Java ConstraintLayout中消失的元素会留下重影空间
因此,我有一个Java ConstraintLayout中消失的元素会留下重影空间,java,android,android-layout,android-constraintlayout,android-viewholder,Java,Android,Android Layout,Android Constraintlayout,Android Viewholder,因此,我有一个RecycleView的布局文件,它具有可展开/可折叠的视图保持架 单击标题将展开/折叠额外的数据。在编辑器中一切看起来都很好。但是,它会有一个类似于layout\u marginBottom的重影空间 首次加载的外观 扩展 正确折叠 因此编辑器将只显示ViewHolder,如图2和图3所示。 然而,当在设备上运行时,它将首先显示图1,然后单击它展开后,它将显示图2。再次折叠它将显示图3而不是图1。它将继续显示正确的数字(2和3) 图2中的额外内容与标题有共同的父项,标题是C
RecycleView
的布局文件,它具有可展开/可折叠的视图保持架
单击标题将展开/折叠额外的数据。在编辑器中一切看起来都很好。但是,它会有一个类似于layout\u marginBottom
的重影空间
首次加载的外观
扩展
正确折叠
因此编辑器将只显示ViewHolder
,如图2和图3所示。
然而,当在设备上运行时,它将首先显示图1,然后单击它展开后,它将显示图2。再次折叠它将显示图3而不是图1。它将继续显示正确的数字(2和3)
图2中的额外内容与标题有共同的父项,标题是ConstraintLayout
无论说明符是以编程方式还是XML方式,都会发生这种情况
使用activity.runOnUIThread
没有帮助。使用new Handler().onPostDelayed
只会更糟糕,如图1所示,但会有更多不需要的空间,如图2所示,只是没有额外的信息
以下是XML文件:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
app:cardCornerRadius="10dp">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/validity"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0">
<ImageButton
android:id="@+id/expand"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:layout_marginRight="8dp"
android:layout_marginEnd="8dp"
app:srcCompat="@drawable/ic_right" />
<TextView
android:id="@+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ellipsize="end"
android:maxLines="1"
android:textColor="@color/textDark" />
</LinearLayout>
<View
android:id="@+id/divider"
android:layout_width="0dp"
android:layout_height="2dp"
android:layout_marginEnd="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_marginStart="16dp"
android:background="@color/colorSecondaryDark"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/header" />
<TextView
android:id="@+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="8dp"
android:layout_marginStart="10dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toStartOf="@+id/size"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/divider" />
<TextView
android:id="@+id/size"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/divider" />
<TextView
android:id="@+id/amount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="8dp"
android:layout_marginStart="10dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toStartOf="@+id/validity"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/date" />
<LinearLayout
android:id="@+id/validity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="8dp"
android:gravity="center_vertical"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/size">
<ImageView
android:id="@+id/help"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_weight="1"
android:contentDescription="@string/backup_layout_help_desc"
app:srcCompat="@drawable/ic_help" />
<TextView
android:id="@+id/invalid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/backup_layout_invalid"
android:textAllCaps="true"
android:textColor="@color/red" />
</LinearLayout>
<TextView
android:id="@+id/passwords"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginStart="10dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/amount" />
<Button
android:id="@+id/delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="8dp"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:background="@android:color/transparent"
android:text="@string/backup_layout_delete"
android:textColor="@color/red"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/importshare"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/passwords"
app:layout_constraintVertical_bias="1.0" />
<LinearLayout
android:id="@+id/importshare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/validity"
app:layout_constraintVertical_bias="1.0">
<Button
android:id="@+id/commit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@android:color/transparent"
android:text="Import"
android:textColor="@color/yellow" />
<ImageButton
android:id="@+id/share"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@android:color/transparent"
android:contentDescription="Share"
android:padding="10dp"
app:srcCompat="@drawable/ic_share" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
科特林
当我试图在键盘打开时隐藏元素时,我遇到了一个非常类似的问题
当您打开键盘时,会发生两次大小调整,一次调整开口和键盘,另一次调整将视图设置为消失。问题是,第二次调整只会在另一个元素请求布局时发生,因此您的屏幕会明显地跳转两次
class MainActivity : AppCompatActivity() {
private var activityHeight = 0
private var keyboardOpen = false
private var mainScreen : ConstraintLayout? = null
private var infoText : TextView? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main_screen)
mainScreen = findViewById(R.id.mainConstraintLayout)
infoText = findViewById(R.id.mainInfoText)
//...
