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说明：由于本人是个小白，可能这个方法很多大佬都会，但是对于我们小白来说，有的时候一个问题要找好久还不一定能找到。。。拿这个来说，我找了好久都没有找到答案，最后机缘巧合下，才完成的。。。

创建Fragment过程就不说了，直接进入正题。因为加载网页需要用到webview组件，那我们首先在layout中创建一个，我这里以默认的fragment_gallery为代表。

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.gallery.GalleryFragment">

    <WebView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/web123"
        tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>

因为webview需要使用网络权限及用到的http或者https,我们需要在AndroidManifest中定义。加载http/https用到的是 android:usesCleartextTraffic=”true  其他的都是常用的权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        tools:ignore="ScopedStorage" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:usesCleartextTraffic="true"
        android:theme="@style/Theme.Hookvip"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:theme="@style/Theme.Hookvip.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>

</manifest>

接下来我们需要在GalleryFragment.java 中去实现webview，并且实现在app内下载.apk文件自动调用系统浏览器进行下载。

package com.vip.hookvip.ui.gallery;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.DownloadListener;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;

import com.vip.hookvip.databinding.FragmentGalleryBinding;

public class GalleryFragment extends Fragment {

    private FragmentGalleryBinding binding;

    @SuppressLint("SetJavaScriptEnabled")
    public View onCreateView(@NonNull LayoutInflater inflater,
                             ViewGroup container, Bundle savedInstanceState) {
        new ViewModelProvider(this).get(GalleryViewModel.class);

        binding = FragmentGalleryBinding.inflate(inflater, container, false);
        View root = binding.getRoot();

        //定义webviewID
        final WebView webView = binding.web123;
        //允许加载JavaScript
        WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        //定义下载动作
        webView.setDownloadListener(new MyWebViewDownLoadListener());
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });
        //加载外部网页
        webView.loadUrl("https://wwif.lanzouw.com/b00tr891a");
        return root;
    }



    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }
    //实现WebView中下载问题
    private class MyWebViewDownLoadListener implements DownloadListener {
        @Override
        public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
            Uri uri = Uri.parse(url);
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(intent);

        }
    }
}

好了，本次教程到此结束。