java - Facebook Messenger like Activity? -

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i trying make app similar facebook messenger has chat heads. done chat heads part, , want display window when user taps on chat head messenger. (look here: http://cdn1.tnwcdn.com/wp-content/blogs.dir/1/files/2013/04/fbscreens2.jpg not own of images)

can tell me how done - activity (because can't see in task manager), or dialog fragment? how can make similar occupies less space screen size. also, soft keyboard pushes current white box , goes outside screen space.

what call it? i'm new android, please can me. thanks.

that feature called floating windows. this article has great explanations. , this one more beginners, step-by-step instructions.

here libraries, might have need:


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