android 浅复制和深复制-clone篇

分手后的思念是犯贱 2022-06-17 08:59 375阅读 0赞

有关java中的 浅复制和深复制

### ，这里不详细讨论。相关知识请参考以下帖子： ###

### 浅复制和深复制[http://blog.csdn.net/yang\_hui1986527/article/details/7029777][http_blog.csdn.net_yang_hui1986527_article_details_7029777]   浅析Java中的深拷贝与浅拷贝[http://blog.csdn.net/yang\_hui1986527/article/details/7012428][http_blog.csdn.net_yang_hui1986527_article_details_7012428]    ###

android中的 浅复制和深复制，具体可能于java中的有一点不同。下面，我们来探讨下在这个问题。

**主要思路：**

1、创建TextBox，然后根据TextBox复制出一个对象TextBox2（点击屏幕，进行复制）；

2、改变TextBox2的位置，方便观察比较差异。

3、改变TextBox2内部文本的位置。如果是浅复制，那么TextBox2内部文本改变位置的同时，TextBox内部文本的位置会随着改变。否则，如果是深度复制，TextBox内部文本的位置不会改变。

**效果如下：**

**注：请注意文本“test”在文本框内的位置。**

浅复制：

![0_1322882755iqHQ.gif][]                                      ![0_1322882807aa3i.gif][]

深复制：

![0_1322882755iqHQ.gif][]                                           ![0_1322884843e1Qs.gif][]

源程序：

**(点击下载：[http://download.csdn.net/detail/yang\_hui1986527/3874905][http_download.csdn.net_detail_yang_hui1986527_3874905])**

CloneActivity.java

package com.clone;
    
    import android.app.Activity;
    import android.os.Bundle;
    
    public class CloneActivity extends Activity {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            //setContentView(R.layout.main);
            CloneView mCloneView = new CloneView(this);
            setContentView(mCloneView);
        }
    }

CloneView.java

package com.clone;
    
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.PointF;
    import android.util.AttributeSet;
    import android.view.MotionEvent;
    import android.view.View;
    
    public class CloneView extends View {
    	private Document mDocument = null;
    	public Paint mPaint= null;
    	public TextBox mTextBox = null;
    	public TextBox mTextBox2 = null;
    
    	public CloneView(Context context) {
    		super(context);
    		mDocument = new Document();
    		mPaint = new Paint();
    		initData();
    	}
    
    	public CloneView(Context context, AttributeSet attrs) {
    		super(context, attrs);
    		mDocument = new Document();
    		mPaint = new Paint();
    		initData();
    	}
    
    	public CloneView(Context context, AttributeSet attrs, int defStyle) {
    		super(context, attrs, defStyle);
    		mDocument = new Document();
    	}
    
    	public void initData()
    	{
    		PointF textpos = new PointF(30,30);
    		String text = new String("test");
    
    		mTextBox = new TextBox(50, 50, 100, 100, textpos, text);
    
    		mDocument.add(mTextBox);
    	}
    
    	@Override
    	protected void onDraw(Canvas canvas) {
    		super.onDraw(canvas);
    		canvas.drawColor(Color.WHITE);
    		mDocument.draw(canvas, mPaint);
    	}
    
    	@Override
    	public boolean onTouchEvent(MotionEvent event) {
    		switch (event.getAction()) {
    		case MotionEvent.ACTION_DOWN:
    		{
    
    			try {
    				mTextBox2 = (TextBox)mTextBox.clone();
    				mTextBox2.moveBound();
    				mTextBox2.changeData();
    			} catch (CloneNotSupportedException e) {
    				e.printStackTrace();
    			}
    			if(mTextBox2 != null)
    				mDocument.add(mTextBox2);
    		}
    		invalidate();
    		break;
    		case MotionEvent.ACTION_MOVE:
    			break;	
    		case MotionEvent.ACTION_UP:
    			break;
    		default:
    			break;
    		}
    		return super.onTouchEvent(event);
    	}
    
