Pressing volume buttons changes system volume.Without getting into the pros and cons of each solution, they both have one thing in common - they are volume based, which raises several problems. Using private API notification, namely AVSystemController_SystemVolumeDidChangeNotification and since iOS 15.0 - SystemVolumeDidChange.Using KVO to observe AVAudioSession property outputVolume.I am trying to use to hardware volume buttons to start/stop transmission.Īll suggested solutions I've seen so far can be narrowed down to two: In the rapidly growing world of messaging, VoIP, and push to talk apps, it’s getting more and more difficult for newcomers to differentiate themselves.I am currently working on a PTT (push-to-talk) app. Fortunately, this has not stopped push to talk app Zello from shoving its way into the spotlight. We’ve had quite a bit of time to play around with and use the Zello application. #ZELLO APP REVIEW FOR ANDROID#Our particular version was version 2.16 for Android devices, which was released on June 12, 2013. Before we get to the review, however, let’s first take a brief look at the app’s already storied history in its brief 15-month lifespan. Zello currently has over 35 million users worldwide. Zello is probably best known for its use as the communications tool of choice for the protesters in Turkey the first week of this month, which pushed the app to the top spot for a week. Zello has also become a very popular social networking app in the Middle East because many organizations use the app’s unique “channels” feature there to dispense info to the public about politics and to organize rallies and protests. Zello is also popular in Brazil and Mexico, where channels have become a popular form of entertainment and communication. To date there are over 200,000 active Zello channels devoted to a variety of topics, with over 2 million users online a day. Zello PTT allows up to 300 users to communicate simultaneously in real-time through these channels. The app supports high-definition voice transmission. Using the app turns any smartphone into a wide-reaching CB radio or walkie-talkie with no bandwidth restrictions.Īs soon as we had downloaded it on our Android device - the app is also available on iPhone, iPad, and iPod touch - and first opened the application, we were presented with a screen like the one shown above. This is the screen where you’ll be able to log in to your existing Zello account or create a new one. Once we logged into our account (far left photo below shows the account being created), we were immediately presented with the “channels” screen (far right photo below), which lists the many different channels, each with a different interests and purposes. For the time being, we ignored the channels and moved over to the middle tab, labeled “Contacts.” Luckily, we already had a few friends who had the application downloaded so we could try it out for ourselves. The third tab is labeled “Recents” and (as it implies) allows you to view your recent conversations. We ignored this tab as well and instead contacted one of our friends via the walkie-talkie feature.Īs mentioned, Zello supports high-definition audio, which sounded crystal clear on our device in most of our tests. There were a few messages received that made our contact sound like they were under water, but it’s hard to tell if that was due to the app itself, or the contact’s device. Otherwise, we really had no complaints with the overall performance. The lag was minimal, and we didn’t experience any delays with our messages. Zello behaves like you would expect a polished PTT app to behave. If you experience any lag or voice problems similar to what we’ve described, please let us know in the comments.
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