假设我有一个类似的视图结构
<ConstraintLayout>
<CustomViewLayout>
...
...
</CustomViewLayout>
</ConstraintLayout>
这是简化的,但我在底部工作表中使用上面的内容,我有时会根据我的CustomViewLayout高度更改ConstraintLayout的高度和底部工作表的峰值高度.我的问题是,如果CustomViewLayout的一部分被切断,那就是 – 它有点在屏幕之外,因为ConstraintLayout不够高 – 我不再能够获得正确的“全高”.在这种情况下,我总是只看到视图屏幕上的可见部分.
那么如何才能获得部分偏离屏幕的视图的全高?
谢谢!
编辑:
我应该补充说,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之外时,这些都不会测量整个高度.
解决方法
为了检查我之前的答案,我开发了一个测试项目来检查确切的情况.当它的某些部分位于屏幕之外时,测量布局高度是成功的(布局高度测量为4231px,屏幕高度为1920px).如果视图足够长并且屏幕未完全显示,则应将其放在可滚动视图中.因此,我将customViewLayout放在nestedScrollView中,以便在底部工作表展开后使用剩余滚动量.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>
主要活动:
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: