ViewTreeObserver

1. Android初级教程_获取Android控件的宽和高
   
2. http://blog.youkuaiyun.com/johnny901114/article/details/7839512
   
3. //------------------------------------------------方法一  
4. int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);  
5. int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);  
6. imageView.measure(w, h);  
7. int height =imageView.getMeasuredHeight();  
8. int width =imageView.getMeasuredWidth();  
9. textView.append("\n"+height+","+width);  
10.   
11.   
12.   
13.   
14. //-----------------------------------------------方法二  
15. ViewTreeObserver vto = imageView.getViewTreeObserver();  
16. vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {  
17.     public boolean onPreDraw() {  
18.         int height = imageView.getMeasuredHeight();  
19.         int width = imageView.getMeasuredWidth();  
20.         textView.append("\n"+height+","+width);  
21.         return true;  
22.     }  
23. });  
24. //-----------------------------------------------方法三     
25. ViewTreeObserver vto2 = imageView.getViewTreeObserver();    
26. vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {  
27.     @Override    
28.     public void onGlobalLayout() {  
29.         imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);    
30.         textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth());  
31.     }    
32. });