Android的TextView中具有的高度和宽度0 [英] Android TextView has height and width of 0

问题描述

我有一个小的项目，我想重复使用某个UI组件的几个时间，所以我通过扩张的ViewGroup创建一个小部件。在此我的ViewGroup充气包含一个TextView一个的LinearLayout内并补充说，膨胀欣赏到的ViewGroup槽addView景色。

外的LinearLayout扩大自身完美，但内部的TextView拥有的getHeight（）= 0和getWith（）= 0，当我通过层次结构查看器查看。但奇怪的是，layout_height和layout_width的价值观我在XML给了他们。

我没有code在这里，但它看起来是这样的：

XML：

 ＆LT;的LinearLayout
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =FILL_PARENT＆GT;

    ＆LT;的TextView
        机器人：文本=随机文字。
        机器人：layout_with =200px的
        机器人：layout_height =50像素/＆GT;
＆LT; / LinearLayout中＆GT;
 

Java的：

 类进myWidget扩展的ViewGroup {
...

//在构造函数中
MyView的= View.inflate（背景下，R.layout.xml，NULL）;
addView（MyView的）;

//在布局
myView.layout（L，T，R，B）;
 

我曾试图给出大小我的文本视图FILL_PARENT值，但它并没有帮助。

解决方案

  

切记：的getHeight（）和 getWith（）返回 0 的如果组件尚未领取的

---

要找到查看的正在起草前的宽度和高度：的

1. 第一次调用测量

     view.measure（MeasureSpec.UNSPECIFIED，MeasureSpec.UNSPECIFIED）
    

2. 现在，您可以使用 getMeasuredWidth 和高度使用 getMeasuredHeight

   获得宽度

     INT宽度= view.getMeasuredWidth（）;
   INT高= view.getMeasuredHeight（）;
    

---

我已经发布了一些更多的想法： 如何获得宽度/高度查看

I have a small project where I want to reuse a certain UI component a few time so I created a widget by expanding a ViewGroup. In that ViewGroup I inflated a view that contained a TextView inside a LinearLayout and added that inflated view to the ViewGroup trough addView.

The outer LinearLayout expands itself perfectly but the inner TextView have getHeight() = 0 and getWith() = 0 when I view it through Hierarchy Viewer. The strange thing is that layout_height and layout_width is the values I gave them in my xml.

I don't have the code here but it looked something like this:

xml:

<LinearLayout  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent">  

    <TextView  
        android:text="random text.."  
        android:layout_with="200px"  
        android:layout_height="50px" />  
</LinearLayout>  

Java:

class MyWidget extends ViewGroup {
...

//In constructor  
myView = View.inflate(context, R.layout.xml, null);  
addView(myView);  

//In layout  
myView.layout(l, t, r, b);  

I have tried to give my text view fill_parent values for size but it didn't help.

解决方案

Remember:getHeight() and getWith()return 0 if components are not drawn yet.

---

To find the width And height of a View before it being drawn:

1. First call measure

   view.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED)
   

2. Now you can get width using getMeasuredWidth and height using getMeasuredHeight

   int width = view.getMeasuredWidth();
   int height = view.getMeasuredHeight();
   

---

I have posted some more ideas: How to get width/height of a View

这篇关于Android的TextView中具有的高度和宽度0的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！