您好,我想通过全局布局监听器获取相对布局的高度和宽度:
final RelativeLayout relativeLayout = binding.rl;
relativeLayout.getViewTreeObserver()
.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// TODO Auto-generated method stub
width = relativeLayout.getWidth();
height = relativeLayout.getHeight();
relativeLayout.getViewTreeObserver()
.removeOnGlobalLayoutListener(this);
}
});
我的代码的问题是宽度和高度都为零。有人可以告诉我任何解决方案吗?提前致谢。
<RelativeLayout
android:id="@+id/rl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dp12">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>
最佳答案
如果您没有其他选择,请尝试使用 getMeasuredWidth() 或 getMeasuredHeight() :
relativeLayout.measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
int width = relativeLayout.getMeasuredWidth();
int height = relativeLayout.getMeasuredHeight();
但是根据你的问题,仅当高度或重量大于0时才尝试删除OnGlobalLayoutListener,因为如果你的布局宽度/高度是“wrap_content”,它实际上可能是0:
relativeLayout.getViewTreeObserver()
.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// TODO Auto-generated method stub
width = relativeLayout.getWidth();
height = relativeLayout.getHeight();
if (width > 0) {
relativeLayout.getViewTreeObserver()
.removeOnGlobalLayoutListener(this);
}
}
});
关于java - 全局布局监听器返回 0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60072544/