如何在android 2.2中实现拖放？

Question

我想开发一个Android应用程序，其中用户应该能够从网格中的一个单元格拖动图像到另一个。为了实现这一点，我需要在Android 3.0中引入的拖放式API，但我的应用程序应该在Android 2.2中运行。那么，有没有一种方法可以使用Touch事件来实现这一点？如果是的话，请给我提供一些代码片段或简要描述它的任何链接。

Answer 1

的TouchEvent：TouchDown的 - > LockItemOnTouchPoint

FollowTouchDirections - > UpdateItemPosition

的TouchEvent：润色 - > LockItemPosition

Answer 2

嗨很长一段时间后获得的成功做拖放在Android 2.2的

在这里，我给我的代码，给你success.My主类是这里

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; 
     } 
    } 

这之后创建一个类，并扩展您的主要布局类似的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); 
    } 

} 

和主我的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> 

确定现在高兴，我做我的工作，也很高兴，因为我对我的工作感到满意，我希望这会对你有所帮助。 和给我的方式链接如下。

• rxwen-blog-stuff
• android-drag-and-drop-basic

Answer 3

DragDropManager.class

package com.example.dragdrop; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.HashSet; 
import java.util.List; 
import java.util.Map; 

import android.annotation.TargetApi; 
import android.app.Activity; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Rect; 
import android.graphics.drawable.BitmapDrawable; 
import android.os.Build; 
import android.view.ActionMode; 
import android.view.ActionMode.Callback; 
import android.view.Gravity; 
import android.view.KeyEvent; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.view.accessibility.AccessibilityEvent; 
import android.widget.ImageView; 
import android.widget.PopupWindow; 

public class DragDropManager 
{ 
    private static DragDropManager instance; 
    private Activity mActivity; 
    private List<View> dropzones; 
    private Map<View, Integer> dropzonestates; 
    private Map<View, DropZoneListener> dropzonelisteners; 
    private PopupWindow popoup; 
    private MotionEvent firstEvent; 
    private Rect rect; 
    private Object item; 

    public static DragDropManager getInstance() 
    { 
     if (instance == null) instance = new DragDropManager(); 
     return instance; 
    } 

    private DragDropManager() 
    { 
    } 

    public void init(Activity a) 
    { 
     mActivity = a; 
     dropzones = new ArrayList<View>(); 
     dropzonelisteners = new HashMap<View, DropZoneListener>(); 
     dropzonestates = new HashMap<View, Integer>(); 
     rect = new Rect(); 
    } 

    public void addDropZone(View zone, DropZoneListener zonelistener) 
    { 
     dropzones.add(zone); 
     dropzonelisteners.put(zone, zonelistener); 
     dropzonestates.put(zone, 0); 
    } 

    public void clearZones() 
    { 
     dropzones.clear(); 
     dropzonelisteners.clear(); 
     dropzonestates.clear(); 
    } 

    public void clearZone(View zone) 
    { 
     dropzones.remove(zone); 
     dropzonelisteners.remove(zone); 
     dropzonestates.remove(zone); 
    } 

    private void checkDropZones(MotionEvent event) 
    { 
     boolean isOver; 
     HashSet<DropZoneListener> listeners = new HashSet<DropZoneListener>(dropzonelisteners.values()); 

     for (View zone : dropzones) 
     { 
      int[] location = new int[2]; 
      zone.getLocationInWindow(location); 
      zone.getDrawingRect(rect); 
      rect.offset(location[0], location[1]); 
      isOver = rect.contains((int) event.getRawX(), (int) event.getRawY()); 

      switch (dropzonestates.get(zone)) 
      { 
       case 0: 
        if (isOver) 
        { 
         for(DropZoneListener listener:listeners) 
         { 
          listener.OnDragZoneEntered(zone, item); 
         } 
         dropzonestates.put(zone, 1); 
        } 

