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public class APPUtils {
       public static final String TAG = "APPUtils";    public static int getApplicationVersionCode(Context context, String packageName) {
           try {
               List
   
     packageInfos = context.getPackageManager().getInstalledPackages(0);            for (int i = 0; i < packageInfos.size(); i++) {
                   PackageInfo packageInfo = packageInfos.get(i);                //packageInfo.requestedPermissions;                //packageInfo.versionName;               // packageInfo.providers;                //packageInfo.activities;                //packageInfo.permissions;                //packageInfo.packageName;                //packageInfo.versionCode;                //packageInfo.applicationInfo;               // packageInfo.applicationInfo.loadIcon();                //packageInfo.applicationInfo.loadLabel();                //系统应用和第三方应用                //(ApplicationInfo.FLAG_SYSTEM & packageInfo.applicationInfo.flags)                if (packageInfo.packageName.equals(packageName)) {
                       return packageInfo.versionCode;                }            }        } catch (Exception e) {
           }        return 0;    }}
   

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