Question

我正在Android 上开发一个简单的 WebView应用，该应用带有两个标签，一个显示网站，第二个显示XML文件，以输出所有最新新闻。

其中一篇文章中有一个 Google照片的相册链接，但是当我单击该链接时，图像中会显示错误。我不明白为什么它不能简单地加载链接。

偶然地，我也尝试阅读有关“意图”，“ DeepLink” 的 Google文档，因为我想使用 pre安装的应用程序“照片” ，并允许用户直接从官方的照片应用程序观看相册。

Answer 1

这是我的MainActivity.java

  package com.example.matte.parrocchiasanbenedetto;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.annotation.IntDef;
import android.support.design.widget.TabLayout;
import android.support.design.widget.TabLayout.Tab;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.webkit.URLUtil;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    //private ConstraintLayout container;
    public TabLayout tabLayout;
    public WebView myWebView;
    public SwipeRefreshLayout mySwipeRefreshLayout;
    //public TextView myTxtView;
    private Tab[] tabItem;
    final int[] ICONS = new int[]{
            R.drawable.ic_church,
            R.drawable.ic_feed
    };
    private String[] url;
    private static final int WEBSITE = 0, FEED = 1;
    @IntDef({WEBSITE, FEED})
    @Retention(RetentionPolicy.SOURCE)
    public @interface Operation {}


    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        url = new String[]{getString(R.string.url0), getString(R.string.url1)};

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        tabLayout = findViewById(R.id.tabs);
        mySwipeRefreshLayout = findViewById(R.id.swiperefresh);

        myWebView = findViewById(R.id.webView);
        myWebView.getSettings().setBuiltInZoomControls(true);
        myWebView.getSettings().setDisplayZoomControls(false);
        myWebView.getSettings().setLoadWithOverviewMode(true);
        myWebView.getSettings().setUseWideViewPort(true);
        myWebView.setPadding(0, 0, 0, 0);
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

        //myWebView.setWebViewClient(new WebViewClient());
        myWebView.setWebChromeClient(new WebChromeClient(){

        });

        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(Tab tab) {
                switch (tabLayout.getSelectedTabPosition()) {
                    case WEBSITE: {
                        myWebView.loadUrl(url[tabLayout.getSelectedTabPosition()]);
                        break;
                    }
                    case FEED: {
                        try {
                            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                            StrictMode.setThreadPolicy(policy);
                            readFeed();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        break;
                    }
                }
            }

            @Override
            public void onTabUnselected(Tab tab) {
            }

            @Override
            public void onTabReselected(Tab tab) {

            }
        });

        mySwipeRefreshLayout.setOnRefreshListener(
                new SwipeRefreshLayout.OnRefreshListener() {
                    @Override
                    public void onRefresh() {
                        myUpdateOperation();
                    }
                }
        );

        fillTabItem();
        myWebView.setWebViewClient(new WebViewClient());
        myWebView.loadUrl(url[tabLayout.getSelectedTabPosition()]);
    }

    private void fillTabItem() {
        tabItem = new Tab[tabLayout.getTabCount()];
        for(int i=0; i<tabLayout.getTabCount(); i++) {
            tabItem[i] = tabLayout.getTabAt(i);
            tabLayout.getTabAt(i).setIcon(ICONS[i]);
        }
    }

    private void readFeed() throws IOException {
        XmlPullParserFactory parserFactory;
        URL webUrl = new URL(url[1]);
        try {
            parserFactory = XmlPullParserFactory.newInstance();
            XmlPullParser parser = parserFactory.newPullParser();
            InputStream is = webUrl.openStream();
            parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
            parser.setInput(is, null);
            myWebView.loadDataWithBaseURL(null, processParsing(parser), "text/HTML", "UTF-8", null);
        } catch (XmlPullParserException e) {

        } catch (IOException e) {

        }
    }

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

    public void openWebPage(String url) {
        Uri webpage = Uri.parse(url);
        Intent intent = new Intent(Intent.ACTION_VIEW, webpage);
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }

    public void myUpdateOperation() {
        this.myWebView.reload();
        this.mySwipeRefreshLayout.setRefreshing(false);
    }

    private String processParsing(XmlPullParser parser) throws IOException, XmlPullParserException {
        ArrayList<XMLParser.Feed> feeds = new ArrayList<>();
        int eventType = parser.getEventType();
        XMLParser.Feed currentFeed = null;

        while(eventType != XmlPullParser.END_DOCUMENT) {
            String eltName = null;
            switch(eventType) {
                case XmlPullParser.START_TAG: {
                    eltName = parser.getName();
                    if ("item".equals(eltName)) {
                        currentFeed = new XMLParser.Feed();
                    } else if (currentFeed != null) {
                        if("title".equals(eltName)) {
                            currentFeed.setTitle(parser.nextText());
                        /*} else if ("comments".equals(eltName)) {
                            currentFeed.setComments(parser.nextText());
                        } else if ("pubDate".equals(eltName)) {
                            currentFeed.setPubDate(parser.nextText());
                        } else if ("dc:creator".equals(eltName)) {
                            currentFeed.setCreator(parser.nextText());
                        } else if ("description".equals(eltName)) {
                            currentFeed.setDescription(parser.nextText());*/
                        } else if ("content:encoded".equals(eltName)) {
                            String str = parser.nextText().replaceAll("<a href=", "<a href='#' ");
                            //str.replaceAll("https", "http");
                            currentFeed.setContent(str);
                            //currentFeed.setContent(parser.nextText());
                        }
                    }
                    break;
                }
                case XmlPullParser.END_TAG: {
                    eltName = parser.getName();
                    if ("item".equalsIgnoreCase(eltName)) {
                        feeds.add(currentFeed);
                    }
                }
            }
            eventType = parser.next();
        }
        return printFeed(feeds);
    }

    private String printFeed(ArrayList<XMLParser.Feed> feeds) {
        StringBuilder builder = new StringBuilder();
        builder.append("<html>").
                append("<head><style> body {font-size: 150%;} img {display: block; margin: 0 auto;} </style></head>").
                //append("<head><style> img {display: block; margin: 0 auto; width: 50%; height: 30%;} </style></head>").
                append("<body>").
                append("<p>");

        for(XMLParser.Feed feed : feeds) {
            builder.append("<h1>").
                    append(feed.getTitle()).
                    append("</h1><br>").
                    append(feed.getContent()).append("<br>");
            builder.append("<hr size='1'").append("<p style='line-height: 18px;'></p>");
        }
        builder.append("</p>").
                append("</body>").
                append("</html>");

        return builder.toString();
    }

}

Answer 2

这是我的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.matte.parrocchiasanbenedetto">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/fazzolettino"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/fazzolettino"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:configChanges="orientation|screenSize"

            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <intent-filter android:autoVerify="true">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data
                    android:host="photos.app.goo.gl"
                    android:scheme="https" />


            </intent-filter>
        </activity>
    </application>

</manifest>

Answer 3

我认为，正在发生的事情是Google的站点检测到该设备已安装了Google Photos应用，并尝试使用该应用启动了该应用，但Webview不知道如何处理{ {1}}方案。您可以做的是尝试自行启动活动，而不是将URL加载到Webview：

intent://

WebView，链接到Google相册，但ERR_UNKNOWN_URL_SCHEME

3 个答案: