假设我有一个类似的视图结构
<ConstraintLayout>
<CustomViewLayout>
...
...
</CustomViewLayout>
</ConstraintLayout>
这是简化的方法,但是我在底页中使用了上面的内容,有时我根据ConstraintLayout
的高度更改CustomViewLayout
的高度和底页的窥视高度。我的问题是,如果CustomViewLayout
的一部分被切除,那就是-它在屏幕之外,因为ConstraintLayout
不够高-我将无法获得正确的“全高”。在那种情况下,我似乎总是只能在视图的屏幕上看到可见的部分。
那么如何获得部分不在屏幕上的视图的整个高度?
谢谢!
编辑:
我应该补充一点,我尝试过的是globalLayoutListener
以及customViewLayout.post {}
(当然还有通常的customViewLayout.height
)。但是,当视图的一部分位于屏幕外部时,这些方法都无法测量整个高度。
答案 0 :(得分:2)
要检查我以前的答案,我开发了一个测试项目来检查确切的情况。当布局的某些部分位于屏幕外部时,可以成功测量布局高度(布局高度为 4231px ,其中屏幕高度为 1920px )。如果视图足够长,无法完全显示在屏幕上,则应将其置于可滚动视图中。因此,我将customViewLayout
放在NestedScrollView
中,以在底页扩展后消耗剩余的滚动量。这是代码和结果:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:showIn="@layout/activity_main"
tools:context=".MainActivity">
<android.support.constraint.ConstraintLayout
android:id="@+id/layoutBottomSheet"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/customViewLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="@color/colorAccent">
<TextView
android:id="@+id/stateTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#FFFFFF"
android:layout_marginTop="16dp"
android:gravity="center_horizontal"/>
<TextView
android:id="@+id/sizeTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#FFFFFF"
android:padding="24dp"
android:gravity="center_horizontal"/>
<TextView
android:id="@+id/contentTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#FFFFFF"
android:padding="24dp"
android:text="@string/lorem"
android:gravity="center_horizontal"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.constraint.ConstraintLayout>
</android.support.design.widget.CoordinatorLayout>
MainActivity:
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar)
customViewLayout.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
override fun onGlobalLayout() {
customViewLayout.viewTreeObserver.removeGlobalOnLayoutListener(this)
val height = customViewLayout.measuredHeight
val width = customViewLayout.measuredWidth
sizeTextView.text = "Height: $height px Width: $width px"
}
})
val sheetBehavior = BottomSheetBehavior.from(layoutBottomSheet)
sheetBehavior.setBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
override fun onSlide(bottomSheet: View, offset: Float) {
}
override fun onStateChanged(bottomSheet: View, newState: Int) {
when (newState) {
BottomSheetBehavior.STATE_HIDDEN -> stateTextView.text = "State: Hidden"
BottomSheetBehavior.STATE_EXPANDED -> stateTextView.text = "State: Expanded"
BottomSheetBehavior.STATE_COLLAPSED -> stateTextView.text = "State: Collapsed"
BottomSheetBehavior.STATE_DRAGGING -> stateTextView.text = "State: Dragging"
BottomSheetBehavior.STATE_SETTLING -> stateTextView.text = "State: Settling"
}
}
})
}
}
屏幕:
答案 1 :(得分:0)
如果您要查找视图的宽度和高度,请尝试以下操作:
mCustomViewLayout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mCustomViewLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
int height = mCustomViewLayout.getMeasuredHeight()
int width = mCustomViewLayout.getMeasuredWidth()
}
});