android擷取程式安裝時間

雖然google有在PackageInfo裡提供firstInstallTime這個介面（其實是一個public欄位），但似乎無用，傳回值為零。google了下 真正可以擷取安裝時間要變通下

PackageManager pm = context.getPackageManager();ApplicationInfo appInfo = pm.getApplicationInfo("app.package.name", 0);String appFile = appInfo.sourceDir;long installed = new File(appFile).lastModified(); //Epoch Time

http://stackoverflow.com/questions/2831333/how-to-get-app-install-time-from-android