java.lang.IllegalArgumentException: bad parameter
at org.apache.http.client.utils.URLEncodedUtils.parse(
at org.apache.http.client.utils.URLEncodedUtils.parse(
at android.webkit.AccessibilityInjector.getAxsUrlParameterValue(
at android.webkit.AccessibilityInjector.shouldInjectJavaScript(
at android.webkit.AccessibilityInjector.onPageFinished(
at android.webkit.WebViewClassic.onPageFinished(
at android.webkit.CallbackProxy.handleMessage(
at android.os.Handler.dispatchMessage(
at android.os.Looper.loop(
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(
at dalvik.system.NativeStart.main(Native Method)

相关的google code android project里边的issue中论述如下:

A customer of mine running 4.1.2 just informed me that the issue is still
present! After this issue crashes my app, I have to pop up a dialog
telling them to disable all accessibility services.
Worst user experience ever, but what else can I do.
Fixed in an internal build, to be released in the next major release.
The bug doesn’t occur here in 4.2.1 (Galaxy Nexus, JOP40D).