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Some Red Cross organizations have developed their own first-aid app for the country they serve, so you might be able to look for that.
Edit: here is a more generic first aid app I have installed, which goes into a lot more detailed than most Red Cross apps (This one doesn't have an emergency section, which you can go to to receive instructions as you go on, if you were to treat something, unlike most Red Cross apps, however): https://play.google.com/store/apps/details?id=com.esteps.firstaid&rdid=com.esteps.firstaid