How to learn which version of application installed programmatically in android

Question

Is it possible to learn which version of an application (such as facebook/twitter) installed on the device programmatically in android ?

Thanks...

Answer 1

Yes, like this:

String packageToCheck = "com.facebook";          

List<PackageInfo> packages = getPackageManager().getInstalledPackages(0);
for (int i=0; i<packages.size(); i++) {
    PackageInfo p = packages.get(i);
    if (p.packageName.contains(packageToCheck)) {
        String name = p.applicationInfo.loadLabel(getPackageManager()).toString();
        String pname = p.applicationInfo.loadLabel(getPackageManager()).toString();
        String packageName = p.packageName;
        String versionName = p.versionName;
        int versionCode = p.versionCode;
        Log.i(TAG, name + ": " + pname + ": " + packageName + ": " + versionName + ": " + versionCode);
    }
}