Enforce newapi check only if min_sdk_version < compile_sdk_version

- NewApi check should be enforced only if min_sdk_version is less than
  the compile_sdk_version (the opposite direction should be a different
  build-time error)
- Change the datatype of *sdkVersion to android.ApiLevel (from string)
  to support version comparisons

Test: go build ./java
Test: no changes in ninja file
Bug: 228956345

Change-Id: Ic408857db7760d912ef4694d2ed72c0b7106eb04

java/lint.go

@@ -75,9 +75,9 @@ type linter struct {
 	extraLintCheckJars      android.Paths
 	test                    bool
 	library                 bool
-	minSdkVersion           string
-	targetSdkVersion        string
-	compileSdkVersion       string
+	minSdkVersion           android.ApiLevel
+	targetSdkVersion        android.ApiLevel
+	compileSdkVersion       android.ApiLevel
 	compileSdkKind          android.SdkKind
 	javaLanguageLevel       string
 	kotlinLanguageLevel     string
@@ -300,7 +300,7 @@ func (l *linter) generateManifest(ctx android.ModuleContext, rule *android.RuleB
 		Text(`echo "<manifest xmlns:android='http://schemas.android.com/apk/res/android'" &&`).
 		Text(`echo "    android:versionCode='1' android:versionName='1' >" &&`).
 		Textf(`echo "  <uses-sdk android:minSdkVersion='%s' android:targetSdkVersion='%s'/>" &&`,
-			l.minSdkVersion, l.targetSdkVersion).
+			l.minSdkVersion.String(), l.targetSdkVersion.String()).
 		Text(`echo "</manifest>"`).
 		Text(") >").Output(manifestPath)
 
@@ -325,7 +325,7 @@ func (l *linter) lint(ctx android.ModuleContext) {
 		return
 	}
 
-	if l.minSdkVersion != l.compileSdkVersion {
+	if l.minSdkVersion.CompareTo(l.compileSdkVersion) == -1 {
 		l.extraMainlineLintErrors = append(l.extraMainlineLintErrors, updatabilityChecks...)
 		_, filtered := android.FilterList(l.properties.Lint.Warning_checks, updatabilityChecks)
 		if len(filtered) != 0 {
@@ -427,7 +427,7 @@ func (l *linter) lint(ctx android.ModuleContext) {
 		FlagWithOutput("--html ", html).
 		FlagWithOutput("--text ", text).
 		FlagWithOutput("--xml ", xml).
-		FlagWithArg("--compile-sdk-version ", l.compileSdkVersion).
+		FlagWithArg("--compile-sdk-version ", l.compileSdkVersion.String()).
 		FlagWithArg("--java-language-level ", l.javaLanguageLevel).
 		FlagWithArg("--kotlin-language-level ", l.kotlinLanguageLevel).
 		FlagWithArg("--url ", fmt.Sprintf(".=.,%s=out", android.PathForOutput(ctx).String())).