为launcher添加一个仿Mac的dock(附源码)

之前在网上看到有篇文章：Launcher之Dock细节篇http://news.wangmeng.cn/detailNews/2716-the-article-details-launcher-dock 它实现了一个仿Mac的dock。感觉蛮有意思的，所以就照着仿制了一个。

可以动态的添加快捷方式，默认包含AllApp按钮，图标居中显示。
文章后边附带的源码是基于android2.2自带的launcher2稍作修改而成，使用eclipse调试。

一、首先要在Launcher的setupViews函数里面初始化自己的layout(需增加3个地方)

[java] view plaincopy

    1.        
     
    dockbar=(DockBar)dragLayer.findViewById(R.id.dockbar); 
     
    dockbar.setLauncher(this);  
     
    dockbar.setDragController(dragController);       
     
    2. 
     
    dragController.setDragScoller(workspace); 
     
    dragController.setDragListener(deleteZone); 
     
    dragController.setDockDragListener(dockbar); // hmg25 add for dock 
     
      
     
    setDockDragListener为自定义函数，添加在DragController的startDrag中，具体见源码 
     
    if(mDockListener!=null){    
     
          mDockListener.onDragStart(source, dragInfo, dragAction);  
     
            } 
     
      
     
     
     
    3. 
     
    // The order here is bottom to top. 
     
    dragController.addDropTarget(workspace); 
     
    dragController.addDropTarget(dockbar);    //hmg25 add for dock 
     
    dragController.addDropTarget(deleteZone); 
     
      

 

二、在layout-port的launcher.xml中增加

[xhtml] view plaincopy

    <!--hmg add for dock {  -->  
     
     <com.android.launcher2.DockBar 
     
            android:id="@+id/dockbar" 
     
            android:layout_width="fill_parent" 
     
            android:layout_height="@dimen/button_bar_height" 
     
            android:layout_gravity="bottom|center_horizontal" 
     
            android:background="@drawable/dock_bg" 
     
            launcher:direction="horizontal"> 
     
            <HorizontalScrollView android:id="@+id/dock_scroll_view"  
     
            android:scrollbars="none"  
     
            android:fadingEdge="none"  
     
            android:saveEnabled="false"  
     
            android:layout_width="fill_parent"  
     
            android:layout_height="fill_parent"> 
     
            <LinearLayout android:orientation="horizontal"  
     
            android:id="@+id/dock_item_holder"       
     
            android:saveEnabled="false"  
     
            android:layout_width="fill_parent"  
     
            android:layout_height="fill_parent"> 
     
             <com.android.launcher2.HandleView   //默认将allapp按钮添加进去 
     
                android:id="@+id/all_apps_button" 
     
                android:layout_centerHorizontal="true" 
     
                android:src="@drawable/all_apps_button" 
     
                launcher:direction="horizontal"         
     
                android:layout_width="fill_parent" 
     
                android:layout_height="fill_parent" 
     
                android:focusable="true" 
     
                android:clickable="true" 
     
                /> 
     
            </LinearLayout> 
     
        </HorizontalScrollView> 
     
    </com.android.launcher2.DockBar> 
     
     <!--hmg add for dock  } -->   

 

三、创建自定义的类：

[java] view plaincopy

    public class DockBar extends LinearLayout implements DropTarget, DragSource, 
     
    DragController.DragListener,View.OnLongClickListener { 
     
      
     
    @Override 
     
        public boolean acceptDrop(DragSource source, int x, int y, int xOffset,int yOffset,DragView dragView, Object dragInfo) {                  
     
         //接受什么类型的图标         
     
          Log.i("hmg", "DockBar->acceptDrop"); 
     
         final ItemInfo item = (ItemInfo) dragInfo;        
     
         if (item.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET                 
     
         || item.itemType == LauncherSettings.Favorites.ITEM_TYPE_LIVE_FOLDER                 
     
         || item.itemType == LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER                  
     
         || item.itemType == LauncherSettings.Favorites.ITEM_TYPE_WIDGET_PHOTO_FRAME                 
     
         || item.itemType == LauncherSettings.Favorites.ITEM_TYPE_WIDGET_SEARCH                 
     
         || item.itemType == LauncherSettings.Favorites.ITEM_TYPE_WIDGET_CLOCK) {          
     
         return false;         
     
