ADF_218：ADF Mobile 11.1.2.4 Samples 介绍（4）：JavaDemo

开发运行环境：JDeveloper 11.1.2.4 + Android SDK r21.1

JavaDemo演示了如何在UI与Java beans之间建立联系，并且还演示了如何在Java中调用EL bindings。

知识点：

1. 如何从一个Feature到另一个Feature

（1）页面代码

<amx:commandButton id="commandLink1" text="Invoke Handler"

                       actionListener="#{pageFlowScope.DemoBean.ActionHandler}"/>

（2）Java代码

    public void ActionHandler(ActionEvent actionEvent) {

        AdfmfContainerUtilities.gotoFeature("Success");

    }

说明：

（1）"Success"是另个Feature的id值，并且设置为隐藏。

（2）Features是否可见，是设置在adfmf-application.xml中的：

2. 如何使用ValueChangeListener

（1）页面代码

<amx:selectBooleanSwitch id="selectBooleanSwitch1" value="#{pageFlowScope.DemoBean.navBarStatus}"

                           label="Navigation Bar" offLabel="Off" onLabel="On"

                           valueChangeListener="#{pageFlowScope.DemoBean.ValueHandler}"/>

                           

（2）Java代码

    public void ValueHandler(ValueChangeEvent valueChangeEvent) {

        String showNav = (String)valueChangeEvent.getNewValue().toString();

        if(showNav.equals("true") ) {

            AdfmfContainerUtilities.showNavigationBar();

        }

        else {

            AdfmfContainerUtilities.hideNavigationBar();

        }

    }

3. 如何在Java中使用EL

（1）页面代码

<amx:commandButton text="Value #{pageFlowScope.button1}"

id="commandButton1" actionListener="#{pageFlowScope.DemoBean.ValueExprHandler}"/>

<amx:commandButton actionListener="#{pageFlowScope.DemoBean.MethodExprHandler}" text="Method"

id="commandButton2"/>

（2）Java代码

    public void ValueExprHandler(ActionEvent actionEvent) {

        ValueExpression ve = AdfmfJavaUtilities.getValueExpression("#{pageFlowScope.button1}", String.class);

        String button1 = (String)ve.getValue(AdfmfJavaUtilities.getAdfELContext());

        button1 += "+";

        ve.setValue(AdfmfJavaUtilities.getAdfELContext(), button1);

    }

    public void MethodExprHandler(ActionEvent actionEvent) {

        MethodExpression me = AdfmfJavaUtilities.getMethodExpression("#{bindings.DoMyMethod.execute}", Object.class, new Class[] {}); 

        me.invoke(AdfmfJavaUtilities.getAdfELContext(), new Object[] {});

    }

4. 如何在Java中调用Data Control 暴露的方法
（1）页面代码

<amx:commandButton actionListener="#{bindings.DoMyMethod.execute}" text="Do MyMethod"
                           id="commandButton1"/>

（2）Java代码

    public void MethodExprHandler(ActionEvent actionEvent) {
        MethodExpression me = AdfmfJavaUtilities.getMethodExpression("#{bindings.DoMyMethod.execute}", Object.class, new Class[] {});
        me.invoke(AdfmfJavaUtilities.getAdfELContext(), new Object[] {});
    }


5. 完整的Java Bean 代码：

package mobile;

import javax.el.MethodExpression;

import javax.el.ValueExpression;

import oracle.adfmf.amx.event.ActionEvent;

import oracle.adfmf.amx.event.ValueChangeEvent;

import oracle.adfmf.framework.api.AdfmfContainerUtilities;

import oracle.adfmf.framework.api.AdfmfJavaUtilities;

public class Javademobean {

    public Javademobean() {

    }

    

    private Boolean navBarStatus = Boolean.TRUE;

    public void ActionHandler(ActionEvent actionEvent) {

        AdfmfContainerUtilities.gotoFeature("Success");

    }

    public void ValueHandler(ValueChangeEvent valueChangeEvent) {

        String showNav = (String)valueChangeEvent.getNewValue().toString();

        if(showNav.equals("true") ) {

            AdfmfContainerUtilities.showNavigationBar();

        }

        else {

            AdfmfContainerUtilities.hideNavigationBar();

        }

    }

    public void setNavBarStatus(Boolean navBarStatus) {

        this.navBarStatus = navBarStatus;

    }

    public Boolean getNavBarStatus() {

        return navBarStatus;

    }

    

    public void DoMyMethod() {

        AdfmfContainerUtilities.gotoFeature("Success");

    }

    public void ValueExprHandler(ActionEvent actionEvent) {

        ValueExpression ve = AdfmfJavaUtilities.getValueExpression("#{pageFlowScope.button1}", String.class);

        String button1 = (String)ve.getValue(AdfmfJavaUtilities.getAdfELContext());

        button1 += "+";

        ve.setValue(AdfmfJavaUtilities.getAdfELContext(), button1);

    }

    public void MethodExprHandler(ActionEvent actionEvent) {

        MethodExpression me = AdfmfJavaUtilities.getMethodExpression("#{bindings.DoMyMethod.execute}", Object.class, new Class[] {}); 

        me.invoke(AdfmfJavaUtilities.getAdfELContext(), new Object[] {});

    }

}