处理For security reasons, WebView is not allowed in privileged processes崩溃问题
解决Android8.0系统应用打开webView报错
- 解决办法
由于webView存在安全漏洞,谷歌从5.1开始全面禁止系统应用使用webview,使用会导致应用崩溃错误提示:Caused by: java.lang.UnsupportedOperationException: For security reasons, WebView is not allowed in privileged processes异常信息可以看出 是在 WebViewFactory.java 的getProvider 方法 抛出的。源码路径为frameworks/base/core/java/android/webkit/WebViewFactory.java
static WebViewFactoryProvider getProvider() {synchronized (sProviderLock) {// For now the main purpose of this function (and the factory abstraction) is to keep// us honest and minimize usage of WebView internals when binding the proxy.if (sProviderInstance != null) return sProviderInstance; //如果sProviderInstance不为空直接返回//1，判断，如果是系统id ，则抛出异常。final int uid = android.os.Process.myUid();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");}StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactory.getProvider()");try {//2Class<WebViewFactoryProvider> providerClass = getProviderClass();Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "providerClass.newInstance()");try {//3 给 sProviderInstance 赋值sProviderInstance = providerClass.getConstructor(WebViewDelegate.class).newInstance(new WebViewDelegate());if (DEBUG) Log.v(LOGTAG, "Loaded provider: " + sProviderInstance);return sProviderInstance;} catch (Exception e) {Log.e(LOGTAG, "error instantiating provider", e);throw new AndroidRuntimeException(e);} finally {Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);}} finally {Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);StrictMode.setThreadPolicy(oldPolicy);}}}
如果是系统id,就抛出异常!
解决办法
可以通过反射在调用webview 之前，给sProviderInstance 赋值，在Application调用方法,添加这个一个方法：
public static 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(TAG,"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(TAG,"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){//低于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(TAG,"Hook success!");} else {Log.i(TAG,"Hook failed!");}} catch (Throwable e) {Log.w(TAG,e);}}
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