Android编程获取控件宽和高的方法总结分析

现在碰到这个问题我们不能不解决,在网上找到了如下办法:

//------------------------------------------------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("nn"+imageView.getHeight()+","+imageView.getWidth());
  }
});

这三个方法是哪里找到现在已经忘了.

现在要讨论的是当我们需要时候使用哪个方法呢?

现在把测试的Activity改成如下:

@Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   final ImageView imageView = (ImageView) findViewById(R.id.imageview);
   //------------------------------------------------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);
   System.out.println("执行完毕.."+System.currentTimeMillis());
 }