         }   
     
         return true;  
     
         } 
     
      
     
      
     
      
     
    //拖拽释放时响应下边函数 
     
    @Override 
     
        public void onDrop(DragSource source, int x, int y, int xOffset, 
     
             int yOffset, DragView dragView, Object dragInfo) { 
     
      
     
         int position=0; 
     
         position=getLocation(x); //根据释放时的坐标，获取插入位置 
     
         addItemAt((ItemInfo)dragInfo, position);     
     
        } 
     
    /*
    
         * 传入x坐标，判断新图标的位置，此处仅判断竖屏
    
         */ 
     
        public int getLocation(int x){    
     
                for(int i=0;i<mItemHolder.getChildCount();i++){    
     
                    View iv = mItemHolder.getChildAt(i);            
     
                    int[] position = new int[2]; 
     
                    //获取坐标，如果要适应横屏可以稍作修改，比较Y值 
     
                    iv.getLocationOnScreen(position); 
     
                    //判断释放时新增的图标在原图标的之前还是之后 
     
                     if(x<=(position[0]+(iv.getWidth()/2))){                         
     
                             return i;                       
     
                     }                     
     
                 }     
     
                 return mItemHolder.getChildCount();    
     
             }   
     
      
     
      
     
    private void addItemAt(ItemInfo itemInfo, int position) 
     
        { 
     
         View view=null; 
     
         switch (itemInfo.itemType) { 
     
         case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION: 
     
         case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:      
     
             ShortcutInfo shortcutInfo; 
     
         // 拖拽图标来自于app list 
     
         if(itemInfo.container ==NO_ID&& itemInfo instanceof ApplicationInfo)         
     
         { 
     
             //与来自桌面的图标包含信息不一样，具体看源码 
     
             shortcutInfo= new ShortcutInfo((ApplicationInfo)itemInfo); 
     
         } 
     
         else 
     
         shortcutInfo = (ShortcutInfo)itemInfo; //拖拽图标来自桌面 
     
         //调用Launcher中的CreateDockShortcut生成一个imageView 
     
         view = mLauncher. CreateDockShortcut (shortcutInfo); 
     
          view.setOnLongClickListener(this);   
     
           break; 
     
         case LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER: 
     
             break; 
     
         default: 
     
             throw new IllegalStateException("Unknown item type: " 
     
                 + itemInfo.itemType); 
     
         }    
     
         mItemHolder.addView(view, position);      
     
    } 
     
      
     
    之所以将新建view用Launcher. CreateDockShortcut是想直接使用Launcher中的单击事件。 
     
    View CreateDockShortcut (ShortcutInfo shortcutInfo) 
     
        {  
     
         Context context=getApplicationContext(); 
     
         ImageView imageView =new ImageView(context);     
     
         imageView.setImageBitmap(shortcutInfo.mIcon); 
     
         imageView.setOnClickListener(this); 
     
         imageView.setFocusable(true); 
     
         imageView.setTag(shortcutInfo); 
     
         imageView.setMinimumWidth(100); 
     
         return imageView; 
     
        } 
     
      
     
     在dock上长按，拖拽交换位置或者拖拽出去 
     
    @Override 
     
        public boolean onLongClick(View v) { 
     
         // TODO Auto-generated method stub 
     
          if (mLauncher.isAllAppsVisible()) 
     
             mLauncher.closeAllApps(false); 
     
             mSelectedView = v;         
     
    //开始拖拽 
     
         mDragController.startDrag(v, this, v.getTag(), 
     
             DragController.DRAG_ACTION_MOVE); 
     
          removeSelectedItem(); 
     
             return true; 
     
        } 
     
    private void removeSelectedItem() 
     
        { 
     
          if (mSelectedView == null) 
     
            return; 
     
          mItemHolder.removeView(mSelectedView); 
     
        } 



代码修改了不少地方，具体看代码，修改的地方我都标注啦 ~~欢迎大家指教，相互交流~~

源码地址：http://download.csdn.net/source/3142047