private int getVersionCode() {
    try {
        //獲取packagemanager的例項
PackageManager packageManager = getPackageManager();
//getPackageName()是你當前類的包名，0代表是獲取版本資訊
PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);
Log.e("TAG", "版本號" + packInfo.versionCode);
Log.e("TAG", "版本名" + packInfo.versionName
 
);
        return packInfo.versionCode;
} catch (Exception e) {
        e.printStackTrace();
}

    return 1;
}