请参考以下动作：

//添加文本域

Control control = form.addControl(page, "Text Field0", Field.e_TypeTextField, new RectF(50, 600, 90, 640));

control.getField().setValue("3");

// 更新外观

control.getWidget().resetAppearanceStream();

Control control1 = form.addControl(page, "Text Field1", Field.e_TypeTextField, new RectF(100, 600, 140, 640));

control1.getField().setValue("23");

// 更新外观

control1.getWidget().resetAppearanceStream();

Control control2 = form.addControl(page, "Text Field2", Field.e_TypeTextField, new RectF(150, 600, 190, 640));

Field field2 = control2.getField();

JavaScriptAction javascipt_action = new JavaScriptAction(Action.create(form.getDocument(),

Action.e_TypeJavaScript));

javascipt_action.setScript("AFSimple_Calculate(\"SUM\", new Array (\"Text Field0\", \"Text Field1\"));");

AdditionalAction aa = new AdditionalAction(field2);

aa.setAction(AdditionalAction.e_TriggerFieldRecalculateValue, javascipt_action);

// 更新外观

control2.getWidget().resetAppearanceStream();