Implementation method for obtaining the height or width of the control in oncreate in Android
The onCreate function only provides an opportunity to initialize data, and the graph has not been officially drawn at this time. When the graphics have not been rendered, getWidth() or getHeight() gets the value 0. If you need an adaptive screen, you need to get the parent control size as soon as you enter the interface, and then you need to dynamically set the child control size in onCreate.
Method 1:
Use the addOnPreDrawListener interface of the ViewTreeObserver class.
ViewTreeObserver vto = ();
(() {
@Override
publicboolean onPreDraw() {
if(hasMeasured == false){
intwid = ();
inthei = ();
if(wid != 0 && hei != 0){
hasMeasured= true;
}
}
returntrue;
}
});
Method 2:
Use the addOnGlobalLayoutListener interface of the ViewTreeObserver class.
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