在 Android 工作室中使用-Xlint 重新编译

当我在 Android Studio 中构建我的 Android 项目时，我得到的信息是:

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

还有

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

我愿意按照留言中的建议去做，但是怎么做呢？我如何配置我的 Android 工作室重新编译我的项目与 -Xlint作为上述信息建议？(我使用的是 Android Studio 3.0.1)

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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.

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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
}
}
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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

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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.

post link

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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

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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")

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