Launcher2分析（二）--res分析

好吧，现在我们来看res目录里的布局文件，布局文件都放在layout*目录里。

本以为launcher的layout都放在layout目录里，由于屏幕放置方式的不同会对桌面造成一定的影响，所以google的android项目组就决定因地制宜。比如当你横着放置屏幕的时候就会使用layout-land目录里的文件来对系统launcher进行布局，竖着屏幕的时候会使用layout-port内的布局文件来对launcher来布局。

横竖屏幕切换之际，会重新进行布局。那我们就以layout-land目录为例来看吧。

layout-land/launcuer.xml

  1 <?xml version="1.0" encoding="utf-8"?>
  2  <!-- Copyright (C) 2007 The Android Open Source Project
  3 
  4      Licensed under the Apache License, Version 2.0 (the "License");
  5      you may not use this file except in compliance with the License.
  6      You may obtain a copy of the License at
  7   
  8           http://www.apache.org/licenses/LICENSE-2.0
  9   
 10      Unless required by applicable law or agreed to in writing, software
 11      distributed under the License is distributed on an "AS IS" BASIS,
 12      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 13      See the License for the specific language governing permissions and
 14      limitations under the License.
 15  -->
 16 
 17 <com.android.launcher2.DragLayer
 18     xmlns:android="http://schemas.android.com/apk/res/android"
 19     xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
 20 
 21     android:id="@+id/drag_layer"
 22     android:layout_width="match_parent"
 23     android:layout_height="match_parent">
 24 
 25     <include layout="@layout/all_apps" />
 26 
 27     <!-- The workspace contains 3 screens of cells -->
 28     <com.android.launcher2.Workspace
 29         android:id="@+id/workspace"
 30         android:layout_width="match_parent"
 31         android:layout_height="match_parent"
 32         android:scrollbars="horizontal"
 33         android:fadeScrollbars="true"
 34         launcher:defaultScreen="2">
 35     <!-- 上面这行可以确定屏幕横放时默认的桌面号 -->
 36         <include android:id="@+id/cell1" layout="@layout/workspace_screen" />
 37         <include android:id="@+id/cell2" layout="@layout/workspace_screen" />
 38         <include android:id="@+id/cell3" layout="@layout/workspace_screen" />
 39         <include android:id="@+id/cell4" layout="@layout/workspace_screen" />
 40         <include android:id="@+id/cell5" layout="@layout/workspace_screen" />
 41     </com.android.launcher2.Workspace>
 42 <!-- 上面这几行描述了几个工作区的屏幕，描述代码为layout-land/workspace_screen
 43 
 44       而模拟器上能看到左右各两个小白点可以控制工作区的移动
 45 
 46 -->
 47 
 48 <!-- 应该对应的是ClippedImageView类-->
 49     <com.android.launcher2.ClippedImageView
 50         android:id="@+id/previous_screen"
 51         android:layout_width="93dip"
 52         android:layout_height="@dimen/button_bar_height"
 53         android:layout_gravity="bottom|left"
 54         android:layout_marginLeft="6dip"
 55 
 56         android:scaleType="center"
 57         android:src="@drawable/home_arrows_left"
 58         
 59         android:onClick="previousScreen"
 60 
 61         launcher:ignoreZone="56dip"
 62 
 63         android:focusable="true"
 64         android:clickable="true" />
 65 <!-- 定义了previousScreen 按钮，即左下脚的白色小点，用来控制移动-->
 66     <com.android.launcher2.ClippedImageView
 67         android:id="@+id/next_screen"
 68         android:layout_width="93dip"
 69         android:layout_height="@dimen/button_bar_height"
 70         android:layout_gravity="bottom|right"
 71         android:layout_marginRight="6dip"
 72 
 73         android:scaleType="center"
 74         android:src="@drawable/home_arrows_right"
 75         
 76         android:onClick="nextScreen"
 77         
 78         launcher:ignoreZone="-56dip"
 79         
 80         android:focusable="true"
 81         android:clickable="true" />
 82 <!-- 底部右边的两个白色小点 -->
 83     <com.android.launcher2.DeleteZone
 84         android:id="@+id/delete_zone"
 85         android:layout_width="@dimen/delete_zone_size"
 86         android:layout_height="@dimen/delete_zone_size"
 87         android:paddingLeft="@dimen/delete_zone_padding"
 88         android:layout_marginBottom="@dimen/half_status_bar_height"
 89         android:layout_gravity="right|center_vertical"
 90 
 91         android:scaleType="center"
 92         android:src="@drawable/delete_zone_selector"
 93         android:visibility="invisible"
 94         launcher:direction="vertical"
 95         />
 96 <!-- 定义Trash放置的位置 右侧，中间平放-->
 97     <RelativeLayout
 98         android:id="@+id/all_apps_button_cluster"
 99         android:layout_height="fill_parent"
100         android:layout_width="@dimen/button_bar_height_portrait"
101         android:layout_gravity="right|center_vertical"
102         android:layout_marginBottom="@dimen/half_status_bar_height"
103         >
104 <!-- 定义右侧 靠近屏幕边缘的三个按钮，中间一个是all-apps
105 
106      之下是phone按钮，之上是浏览器按钮，绑定响应函数
107 
108 -->
109         <com.android.launcher2.HandleView
110             style="@style/HotseatButton"
111             android:id="@+id/all_apps_button"
112             android:layout_centerVertical="true"
113             android:layout_alignParentRight="true"
114 
115             android:src="@drawable/all_apps_button"
116             launcher:direction="vertical"
117             />
118 
119         <ImageView
120             android:id="@+id/hotseat_left"
121             style="@style/HotseatButton.Left"
122             android:layout_below="@id/all_apps_button"
123 
124             android:src="@drawable/hotseat_phone"
125 
126             android:onClick="launchHotSeat"
127             />
128 <!-- onClick的值为响应方法-->
129         <ImageView
130             android:id="@+id/hotseat_right"
131             style="@style/HotseatButton.Right"
132             android:layout_above="@id/all_apps_button"
133 
134             android:src="@drawable/hotseat_browser"
135 
136             android:onClick="launchHotSeat"
137             />
138 <!-- 对浏览器进行的描述-->
139     </RelativeLayout>
140 </com.android.launcher2.DragLayer>
141 
142 

下面的还没有但是~~~这写就够我先学段时间了哈哈~~~