android 浅复制和深复制-Java Generic Deep Copy 篇

深碍√TFBOYSˉ_ 2022-06-16 00:19 408阅读 0赞

关于Java Generic Deep Copy 在java中的应用和注意事项，请参考：[http://blog.csdn.net/yang\_hui1986527/article/details/7039425][http_blog.csdn.net_yang_hui1986527_article_details_7039425]

而关于在android程序中通过clone方法来进行浅复制和深复制，请参考：[http://blog.csdn.net/yang\_hui1986527/article/details/7036818][http_blog.csdn.net_yang_hui1986527_article_details_7036818]

众所周知，android上层使用的是java语言，因此理论上于Java Generic Deep Copy 方法，同样适用于android程序中对象的深度拷贝。但是，上次在一个android的demo中使用试图通过该方法来进行深度拷贝，一直未成功。出错提示如下：

W/ActivityManager(  154): Launch timeout has expired, giving up wake lock!
    W/ActivityManager(  154): Activity idle timeout for HistoryRecord{40540f08 com.clone/.CloneActivity}
    E/dalvikvm( 3080): Could not find class 'javax.print.attribute.standard.PrinterStateReason', referenced from method com.ajexperience.utils.DeepCopyUtil.a
    W/dalvikvm( 3080): VFY: unable to resolve instanceof 97 (Ljavax/print/attribute/standard/PrinterStateReason;) in Lcom/ajexperience/utils/DeepCopyUtil;
    D/dalvikvm( 3080): VFY: replacing opcode 0x20 at 0x011d
    D/dalvikvm( 3080): VFY: dead code 0x011f-0131 in Lcom/ajexperience/utils/DeepCopyUtil;.a (Ljava/lang/Object;Ljava/lang/Object;Lcom/ajexperience/utils/DeepCopyUtil$a;)Ljava/lang/Object;
    W/System.err( 3080): java.lang.RuntimeException: com.ajexperience.utils.DeepCopyException: java.lang.NoSuchFieldException: modifiers
    W/System.err( 3080): 	at com.clone.CloneUtil.getDeepCloneUtil(CloneUtil.java:14)
    W/System.err( 3080): 	at com.clone.CloneUtil.<init>(CloneUtil.java:8)
    W/System.err( 3080): 	at com.clone.CloneView.<init>(CloneView.java:24)
    W/System.err( 3080): 	at com.clone.CloneActivity.onCreate(CloneActivity.java:12)
    W/System.err( 3080): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    W/System.err( 3080): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
    W/System.err( 3080): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
    W/System.err( 3080): 	at android.app.ActivityThread.access$1500(ActivityThread.java:123)
    W/System.err( 3080): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
    W/System.err( 3080): 	at android.os.Handler.dispatchMessage(Handler.java:99)
    W/System.err( 3080): 	at android.os.Looper.loop(Looper.java:130)
    W/System.err( 3080): 	at android.app.ActivityThread.main(ActivityThread.java:3835)
    W/System.err( 3080): 	at java.lang.reflect.Method.invokeNative(Native Method)
    W/System.err( 3080): 	at java.lang.reflect.Method.invoke(Method.java:507)
    W/System.err( 3080): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
    W/System.err( 3080): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
    W/System.err( 3080): 	at dalvik.system.NativeStart.main(Native Method)
    W/System.err( 3080): Caused by: com.ajexperience.utils.DeepCopyException: java.lang.NoSuchFieldException: modifiers
    W/System.err( 3080): 	at com.ajexperience.utils.DeepCopyUtil.<init>(SourceFile:99)
    W/System.err( 3080): 	at com.clone.CloneUtil.getDeepCloneUtil(CloneUtil.java:12)
    W/System.err( 3080): 	... 16 more
    W/System.err( 3080): Caused by: java.lang.NoSuchFieldException: modifiers
    W/System.err( 3080): 	at java.lang.ClassCache.findFieldByName(ClassCache.java:446)
    W/System.err( 3080): 	at java.lang.Class.getDeclaredField(Class.java:666)
    W/System.err( 3080): 	at com.ajexperience.utils.DeepCopyUtil.<init>(SourceFile:95)
    W/System.err( 3080): 	... 17 more
    D/dalvikvm(  424): GC_EXPLICIT freed 5K, 51% free 3666K/7367K, external 0K/0K, paused 95ms
    I/ActivityManager(  154): Displayed com.clone/.CloneActivity: +20s115ms

于是，通过邮件向作者咨询该问题。今天，终于又收到作者的邮件，通知Java Generic Deep Copy 有更新，让我再试试。

下载最新版[DeepCopyUtil-1.5][]，替换以前的库，运行成功。

**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。**

深复制：

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

源程序：

**（点击下载：[http://download.csdn.net/detail/yang\_hui1986527/3971620][http_download.csdn.net_detail_yang_hui1986527_3971620]）**

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;
    	private CloneUtil mCloneUtil = null;
    	
    	public CloneView(Context context) {
    		super(context);
    		mDocument = new Document();
    		mPaint = new Paint();
    		try {
    			mCloneUtil = new CloneUtil();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		initData();
    	}
    
    	public CloneView(Context context, AttributeSet attrs) {
    		super(context, attrs);
    		mDocument = new Document();
    		mPaint = new Paint();
    		try {
    			mCloneUtil = new CloneUtil();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}	
    		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:
    		{
    			if (mCloneUtil != null) {
    				mTextBox2 = (TextBox) mCloneUtil.clone(mTextBox); //深克隆  
    			}
    
    			if(mTextBox2 != null)
    			{
    				mTextBox2.moveBound();
    				mTextBox2.changeData();
    				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{
    	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();
    }

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{
    	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();
    		
    	}
    
    	@Override
    	void changeData() {
            if(mtextpos != null)
            	mtextpos.offset(20, 50);
    	} 
    }

CloneUtil.java

package com.clone;
    
    import com.ajexperience.utils.DeepCopyException;
    import com.ajexperience.utils.DeepCopyUtil;
    
    public class CloneUtil {
    
    	private DeepCopyUtil deepCopyUtil = getDeepCloneUtil();
    
    	private DeepCopyUtil getDeepCloneUtil() {
    		try {
    			return new DeepCopyUtil();
    		} catch (DeepCopyException e) {
    			throw new RuntimeException(e);
    		}
    	}
    
    	public Object clone(Object object) {
    		try {
    			return deepCopyUtil.deepCopy(object);
    		} catch (DeepCopyException e) {
    			throw new RuntimeException(e);
    		}
    	}
    
    }

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![Center][]

[http_blog.csdn.net_yang_hui1986527_article_details_7039425]: http://blog.csdn.net/yang_hui1986527/article/details/7039425
[http_blog.csdn.net_yang_hui1986527_article_details_7036818]: http://blog.csdn.net/yang_hui1986527/article/details/7036818
[DeepCopyUtil-1.5]: http://www.genericdeepcopy.com/wp-content/uploads/2010/08/DeepCopyUtil-1.5.zip
[0_1322882755iqHQ.gif]: http://hi.csdn.net/attachment/201112/3/0_1322882755iqHQ.gif
[0_1322884843e1Qs.gif]: /images/20220616/a453fd8bad314b46a9b8aa8cdf1b1c05.png
[http_download.csdn.net_detail_yang_hui1986527_3971620]: http://download.csdn.net/detail/yang_hui1986527/3971620
[Link 1]: http://lib.csdn.net/base/wechat
[Center]: /images/20220616/4cd33f6ac1c24484b443ab5fb1530a77.png