Get your application informations

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PackageManager manager = this.getPackageManager();
try {
   PackageInfo info = manager.getPackageInfo(this.getPackageName(), 0);
   String packageName = info.packageName;
   int versionCode = info.versionCode;
   String versionName = info.versionName;
   } catch (NameNotFoundException e) {
   // TODO Auto-generated catch block
   }