当与 ViewBinding 结合使用时,我无法将编程按钮与 ConstraintSet 一起显示。它不会崩溃,按钮只是没有出现。我不知道为什么。打印语句显示 btn 位于 0,0 且高度和宽度为零。在 ViewBinding 之前,我能够使用 ConstraintSet 创建和定位按钮等,所以我能得到的任何帮助来解决这个问题都会很棒。
<?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:id="@+id/topView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/teal_200"
tools:context=".MainActivity"/>
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Button
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import com.randrdevelop.viewbinding.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// setContentView(R.layout.activity_main)
binding = ActivityMainBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
displayCustomBtn1()
// displayCustomBtn2()
}
private fun displayCustomBtn1() {
val btn = Button(this)
val set = ConstraintSet()
val layout: ConstraintLayout = binding.topView
btn.text = "Programmed Button 1"
binding.topView.addView(btn)
btn.id = View.generateViewId()
set.clone(layout)
set.centerHorizontally(btn.id, layout.id)
set.centerVertically(btn.id, layout.id)
set.applyTo(layout)
var array = intArrayOf(-1, -1)
btn.getLocationOnScreen(array)
println("Note height ${btn.height}")
println("Note width ${btn.width}")
println("Note Location ${array[0]} ${array[1]}")
}
private fun displayCustomBtn2() {
// no constraint set. This works.
val btn = Button(this)
btn.text = "Programmed Button 2"
binding.topView.addView(btn)
}
}