Android初级教程_获取Android控件的宽和高

通过以下方法可以在onCreate中获取宽高

 1     //------------------------------------------------方法一  
 2     int w = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);  
 3     int h = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED);  
 4     imageView.measure(w, h);  
 5     int height =imageView.getMeasuredHeight();  
 6     int width =imageView.getMeasuredWidth();  
 7     textView.append("\n"+height+","+width);  
 8       
 9       
10       
11       
12     //-----------------------------------------------方法二  
13     ViewTreeObserver vto = imageView.getViewTreeObserver();  
14     vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {  
15         public boolean onPreDraw() {  
16             int height = imageView.getMeasuredHeight();  
17             int width = imageView.getMeasuredWidth();  
18             textView.append("\n"+height+","+width);  
19             return true;  
20         }  
21     });  
22     //-----------------------------------------------方法三     
23     ViewTreeObserver vto2 = imageView.getViewTreeObserver();    
24     vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {  
25         @Override    
26         public void onGlobalLayout() {  
27             imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);    
28             textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth());  
29         }    
30     });