Android gets the view's wide height in the OnCreate method

The view will have its own width after the drawing is finished, so the width of the view in the OnCreate can be achieved by the following 4 methods:

1, Viewtreeobserver: Monitoring interface Drawing events, in the layout of the call, after use, remember RemoveListener

2, View.post, because the Runnable object will be in the view of the measure, layout after the trigger

3. Overriding the OnLayout method

4, the use of getmeasuredwidth, getmeasuredheight to obtain the measured width and height, may be the view of the true width of the gap

Android gets the view's wide height in the OnCreate method