问题描述
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:
bar
但是应用程序崩溃了。
另外,dialog.create().getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(getColor(R.color.bluish_grey))
不起作用。只有set ...()方法。
此外,我还尝试在dialog.getButton
之后使用.getButton()
,但是应用程序崩溃并显示以下错误日志。
我的警报对话框不是自定义的,它只是一个系统对话框。因此,是否可以在不使用XML的情况下将警报对话框按钮的颜色设置为自定义颜色?
更新:错误日志:
dialog.show()
更新了2:
我创建警报的代码:
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.access$3600(View.java:886)
at android.view.View$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)
解决方法
您应该在setTextColor
之后添加 show()
;
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))
,
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首先创建警报,然后设置#setOnShowListener,在其中可以更新文本颜色。
,尝试使用自定义对话框, 这是代码段
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()
}