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I updated from Android Studio 2.3 to 3.0 and now none of the previews on the XML editors are shown.
I can see a null in the top bar in the API level selector and it does not give me any option to pick
Any possible solution for that?
I tried Invalidate cache and restart but it does not seem to help.
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Tap the "Software Information" option on the About Phone menu. The first entry on the page that loads will be your current Android software version.
Android SDK Build-Tools is a component of the Android SDK required for building Android apps. It's installed in the <sdk>/build-tools/ directory.
This example demonstrates how do I retrieve android API version programmatically. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.
Just press "Sync Project with gradle" and enjoy :) Sync icon is present in the toolbar 
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I resolve this isuue by Syncing Project with gradle files.
In android studio from top toolbar.
choose first File option and click option Sync Project with gradle files.
thanks.
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