    
    }

Document.java

package com.clone;
    
    import java.util.Vector;
    
    import android.graphics.Canvas;
    import android.graphics.Paint;
    
    public class Document {
    
    	private Vector<Object> objs = null;
    
    	public Document() {
    		objs = new Vector<Object>();
    	}
    
    	public void add(Object obj){
    		objs.add(obj);
    	}
    
    	void draw(Canvas canvas, Paint paint) {
    		canvas.save();
    		
    		for (int i = 0; i < objs.size(); i++) {
    			Object obj = objs.get(i);
    			obj.draw(canvas, paint);
    		}
    		
    		canvas.restore();
    	}
    
    
    }

Object.java

package com.clone;
    
    import android.graphics.Canvas;
    import android.graphics.Paint;
    
    
    
    public abstract class Object implements Cloneable{
    	protected float posx = 0;	
    	protected float posy =0;
    	protected float width = 0;
    	protected float height = 0;
    	
    	public Object() {
    		posx = 0;
    		posy =0;
    		width = 0;
    		height = 0;
    	}
    
    	public Object(float posx,float posy,float width,float height){
    		this.posx = posx;
    		this.posy = posy;
    		this.width = width;
    		this.height = height;		
    	}
    	
    	public void moveBound() {
    		this.posx += 100;
    		this.posy += 100;
    	}
    	
    	abstract  void draw(Canvas canvas,Paint paint);
    	abstract  void changeData();
    
        public Object clone() throws CloneNotSupportedException {  
            return (Object) super.clone();  
        }  
    }

TextBox.java

package com.clone;
    
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Paint.Style;
    import android.graphics.PointF;
    
    public class TextBox extends Object implements Cloneable{
    	private PointF mtextpos = null;
    	private String mtextString = null;
    	
    	public TextBox() {
    		posx = 0;
    		posy =0;
    		width = 0;
    		height = 0;
    		mtextpos = new PointF();
    		mtextString = new String();
    	}
    
    	public TextBox(float posx, float posy, float width, float height,PointF textpos,String text) {
    		this.posx = posx;
    		this.posy = posy;
    		this.width = width;
    		this.height = height;	
    		mtextpos = new PointF(textpos.x,textpos.y);
    		mtextString = new String(text);
    	}
    
    	@Override
    	void draw(Canvas canvas, Paint paint) {
    		canvas.save();
    		paint.setColor(Color.BLUE);
    		paint.setStyle(Style.STROKE);
    		canvas.drawRect(posx, posy, posx+width, posy+height, paint);
    		
    		canvas.translate(posx, posy);
    		paint.setColor(Color.BLACK);
    		paint.setTextSize(20);
    		canvas.drawText(mtextString, mtextpos.x, mtextpos.y, paint);
    		canvas.restore();
    		
    	}
    //	
    //	//浅克隆
    //    public TextBox clone() throws CloneNotSupportedException {  
    //        return (TextBox) super.clone();  
    //    }  
        
    	//深克隆
        public TextBox clone() throws CloneNotSupportedException {  
            TextBox o =  (TextBox) super.clone();  
            
             //对于string，int等基本类型，用上面一句就可以
            //对于复杂类型，例如PointF等还需要手动实现拷贝
            if(mtextpos != null)
            	o.mtextpos = new PointF(mtextpos.x,mtextpos.y);
            
            return o;
        }
    
    	@Override
    	void changeData() {
            if(mtextpos != null)
            	mtextpos.offset(20, 50);
    	} 
    }

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[http_blog.csdn.net_yang_hui1986527_article_details_7029777]: http://blog.csdn.net/yang_hui1986527/article/details/7029777
[http_blog.csdn.net_yang_hui1986527_article_details_7012428]: http://blog.csdn.net/yang_hui1986527/article/details/7012428
[0_1322882755iqHQ.gif]: http://hi.csdn.net/attachment/201112/3/0_1322882755iqHQ.gif
[0_1322882807aa3i.gif]: /images/20220617/fb4e965231d242afb26c15119ad4a8a2.png
[0_1322884843e1Qs.gif]: /images/20220617/fc06c8d547894e08a4e1683f30aa420e.png
[http_download.csdn.net_detail_yang_hui1986527_3874905]: http://download.csdn.net/detail/yang_hui1986527/3874905
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