java - 每次滑动刷新后，如何阻止 WebView 应用程序进入主页？

Question

每次我滑动刷新时，我的应用程序都会重新加载到主页，而不是重新加载相同的网页。我尝试了各种方法来检测这种行为，但找不到任何东西。你能说出这里的问题是什么吗？

滑动刷新应该只是刷新当前网页而不是整个应用程序吧？

主 Activity .java

package com.yoalfaaz.yoalfaaz;

        import android.content.Intent;
        import android.os.Bundle;
        import android.support.design.widget.FloatingActionButton;
        import android.support.design.widget.Snackbar;
        import android.support.v4.widget.SwipeRefreshLayout;
        import android.support.v7.app.AppCompatActivity;
        import android.support.v7.widget.ShareActionProvider;
        import android.support.v7.widget.Toolbar;
        import android.view.View;
        import android.view.Menu;
        import android.view.MenuItem;
        import android.webkit.WebSettings;
        import android.webkit.WebView;
        import android.webkit.WebViewClient;
        import android.support.v4.view.MenuItemCompat;

public class MainActivity extends AppCompatActivity {
    private WebView YoWeb;
    private ShareActionProvider mShareActionProvider;

    SwipeRefreshLayout swipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        swipe = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
        swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                LoadWeb();
            }
        });
        LoadWeb();
    }

    public void LoadWeb() {
        YoWeb = (WebView)findViewById(R.id.webview);
        WebSettings webSettings = YoWeb.getSettings();
        webSettings.setJavaScriptEnabled(true);
        YoWeb.loadUrl("https://www.yoalfaaz.com");
        swipe.setRefreshing(true);
        YoWeb.setWebViewClient(new WebViewClient() {

            //onPageFinished Method
            public void onPageFinished(WebView view, String url) {
                //Hide the SwipeRefreshLayout
                swipe.setRefreshing(false);
            }
        });
    }

    @Override
    public void onBackPressed() {
        if (YoWeb.canGoBack()) {
            YoWeb.goBack();
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        switch (item.getItemId()) {
            case R.id.action_settings:
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate menu resource file.
        getMenuInflater().inflate(R.menu.menu_main, menu);

        // Locate MenuItem with ShareActionProvider
        MenuItem item = menu.findItem(R.id.menu_item_share);

        // Fetch and store ShareActionProvider
        mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);

        // Return true to display menu
        return true;
    }

    // Call to update the share intent
    private void setShareIntent(Intent shareIntent) {
        if (mShareActionProvider != null) {
            mShareActionProvider.setShareIntent(shareIntent);
        }
    }

    //private Intent setShareIntent() {
    //    Intent shareIntent = new Intent();
    //    shareIntent.setAction(Intent.ACTION_SEND);
    //    shareIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
    //    shareIntent.setType("text/plain");
    //    startActivity(shareIntent);
    //    return shareIntent;
    //}
}

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.yoalfaaz.yoalfaaz.MainActivity"
    tools:showIn="@layout/activity_main">

    <android.support.v4.widget.SwipeRefreshLayout

        android:id="@+id/swiperefresh"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

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

    </android.support.v4.widget.SwipeRefreshLayout>
</android.support.constraint.ConstraintLayout>

这是负责滑动刷新的两个文件，您可以看到其中的所有代码。我希望您能够弄清楚这里的问题到底是什么。

Answer 1

您的 SwipeRefreshLayout.OnRefreshListener 正在调用 LoadWeb 方法。在 LoadWeb 中，您正在调用 YoWeb.loadUrl("https://www.yoalfaaz.com ");这意味着您总是将 webview 设置为在刷新时转到该 URL。将您的代码更改为如下所示:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    YoWeb = (WebView)findViewById(R.id.webview); // Move your declaration up here
    swipe = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
    swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            LoadWeb(YoWeb.getUrl());  // Pass in the current url to refresh
        }
    });

    LoadWeb("https://www.yoalfaaz.com");  // load the home page only once
}

public void LoadWeb(String url) // Pass in URL you want to load
{  

    WebSettings webSettings = YoWeb.getSettings();
    webSettings.setJavaScriptEnabled(true);
    YoWeb.loadUrl(url);  // Load the URL passed into the method
    swipe.setRefreshing(true);
    YoWeb.setWebViewClient(new WebViewClient() {

        //onPageFinished Method
        public void onPageFinished(WebView view, String url) {
            //Hide the SwipeRefreshLayout
            swipe.setRefreshing(false);
        }
    });
}