Getwidth() And Getheight() Always Returning 0. Custom View
Solution 1:
You must wait until after the first measure and layout in order to get nonzero values for getWidth()
and getHeight()
. You can do this with a ViewTreeObserver.OnGlobalLayouListener
public void onViewCreated(final View view, Bundle saved) {
super.onViewCreated(view, saved);
view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
} else {
view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
// get width and height of the view
}
});
}
Solution 2:
My preferred method is to add an OnLayoutChangeListener
to the view that you want to track itself
CustomViewcustomView= ...
customView.addOnLayoutChangeListener(newView.OnLayoutChangeListener() {
@OverridepublicvoidonLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
// Make changes
}
});
You can remove the listener in the callback if you only want the initial layout.
Solution 3:
Using ViewTreeObserver.OnGlobalLayoutListener
, View.post(Runnable action)
or onWindowFocusChanged()
isn't the best solution. This article (note: I am the author of this article) explains why and provides a working solution using doOnLayout
kotlin extension, which is based on View.OnLayoutChangeListener
. If you want it in Java, in the article there's a link to doOnLayout
source code, it's very simple and you can do something similar in Java too.
Solution 4:
You have to wait until the onSizeChanged() method is called before you can reliably determine the View size.
This is called during layout when the size of this view has changed. If you were just added to the view hierarchy, you're called with the old values of 0.
Solution 5:
Try calling
culoide.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
first, then try getWidth()
and getHeight()
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