1.sw600 resources are referenced when the screen width exceeds 600dp in width, w800 resources are referenced when the screen width is exactly 800dp.
2.sw600 resources are referenced when software rendering is enabled, w800 resources are referenced when WiFi is enabled.
3.sw600 resources are referenced when the versionCode is 600 and the device is of small form factor, w800 resources are referenced when the versionCode is 800 and the device is of wide form factor.
4.sw600 resources are referenced when the screen width is smaller than 600dp in width, w800 resources are referenced when the screen width is greater than 800dp.