ionic2/3注册安卓返回

如果使用了

this.app.getRootNav().push()以及this.navCtrl.push();

 

则在注册安卓返回键的时候

  registerBackButtonAction() {

        if (!this.nativeService.isAndroid()) {

         return;

        }

        this.platform.registerBackButtonAction(() => {

         if (this.keyboard.isOpen()) {//如果键盘开启则隐藏键盘

            this.keyboard.close();

            return;

         }

         //点击返回按钮隐藏toast或loading或Overlay

         this.ionicApp._toastPortal.getActive() ||this.ionicApp._loadingPortal.getActive()|| this.ionicApp._overlayPortal.getActive();

         //隐藏modal

         let activePortal = this.ionicApp._modalPortal.getActive();

         if (activePortal) {

            activePortal.dismiss();

            return;

         }

         //页面返回

         if(this.app.getRootNav().canGoBack()){

             //this.showExit() this.nativeService.minimize()

                return this.app.goBack()

         }else{

                return this.showExit();

                

         }

        }, 10);

    }

//双击退出提示框

    showExit() {

        if (this.backButtonPressed) { //当触发标志为true时，即2秒内双击返回按键则退出APP

            this.platform.exitApp();

        } else {

            this.nativeService.showToast('再按一次退出应用');

            this.backButtonPressed = true;

            setTimeout(() => { //2秒内没有再次点击返回则将触发标志标记为false

                this.backButtonPressed = false;

            }, 2000)

        }

    }