getMeasuredHeight()与getHeight的区别
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关于getMeasuredHeight()与getHeight的区别,许多的文章都有讲述,但是实际上说的都是“浪漫的废话"。不得不承认必须从官方的文档中找答案。
但是,实际上在当屏幕可以包裹内容的时候,他们的值相等,只有当view超出屏幕后,才能看出他们的区别:getMeasuredHeight()是实际View的大小,与屏幕无关,而getHeight的大小此时则是屏幕的大小。当超出屏幕后,getMeasuredHeight()等于getHeight()加上屏幕之外没有显示的大小
在来看这个例子:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="fill_parent" android:text="TextView" /> </LinearLayout>
System.out.println( "getMeasuredHeight()--------------->"+textView.getMeasuredHeight());
System.out.println( "getHeight()--------------->"+textView.getHeight());
出现的结果是这两个的大小是一样的,都是屏幕的大小。所以简单的认为getHeight()是view实际的大小也是不会的,它同样与布局有关。
用于在Activity中间获得控件的大小的方法:
ViewTreeObserver vto = textView.getViewTreeObserver();vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {public boolean onPreDraw() {System.out.println( "getMeasuredHeight()textview--------------->"+textView.getMeasuredHeight());System.out.println( "getHeight()textview--------------->"+textView.getHeight());return true;}});动态改变布局大小的方法:
LayoutParams lp = 控件id.getLayoutParams();
lp.height = 480;
控件id.setLayoutParams(lp);
使用id.setLayoutParams(lp)之后,还需要添加id.requestLayout();
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