Checking the version of application which I am currently using in my app.

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Checking the version is because we have to make the users to update the application so that there is no error when we change the scripts from the server.
Use:
try {
    PackageInfo pInfo = this.getPackageManager().getPackageInfo(getPackageName(), 0);
    String version = pInfo.versionName;
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}
And you can get the version code by using this
int verCode = pInfo.versionCode;


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