webViewBundle)
        } else {
            searchView.setQuery(viewModel.url.value, true)
            webView.loadUrl(searchView.query.toString())
        }

}


// change fragment
replaceFragment(
                FragmentBNewInstance(),
                DashboardActivity.FRAGMENT_RESOURCE_ID,
                true,
                DashboardActivity.FRAGMENT_BACKSTACK
            )


// method to replace fragment
    fun replaceFragment(fragment: Fragment?, resId: Int, addToBackstack: Boolean, tag: String) {
        try {
            if (fragment != null) {
                val ft = supportFragmentManager.beginTransaction()
                ft.replace(resId, fragment)
                if (addToBackstack) {
                    ft.addToBackStack(tag)
                }
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
                ft.commit()
            }
        } catch (e: Exception) {
        }

    } 

Answer 1

与其替换片段，不如使用add函数添加片段。

 if (fragment != null) {
 val ft = supportFragmentManager.beginTransaction()
 ft.add(resId, fragment)
 if (addToBackstack) {
     ft.addToBackStack(tag)
 }
 ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE)
 ft.commit()
}