如何在android 2.2中实现拖放？

我正在尝试开发一个 Android 应用程序，用户应该能够将图像从网格的一个单元格拖动到另一个单元格。为了实现这一点，我需要 Android 3.0 中引入的拖放 API，但我的应用程序应该在 Android 2.2 中运行。那么，有没有办法使用 Touch 事件来实现这一点呢？如果是，请向我提供一些代码片段或任何简要描述它的链接。

嗨，经过很长一段时间，在 android 2.2 中成功进行拖放操作

在这里我给出了我的代码，它可以让你成功。我的主类在这里

 package info.tempDD;

    import android.app.Activity;
    import android.graphics.Rect;
    import android.graphics.drawable.Drawable;
    import android.os.Bundle;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnTouchListener;
    import android.view.ViewGroup;
    import android.view.ViewGroup.LayoutParams;
    import android.view.Window;
    import android.view.WindowManager;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;

   public class TempDDActivity extends Activity implements OnTouchListener {
        /** Called when the activity is first created. */
        private View selected_item = null;
        private int offset_x = 0;
        private int offset_y = 0;
        Boolean touchFlag=false;
        boolean dropFlag=false;
        LayoutParams imageParams;
        ImageView imageDrop,image1,image2;
        int crashX,crashY;
        Drawable dropDrawable,selectDrawable;
        Rect dropRect,selectRect;
        int topy,leftX,rightX,bottomY;

        int dropArray[];    

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            this.requestWindowFeature(Window.FEATURE_NO_TITLE);
            this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
            setContentView(R.layout.main);
            ViewGroup container = (ViewGroup) findViewById(R.id.container);
            imageDrop=(ImageView) findViewById(R.id.ImgDrop);       
            image1=(ImageView) findViewById(R.id.img);      
            image2=(ImageView) findViewById(R.id.img2);
            container.setOnTouchListener(new View.OnTouchListener() 
            {
                public boolean onTouch(View v, MotionEvent event) 
                {
                    if(touchFlag==true)
                    {
                        System.err.println("Display If  Part ::->"+touchFlag);
                        switch (event.getActionMasked()) 
                        {
                        case MotionEvent.ACTION_DOWN :

                             topy=imageDrop.getTop();
                             leftX=imageDrop.getLeft();
                             rightX=imageDrop.getRight();   
                             bottomY=imageDrop.getBottom();
                            System.err.println("Display Top-->"+topy);      
                            System.err.println("Display Left-->"+leftX);
                            System.err.println("Display Right-->"+rightX);
                            System.err.println("Display Bottom-->"+bottomY);                


                            //opRect.
                            break;
                        case MotionEvent.ACTION_MOVE:
                            crashX=(int) event.getX();
                            crashY=(int) event.getY();
                            System.err.println("Display Here X Value-->"+crashX);
                            System.err.println("Display Here Y Value-->"+crashY);

                            int x = (int) event.getX() - offset_x;
                            int y = (int) event.getY() - offset_y;                                          
                            //int w = getWindowManager().getDefaultDisplay().getWidth() - 100;
                            //int h = getWindowManager().getDefaultDisplay().getHeight() - 100;
                            int w = getWindowManager().getDefaultDisplay().getWidth() - 50;
                            int h = getWindowManager().getDefaultDisplay().getHeight() - 10;
                            if (x > w)
                                x = w;
                            if (y > h)
                                y = h;                      
                            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(new ViewGroup.MarginLayoutParams(  RelativeLayout.LayoutParams.WRAP_CONTENT,   RelativeLayout.LayoutParams.WRAP_CONTENT));
                            lp.setMargins(x, y, 0, 0);                  

                            //Drop Image Here                       
                            if(crashX > leftX && crashX < rightX && crashY > topy && crashY < bottomY )                     
                            {                           
                                Drawable temp=selected_item.getBackground();                            
                                imageDrop.setBackgroundDrawable(temp);
                                imageDrop.bringToFront();                           
                                dropFlag=true;
                                selected_item.setVisibility(View.INVISIBLE);
                            }
                            //Drop Image Here                       
                            selected_item.setLayoutParams(lp);
                            break;  
                        case MotionEvent.ACTION_UP:
                            //                      
                            touchFlag=false;
                            if(dropFlag==true)
                            {
                                dropFlag=false;
                            }
                            else
                            {
                                selected_item.setLayoutParams(imageParams);
                            }                       
                            break;
                        default:
                            break;
                        }
                    }else
                    {
                        System.err.println("Display Else Part ::->"+touchFlag);
                    }               
                    return true;
                }
            });

            image1.setOnTouchListener(this);
            image2.setOnTouchListener(this);
        }

        public boolean onTouch(View v, MotionEvent event) 
        {   
            switch (event.getActionMasked()) 
            {
            case MotionEvent.ACTION_DOWN:
                touchFlag=true;
                offset_x = (int) event.getX();
                offset_y = (int) event.getY();
                selected_item = v;
                imageParams=v.getLayoutParams();
                break;
            case MotionEvent.ACTION_UP:
                selected_item=null;
                touchFlag=false;
                break;
            default:
                break;
            }       
            return false;
        }
    }

之后创建一个类并扩展您的主布局，如relativelayout

package info.tempDD;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.RelativeLayout;

public class TouchInterceptor extends RelativeLayout {
    public TouchInterceptor(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {

        return super.onInterceptTouchEvent(ev);
    }

}

和 Main My Xml 文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/ImgDrop"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentTop="true"
        android:layout_centerInParent="true"
        android:layout_marginTop="50dp"
        android:background="#FFFFFF" >
    </ImageView>

    <ImageView
        android:id="@+id/img"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/ic_launcher" >
    </ImageView>

    <ImageView
        android:id="@+id/img2"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:background="@drawable/ic_launcher" >
    </ImageView>

</RelativeLayout>

好吧，现在我很高兴我完成了我的工作，也很高兴，因为我对我的工作感到满意，我希望这会对您有所帮助。 给我方法的链接如下。

• rxwen-博客-东西
• android 拖放基本