Kotlin 以编程方式添加时不显示MaterialCardView
以编程方式添加时,我无法在活动中看到MaterialViewCard。如果我直接在XML上添加,它会显示。但当通过Koling添加时,它不会 XML示例:Kotlin 以编程方式添加时不显示MaterialCardView,kotlin,programmatically-created,materialcardview,Kotlin,Programmatically Created,Materialcardview,以编程方式添加时,我无法在活动中看到MaterialViewCard。如果我直接在XML上添加,它会显示。但当通过Koling添加时,它不会 XML示例: <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/re
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SecondFragment">
<LinearLayout
android:id="@+id/layout_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<LinearLayout
android:id="@+id/layout_first_block"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<com.google.android.material.card.MaterialCardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:cardBackgroundColor="@color/surface"
android:layout_margin="2dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00"
android:textColor="@color/on_surface"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:cardBackgroundColor="@color/surface"
android:layout_margin="2dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="01"
android:textColor="@color/on_surface"/>
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:cardBackgroundColor="@color/surface"
android:layout_margin="2dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="03"
android:textColor="@color/on_surface"/>
</com.google.android.material.card.MaterialCardView>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:layout_weight="1">
<Button
android:id="@+id/button_second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/previous"/>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
但是,当我尝试这个(下面)将不起作用。
XML:
有什么想法吗
谢谢 不确定您的问题,但建议调试。1) 使用层次结构查看器确认视图已正确添加2)使用“显示布局边界”调试选项以确认视图是否正确布局3)在XML中声明子视图并对其进行膨胀,而不是以编程方式进行4)考虑使用GRIDLAUDFEAM管理器来使用RealdReVIEW。谢谢你,伙计!
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SecondFragment">
<LinearLayout
android:id="@+id/layout_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<LinearLayout
android:id="@+id/layout_first_block"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="1">
<!-- Will add here-->
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:layout_weight="1">
<Button
android:id="@+id/button_second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/previous"/>
</LinearLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
view.findViewById<Button>(R.id.button_second).setOnClickListener {
findNavController().navigate(R.id.action_SecondFragment_to_FirstFragment)
}
val layoutFirstBlock: LinearLayout = view.findViewById<LinearLayout>(R.id.layout_first_block)
for (r in 1..10){
val row: LinearLayout = LinearLayout(context)
row.orientation = LinearLayout.HORIZONTAL
row.layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)
for(c in 1..10){
val card: MaterialCardView = MaterialCardView(context)
val marginParams: ViewGroup.MarginLayoutParams = ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
marginParams.setMargins(R.dimen.small_padding, R.dimen.small_padding, R.dimen.small_padding, R.dimen.small_padding)
card.layoutParams = marginParams
card.setBackgroundColor(resources.getColor(R.color.surface, context?.theme))
val num: TextView = TextView(context)
num.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
val value = ((r-1)*10 + c).toString()
num.text = value
num.setTextColor(resources.getColor(R.color.on_surface, context?.theme))
Log.d("i", "i$r$c = $value")
card.addView(num)
row.addView(card)
}
layoutFirstBlock.addView(row, 0)
}
}