Using setCurrentItem() brings no visual effect

[reod]

As in title, besides that everything works perfect. On (FragmentPagerAdapter) myAdapter.getItem() I'm returning custom class which returns simple View in onCreateView().

Plus when I enable debug mode (DEBUG == true) I get: 06-02 09:35:44.470: E/AndroidRuntime(8694): FATAL EXCEPTION: main 06-02 09:35:44.470: E/AndroidRuntime(8694): java.lang.ClassCastException: com.example.mypackage.SubPage cannot be cast to android.view.View 06-02 09:35:44.470: E/AndroidRuntime(8694): at com.example.mypackage.VerticalViewPager.populate(VerticalViewPager.java:938) 06-02 09:35:44.470: E/AndroidRuntime(8694): at com.example.mypackage.VerticalViewPager.populate(VerticalViewPager.java:813) 06-02 09:35:44.470: E/AndroidRuntime(8694): at com.example.mypackage.VerticalViewPager$3.run(VerticalViewPager.java:216) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.view.Choreographer.doFrame(Choreographer.java:531) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.os.Handler.handleCallback(Handler.java:725) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.os.Handler.dispatchMessage(Handler.java:92) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.os.Looper.loop(Looper.java:137) 06-02 09:35:44.470: E/AndroidRuntime(8694): at android.app.ActivityThread.main(ActivityThread.java:5074) 06-02 09:35:44.470: E/AndroidRuntime(8694): at java.lang.reflect.Method.invokeNative(Native Method) 06-02 09:35:44.470: E/AndroidRuntime(8694): at java.lang.reflect.Method.invoke(Method.java:511) 06-02 09:35:44.470: E/AndroidRuntime(8694): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-02 09:35:44.470: E/AndroidRuntime(8694): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-02 09:35:44.470: E/AndroidRuntime(8694): at dalvik.system.NativeStart.main(Native Method)

[castorflex]

what is your SubPage class?

[reod]

It's a Fragment, onCreateView() returns FrameLayout.

[castorflex]

Can you replace the VerticalViewPager with the ViewPager, present in the support library, to see if you still have your exception?

[reod]

Hmm. In this scenario setCurrentItem() doesn't work too and I get the same ClassCastException, from here:

if (DEBUG) {
Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
" view: " + ((View) ii.object));
} 

But during normal swiping by hand, everything is OK. One more information: when I DEBUG is true, after setCurrentItem() i see, that nr of item in

if (DEBUG) {
            Log.i(TAG, "Current page list:");
            for (int i = 0; i < mItems.size(); i++) {
                Log.i(TAG, "#" + i + ": page " + mItems.get(i).position);
            }
        }

is fine. Only visible part won't update.

[castorflex]

Here is the implementation of setCurrentItem:

public void setCurrentItem(int item) {
    mPopulatePending = false;
    setCurrentItemInternal(item, !mFirstLayout, false);
}

The second parameter of setCurrentItemInternal defines if the scroll is animated. We see that it won't be animated until the viewpager is shown (actually, until onLayout is called). This is the wanted behavior.