Recompile with -Xlint in Android studio
AndroidAndroid StudioGradleAndroid Problem Overview
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)
Android Solutions
Solution 1 - Android
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.
Solution 2 - Android
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.
Solution 3 - Android
If you are facing issue in generating signed apk, you can try to do this in your build.gradle(app)
android {
lintOptions {
checkReleaseBuilds false
}
}
Solution 4 - Android
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
Solution 5 - Android
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: https://developer.android.com/studio/write/lint#manuallyRunInspections
Solution 6 - Android
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")