[android-developers] nullPointerException in android.webkit.WebView.onTouchEvent

[HeHe]

I override dispatchTouchEvent() like this:

        public boolean dispatchTouchEvent(MotionEvent ev)
        {
                WebView v=findViewById(R.id.detail);
                return v.dispatchTouchEvent(ev);
        }

I am getting intermittent NullPointerException like this:

07-03 18:03:54.530: ERROR/AndroidRuntime(1681):
java.lang.NullPointerException
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.webkit.WebView.onTouchEvent(WebView.java:3566)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.view.View.dispatchTouchEvent(View.java:3368)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:831)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
com.wth.xxxView.dispatchTouchEvent(xxxView.java:118)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
com.android.internal.policy.impl.PhoneWindow
$DecorView.dispatchTouchEvent(PhoneWindow.java:1691)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.view.ViewRoot.handleMessage(ViewRoot.java:1525)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.os.Handler.dispatchMessage(Handler.java:99)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.os.Looper.loop(Looper.java:123)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
android.app.ActivityThread.main(ActivityThread.java:3948)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
java.lang.reflect.Method.invokeNative(Native Method)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
java.lang.reflect.Method.invoke(Method.java:521)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
(ZygoteInit.java:782)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
07-03 18:03:54.530: ERROR/AndroidRuntime(1681):     at
dalvik.system.NativeStart.main(Native Method)

I verify that the variable v is never null. How come there can be
nullpointer exception happening in
android.webkit.WebView.onTouchEvent????
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