Multiscreen Development
Because the pixel density of screens varies considerably from device to device, the pixel is not a useful unit of measurement for specifying the layout of apps. Instead, the appropriate unit of measurement is the "point" (pt) for IOS and "device independent pixel" (dp) for Android.
Unless otherwise stated measurements used in this guide are in points.
1 pt is approximately 1.1 dp
Gestures
Gestures such as pinching, swiping and shaking are key features of mobile devices. If used wisely, they can significantly improve the user experience. You can support any gestures that are standard on the target platforms. If your app has specific gestures, then you must include explanations and hints on how to use them.
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