系统应用webview报错

1.Hook思想

应用在Application中初始化hookWebView

/**

* Hook思想,解决root和system应用第一次无法使用webview

* 报错：java.lang.UnsupportedOperationException: For security reasons, WebView is not allowed in privileged processes

*/

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) {

LogUtils.d("sProviderInstance isn't null");

return;

        }

Method getProviderClassMethod;

        if (sdkInt >22) {

getProviderClassMethod = factoryClass.getDeclaredMethod("getProviderClass");

        }else if (sdkInt ==22) {

getProviderClassMethod = factoryClass.getDeclaredMethod("getFactoryClass");

        }else {

LogUtils.d("Don't need to Hook WebView");

return;

        }

getProviderClassMethod.setAccessible(true);

        Class providerClass = (Class) getProviderClassMethod.invoke(factoryClass);

        Class delegateClass = Class.forName("android.webkit.WebViewDelegate");

        Constructor providerConstructor = providerClass.getConstructor(delegateClass);

        if (providerConstructor !=null) {

providerConstructor.setAccessible(true);

            Constructor declaredConstructor = delegateClass.getDeclaredConstructor();

            declaredConstructor.setAccessible(true);

            sProviderInstance = providerConstructor.newInstance(declaredConstructor.newInstance());

            LogUtils.d("sProviderInstance:{}", sProviderInstance);

            field.set("sProviderInstance", sProviderInstance);

        }

LogUtils.d("Hook done!");

    }catch (Throwable e) {

}

}

2.修改framework

framewor/base/core/java/android/webkit/WebViewFactory.java

@@ -148,10 +148,10 @@ public final class WebViewFactory {

            if (sProviderInstance != null) return sProviderInstance;

            final int uid = android.os.Process.myUid();

-            if (uid == android.os.Process.ROOT_UID || uid == android.os.Process.SYSTEM_UID) {

+            /*if (uid == android.os.Process.ROOT_UID || uid == android.os.Process.SYSTEM_UID) {

                throw new UnsupportedOperationException(

                        "For security reasons, WebView is not allowed in privileged processes");

-            }

+            }*/

            Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getProvider()");

这种方式会导致系统不安全，不推荐；最好根据自己应用的包名加以判断