It should get compiling error, the compileSdkVersion should be 26 or higher about instantappsample HOT 6 CLOSED

can you send a screenshot ?

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You will meet this problem in multiple-feature instant app

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Set the compileSDK to 26, you will not get any compiling error. But when you try to publish on Google Play, you will find an error "ensure that the APKs with version code ? have the android:targetSandboxVersion attribute set to '2' in the AndroidManifest.xml"

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The actual compileSdkVersion is 26 and should stay like this. The attribute targetSandboxVersion is required for Android O, and should be automatically added by Android Studio. But apparently it is not, I think this is a bug from Android Studio. However you can add it manually in the base feature manifest. In the manifest element, just add:
android:targetSandboxVersion="2"

I would recommend creating a new application if you want to release in production (although development mode is OK), this one is already available on the Play Store here and as instant app:

• list of trips
• trip details

I will add soon the major release issues on the readme.

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