Android 在片段中获取布局高度和宽度 [英] Android get layout height and width in a fragment

问题描述

我正在处理一个片段，我想获取 xml fragment layout 中包含的 layout 的维度.当我尝试代码时

I am working on a fragment and I want to get the dimension of a layout contained in the xml fragment layout. When I try the code

RelativeLayout myLayout = view.findViewById(R.id.myLayout);
myLayout.getHeight();

它返回0.我需要这些尺寸才能将其他对象放入 myLayout 中.

it returns 0. I need these dimensions to put inside myLayout other objects.

我尝试使用:

myLayout.getViewTreeObserver().addOnGlobalLayoutListener( 
    new ViewTreeObserver.OnGlobalLayoutListener(){

        @Override
        public void onGlobalLayout() {
            mHeight = myLayout.getHeight();  
            mWidth= myLayout.getWidth();
            System.out.println("width: "+mWidth+"   height: "+mHeight);
         }
});

但是这段代码调用了很多时间，我不知道它什么时候执行.我需要将这些维度放入 public void onActivityCreated() 方法中.是否可以?

but this code is invoke a lot of time and I don't know exactly when it is execute. I need these dimensions into public void onActivityCreated () method. Is it possible?

推荐答案

对此有一个更简洁的解决方案，只需在片段的根视图上使用 View.post() 方法，您就可以调用getMeasuredHeight()/getMeasuredWidth() 并获取实际值.

There's a cleaner solution to this, just use the View.post() method on your fragment's root view, and you can call getMeasuredHeight()/getMeasuredWidth() and get the actual values.

例如

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.myfragment, container, false);

    root.post(new Runnable() {
        @Override
        public void run() {
            // for instance
            int height = root.getMeasuredHeight(); 
        }
    });

    return root;
}

使用 ViewTreeObserver 非常整洁，没有杂乱无章.

Very neat and tidy and no messy mucking about with the ViewTreeObserver.

我只在 android-23 设备上测试过这个，但是 API 从 1 级开始就有这个方法了.

I've only tested this with android-23 devices, but the API has had this method since level 1.

无论如何，WFM.

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