isTapped = false // by default

// Below code is executed
this.isTapped = true;
this.moviesFeedsService.getMovieDetails(asset.asset_id).subscribe
        ((msuMovieDetails) => {
          this.navCtrl.push(
            MediaDetailsPage,
            {
              headerDataTitle: this.headerData.title,
              movieDetails: msuMovieDetails,
              showEpisode: this.featureLayoutData.showEpisodes
            },
            navOptions
          ).then(() => {
            this.isTapped = false; // Reset flag
          });
        });