android - Xamarin ZXing QR Code inside tab -

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i integrate zxing qr code scanner app. using fragment tabs. example in tab2, how can add window show scanner view? tried use customoverlay view unfortunately did not work. tried use zxingscannerfragment,but requires android.support.v4.app not ideal other 2 tabs uses android.app namespace. @ right that, when tab 2 selected, jumps straight scanner, , action bar , tabs becomes invisible. can please shed light on this? thank much.

        _fragments = new fragment[]                      {                          new fragment1(),                          new fragment2(),                          new fragment3()                      };                      addtabtoactionbar(resource.string.whatson_tab_label, resource.drawable.ic_action_whats_on);

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