current app version check in android

1String versionName = context.getPackageManager()
2    .getPackageInfo(context.getPackageName(), 0).versionName;

1PackageManager manager = this.getPackageManager();
2PackageInfo info = manager.getPackageInfo(this.getPackageName(), PackageManager.GET_ACTIVITIES);
3Toast.makeText(this,
4     "PackageName = " + info.packageName + "\nVersionCode = "
5       + info.versionCode + "\nVersionName = "
6       + info.versionName + "\nPermissions = " + info.permissions, Toast.LENGTH_SHORT).show();

1private String getCurrentVersion(){
2PackageManager pm = this.getPackageManager();
3PackageInfo pInfo = null;
4
5        try {
6            pInfo =  pm.getPackageInfo(this.getPackageName(),0);
7
8        } catch (PackageManager.NameNotFoundException e1) {
9            e1.printStackTrace();
10        }
11        String currentVersion = pInfo.versionName;
12
13        return currentVersion;
14    }