        break; 
       case 1: 
        if (!isOver) 
        { 
         for(DropZoneListener listener:listeners) 
         { 
          listener.OnDragZoneLeft(zone, item);  
         } 
         dropzonestates.put(zone, 0); 
        } 
        else if (isOver && event.getAction()==MotionEvent.ACTION_UP) 
        { 
         for(DropZoneListener listener:listeners) 
         { 
          listener.OnDropped(zone, item); 
         } 
         dropzonestates.put(zone, 0); 
        } 
        break; 
      } 
     } 
    } 

    public void startDragging(final View dragView, Object item) 
    { 
     this.item = item; 
     // Copy view Bitmap (Clone Object visual) 
     ImageView view = new ImageView(mActivity); 
     view.measure(dragView.getWidth(), dragView.getHeight()); 

     Bitmap returnedBitmap = Bitmap.createBitmap(dragView.getWidth(), dragView.getHeight(),Bitmap.Config.ARGB_8888); 
     Canvas canvas = new Canvas(returnedBitmap); 
     dragView.draw(canvas); 

     view.setBackgroundDrawable(new BitmapDrawable(dragView.getResources(), returnedBitmap)); 

     // Set up Window 
     popoup = new PopupWindow(view, dragView.getWidth(), dragView.getHeight()); 
     popoup.setWindowLayoutMode(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 

     // set window at position 
     int[] location = new int[2]; 
     dragView.getLocationInWindow(location); 
     popoup.showAtLocation(mActivity.getWindow().getDecorView(), Gravity.NO_GRAVITY, location[0], location[1]); 
     // Switch call Backs 
     callbackDefault = mActivity.getWindow().getCallback(); 
     mActivity.getWindow().setCallback(callback); 
    } 

    private android.view.Window.Callback callbackDefault; 

    private android.view.Window.Callback callback = new android.view.Window.Callback() 
    { 

     @Override 
     public boolean dispatchGenericMotionEvent(MotionEvent event) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean dispatchKeyEvent(KeyEvent event) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean dispatchKeyShortcutEvent(KeyEvent event) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean dispatchTouchEvent(MotionEvent event) 
     { 
      checkDropZones(event); 

      if (event.getAction() == MotionEvent.ACTION_DOWN) 
      { 
       // popoup.update((int)event.getRawX(), (int)event.getRawY(), -1, 
       // -1); 
      } 

      if (event.getAction() == MotionEvent.ACTION_MOVE) 
      { 
       if (firstEvent == null) firstEvent = MotionEvent.obtain(event); 

       // Log.v("EVENT","X:"+event.getRawX() + " _X:" + location[0] + 
       // " __X:" + firstEvent.getRawX()); 
       // Log.v("EVENT","Y:"+event.getRawY() + " _Y:" + location[1] + 
       // " __Y:" + firstEvent.getRawY()); 

       float pos_x = event.getRawX() + (-popoup.getWidth()/2); 
       float pos_y = event.getRawY() + (-popoup.getHeight()/2); 

       popoup.update((int) pos_x, (int) pos_y, -1, -1); 

      } 

      if (event.getAction() == MotionEvent.ACTION_UP) 
      { 
       popoup.dismiss(); 
       mActivity.getWindow().setCallback(callbackDefault); 
      } 

      return false; 
     } 

     @Override 
     public boolean dispatchTrackballEvent(MotionEvent event) 
     { 
      return false; 
     } 

     @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
     @Override 
     public void onActionModeFinished(ActionMode mode) 
     { 
      // TODO Auto-generated method stub 

     } 

     @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
     @Override 
     public void onActionModeStarted(ActionMode mode) 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onAttachedToWindow() 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onContentChanged() 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public boolean onCreatePanelMenu(int featureId, Menu menu) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public View onCreatePanelView(int featureId) 
     { 
      // TODO Auto-generated method stub 
      return null; 
     } 

