[Android] Implement native input dialog support

platform/android/java/lib/res/values/dimens.xml

@@ -1,4 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 	<dimen name="text_edit_height">48dp</dimen>
+	<dimen name="input_dialog_padding_horizontal">10dp</dimen>
+	<dimen name="input_dialog_padding_vertical">5dp</dimen>
 </resources>

platform/android/java/lib/res/values/strings.xml

@@ -55,4 +55,7 @@
     <string name="kilobytes_per_second">%1$s KB/s</string>
     <string name="time_remaining">Time remaining: %1$s</string>
     <string name="time_remaining_notification">%1$s left</string>
+
+	<!-- Labels for the dialog action buttons -->
+	<string name="dialog_ok">OK</string>
 </resources>

platform/android/java/lib/src/org/godotengine/godot/Godot.kt

@@ -44,6 +44,7 @@ import android.os.*
 import android.util.Log
 import android.util.TypedValue
 import android.view.*
+import android.widget.EditText
 import android.widget.FrameLayout
 import androidx.annotation.Keep
 import androidx.annotation.StringRes
@@ -81,6 +82,7 @@ import java.util.*
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.atomic.AtomicReference
 
+
 /**
  * Core component used to interface with the native layer of the engine.
  *
@@ -772,7 +774,7 @@ class Godot(private val context: Context) {
 			val builder = AlertDialog.Builder(activity)
 			builder.setMessage(message).setTitle(title)
 			builder.setPositiveButton(
-				"OK"
+				R.string.dialog_ok
 			) { dialog: DialogInterface, id: Int ->
 				okCallback?.run()
 				dialog.cancel()
@@ -876,6 +878,31 @@ class Godot(private val context: Context) {
 		mClipboard.setPrimaryClip(clip)
 	}
 
+	/**
+	 * Popup a dialog to input text.
+	 */
+	@Keep
+	private fun showInputDialog(title: String, message: String, existingText: String) {
+		val activity: Activity = getActivity() ?: return
+		val inputField = EditText(activity)
+		val paddingHorizontal = activity.resources.getDimensionPixelSize(R.dimen.input_dialog_padding_horizontal)
+		val paddingVertical = activity.resources.getDimensionPixelSize(R.dimen.input_dialog_padding_vertical)
+		inputField.setPadding(paddingHorizontal, paddingVertical, paddingHorizontal, paddingVertical)
+		inputField.setText(existingText)
+		runOnUiThread {
+			val builder = AlertDialog.Builder(activity)
+			builder.setMessage(message).setTitle(title).setView(inputField)
+			builder.setPositiveButton(R.string.dialog_ok) {
+				dialog: DialogInterface, id: Int ->
+				GodotLib.inputDialogCallback(inputField.text.toString())
+				dialog.dismiss()
+			}
+			val dialog = builder.create()
+			dialog.show()
+		}
+	}
+
+
 	/**
 	 * Destroys the Godot Engine and kill the process it's running in.
 	 */

platform/android/java/lib/src/org/godotengine/godot/GodotLib.java

@@ -224,6 +224,11 @@ public class GodotLib {
 	 */
 	public static native void onNightModeChanged();
 
+	/**
+	 * Invoked on the input dialog submitted.
+	 */
+	public static native void inputDialogCallback(String p_text);
+
 	/**
 	 * Invoked on the GL thread to configure the height of the virtual keyboard.
 	 */