dialog.getButton() 在 Android Kotlin 中无法访问

Question

我正在尝试将系统警报对话框按钮的颜色更改为自定义颜色。我一直在尝试使用这个：

dialog.create().getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(getColor(R.color.bluish_grey))

但是应用程序崩溃了。此外，dialog.getButton 不起作用。只有 set...() 方法。

此外，我还尝试在 dialog.show() 之后使用 .getButton()，但应用程序崩溃并显示以下错误日志。

我的警告对话框不是自定义的，它只是一个系统对话框。那么，是否可以在不使用 XML 的情况下将警报对话框的按钮颜色设置为自定义颜色？

这就是我想要实现的。

这是我目前拥有的：

更新： 错误日志：

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: no.company.app, PID: 26643
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setTextColor(int)' on a null object reference
        at no.meshtech.demokit.view.activity.MainActivity.showCancelDialog(MainActivity.kt:402)
        at no.meshtech.demokit.view.activity.MainActivity.startUpdate(MainActivity.kt:317)
        at no.meshtech.demokit.view.activity.MainActivity.onClick(MainActivity.kt:67)
        at android.view.View.performClick(View.java:7869)
        at android.widget.TextView.performClick(TextView.java:14958)
        at android.view.View.performClickInternal(View.java:7838)
        at android.view.View.access00(View.java:886)
        at android.view.View$PerformClick.run(View.java:29362)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:237)
        at android.app.ActivityThread.main(ActivityThread.java:8019)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

已更新2：

我创建提醒的代码：

   override fun showCompletedDialog() {
        DfuBaseService.PROGRESS_COMPLETED

        val dialog = AlertDialog.Builder(this)

            .setTitle(getString((R.string.dfu_completed_title)))
            .setMessage(getString(R.string.dfu_completed_message))
            .setPositiveButton(R.string.dfu_completed_ok) { dialog, _ ->
                transaction(listFragment, R.id.cvCentral)
                supportFragmentManager.findFragmentById(R.id.upperContainer)?.let {
                    supportFragmentManager.beginTransaction().remove(it).commit()
                    setNavigationTitle(getString(R.string.title_header_devices))
                }
                upperContainer.visibility = View.GONE

                Handler().postDelayed({
                    onBackPressed()
                    dialog.dismiss()
                }, 400)
            }


        dialog.setCancelable(false)
        dialog.show()
    }

Answer 1

您应该在 show() 之后添加 setTextColor；

    val alertDialog = AlertDialog.Builder(this).create()
    alertDialog.setTitle(getString((R.string.app_name)))
    alertDialog.setMessage(getString(R.string.app_name))
    alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "RESUME"
    ) { dialog, which -> dialog.dismiss() }

    alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "ABORT"
    ) { dialog, which -> dialog.dismiss() }

    alertDialog.show()
    alertDialog.setCancelable(false)
    alertDialog.getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(ContextCompat.getColor(this,R.color.colorPrimary))
    alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(ContextCompat.getColor(this,R.color.colorAccent))

Answer 2

尝试使用自定义对话框，这是代码片段

 private fun showDialog(title: String) {
    val dialog = Dialog(activity)
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
    dialog.setCancelable(false)
    dialog.setContentView(R.layout.custom_layout)
    val body = dialog.findViewById(R.id.body) as TextView
    body.text = title
    val okBtn = dialog.findViewById(R.id.okBtn) as Button
    val noBtn = dialog.findViewById(R.id.noBtn) as TextView
    okBtn.setOnClickListener {
        dialog.dismiss()
    }
    noBtn.setOnClickListener { dialog.dismiss() }
    dialog.show()

}

Answer 3

val dialog = AlertDialog.Builder(this)
    .setTitle("Title")
    .setMessage("Message")
    .setPositiveButton("Positive") { dialog, _ ->
        // Do stuff
    }.setNegativeButton("Negative"){ dialog, _ ->
        // Do stuff
    }.create()

dialog.setCancelable(false)

dialog.setOnShowListener {
    dialog.getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(resources.getColor(R.color.colorPrimaryDark))
}

dialog.show()

您应该使用AlertDialog.Builder#create 先创建警报，然后设置#setOnShowListener，您可以在其中更新文本颜色。

dialog.getButton() 在 Android Kotlin 中无法访问

dialog.getButton() is not reachable in Android Kotlin

android

android-alertdialog

kotlin