Fix dialog themes in compiled apps

DatePicker, TimePicker, and Notifier create dialogs that do not have
the appropriate color. This commit adds behavior to the compiler to
output styling information for dialogs so that these components
properly reflect the user's chosen AccentColor.

Change-Id: I770dcdff555b9f40a28c75e435e938e6258ab3c5

appinventor/buildserver/src/com/google/appinventor/buildserver/Compiler.java

@@ -488,6 +488,22 @@ public final class Compiler {
     out.write("<item name=\"colorPrimary\">@color/colorPrimary</item>\n");
     out.write("<item name=\"colorPrimaryDark\">@color/colorPrimaryDark</item>\n");
     out.write("<item name=\"colorAccent\">@color/colorAccent</item>\n");
+    // Handles theme for Notifier
+    out.write("<item name=\"android:dialogTheme\">@style/AIDialog</item>\n");
+    // Handles theme for DatePicker/TimePicker
+    out.write("<item name=\"android:alertDialogTheme\">@style/AIAlertDialog</item>\n");
+    out.write("</style>\n");
+  }
+
+  private static void writeDialogTheme(Writer out, String name, String parent) throws IOException {
+    out.write("<style name=\"");
+    out.write(name);
+    out.write("\" parent=\"");
+    out.write(parent);
+    out.write("\">\n");
+    out.write("<item name=\"colorPrimary\">@color/colorPrimary</item>\n");
+    out.write("<item name=\"colorPrimaryDark\">@color/colorPrimaryDark</item>\n");
+    out.write("<item name=\"colorAccent\">@color/colorAccent</item>\n");
     out.write("</style>\n");
   }
 
@@ -533,6 +549,13 @@ public final class Compiler {
       out.write("<resources>\n");
       if (!parentTheme.startsWith("Classic")) {
         writeTheme(out, "AppTheme", parentTheme);
+        if (parentTheme.contains("Light")) {
+          writeDialogTheme(out, "AIDialog", "Theme.AppCompat.Light.Dialog");
+          writeDialogTheme(out, "AIAlertDialog", "Theme.AppCompat.Light.Dialog.Alert");
+        } else {
+          writeDialogTheme(out, "AIDialog", "Theme.AppCompat.Dialog");
+          writeDialogTheme(out, "AIAlertDialog", "Theme.AppCompat.Dialog.Alert");
+        }
       }
       out.write("<style name=\"TextAppearance.AppCompat.Button\">\n");
       out.write("<item name=\"textAllCaps\">false</item>\n");