在运行时获取布局高度和宽度android [英] get layout height and width at run time android

问题描述

如何获得在 xml 中定义为 fill_parent 的线性布局的宽度和高度?我尝试过 onmeasure 方法，但我不知道为什么它没有给出确切的值.在 oncreate 方法完成之前，我需要在 Activity 中使用这些值.

How can I get width and height of a linear layout which is defined in xml as fill_parent both in height and width? I have tried onmeasure method but I dont know why it is not giving exact value. I need these values in an Activity before oncreate method finishes.

推荐答案

假设我必须获得一个在 XML 中定义的 LinearLayout 宽度.我必须通过 XML 获得它的参考.定义 LinearLayout l 作为实例.

Suppose I have to get a LinearLayout width defined in XML. I have to get reference of it by XML. Define LinearLayout l as instance.

 l = (LinearLayout)findviewbyid(R.id.l1);
ViewTreeObserver observer = l.getViewTreeObserver();
        observer.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

            @Override
            public void onGlobalLayout() {
                // TODO Auto-generated method stub
                init();
            l.getViewTreeObserver().removeGlobalOnLayoutListener(
                    this);
        }
    });

protected void init() {
        int a= l.getHeight();
            int b = l.getWidth();
Toast.makeText(getActivity,""+a+" "+b,3000).show();
    } 
    callfragment();
}  

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