在Android上获取应用程序安装日期

PackageManager packageManager = getPackageManager();

try {
    ApplicationInfo applicationInfo = packageManager.getApplicationInfo("com.example.app", 0);
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

long installDate = applicationInfo.firstInstallTime;

Date installDate = new Date(applicationInfo.firstInstallTime);

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String installDateString = dateFormat.format(installDate);