     @Override 
     public void onDetachedFromWindow() 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public boolean onMenuItemSelected(int featureId, MenuItem item) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean onMenuOpened(int featureId, Menu menu) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public void onPanelClosed(int featureId, Menu menu) 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public boolean onPreparePanel(int featureId, View view, Menu menu) 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public boolean onSearchRequested() 
     { 
      // TODO Auto-generated method stub 
      return false; 
     } 

     @Override 
     public void onWindowAttributesChanged(android.view.WindowManager.LayoutParams attrs) 
     { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void onWindowFocusChanged(boolean hasFocus) 
     { 
      // TODO Auto-generated method stub 

     } 

     @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
     @Override 
     public ActionMode onWindowStartingActionMode(Callback callback) 
     { 
      // TODO Auto-generated method stub 
      return null; 
     } 

    }; 

    public interface DropZoneListener 
    { 

     void OnDragZoneEntered(View zone, Object item); 

     void OnDragZoneLeft(View zone, Object item); 

     void OnDropped(View zone, Object item); 

    } 
} 

---

MainActivity.class

package com.example.dragdrop; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnLongClickListener; 
import android.view.View.OnTouchListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

import com.example.dragdrop.DragDropManager.DropZoneListener; 

public class MainActivity extends Activity implements OnLongClickListener, OnTouchListener 
{ 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     DragDropManager.getInstance().init(this); 

     Button b1 = (Button) findViewById(R.id.button1); 
     Button b2 = (Button) findViewById(R.id.button2); 
     Button b3 = (Button) findViewById(R.id.button3); 

     EditText et1 = (EditText) findViewById(R.id.editText1); 
     TextView tv1 = (TextView) findViewById(R.id.textView1); 

     Button b4 = (Button) findViewById(R.id.button4); 
     Button b5 = (Button) findViewById(R.id.button5); 
     Button b6 = (Button) findViewById(R.id.button6); 

     b1.setOnTouchListener(this); 
     b2.setOnLongClickListener(this); 
     b3.setOnTouchListener(this); 

     et1.setOnTouchListener(this); 
     tv1.setOnTouchListener(this); 

     DragDropManager.getInstance().addDropZone(b4, dropZoneListener1); 
     DragDropManager.getInstance().addDropZone(b5, dropZoneListener1); 
     DragDropManager.getInstance().addDropZone(b6, dropZoneListener1); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) 
    { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 

    DropZoneListener dropZoneListener1 = new DropZoneListener() 
    { 

     @Override 
     public void OnDropped(View zone, Object item) 
     { 
      Log.v("ddddd","drop time"); 
      switch(zone.getId()) 
      { 
       case R.id.button4: 
        if (item instanceof String) 
         ((Button)zone).setText("DROP ITEM OK"); 
        else  
         ((Button)zone).setText("DROP ITEM ERR"); 

        break; 
       case R.id.button5: 
        ((Button)zone).setText("DROP"); 
        break; 
       case R.id.button6: 
        if (item instanceof Integer) 
         ((Button)zone).setText("DROP ITEM OK"); 
        else  
         ((Button)zone).setText("DROP ITEM ERR"); 
        break; 
      } 

     } 

     @Override 
     public void OnDragZoneLeft(View zone, Object item) 
     { 

      switch(zone.getId()) 
      { 
       case R.id.button4: 
        ((Button)zone).setText("LEFT"); 
        break; 
       case R.id.button5: 
        ((Button)zone).setText("LEFT"); 
        break; 
       case R.id.button6: 
        ((Button)zone).setText("LEFT"); 
        break; 
      } 
     } 

     @Override 
     public void OnDragZoneEntered(View zone, Object item) 
     { 
      switch(zone.getId()) 
      { 
       case R.id.button4: 
        if (item instanceof String) 
         ((Button)zone).setText("ENTER ITEM OK"); 
        else  
         ((Button)zone).setText("ENTER ITEM ERR"); 
        break; 
       case R.id.button5: 
        ((Button)zone).setText("ENTER"); 
        break; 
       case R.id.button6: 
        if (item instanceof Integer) 
         ((Button)zone).setText("ENTER ITEM OK"); 
        else  
         ((Button)zone).setText("ENTER ITEM ERR"); 
        break; 
      } 
     } 
    }; 

