We use the google play and android-support-v7-mediarouterAPI APIs to search for Chromecast, at first we can find the Chromecast, then we do nothing, but the return API is removed after a while, and the Chromecast icon will disappear, we need look for him again.
device: Nexus 7, Android 4.4.4 google play version: 5.0.77-000
test code: https://github.com/googlecast/MediaRouter-Cast-Button-android
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