我尝试在设备的设置应用中选择子集，我看到了这个例外。这是否意味着设置是一个特权流程，无法访问webview？
我尝试从设置中选择HDMI选项，这是异常堆栈：
03-23 08:45:03.301 E/AndroidRuntime( 3299): Caused by: java.lang.UnsupportedOperationException: For security reasons, WebView is not allowed in privileged processes
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebViewFactory.getProvider(WebViewFactory.java:96)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.getFactory(WebView.java:2194)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.ensureProviderCreated(WebView.java:2189)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.setOverScrollMode(WebView.java:2248)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.view.View.<init>(View.java:3588)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.view.View.<init>(View.java:3682)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.view.ViewGroup.<init>(ViewGroup.java:497)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.widget.AbsoluteLayout.<init>(AbsoluteLayout.java:55)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.<init>(WebView.java:544)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.<init>(WebView.java:489)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.<init>(WebView.java:472)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.<init>(WebView.java:459)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.webkit.WebView.<init>(WebView.java:449)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at com.android.settings.HDMI3DPlaySettings.onCreate(HDMI3DPlaySettings.java:123)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.Fragment.performCreate(Fragment.java:2031)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:863)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.BackStackRecord.run(BackStackRecord.java:834)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1452)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:483)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at com.android.settings.SettingsActivity.switchToFragment(SettingsActivity.java:1002)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at com.android.settings.SettingsActivity.onCreate(SettingsActivity.java:599)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.Activity.performCreate(Activity.java:5990)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
03-23 08:45:03.301 E/AndroidRuntime( 3299): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2320)
答案 0 :(得分：3)
我遇到了同样的情况; 在manifest中添加了[android：sharedUserId =＆＃34; android.uid.system＆＃34;]，并在APP中使用了webview; 它在android 5.0.2项目中没问题，但在5.1项目中失败了......
答案 1 :(得分：2)
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.debug("sProviderInstance isn't null");
return;
}
Method getProviderClassMethod;
if (sdkInt > 22) { // above 22
getProviderClassMethod = factoryClass.getDeclaredMethod("getProviderClass");
} else if (sdkInt == 22) { // method name is a little different
getProviderClassMethod = factoryClass.getDeclaredMethod("getFactoryClass");
} else { // no security check below 22
log.info("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());
log.debug("sProviderInstance:{}", sProviderInstance);
field.set("sProviderInstance", sProviderInstance);
}
log.debug("Hook done!");
} catch (Throwable e) {
log.error(e);
}
}
在创建WebView之前运行此方法。
Android在创建WebViewFactory字段sProviderInstance期间（当它为空时）执行此类安全检查，sProviderInstance是静态字段。因此，我们可以在安全检查之前使用反射创建sProviderInstance的实例。
请参阅下面的android 5.1源代码。
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;
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");
}
...
答案 2 :(得分：0)
此异常由WebViewFactory生成，下面是代码：
final int uid = android.os.Process.myUid();
if (uid == android.os.Process.ROOT_UID || uid == android.os.Process.SYSTEM_UID
|| uid == android.os.Process.PHONE_UID || uid == android.os.Process.NFC_UID
|| uid == android.os.Process.BLUETOOTH_UID) {
throw new UnsupportedOperationException(
"For security reasons, WebView is not allowed in privileged processes");
}
因此，如果您尝试使用提及的UID使用情况的网络视图，该应用程序将崩溃。
我还需要使用webView在我的应用中显示html，但找不到一些标准的解决方案。