how to check app running in foreground or background in ionic4

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   //Subscribe on pause i.e. background

        this.platform.pause.subscribe(() => {

          //Hello pause

          if(localStorage.getItem("LOG_IN") == "YESORANGE") {

                this.loginprofile=  JSON.parse(localStorage.getItem("Loginprofile"));

                this.api.UserLoginStatus({

                  loginUserId: this.loginprofile.Id,

                  status:"online"

                }).subscribe((res: any) => {

                  console.log(res);

                })

              }

        });


 

        

        //Subscribe on resume i.e. foreground 

        this.platform.resume.subscribe(() => {

          if(localStorage.getItem("LOG_IN") == "YESORANGE") {

                this.loginprofile=  JSON.parse(localStorage.getItem("Loginprofile"));

                this.api.UserLoginStatus({

                  loginUserId: this.loginprofile.Id,

                  status:"offline"

                }).subscribe((res: any) => {

                  console.log(res);

                })

              }

        });

       }

     

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