Recompile with -Xlint in Android studio

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)

6 Answers

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.

You need to add the following inside your app level buld.graddle file

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

If for some reasons you need to continue using a deprecated API you can just suppress the warning. You could annotate the deprecated method with the

@SuppressWarnings("deprecation") 

annotation.

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If you are facing issue in generating signed apk, you can try to do this in your build.gradle(app)

android { lintOptions { checkReleaseBuilds false } } 

It is some error in the project, maybe from XML files. Disabling lintOptions is not a correct solution. Find the error and fix the problem, to do this run below command in Android Studio Terminal

Windows

gradlew assembleDebug --stacktrace

MAC

./gradlew assembleDebug --stacktrace

You can manually run configured lint and other IDE inspections by selecting Analyze > Inspect Code. The results of the inspection appear in the Inspection Results window. see details here:

The message suggests to recompile with -Xlint flag in command-line, to get more issue details, but even if you do, the next log may ask for --stacktrace flag.

In build.gradle file, do something like:

import org.gradle.api.logging.configuration.ShowStacktrace allprojects { // Same as passing --stacktrace option. gradle.startParameter.showStacktrace = ShowStacktrace.ALWAYS tasks.withType(JavaCompile) { options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation" } } 

Note that the import may not be required (just imported to be clear).

Also as y4n9b0 said; Then you can use warnings' details to fix issues.
For example, you can replace deprecated method with new method (I mean, there must be a new-method, since old-method has been deprecated).

But sometimes for backward compatibility, we don't want change our code, and just want to get rid of compile-time warnings; simply add in front of the deprecated method:

@SuppressWarnings("deprecation")