    @Override 
    public boolean onLongClick(View v) 
    { 
     DragDropManager.getInstance().startDragging(v, 0); 
     return false; 
    } 

    @Override 
    public boolean onTouch(View v, MotionEvent event) 
    { 
     DragDropManager.getInstance().startDragging(v, "String"); 
     return false; 
    } 

} 

---

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".MainActivity" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginLeft="14dp" 
     android:text="Click" /> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_alignLeft="@+id/button1" 
     android:layout_below="@+id/button1" 
     android:layout_marginTop="29dp" 
     android:text="Long" /> 

    <Button 
     android:id="@+id/button3" 
     android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_alignLeft="@+id/button2" 
     android:layout_below="@+id/button2" 
     android:layout_marginTop="16dp" 
     android:text="Click" /> 

    <Button 
     android:id="@+id/button6" 
     android:layout_width="200dp" 
     android:layout_height="200dp" 
     android:layout_alignTop="@+id/button3" 
     android:layout_marginLeft="39dp" 
     android:layout_toRightOf="@+id/button3" 
     android:text="Drop3" /> 

    <Button 
     android:id="@+id/button5" 
     android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_alignLeft="@+id/button4" 
     android:layout_centerVertical="true" 
     android:text="Drop2" /> 

    <Button 
     android:id="@+id/button4" 
     android:layout_width="100dp" 
     android:layout_height="100dp" 
     android:layout_above="@+id/button5" 
     android:layout_alignParentRight="true" 
     android:layout_marginBottom="35dp" 
     android:layout_marginRight="20dp" 
     android:text="Drop1" /> 

    <EditText 
     android:id="@+id/editText1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/button3" 
     android:layout_below="@+id/button3" 
     android:layout_marginTop="17dp" 
     android:ems="10" > 

     <requestFocus /> 
    </EditText> 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBottom="@+id/button6" 
     android:layout_alignParentLeft="true" 
     android:text="Large Text" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 

</RelativeLayout> 

---

我从MobileAnarchyWidget一些灵感，但我提高了一些东西。

正如你可以看到我使用PopupWindow创建dragEfect甚至我会克隆视觉部分从拖动对象。另外我不必使用布局的任何部分。简单地把DragDropManager.class放到你的项目中。不需要改变。没有额外的资源。如果一个区域全部/部分覆盖另一个区域，则可以一次击中更多区域。您可以拖动至少查看任何内容。我在“活动”窗口上切换回调，因此当您拖动其他东西时无法访问事件。在这个解决方案中，你永远不会失去Draggable的焦点，并且当你从屏幕上拾起手指时，DragDrop会自动结束（回调的活动恢复控制）。

我没有时间给你看所有的组合使用。但正如你所看到的那样，有一个DropZoneListener。您可以使用更多但记住所有监听器都被调用并且全部更改拖动状态被发送给每个监听器。

例如： Dropzones D1，D2; 听众L1，L2;

如果D1或D2改变 L1（DX）和L2（DX）

如果D1和D2改变 L1（D1，D2）和L2（D1，D2）

但它是良好因为你知道它是否放在其他地方。我忘了DragItem是Object，所以当你放弃时，你必须解析对象的类型。但是这也很好，因为当你使用片段时，你永远不知道可以拖动哪种数据。

在我的解决方案中，我检查对象类型级别。如果对象不被dragzone支持，那么你会知道。

Answer 4

view.setOnTouchListener（新View.OnTouchListener（）{

 public boolean onTouch(View v, MotionEvent me) { 


      if (me.getAction() == MotionEvent.ACTION_MOVE) { 


       v.setX(me.getRawX() - (v.getWidth()/2)); 
       v.setY(me.getRawY() - (float)(v.getHeight()* 1.5/2)); 

      } 

      return true; 
     } 
    } 

）;