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()
