如何在 Android 上使用 ServiceWorkerController

Question

我遇到了 ServiceWorkerController while looking through the Android WebView documentation and decided to give it a try. Unfortunately I have been unable to get intercept any calls. I am aware of WebViewClient.shouldInterceptRequest 但我有兴趣了解有关 ServiceWorkerController 的更多信息。不幸的是，这些文件有点稀疏，超出了我已经在下面实现的内容。任何帮助，将不胜感激。

我组装了一个简单的应用程序，其中包含一个 Activity。

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();
        }
    }
}

和我相关的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会。我曾相信安装 ServiceWorkerClient 将允许我拦截来自我的应用程序中所有 WebView 的所有请求，而不管域。情况似乎并非如此。 ServiceWorkerClient 仅在如果 webview 已经安装了 ServiceWorker 时才被调用。来自所有 service worker 的所有 service worker 请求然后被汇集到 ServiceWorkerClient。这意味着如果您希望拦截应用中所有网络视图中的所有网络请求，您还需要在 WebViewClient 上覆盖 shouldInterceptRequest()。

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();
        }
    }
}

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