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.youkuaiyun.com/source/3142047