Excuse me, how do I start app Android development in i.mx6Q? Is there a reference document?

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please forward it to TICS weidong.sun

[jimmychan]

One more link useful for you. You can download BSP and documents from here:

i.MX 6 Series Software and Development Tool|NXP

[SergioSolis]

There is a lot of documentation available online to start developing apps on Android.

You need Android Studio:

Android Studio Overview | Android Developers

And an Android Tutorial can be found here:

Getting Started | Android Developers