问题
I would like to resize large images for connected Android Wear device. I don't want to transmit large images over Bluetooth. Is there some generic way? I don't want to hardcode screen size for a specific device.
回答1:
If you want such kind of optimizations you can ask particular device for a configuration (resolution etc.)
For the communication you can use one of WearableApi:
https://developer.android.com/training/wearables/data-layer/index.html
Either DataApi or MessageApi.
But I think you should use MessageApi in that case.
You will need to send a configuration from Watch to your Phone and then store it on Phone. From my test I can tell that nodeId appears to be constant [confirmation needed] - even after reboots. Your Phone will need to ask for the configuration only once and store this configuration (associated to sender's nodeId) for later use.
Then if you're about to send a bitmap to a connected Node, you need just to read it's configuration (stored locally) and resize that bitmap to appropriate size:)
回答2:
The documentation states, that the background images should be 640x400px if you want parallax effect or 400x400px if you don't want it.
来源：https://stackoverflow.com/questions/24957196/how-to-get-dimensions-of-a-connected-android-wear-device-for-making-bitmaps-smal