initial alert dialogs implementation for Android

ui/dialogs/dialogs.android.ts

@@ -1,15 +1,67 @@
 /**
   * Android specific dialogs functions implementation.
   */
+import promises = require("promises");
+import dialogs = require("ui/dialogs");
+import appmodule = require("application");
 
-export function alert(message: string): void {
-   
+function createAlertDialog(options: dialogs.DialogOptions): android.app.AlertDialog.Builder {
+    var alert = new android.app.AlertDialog.Builder(appmodule.android.currentActivity);
+    alert.setTitle(options.title);
+    alert.setMessage(options.message);
+    return alert;
 }
 
-export function confirm(message: string): void {
-   
+export function alert(arg: any): promises.Promise<any> {
+    var d = promises.defer<any>();
+    try {
+        var options = typeof arg === "string" ? { message: arg, title: "Alert", buttonName: "OK" } : arg
+
+        var alert = createAlertDialog(options);
+        /*
+        alert.setPositiveButton(options.buttonName, new android.content.DialogInterface.OnClickListener({
+            onClick: function (dialog: android.content.DialogInterface, id: number) {
+                dialog.cancel();
+            }
+        }));
+*/
+        alert.show();
+
+    } catch (ex) {
+        d.reject(ex);
+    }
+
+    return d.promise();
 }
 
-export function prompt(text: string, defaultText?: string): void {
-    
+export function confirm(arg: any): promises.Promise<boolean> {
+    var d = promises.defer<boolean>();
+    try {
+        var options = typeof arg === "string" ? { message: arg, title: "Alert", okButtonName: "OK", cancelButtonName: "Cancel" } : arg
+
+        var alert = createAlertDialog(options);
+
+        alert.show();
+
+    } catch (ex) {
+        d.reject(ex);
+    }
+
+    return d.promise();
+}
+
+export function prompt(arg: any): promises.Promise<string> {
+    var d = promises.defer<string>();
+    try {
+        var options = typeof arg === "string" ? { message: arg, title: "Alert", okButtonName: "OK", cancelButtonName: "Cancel" } : arg
+
+        var alert = createAlertDialog(options);
+
+        alert.show();
+
+    } catch (ex) {
+        d.reject(ex);
+    }
+
+    return d.promise();
 }