When I run
~$ unzip android-sdk_r24.0.2-linux.tgz
I get the error message
unzip: cannot find or open android-sdk_r24.0.2-linux.tgz,
android-sdk_r24.0.2-linux.tgz.zip or android-sdk_r24.0.2-linux.tgz.ZIP.
Why is this and what can I do to solve this problem?