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）：

 

res/layout/main.xml：

 

 

<?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：

 

 

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：

 

 

 

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;
	}
}

 

 

消息类：

 

 

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）：

 

 

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());
        	}
        }
    } 
}

 

 

 

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：

 

 

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() {
			@Override
			public void onClick(View v) {
				facade.sendNotification(SetTextCommand.NAME, "button1, onClick");
			}
        });
    }
}

 

 

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：

 

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。

 

所以，我用这种方式传递EditText引用。

 

    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);
    }

 

 

而非在注册时传入：

 

 

//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());
    }