First of all, the local Build-tools version is not used by open source projects, the original Android Studio click Error Prompt will be automatically downloaded, but the kingdom of Google all the links are sealed, so you understand ...
So to csdn downloaded the 21.1.1 version, after decompression, the folder name replaced by the version number 21.1.1, put the following path (depending on the installation path of each individual and different)
After another problem, said the Gradle version is not new enough to find a lap how to upgrade Android Studio under the Gradle method, finally let me find
After a long period of time, the following message appears to indicate that the installation was successful
Then run 9GAG in no error message prompt, the operation effect is as follows
Problems with running open source project 9GAG under Android Studio