Android 在Oncreate中獲取控件的高度

@Override 

  public void onCreate(BundlesavedInstanceState) { 

     super.onCreate(savedInstanceState); 

     setContentView(R.layout.main); 

      finalImageView imageView = (ImageView) findViewById(R.id.imageview);     

      int w=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 

      int h=View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 

     imageView.measure(w, h); 

      intheight =imageView.getMeasuredHeight();

      intwidth =imageView.getMeasuredWidth();

     textView.append("\n"+height+","+width);

     System.out.println("執行完畢.."+System.currentTimeMillis()); 

  }

//------------------------------------------------方法一 

int w =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 

int h =View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 

imageView.measure(w, h); 

int height=imageView.getMeasuredHeight(); 

int width=imageView.getMeasuredWidth(); 

textView.append("\n"+height+","+width); 

//-----------------------------------------------方法二 

ViewTreeObserver vto =imageView.getViewTreeObserver(); 

vto.addOnPreDrawListener(newViewTreeObserver.OnPreDrawListener() { 

    public booleanonPreDraw() { 

       int height =imageView.getMeasuredHeight(); 

       int width =imageView.getMeasuredWidth(); 

      textView.append("\n"+height+","+width); 

       return true; 

   } 

}); 

//-----------------------------------------------方法三   

ViewTreeObserver vto2 = imageView.getViewTreeObserver();  

vto2.addOnGlobalLayoutListener(new OnGlobalLayoutListener(){ 

    @Override  

    public voidonGlobalLayout() { 

      imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);  

      textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth()); 

    }  

});