Java 视图的高度和宽度始终为0（getMeasuredHeight（）和getHeight（）都不工作）

我在

LinearLayout

内部有一个

LinearLayout

，子

LinearLayout

有其

布局参数

，其中

高度和
宽度定义为

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

现在，在创建视图之后，我正在尝试从
getHeight（）
和
getmeasuredheath（）
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();

为什么这两种方法都返回视图的0高度？这些方法何时返回实际结果？如何获取我创建的视图的高度？
试试下面的代码

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);
      }
});

试试这个代码

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);
      }
});

按以下步骤做-

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

按以下步骤做-

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