如何在片段中获取按钮的宽度/高度
如何在片段中获取按钮的宽度/高度
提问于 2016-05-27 07:30:47
如何在片段中获取任意视图(Button、TextView、RelativeLayout)的高度/宽度，我尝试这样的方法
public static class FirstDemoFragment extends Fragment {
int width,height;
private Button button;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, container, false);
button = (Button) view.findViewById(R.id.fragment_demo_button);
width = button.getWidth();
height = button.getHeight();
System.out.println("==== View Width : " + width);
System.out.println("==== View height : " + height);
width = button.getMeasuredWidth();
height = button.getMeasuredHeight();
System.out.println("==== View Width : " + width);
System.out.println("==== View height : " + height);
return view;
}我的layout.xml文件是
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/does_really_work_with_fragments"
android:id="@+id/fragment_demo_button"
android:layout_centerInParent="true" />
我对此做了一点研究，我用这种方法在活动中找到了按钮的宽度/高度。
@Override
public void onWindowFocusChanged(boolean hasFocus) {
// TODO Auto-generated method stub
super.onWindowFocusChanged(hasFocus);
relMain = (RelativeLayout) findViewById(R.id.layoutMain);
width = relMain.getMeasuredWidth();
height = relMain.getMeasuredHeight();
width = relMain.getWidth();
height = relMain.getHeight();
//System.out.println("=== Width : " + width);
//System.out.println("=== height : " + height);
}但是onWindowFocusChanged()在android片段中是不可用的？
回答 3
Stack Overflow用户
回答已采纳
发布于 2016-05-27 07:42:06
在片段中，在片段的onCreateView方法中尝试下面的代码：
button = (Button) view.findViewById(R.id.fragment_demo_button);
ViewTreeObserver vto = button.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
button.getViewTreeObserver().removeOnPreDrawListener(this);
Log.d("", "Height: " + button.getMeasuredHeight()+ " Width: " + button.getMeasuredWidth());
return true;
}
});Stack Overflow用户
发布于 2016-05-27 07:35:37
在片段中使用以下代码片段的onCreateView方法
ViewTreeObserver mviewtreeobs = button.getViewTreeObserver();
mviewtreeobs .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
width = button.getWidth();
height = button.getHeight();
}
});Stack Overflow用户
发布于 2016-05-27 07:39:12
您可以将布局侦听器添加到按钮中，如下所示：
button.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
int width = button.getWidth();
if(width > 0){
int height = button.getHeight();
// do something with your width and height
....
// remove layout listener
button.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37477420
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