问题
I am using Android SDK Manager revision 23.0.5. I tried to update some SDK, but got this errors. I tried a lot of times. And I try to use "https://" in the option but failed. I have this trouble all day. How can I fix it?
回答1:
Clearing the SDK Manager cache: [Tools > Options > Clear] Cache and the reloading [Package > Reload] helps.
Also in some cases disabling the real time protection of your anti virus or the whole anti virus may solve the problem.
Finally a guess may be that forcing to use http for downloading repos may solve some problems [Tools > Options > Force https sources to be downloaded using http].
回答2:
go to tools ---> Options ---> Clear Cache. Then Packages ---> Reload
回答3:
Sorry for this question, finally I find it's the network problem between Google and me. China has blocked Google. After I had used VPN, everything is OK. Thank you all for your help.
So I suggest you to check the connection between you and Google. Make sure everything is OK. Then you still have the error, you can try @Alireza Kazemi and @Hirak Chhatbar's solution.
回答4:
To facilitate finding the clear cache on SDK Manager:
For SDK Manager 25.2.5 on Mac, select SDK Manager -> Preferences or press Command + ,
And there is the button to Clear Cache
However, I still cannot resolve my checksum error.
UPDATE:
The comment by @ded to this answer posts the link to the solution which worked for me.
来源：https://stackoverflow.com/questions/26499617/android-sdk-manager-download-finished-with-wrong-checksum