Recompile with -Xlint in Android studio

Question

When I build my Android project in Android Studio, I get message:

Note: Some input files use unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 

and

Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint:deprecation for details. 

I would like to do what the message suggested, but how? How can I configure my Android studio to re-compile my project with -Xlint as the above message suggested? (I am using Android Studio 3.0.1)

Answer 1

The message suggest you recompile with args -Xlint to get more warning details, add these code to build.gradle:

allprojects {     tasks.withType(JavaCompile) {         options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"     } } 

Then you can fix warnings by detailed messages.
For example, you can replace deprecated method with new method(there always been a new method since old method has been deprecated) .

However, sometimes we don't want change our code for some reasons, we just want get rid of compile warning, you can add @SuppressWarnings("deprecation") in front of the deprecated method.