攝即是空

public static String getAppVersionName(Context context) { 

String versionName = "";
try {
PackageManager pm = context.getPackageManager();
PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
versionName = pi.versionName;
versioncode = pi.versionCode;
if (versionName == null || versionName.length() <= 0) {
return "";
}
} catch (Exception e) {
Log.e("VersionInfo", "Exception", e);
}
return versionName;
}

public static String getVersionName() throws Exception

{
PackageManager packageManager = getPackageManager();
PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),0);
String version = packInfo.versionName;
return version;

}