Add a neutral button to androidx EditTextPrefence / DialogPreference - androidx

Question

I have been using my own preference class derived from EditTextPreference to include a neutral button (so that the user can select a default value).
I did this by overriding onPrepareDialogBuilder (from searching stackoverflow of course.
)
override fun onPrepareDialogBuilder(builder: AlertDialog.Builder?) { //So can set have a button to set the default value
super.onPrepareDialogBuilder(builder)
builder?.setNeutralButton("Default") { dialogInterface: DialogInterface, i: Int ->
text = sharedPreferences.getString(dftKey, "")
}
}
However, this method does not seem possible with the androidx EditTextPreference.
Any suggestions on how to add a neutral button to androidx's EditTextPreference would be appreciated.

Answer 1

Having set up my settings activity as per
https://developer.android.com/guide/topics/ui/settings
I have found that I can add the PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback
interface to the AppCompatActivity and override onPreferenceDisplayDialog to show my own dialog.
Edit 15/1/23
Someone wanted to know more about fun myPrefDialog, so I have added some more code. Hope it helps. It makes it rather lengthy and not "completely complete"
class MySettingsActivity: AppCompatActivity(), PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
supportFragmentManager
.beginTransaction()
.replace(android.R.id.content, MyPreferenceFragment())
.commit()
}
override fun onPreferenceDisplayDialog(caller: PreferenceFragmentCompat, pref: Preference?): Boolean {
var handeld = false
if(pref is MyEditTextPreference) {
myPrefDialog(caller, pref)
handled = true
}
return handled
}
}
open class TlEditTextPreference: EditTextPreference {
constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
constructor(context: Context) : super(context)
protected var dlgOptions = 0
internal var origTitle = title.toString()
var valueBeforeEdit: String = ""
override fun onAttached() {
super.onAttached()
PrefUtils.chkSetPrefDefault(this)
//These lines are a debug warning
dialogTitle = "Don't use default dialog."
dialogMessage = "Override onPreferenceDisplayDialog in the preference activity\n"
" to call my own dialog"
positiveButtonText = "Hey stupid, read the warning above"
}
override fun setText(text: String?) {
super.setText(text)
updateTitle()
}
fun updateTitle() {
try {
title = "$origTitle [$text]"
} catch (e: Exception) {
e.printStackTrace()
}
}
open fun myPrefDialog(context: Context): Boolean {
valueBeforeEdit = text ?: ""
dlgOptions = dlgOptions or Misc.idoSTART_SELECTED or Misc.idoDONE_KEY
val dft = PrefUtils.chkSetPrefDefault(this)
Misc.inputDlg2(context, title.toString(), "(Default $dft)",valueBeforeEdit, "Cancel", "Default", "OK", dlgOptions)
{ editText, which ->
when(which) {
Misc.BTN_POS -> text = editText.text.toString()
Misc.BTN_NEUTRAL -> text = dft
}
}
return true
}
}
const val idoNONE = 0
const val idoNO_FULLSCREEN = 1
const val idoSTART_SELECTED = 2
const val idoDONE_KEY = 4
const val idoNUMERIC_KEYPAD = 8
const val idoFIRST_LETTER_LOWERCASE = 0x10
const val idoPASSWORD = 0x20
const val idoAll_CAPS = 0x40
class inputDlg2(context: Context, title: String, msg: String, text: String, btnNeg: String?, btnNeutral: String?,
btnPos: String?, options: Int = idoNONE, dialogCallback: (editText: EditText, which: Int) -> Unit){
val inflater = LayoutInflater.from(context)
// val rv = (context as Activity).window.decorView
val rootView: ViewGroup = (context as Activity).findViewById(android.R.id.content) as ViewGroup
val promptView = inflater.inflate(R.layout.input_box, rootView, false)
val db = AlertDialog.Builder(context)
var inputDlgEditText = promptView.findViewById(R.id.edittext) as EditText
val ocListener = DialogInterface.OnClickListener { dialog, which ->
lastInputDlgText = inputDlgEditText.text.toString()
dialogCallback(inputDlgEditText, which)
}
init {
inputDlgEditText.setText(text)
inputDlgEditText.setTextIsSelectable(true)
if (options and idoNUMERIC_KEYPAD != 0) {
// inputDlgEditText.inputType = InputType.TYPE_NUMBER_FLAG_DECIMAL
// inputDlgEditText.setRawInputType(Configuration.KEYBOARD_12KEY)
inputDlgEditText.inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_FLAG_DECIMAL or InputType.TYPE_NUMBER_FLAG_SIGNED
} else
inputDlgEditText.inputType = InputType.TYPE_TEXT_FLAG_CAP_SENTENCES or inputDlgEditText.inputType
if(options and idoPASSWORD != 0)
inputDlgEditText.inputType = InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_PASSWORD
if (options and idoSTART_SELECTED != 0)
inputDlgEditText.setSelectAllOnFocus(true) //So that last current string will be selected and disapear if start typing
if(options and idoFIRST_LETTER_LOWERCASE != 0)
inputDlgEditText.inputType = InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS
if(options and idoAll_CAPS != 0)
inputDlgEditText.inputType = InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_FLAG_CAP_CHARACTERS
if(options and idoPASSWORD != 0)
inputDlgEditText.inputType = InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_PASSWORD
var editorInfoFlags = 0
if (options and idoNO_FULLSCREEN != 0) {
inputDlgEditText.isSingleLine = true //Added in API29
editorInfoFlags = editorInfoFlags or EditorInfo.IME_FLAG_NO_FULLSCREEN //to disable full screen editor
}
if (options and idoDONE_KEY != 0)
editorInfoFlags = editorInfoFlags or EditorInfo.IME_ACTION_DONE
inputDlgEditText.imeOptions = editorInfoFlags
val message = promptView.findViewById(R.id.inputPrompt) as TextView
message.text = msg
db.setView(promptView)
db.setTitle(title)
if (btnPos != null) db.setPositiveButton(btnPos, ocListener)
if (btnNeutral != null) db.setNeutralButton(btnNeutral, ocListener)
if (btnNeg != null) db.setNegativeButton(btnNeg, ocListener)
db.setIcon(android.R.drawable.ic_dialog_alert)
val dlg = db.create()
dlg.window!!.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE) //Show the software keyboard immediately
val wmlp = dlg.window!!.attributes
wmlp.gravity = Gravity.TOP or Gravity.CENTER_HORIZONTAL
wmlp.x = 0 //x position
// wmlp.y = 100; //y position
inputDlgEditText.requestFocus()
dlg.show()
inputDlgEditText.setOnTouchListener { v, event ->
val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
imm.showSoftInput(inputDlgEditText, 0)
false
}
if(options and idoDONE_KEY != 0) { //Callback when the done key pressed
inputDlgEditText.setOnEditorActionListener { textView: TextView?, action: Int, keyEvent: KeyEvent? ->
if (action == EditorInfo.IME_ACTION_DONE) {
dialogCallback(inputDlgEditText, Misc.BTN_POS)
dlg.dismiss()
}
false
}
}
}
}