在HScrollview中获取错误

Question

java.lang.NullPointerException
at com.clarusapps.SwamiVivekananda.HScrollview.onTouchEvent(HScrollview.java:147)
at android.view.View.dispatchTouchEvent(View.java:5568)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2064)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1732)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2070)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1746)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2070)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1746)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2070)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1746)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2070)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1746)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2070)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1746)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1961)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1398)
at android.app.Activity.dispatchTouchEvent(Activity.java:2428)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1909)
at android.view.View.dispatchPointerEvent(View.java:5748)
at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3141)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2695)
at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:935)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2709)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:4974)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)

Answer 1

尝试以下，最后一次对我有用：

your_horizo​​ntal_scroll_view_object

final int availableToScroll = your_hsv_object.getChildAt(
    your_hsv_object.getChildCount() - 1).getRight() - scrollX - getWidth();