--- a/android/DWindows.kt	Mon Apr 26 21:56:37 2021 +0000
+++ b/android/DWindows.kt	Tue Apr 27 00:16:56 2021 +0000
@@ -1,13 +1,15 @@
 package org.dbsoft.dwindows
 
+import android.content.DialogInterface
 import android.content.pm.ActivityInfo
 import android.os.Bundle
+import android.os.Looper
 import android.text.method.PasswordTransformationMethod
-import android.util.Half.toFloat
 import android.util.Log
 import android.view.Gravity
 import android.view.View
 import android.widget.*
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 
 
@@ -76,7 +78,7 @@
         var params: LinearLayout.LayoutParams = LinearLayout.LayoutParams(w, h)
 
         if(item !is LinearLayout && (width != -1 || height != -1)) {
-            item.measure(0,0)
+            item.measure(0, 0)
             if (width > 0) {
                 w = width
             } else if(width == -1) {
@@ -178,6 +180,48 @@
         Log.d(null, text)
     }
 
+    fun messageBox(title: String, body: String, flags: Int): Int
+    {
+        // make a text input dialog and show it
+        var alert = AlertDialog.Builder(this)
+        var retval: Int = 0
+
+        alert.setTitle(title)
+        alert.setMessage(body)
+        if((flags and (1 shl 3)) != 0) {
+            alert.setPositiveButton("Yes", DialogInterface.OnClickListener { _: DialogInterface, _: Int ->
+                retval = 1
+                throw java.lang.RuntimeException()
+            });
+        }
+        if((flags and ((1 shl 1) or (1 shl 2))) != 0) {
+            alert.setNegativeButton("Ok", DialogInterface.OnClickListener { _: DialogInterface, _: Int ->
+                retval = 0
+                throw java.lang.RuntimeException()
+            });
+        }
+        if((flags and ((1 shl 3) or (1 shl 4))) != 0) {
+            alert.setNegativeButton("No", DialogInterface.OnClickListener { _: DialogInterface, _: Int ->
+                retval = 0
+                throw java.lang.RuntimeException()
+            });
+        }
+        if((flags and ((1 shl 2) or (1 shl 4))) != 0) {
+            alert.setNeutralButton("Cancel", DialogInterface.OnClickListener { _: DialogInterface, _: Int ->
+                retval = 2
+                throw java.lang.RuntimeException()
+            });
+        }
+        alert.show();
+
+        // loop till a runtime exception is triggered.
+        try {
+            Looper.loop()
+        } catch (e2: RuntimeException) {
+        }
+        return retval
+    }
+
     /*
      * Native methods that are implemented by the 'dwindows' native library,
      * which is packaged with this application.

--- a/android/dw.cpp	Mon Apr 26 21:56:37 2021 +0000
+++ b/android/dw.cpp	Tue Apr 27 00:16:56 2021 +0000
@@ -592,6 +592,27 @@
  */
 int API dw_messagebox(const char *title, int flags, const char *format, ...)
 {
+    va_list args;
+    char outbuf[1025] = {0};
+    JNIEnv *env;
+
+    va_start(args, format);
+    vsnprintf(outbuf, 1024, format, args);
+    va_end(args);
+
+    if((env = (JNIEnv *)pthread_getspecific(_dw_env_key)))
+    {
+        // Construct a String
+        jstring jstr = env->NewStringUTF(outbuf);
+        jstring jstrtitle = env->NewStringUTF(title);
+        // First get the class that contains the method you need to call
+        jclass clazz = _dw_find_class(env, DW_CLASS_NAME);
+        // Get the method that you want to call
+        jmethodID messageBox = env->GetMethodID(clazz, "messageBox",
+                                                  "(Ljava/lang/String;Ljava/lang/String;I)I");
+        // Call the method on the object
+        return env->CallIntMethod(_dw_obj, messageBox, jstrtitle, jstr, flags);
+    }
     return 0;
 }