API Level 9 이전 버전
[code lang="java"]
PackageManager pm = context.getPackageManager();
ApplicationInfo appInfo = pm.getApplicationInfo("app.package.name", 0);
String appFile = appInfo.sourceDir;
long installed = new File(appFile).lastModified();
[/code]
API Level 9 이상
[code lang="java"]
long installed = context.getPackageManager().getPackageInfo("package.name", 0).firstInstallTime;
[/code]