/* Capture initial screen size */
this@MainActivity.window.decorView.doOnNextLayout {
val displayFrame : Rect = Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(displayFrame)
activityHeight = displayFrame.height()
}
/* Check for keyboard open/close */
this@MainActivity.window.decorView.addOnLayoutChangeListener { v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom ->
val drawFrame : Rect = Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(drawFrame)
val currentSize = drawFrame.height()
if(keyboardOpen){
keyboardOpen = currentSize < activityHeight
if (!keyboardOpen){
infoText?.visibility = View.VISIBLE
}
}else {
keyboardOpen = currentSize < activityHeight
if(keyboardOpen) {
infoText?.visibility = View.GONE
/* Request a new layout on your base layout so screen adjusts correctly */
mainScreen?.requestLayout()
}
}
}
}
}
class MainActivity:AppCompatActivity(){
私有变量activityHeight=0
私有var键盘打开=错误
私有变量主屏幕:ConstraintLayout?=null
私有变量infoText:TextView?=null
重写创建时的乐趣(savedInstanceState:Bundle?){
super.onCreate(savedInstanceState)
setContentView(右布局主屏幕)
mainScreen=findViewById(R.id.mainConstraintLayout)
infoText=findViewById(R.id.mainInfoText)
//...
/*捕获初始屏幕大小*/
this@MainActivity.window.decorView.doOnNextLayout {
val displayFrame:Rect=Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(显示框)
activityHeight=displayFrame.height()
}
/*检查键盘是否打开/关闭*/
this@MainActivity.window.decorView.addOnLayoutChangeListener{v,左,上,右,下,左,左,右,右->
val drawFrame:Rect=Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(牵引架)
val currentSize=drawFrame.height()
如果(键盘打开){
键盘打开=当前大小<活动高度
如果(!键盘打开){
infoText?.visibility=View.visibility
}
}否则{
键盘打开=当前大小<活动高度
如果(键盘打开){
infoText?.visibility=View.GONE
/*在基本布局上请求新布局,以便屏幕正确调整*/
主屏幕?.requestLayout()
}
}
}
}
}
如果ConstraintLayout的目的是消除嵌套,为什么要有嵌套的LinearLayout?页眉需要LinearLayout,但是其他的,既然你说没有必要了。我只是不知道如何在ConstraintLayouts.using constraints and chains中水平居中。我看不出代码,但我打赌如果您为所有视图临时设置不同的背景色(不是白色),您将看到哪个视图占用了该空间。结果显示两个视图显示为不可见,尽管它被指定为已消失
。不知道为什么,但在修改了适配器以从不将其设置为不可见
和不可见
后,一切都变好了。顺便说一句,这两个视图分别是TextView
和ImageView
。
class MainActivity : AppCompatActivity() {
private var activityHeight = 0
private var keyboardOpen = false
private var mainScreen : ConstraintLayout? = null
private var infoText : TextView? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main_screen)
mainScreen = findViewById(R.id.mainConstraintLayout)
infoText = findViewById(R.id.mainInfoText)
//...
/* Capture initial screen size */
this@MainActivity.window.decorView.doOnNextLayout {
val displayFrame : Rect = Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(displayFrame)
activityHeight = displayFrame.height()
}
/* Check for keyboard open/close */
this@MainActivity.window.decorView.addOnLayoutChangeListener { v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom ->
val drawFrame : Rect = Rect()
this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(drawFrame)
val currentSize = drawFrame.height()
if(keyboardOpen){
keyboardOpen = currentSize < activityHeight
if (!keyboardOpen){
infoText?.visibility = View.VISIBLE
}
}else {
keyboardOpen = currentSize < activityHeight
if(keyboardOpen) {
infoText?.visibility = View.GONE
/* Request a new layout on your base layout so screen adjusts correctly */
mainScreen?.requestLayout()
}
}
}
}
}