Seeking to develop the idea of ​​android voice chat

Recently to do a similar micro-channel voice response thing, no ideas, there is no big brother to ideas ah
What technologies need to use it?
There are demo best of

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Landlord, encountered the same problem, you are finished?
Reply:
I also do this thing, I wonder if the landlord does not get out?
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I also want to be a landlord does not know this thing has not done it. . . Best to achieve a group chat. .