系統級應用，重簽名後WebView閃退問題

因爲應用是系統級別的，在AndroidManifest.xml中添加了android:sharedUserId="android.uid.system"

然後在調用WebView時出現閃退：

java.lang.UnsupportedOperationException

For security reasons, WebView is not allowed in privileged processes

java.lang.UnsupportedOperationException:For security reasons, WebView is not allowed in privileged processes
6 android.webkit.WebViewFactory.getProvider(WebViewFactory.java:96)
7 android.webkit.WebView.getFactory(WebView.java:2325)
8 android.webkit.WebView.ensureProviderCreated(WebView.java:2320)
9 android.webkit.WebView.setOverScrollMode(WebView.java:2379)
10 android.view.View.<init>(View.java:3632)
11 android.view.View.<init>(View.java:3736)
12 android.view.ViewGroup.<init>(ViewGroup.java:524)
13 android.widget.AbsoluteLayout.<init>(AbsoluteLayout.java:55)
14 android.webkit.WebView.<init>(WebView.java:580)
15 android.webkit.WebView.<init>(WebView.java:525)
16 android.webkit.WebView.<init>(WebView.java:508)
17 android.webkit.WebView.<init>(WebView.java:495)
18 java.lang.reflect.Constructor.newInstance(Native Method)
19 java.lang.reflect.Constructor.newInstance(Constructor.java:288)
20 android.view.LayoutInflater.createView(LayoutInflater.java:607)
21 com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:55)
22 android.view.LayoutInflater.onCreateView(LayoutInflater.java:682)
23 android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741)
24 android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
25 android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
26 android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
27 android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
28 android.view.LayoutInflater.inflate(LayoutInflater.java:504)
29 android.view.LayoutInflater.inflate(LayoutInflater.java:414)
30 android.view.LayoutInflater.inflate(LayoutInflater.java:365)
31 com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:421)
32 android.app.Activity.setContentView(Activity.java:2175)

 

解決辦法：

在Application的Oncreate裏調用這個方法：

public void hookWebView(){
        int sdkInt = Build.VERSION.SDK_INT;
        try {
            Class<?> factoryClass = Class.forName("android.webkit.WebViewFactory");
            Field field = factoryClass.getDeclaredField("sProviderInstance");
            field.setAccessible(true);
            Object sProviderInstance = field.get(null);
            if (sProviderInstance != null) {
                Log.i("hookWebView","sProviderInstance isn't null");
                return;
            }
            Method getProviderClassMethod;
            if (sdkInt > 22) {
                getProviderClassMethod = factoryClass.getDeclaredMethod("getProviderClass");
            } else if (sdkInt == 22) {
                getProviderClassMethod = factoryClass.getDeclaredMethod("getFactoryClass");
            } else {
                Log.i("hookWebView","Don't need to Hook WebView");
                return;
            }
            getProviderClassMethod.setAccessible(true);
            Class<?> factoryProviderClass = (Class<?>) getProviderClassMethod.invoke(factoryClass);
            Class<?> delegateClass = Class.forName("android.webkit.WebViewDelegate");
            Constructor<?> delegateConstructor = delegateClass.getDeclaredConstructor();
            delegateConstructor.setAccessible(true);
            if(sdkInt < 26){//低於Android O版本
                Constructor<?> providerConstructor = factoryProviderClass.getConstructor(delegateClass);
                if (providerConstructor != null) {
                    providerConstructor.setAccessible(true);
                    sProviderInstance = providerConstructor.newInstance(delegateConstructor.newInstance());
                }
            } else {
                Field chromiumMethodName = factoryClass.getDeclaredField("CHROMIUM_WEBVIEW_FACTORY_METHOD");
                chromiumMethodName.setAccessible(true);
                String chromiumMethodNameStr = (String)chromiumMethodName.get(null);
                if (chromiumMethodNameStr == null) {
                    chromiumMethodNameStr = "create";
                }
                Method staticFactory = factoryProviderClass.getMethod(chromiumMethodNameStr, delegateClass);
                if (staticFactory!=null){
                    sProviderInstance = staticFactory.invoke(null, delegateConstructor.newInstance());
                }
            }

            if (sProviderInstance != null){
                field.set("sProviderInstance", sProviderInstance);
                Log.i("hookWebView","Hook success!");
            } else {
                Log.i("hookWebView","Hook failed!");
            }
        } catch (Throwable e) {
            Log.w("hookWebView",e);
        }
    }