Android-还原片段WebView状态以避免重新加载

我有一个底部导航栏应用程序(用Android Studio模板创建)。应用程序在两个片段之间导航。在其中一个片段上,我有一个WebView,我希望避免每次导航到片段视图时都重新加载它。

阅读后 this article ,我尝试保存webview状态如下:

package com.example.bla.myapp.fragments;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import com.example.shlomishwartz.adintegration.R;

public class VideoFragment extends Fragment {
    private String PAGE_URL = "https://my.html.view.html";
    private Bundle webViewBundle;
    private WebView webView;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View videoFragment = inflater.inflate(R.layout.video_fragment, null);

        webView = (WebView) videoFragment.findViewById(R.id.video_webview);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        WebView.setWebContentsDebuggingEnabled(true);
        webView.setWebViewClient(new WebViewClient());

        // HERE IS WHERE I TRY TO RESTORE THE STATE

        if (webViewBundle == null) {
            webView.loadUrl(PAGE_URL);
        } else {
            webView.restoreState(webViewBundle);
        }
        return videoFragment;
    }

    @Override
    public void onPause() {

        // HERE IS WHERE I SAVE THE STATE

        super.onPause();
        webViewBundle = new Bundle();
        webView.saveState(webViewBundle);
    }

}

为空 然后重新加载HTML。