视图的高度和宽度始终为0（getMeasuredHeight（）和getHeight（）都不起作用）

Question

我在LinearLayout内有LinearLayout而子linearlayout有layout params，height和width定义为

LinearLayout linearLayout=new LinearLayout(context);
        LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(50,50);
        linearLayout.setLayoutParams(lp);

现在，在创建视图后，我尝试从getHeight()和getMeasuredHeight()获取视图的高度，但这两种方法都返回 0 。 ？

  int heightofView=linearLayout.getHeight(); 
  int heightofview=linearLayout.getMeasuredHeight();

为什么这两个方法都返回0视图的高度？当这些方法返回实际结果时？如何获得我创建的视图的高度？

Answer 1

试试这段代码。

imageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
           int width = imageView.getWidth();
           int height = imageView.getHeight();
           //you can add your code here on what you want to do to the height and width you can pass it as parameter or make width and height a global variable
           imageView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
      }
});

Answer 2

执行以下操作 -

linearLayout.post(new Runnable() {
            @Override
            public void run() {
                int linearLayoutHeight = linearLayout.getHeight();
                Log.e("MS", "linearLayout Ht = " + linearLayoutHeight);
            }
        });