Android requires compiler compliance level 5.0 or 6.0. Found '1. 7' instead. Please use

Problem description: Android requires compiler compliance level 5.0 or 6.0. Found '1. 7' instead. Please use Android tool.

 

Because the previous versions of Eclipse, Adt, SDK, JDK were too low, they were downloaded from the official website two days ago.

After successful configuration, an error occurred while adding the original project!
Android requires compiler compliance level 5.0 or 6.0. Found '1. 7' instead. Please use Android tools> fix project properties.
Solution:

1. Right-click the project and choose Android tools> fix project.

2. If not, check project-> properties-> Java compiler

Make sure that JDK compliance is set to 1.6 (the higher the version, the better) and enable specific seetings.

After these two steps, the problem is basically solved.