在使用view.measure()测量具有恒定维度的视图后,getMeasuredHeight()和getMeasureWidth()返回0.
layout_view.xml,用于创建视图的布局
- <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="100dp"
- android:layout_height="100dp">
- </FrameLayout>
测量尺寸的功能
- public void measureView(Context context){
- LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
- View view = inflater.inflate(R.layout.layout_view,null,false);
- view.measure( View.MeasureSpec.UNSPECIFIED,View.MeasureSpec.UNSPECIFIED);
- Log.d(TAG,"Error width : " + view.getMeasuredWidth());
- Log.d(TAG,"Error heeght : " + view.getMeasuredHeight());
- }
解决方法
当您调用onCreate()或onCreateView()中的view.getMeasuredWidth()时,该视图尚未绘制.所以,您需要添加一个listen,并在绘制视图时获取回调.就像我的代码一样：
- ViewTreeObserver vto = view.getViewTreeObserver();
- vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
- @Override
- public void onGlobalLayout() {
- int viewWidth = view.getMeasuredWidth();
- // handle viewWidth here...
- if (Build.VERSION.SDK_INT<16) {
- v.getViewTreeObserver().removeGlobalOnLayoutListener(this);
- } else {
- v.getViewTreeObserver().removeOnGlobalLayoutListener(this);
- }
- });
- v.getViewTreeObserver()
