Android在onCreate()中获得控件尺寸

方法如下：
@Override   public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);       final ImageView 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);       int height =imageView.getMeasuredHeight();      int width =imageView.getMeasuredWidth();      textView.append("\n"+height+","+width);      System.out.println("执行完毕.."+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(new ViewTreeObserver.OnPreDrawListener() {     public boolean onPreDraw() {         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 void onGlobalLayout() {         imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);           textView.append("\n\n"+imageView.getHeight()+","+imageView.getWidth());     }   });
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