如何在Android上使用ServiceWorkerController

Question

我在查看 Android WebView 文档时遇到了ServiceWorkerController，并决定尝试一下。不幸的是我无法拦截任何电话。我知道WebViewClient.shouldInterceptRequest但有兴趣了解有关 ServiceWorkerController 的更多信息。不幸的是，这些文档比我下面已经实现的内容有点稀疏。任何帮助，将不胜感激。

我已经组装了一个由单个 Activity 组成的简单应用程序。

package com.example.myapplication;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.ServiceWorkerClient;
import android.webkit.ServiceWorkerController;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {
    private final static String LOGTAG = MainActivity.class.getSimpleName();

    private WebView mWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ServiceWorkerController.getInstance().setServiceWorkerClient(new ServiceWorkerClient() {
            @Override
            public WebResourceResponse shouldInterceptRequest(WebResourceRequest request) {
                Log.e(LOGTAG, "in service worker");
                return null;
            }
        });

        setContentView(R.layout.activity_main);

        mWebView = (WebView) findViewById(R.id.activity_main_webview);

        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);


        mWebView.setWebViewClient(new WebViewClient());
        Log.e(LOGTAG, "about to load URL");
        mWebView.loadUrl("https://www.google.com");
    }

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

以及我的相关build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 24
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}

Answer 1

我发现这个问题是一个误解。我曾相信安装 aServiceWorkerClient将允许我拦截来自应用程序中所有 WebView 的所有请求，无论域如何。事实似乎并非如此。仅当Web 视图已安装 ServiceWorker 时才会ServiceWorkerClient调用。然后，来自所有 Service Worker 的所有 Service Worker 请求都会被集中到 . 这意味着，如果您希望拦截应用程序中所有 Web 视图中的所有网络请求，您还需要覆盖您的。ServiceWorkerClientshouldInterceptRequest()WebViewClient

package com.example.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.ServiceWorkerClient;
import android.webkit.ServiceWorkerController;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import androidx.annotation.Nullable;


public class MainActivity extends Activity {
    private final static String LOGTAG = MainActivity.class.getSimpleName();

    private WebView mWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ServiceWorkerController swController = ServiceWorkerController.getInstance();
        swController.setServiceWorkerClient(new ServiceWorkerClient() {
            @Override
            public WebResourceResponse shouldInterceptRequest(WebResourceRequest request) {
                Log.e(LOGTAG, "in service worker. isMainFrame:"+request.isForMainFrame() +": " + request.getUrl());
                return null;
            }
        });
        swController.getServiceWorkerWebSettings().setAllowContentAccess(true);

        setContentView(R.layout.activity_main);

        mWebView = (WebView) findViewById(R.id.activity_main_webview);

        WebSettings webSettings = mWebView.getSettings();
        WebView.setWebContentsDebuggingEnabled(true);
        webSettings.setJavaScriptEnabled(true);


        mWebView.setWebViewClient(new WebViewClient() {
            @Nullable
            @Override
            public WebResourceResponse shouldInterceptRequest(WebView view,
                                                              WebResourceRequest request) {
                Log.e(LOGTAG, "in webview client. isMainFrame:"+request.isForMainFrame() +": " + request.getUrl());
                return super.shouldInterceptRequest(view, request);
            }
        });
        Log.e(LOGTAG, "about to load URL");

        //service worker handler only invoked on pages with service workers
        mWebView.loadUrl("https://developers.google.com/web/fundamentals/primers/service-workers/");

    }

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