我在 Kotlin 中使用带有搜索栏的 alertDialog 框。搜索栏有效，但我无法更新 textView

Question

**我正在尝试通过搜索栏使用警报对话框。搜索栏有效，但我无法更新 textView - (tvPlayers)。最初我只使用了一个 editText 框，它可以工作，但如果我可以使用搜索栏就更好了。

一旦选择了正按钮，变量 numberOfPlayers 就会存储搜索栏进度，但是当搜索栏拇指移动时，我无法跟踪位置。

我在 Android Studio 3.1 中使用 Kotlin 和 viewBinding

edit_textnumberplayers

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="match_parent"
    android:orientation="vertical">


    <TextView
        android:id="@+id/tvPlayers"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="16dp"
        android:gravity="center"
        android:text="0"
        android:textSize="16sp" />

    <SeekBar
        android:id="@+id/etNumberOfPlayers"
        style="@android:style/Widget.DeviceDefault.SeekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="16dp"
        android:max="10"
        android:min="1"
        android:progress="1"
        android:progressTint="#0710B8"
        android:thumb="@drawable/ic_baseline_person_add_alt_1_24" />


    <!--<EditText
        android:id="@+id/etNumberOfPlayers"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="16dp"
        android:hint="Select number of players"
        android:inputType="number"
        android:textSize="16sp" />-->


</LinearLayout>

initialSetupScreen.kt

    private fun chooseNumberOfPlayers() {
        val builder = AlertDialog.Builder(this)
        val inflater = layoutInflater
        val dialogLayout = inflater.inflate(R.layout.edit_text_number_players, null)
        val seekBar = dialogLayout.findViewById<SeekBar>(R.id.etNumberOfPlayers)

        with(builder) {
            setTitle("How many players do you need")

            binding2.tvPlayers.text = seekBar.progress.toString()

            setPositiveButton("OK") { dialog, which ->
                numberOfPlayers = seekBar.progress
                // Show the correct number of enter name boxes.
                showPlayerNameTextBoxes()
            }

            setNegativeButton("Cancel") { dialog, which ->
                Log.d("Main", "Negative button clicked")
                hidePlayerNameTextBoxes()
                finish() // Return to MainMenu screen.
            }
            setView(dialogLayout)
            show()
        }
    }

Answer 1

当 Seekbar 的值发生变化时，您应该更新 textView。
例如：

with(builder) {
    setTitle("How many players do you need")

    seekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
        override fun onProgressChanged(seek, progress, fromUser) {
          binding2.tvPlayers.text = seekBar.progress.toString()
        }
  
        override fun onStartTrackingTouch(seek) {}
        override fun onStopTrackingTouch(seek) {}
    })

    setPositiveButton("OK") { dialog, which ->
        numberOfPlayers = seekBar.progress
        // Show the correct number of enter name boxes.
        showPlayerNameTextBoxes()
    }
    setNegativeButton("Cancel") { dialog, which ->
        Log.d("Main", "Negative button clicked")
        hidePlayerNameTextBoxes()
        finish() // Return to MainMenu screen.
    }
    setView(dialogLayout)
    show()
}