Eclipse reports an error after the Android project is imported

The following error is reported:

Android requires compiler compliance level 5.0 or 6.0. Found '1. 7' instead. Please use Android Tools
If you encounter the above problems, it does not matter, it is easy to solve. In fact, the compilation environment used by the project is incorrect. Because jdk has 1.5, 1.6, 1.7, and so on, it requires 5 or 6, but you have given it 7, so the compiler will complain.

Two options:

Right-click your Project and choose "Android Tools-> Fix Project Properties". If this does not exist, check the second one.
Right-click your project, select "Properties", and select "Java Compiler" in the dialog box to check the "Enable project specific settings" option, select 1.5 or 1.6 from "Compiler compliance settings.
OK.