How to get the build/version number of your Android application?

Question

I need to figure out how to get or make a build number for my Android application. I need the build number to display in the UI.

Do I have to do something with

Answer 1

As I had to get only version code and check whether app is updated or not, if yes, I had to launch the playstore to get updated one. I did this way.

public class CheckForUpdate {

public static final String ACTION_APP_VERSION_CHECK="app-version-check";

public static void launchPlayStoreApp(Context context)
{

    final String appPackageName = context.getPackageName(); // getPackageName() from Context or Activity object
    try {
        context.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + appPackageName)));
    } catch (android.content.ActivityNotFoundException anfe) {
        context.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=" + appPackageName)));
    }

}

public static int getRemoteVersionNumber(Context context)
{
    int versionCode=0;
    try {
        PackageInfo pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
        String version = pInfo.versionName;
        versionCode=pInfo.versionCode;
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    return versionCode;
}

}

Then I saved version code using shared preference by creating an util class.

public class PreferenceUtils {

// this is for version code
private  final String APP_VERSION_CODE = "APP_VERSION_CODE";
private  SharedPreferences sharedPreferencesAppVersionCode;
private SharedPreferences.Editor editorAppVersionCode;
private static Context mContext;

public PreferenceUtils(Context context)
{
    this.mContext=context;
    // this is for app versioncode
    sharedPreferencesAppVersionCode=mContext.getSharedPreferences(APP_VERSION_CODE,MODE_PRIVATE);
    editorAppVersionCode=sharedPreferencesAppVersionCode.edit();
}

public void createAppVersionCode(int versionCode) {

    editorAppVersionCode.putInt(APP_VERSION_CODE, versionCode);
    editorAppVersionCode.apply();
}

public int getAppVersionCode()
{
    return sharedPreferencesAppVersionCode.getInt(APP_VERSION_CODE,0); // as default  version code is 0
     }
   }