在网页中向上滚动iframe对象以触发SwipeRefreshLayout中的刷新

问题描述

我在SwipeRefreshLayout中使用webview创建了一个应用程序。网页具有包含pdf内容的iframe。网页正在正确地上下滚动。向下滚动iframe pdf内容一切正常，但向上滚动则触发刷新操作。如何解决呢？ [问题演示] [1]

<?xml version="1.0" encoding="utf-8"?>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swiperefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <WebView
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

package com.project.test;

import android.Manifest;
import android.app.AlertDialog;
import android.app.DownloadManager;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.webkit.CookieManager;
import android.webkit.DownloadListener;
import android.webkit.URLUtil;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;

public class MainActivity extends AppCompatActivity {
    private WebView mywebView;
    SwipeRefreshLayout mySwipeRefreshLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mySwipeRefreshLayout = (SwipeRefreshLayout)this.findViewById(R.id.swiperefresh);

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    == PackageManager.PERMISSION_DENIED) {
                Log.d("permission","permission denied to WRITE_EXTERNAL_STORAGE - requesting it");
                String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
                requestPermissions(permissions,1);
            }
        }

        mywebView=(WebView) findViewById(R.id.webview);
        mywebView.setWebViewClient(new WebViewClient());
        mywebView.loadUrl("http://myblog.drharsha.in/index.PHP/2020/09/02/covid-19-sop-for-conducting-examinations/");
        WebSettings webSettings=mywebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setBuiltInZoomControls(true);
        mywebView.getSettings().setdisplayZoomControls(false);
        webSettings.setSupportZoom(true);
        mywebView.getSettings().setLoadWithOverviewmode(true);
        mywebView.getSettings().setUseWideViewPort(true);

        mySwipeRefreshLayout.setonRefreshListener(
                new SwipeRefreshLayout.OnRefreshListener() {
                    @Override
                    public void onRefresh() {
                        mywebView.reload();
                        mySwipeRefreshLayout.setRefreshing(false);
                    }
                }
        );

        mywebView.setDownloadListener(new DownloadListener()
        {
            @Override
            public void onDownloadStart(String url,String userAgent,String contentdisposition,String mimeType,long contentLength) {
                DownloadManager.Request request = new DownloadManager.Request(
                        Uri.parse(url));
                request.setMimeType(mimeType);
                String cookies = CookieManager.getInstance().getCookie(url);
                request.addRequestHeader("cookie",cookies);
                request.addRequestHeader("User-Agent",userAgent);
                request.setDescription("Downloading File...");
                request.setTitle(URLUtil.guessFileName(url,contentdisposition,mimeType));
                request.allowScanningByMediaScanner();
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setDestinationInExternalPublicDir(
                        Environment.DIRECTORY_DOWNLOADS,URLUtil.guessFileName(
                                url,mimeType));
                DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
                dm.enqueue(request);
                Toast.makeText(getApplicationContext(),"Downloading File",Toast.LENGTH_LONG).show();
            }
        });

    }
    
    @Override
    public void onBackpressed(){
        if(mywebView.canGoBack()) {
            mywebView.goBack();
        }
        else{
            new AlertDialog.Builder(this)
                    .setMessage("Are you sure you want to exit?")
                    .setNegativeButton(android.R.string.no,null)
                    .setPositiveButton(android.R.string.yes,new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface arg0,int arg1) {
                            MainActivity.super.onBackpressed();
                        }
                    }).create().show();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.project.test">
    <uses-permission android:name="android.permission.INTERNET">
    </uses-permission>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE">
    </uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE">
    </uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
    </uses-permission>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:usesCleartextTraffic="true">
        <activity android:name=".SplashScreen"
            android:theme="@style/SplashTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

请帮助提供代码.... [1]：https://i.stack.imgur.com/Wen2Q.gif

解决方法

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