想在Android上用一下PureMVC，谁知结果……
我想用PureMVC for Java实现这样一个Android程序：点击按钮，在两个EditText中显示一些内容和点击总次数。
于是，我开始写了（当然这是我最后修改的正常版）：
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res/layout/main.xml：
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false"> </EditText> <EditText android:id="@+id/editText2" android:textColor="#FF0000" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false"> </EditText> <Button android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Button" /></LinearLayout>?
表面类：
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package com.iteye.weimingtom.pmvc.test;import org.puremvc.java.interfaces.IFacade;import org.puremvc.java.patterns.facade.Facade;import android.widget.EditText;public class MyFacade extends Facade implements IFacade { public MyFacade() { this.registerCommand(SetTextCommand.NAME, new SetTextCommand()); this.registerMediator(new TextMediator()); this.registerMediator(new SimpleTextMediator()); this.registerProxy(new MyProxy()); } public void setupReceivers(EditText editText1, EditText editText2) { ((TextMediator) this.retrieveMediator(TextMediator.NAME)).setEditText(editText1); ((SimpleTextMediator) this.retrieveMediator(SimpleTextMediator.NAME)).setEditText(editText2); }}?代理数据（共享数据）类：
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package com.iteye.weimingtom.pmvc.test;import org.puremvc.java.interfaces.IProxy;import org.puremvc.java.patterns.proxy.Proxy;public class MyProxy extends Proxy implements IProxy {public static final String NAME = "MyProxy";public MyProxy() {super(NAME, null);}public int clickNum = 0;public int getClickNum() {return clickNum;}public void setClickNum(int clickNum) {this.clickNum = clickNum;}}?
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消息类：
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package com.iteye.weimingtom.pmvc.test;import org.puremvc.java.interfaces.ICommand;import org.puremvc.java.interfaces.INotification;import org.puremvc.java.patterns.command.SimpleCommand;public class SetTextCommand extends SimpleCommand implements ICommand {public static final String NAME = "SET_TEXT_COMMAND"; @Override public void execute(INotification n) { MyProxy proxy = (MyProxy)this.facade.retrieveProxy(MyProxy.NAME); proxy.setClickNum(proxy.getClickNum() + 1); }}?中介类（有两个）：
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package com.iteye.weimingtom.pmvc.test;import org.puremvc.java.interfaces.IMediator;import org.puremvc.java.interfaces.INotification;import org.puremvc.java.patterns.mediator.Mediator;import android.widget.EditText;public class TextMediator extends Mediator implements IMediator {public final static String NAME = "TextMediator";private EditText editText;public TextMediator() {super(NAME, null);}public void setEditText(EditText editText) {this.editText = editText;} @Override public String[] listNotificationInterests() { return new String[]{ SetTextCommand.NAME }; } @Override public void handleNotification(INotification n) { if (SetTextCommand.NAME.equals(n.getName())) { if (this.editText != null) { this.editText.setText( "name:" + n.getName() + "\n" + "body:" + n.getBody() + "\n" + "proxy data: clickNum = " + ((MyProxy)this.facade.retrieveProxy(MyProxy.NAME)).getClickNum()); } } } }??
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package com.iteye.weimingtom.pmvc.test;import org.puremvc.java.interfaces.IMediator;import org.puremvc.java.interfaces.INotification;import org.puremvc.java.patterns.mediator.Mediator;import android.widget.EditText;public class SimpleTextMediator extends Mediator implements IMediator {public final static String NAME = "SimpleTextMediator";private EditText editText;public SimpleTextMediator() {super(NAME, null);}public void setEditText(EditText editText) {this.editText = editText;} @Override public String[] listNotificationInterests() { return new String[]{ SetTextCommand.NAME }; } @Override public void handleNotification(INotification n) { if (SetTextCommand.NAME.equals(n.getName())) { if (this.editText != null) { this.editText.setText( "clickNum = " + ((MyProxy)this.facade.retrieveProxy(MyProxy.NAME)).getClickNum()); } } } }?对接到界面后：
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package com.iteye.weimingtom.pmvc.test;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class PureMVCTestActivity extends Activity {private MyFacade facade = new MyFacade(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button1 = (Button) this.findViewById(R.id.button1); EditText editText1 = (EditText) this.findViewById(R.id.editText1); EditText editText2 = (EditText) this.findViewById(R.id.editText2); facade.setupReceivers(editText1, editText2); button1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {facade.sendNotification(SetTextCommand.NAME, "button1, onClick");} }); }}?
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最令我不解的是，如果直接把TextView引用传给registerMediator的TextMediator和SimpleTextMediator对象（作为它们的构造函数的参数），那么响应SetTextCommand的中介类所持有的TextView引用可能不是界面上的TextView引用，因为：
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1. 在调试模式下，registerMediator传入的对象引用等于retrieveMediator得到的对象引用。
2. 在直接运行时，registerMediator传入的对象引用不等于retrieveMediator得到的对象引用。
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所以，我用这种方式传递EditText引用。
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public MyFacade() { this.registerCommand(SetTextCommand.NAME, new SetTextCommand()); this.registerMediator(new TextMediator()); this.registerMediator(new SimpleTextMediator()); this.registerProxy(new MyProxy()); } public void setupReceivers(EditText editText1, EditText editText2) { ((TextMediator) this.retrieveMediator(TextMediator.NAME)).setEditText(editText1); ((SimpleTextMediator) this.retrieveMediator(SimpleTextMediator.NAME)).setEditText(editText2); }?
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而非在注册时传入：
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//这样写可能有问题 public MyFacade(EditText editText1, EditText editText2) { this.registerCommand(SetTextCommand.NAME, new SetTextCommand()); this.registerMediator(new TextMediator(editText1)); this.registerMediator(new SimpleTextMediator(editText2)); this.registerProxy(new MyProxy()); }??
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