Android - (Views) Hierarchy Viewer
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GUI: View hierarchy viewer.
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Configuration/Installation
Hierarchy Viewer only works by default with phones running a developer version of the Android OS. If your phone is not a developer phone, you have a few options:
ANDROID_HVPROTO=ddm
You can run Hierarchy Viewer on an emulated phone.
Or you can use use the ViewServer library to get Hierarchy Viewer working on a non-developer, pre Jellybean phone.
Location
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Documentation / Reference