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I have some project on Indonesia for company messenger

can you help me for how to change logo n shortcut logo ignite spark? please help and sorry

This is a 10 years old guide, but the only one i know of. It might not work perfectly with the current version of Spark. Build a Branded/Skinned Version of Spark

where i can get the source code?

spark is android application?

The source is on Github https://github.com/igniterealtime/Spark

No, Spark is only a desktop application. You can use any xmpp client with xmpp server. There is a number of mobile clients (Conversations being arguably the best. but it is paid, Xabber also good) https://xmpp.org/software/clients.html

thanks alot its very very helpful