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So I am trying to develop an idea that has two core apps - The user The "alerter"

Basically, the alerter sends out a message that is received by all the phones with the app made for the users, but within a specific radius and not all. Any old programs I can look up into? or any tips, ideas? I'm literally new to the android coding world.

Your help is highly appreciated. Thanks :)

user3886449
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2 Answers2

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There are numerous ways that could be done, including:

  • Bluetooth detection
    • this is not feasible until Android supports becoming a Bluetooth Low Energy transmitter
  • WiFi detection
    • the devices must be on same access point to have network connectivity with each other
  • Server-side
    • All devices update a common server with their location
    • Devices can then query server for (reported) nearby devices
    • Server can also push new devices using GCM or Push IO

You could maybe start by looking for apps that do this sort of thing already. One is the instant-messaging app WeChat, and there are also some dating apps that allow users to make contact with nearby potentials.

Also read Find nearby users of an app (iPhone and Android)

Community
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I think you should start with Google Cloud Messaging:

Google Cloud Messaging for Android (GCM) is a service that allows you to send data from your server to your users' Android-powered device, and also to receive messages from devices on the same connection. The GCM service handles all aspects of queueing of messages and delivery to the target Android application running on the target device. GCM is completely free no matter how big your messaging needs are, and there are no quotas.

EvZ
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