nativescript preview not working on android app - nativescript

I use nativescript preview app in Android.When I scan QR code, the preview app always show Components, not the home page.I can not find any error from device.How to solve this problem?

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Nativescript preview button shows QR code only

how can i get this preview window. Earlier I got it very first time only. now when i click "Preview" button it shows QR code for mobilepreview window
Just to make sure: What happens when you click on QR code button shown in the print screen?
Install the companion apps NativeScript Playground and NativeScript Preview on a device with iOS or Android and scan that QR code (using NativeScript Playground)
You'll see on your device a preview of the app from the playground.
Check this page Step 3: Install the NativeScript Playground app with direct links to the apps and more details about this workflow.

NativeScript Playground QR code leads to default app

I am using NativeScript Playground 5 with iOS 12.1
When I attempt to scan a QR code on Playground, the Preview application loads, but the project specified by the QR code does not load.
It was working a few scans ago, then suddenly this behavior crops up.
Things I have tried:
Re-installing the Playground and Preview App
Getting other phones to try the same QR code -- theirs work
Using my phone on other Playground projects -- doesn't work
Restarting my phone
Making sure that there's Internet access.

JavaFx Android Application would not display correctly

My Javafx app does not display anything, it displays a blank screen on the android device. What can i do? Thank you I have created the android apk, and also Installed it on an android device, but it still does not display anything. What have i not done?

xamarin studio - android emulator not launching application

I am trying to launch a simple application with some labels and images on the content page, but when the android emulator starts it opens the application and shows only a white page with nothing on it. However, if I run the iOS simulator it shows the label and images. So I wonder if there is something that is preventing the page from loading? I am using Xamarin Forms in Studio on Mac.
Can you try it in a fisical device ?
Just to know if your emulator has an error...
Are you sure you have an StackLayout or another container for the label and entry ?
Hope you solve it...

admob ads are not displying (blank screen) in wp7

I'm working on AdMob to display the ads in my app using https://developers.google.com/mobile-ads-sdk/docs/admob/fundamentals and tried this video tutorial also
am not getting any errors but it not dispalying any ads(showing blank screen) and i have tested both emulator, device getting same result
how to display the adds in my app using AdMob
downloaded latest Sdk form this
Thanks in advance

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