Is Android SDK mandatory for Flutter?

It is not neccessary, but advised to install Android Studio for Flutter . It makes it very easy to install and configure all the settings etc. What you definitely need is the Android SDK and JDK. You can definitely install and run flutter without Android Studio (you can also use Visual Studio).

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Is Gradle build necessary?

Gradle is one type of build tool that builds the source code of the program. So it’s an important part of Android Studio, and needs to be installed before starting developing your application . We do not have to install it separately, because the Android Studio does it for us, when we make our first project.

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