Should I install all Android SDK tools?

No, You don’t need to install everything . Install the “SDK Platform” for the Android versions you’ve set as minimum, target, and in-between the minimum & target. The Android SDK Extras are usually not required; but it is useful to be aware of them since they may be required depending on your use case.6 Mar 2015

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Why is my AVD Manager not working?

SDK Build Tools are not installed If it fails then you may have to install it again. You look at the build tab at the bottom of the screen, it will display the error message and option to install the Build tools. Install it and you should be able to see the AVD Manager. Another way is to go to the SDK Manager.

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