您好，我尝试在我的自定义 View 中添加 View 绑定(bind)，但不幸的是我的自定义 View 不可见，一切正常，但是当我打开 Activity 时，自定义 View 未显示
我的自定义 View 类
class StickerView @JvmOverloads constructor(
context: Context,
attributeSet: AttributeSet?=null,
defStyle:Int = 0
) : ConstraintLayout(context,attributeSet,defStyle),View.OnClickListener {
private val binding = ItemStickerBinding.inflate(LayoutInflater.from(context),this,true)
private var segmentedVerticalSeekBar: SegmentedVerticalSeekBar? = null
private var btn1: ImageButton?=null
private var btn2: ImageButton?=null
private var btn3: ImageButton?=null
private var btn4: ImageButton?=null
private var btn5: ImageButton?=null
private var btn6: ImageButton?=null
private var btn0: ImageButton?=null
init {
init(context)
}
override fun onClick(v: View?) {
when(v?.id){
R.id.appCompatButton ->{
}
R.id.appCompatButton1 ->{
}
R.id.appCompatButton2 ->{
}
R.id.appCompatButton3 ->{
}
R.id.appCompatButton4 ->{
}
R.id.appCompatButton5 ->{
}
R.id.appCompatButton6 ->{
}
}
}
private fun init(context: Context){
inflate(context,R.layout.item_sticker,this)
segmentedVerticalSeekBar = binding.svsLevelView
btn0 = binding.appCompatButton
btn1 = binding.appCompatButton1
btn2 = binding.appCompatButton2
btn3 = binding.appCompatButton3
btn4 = binding.appCompatButton4
btn5 = binding.appCompatButton5
btn6 = binding.appCompatButton6
btn6?.setOnClickListener(this)
}
override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
}
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
setMeasuredDimension(Int.MAX_VALUE,400)
}
}
主要 Activity
<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"
android:orientation="vertical"
android:background="@color/background"
tools:context=".MainActivity">
<com.example.emoticker.StickerView
android:id="@+id/stickerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<include layout="@layout/item_sticker"/>
</com.example.emoticker.StickerView>
</androidx.constraintlayout.widget.Constraint
我的自定义 View 布局 item_sticker.xml
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="150dp"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/background"
tools:context=".StickerView"
xmlns:app="http://schemas.android.com/apk/res-auto">
<com.ss.svs.SegmentedVerticalSeekBar
android:id="@+id/svsLevelView"
android:layout_width="60dp"
android:layout_height="0dp"
android:layout_gravity="center"
android:layout_marginStart="20dp"
android:layout_marginTop="15dp"
android:layout_marginBottom="15dp"
app:backgroundColor="@color/white"
app:cornerRadius="10dp"
app:currentValue="2"
app:delimiterColor="@color/white"
app:isAllRadius="true"
app:layout_constraintBottom_toTopOf="@+id/appCompatButton6"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:maxValue="4"
app:progressColor="@color/color_progress"
app:pyramidViewEnable="true"
app:step="1"
app:touchDisabled="false" />
<ImageView
android:layout_width="100dp"
android:layout_height="0dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
app:layout_constraintBottom_toTopOf="@+id/linearLayout"
app:layout_constraintEnd_toEndOf="@+id/linearLayout"
app:layout_constraintStart_toStartOf="@+id/linearLayout"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="@+id/linearLayout"
android:layout_width="0dp"
android:layout_height="30dp"
android:layout_marginStart="20dp"
android:layout_marginEnd="15dp"
android:layout_marginBottom="5dp"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/svsLevelView">
<ImageButton
android:id="@+id/appCompatButton"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/laughing_emoji_svgrepo_com" />
<ImageButton
android:id="@+id/appCompatButton1"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/scare_svgrepo_com" />
<ImageButton
android:id="@+id/appCompatButton2"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/crying_emoji_svgrepo_com" />
<ImageButton
android:id="@+id/appCompatButton3"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/sick_svgrepo_com" />
<ImageButton
android:id="@+id/appCompatButton4"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/shocked_emoji_svgrepo_com" />
<ImageButton
android:id="@+id/appCompatButton5"
android:layout_width="0dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:layout_marginStart="5dp"
android:layout_marginEnd="5dp"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/angry_svgrepo_com" />
</LinearLayout>
<ImageButton
android:id="@+id/appCompatButton6"
android:layout_width="50dp"
android:layout_height="30dp"
android:layout_gravity="center"
android:layout_weight="1"
android:background="@color/white"
android:src="@drawable/ic_baseline_subdirectory_arrow_left_24"
app:layout_constraintBottom_toBottomOf="@+id/linearLayout"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/linearLayout" />
</androidx.constraintlayout.widget.ConstraintLayout>
如果你能帮助我，我很感激你们 抱歉我的英语不好
最佳答案
您正在覆盖 onLayout 但其中没有代码。因此，当 View 需要自行布局时……它不需要!删除 onLayout 函数，它应该可以工作。
此外，不要在 init 函数中调用 inflate。您已经扩充了布局并将其添加到此处的自定义 View 中:
private val binding = ItemStickerBinding.inflate(LayoutInflater.from(context),this,true)
如果再次膨胀，则会创建一个新布局并替换旧布局。 binding 是从旧布局创建的，它的所有引用都指向旧 View 。
你也不想要这个，这是一个重复的布局:
<include layout="@layout/item_sticker"/>
作为我如何使用 View 绑定(bind)编写此类的示例 - 也许它有帮助!无论如何，它应该更容易使用:
// subclass FrameLayout instead - you're inflating a layout and putting it -inside-
// your custom view, so a FrameLayout (which is meant to hold a single view) is better
// and safer than a ConstraintLayout (which you're not providing constraints for -
// it could break at some point, or act weird)
// I've removed the View.OnClickListener interface because I'm setting the listeners
// another way
class StickerView @JvmOverloads constructor(
context: Context,
attributeSet: AttributeSet?=null,
defStyle:Int = 0
) : FrameLayout(context,attributeSet,defStyle) {
// this inflates your layout and adds it to the view - job done!
private val binding =
ItemStickerBinding.inflate(LayoutInflater.from(context),this,true)
// If you need to refer to a view you've bound, you usually do it through
// the binding object - so "binding.appCompatButton0" etc, and there are ways
// to avoid saying "binding" all the time (see the init block below).
// But if you really want aliases, you could do it this way:
val btn0: ImageButton get() = binding.appCompatButton
init {
// this lets you avoid saying binding.this, binding.that - it can look neater
with(binding) {
// set a single click listener on multiple views
listOf(
appCompatButton, appCompatButton1, appCompatButton2,
appCompatButton3, appCompatButton4, appCompatButton5, appCompatButton6
).forEach { button ->
// call our onClick function with the clicked view
button.setOnClickListener { view -> onClick(view)}
// or setOnClickListener(::onClick)
}
// or you could set each button's action here, like this
appCompatButton1.setOnClickListener { doThing() }
appCompatButton2.setOnClickListener { doSomethingElse() }
}
}
// handle all your button clicks in a function if you want -
// v doesn't need to be nullable
private fun onClick(v: View) {
// because you're using view binding, you have references to all the views -
// so you don't need to use IDs at all
when (v) {
binding.appCompatButton -> { doThing() }
}
}
就个人而言，如果您希望将按钮命名为 btn0 等，我会将它们的 ID 从 appCompatButton 重命名为 btn0 - 这样您可以将它们称为 binding.btn0，如果您喜欢这样想的话!为他们提供您想使用的名称。
希望对您有所帮助!
关于android - 我的自定义 View 没有显示，我应该如何修复它？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/72330901/