Android中源码Launcher主屏幕程序排列详解

本文主要是介绍Android中源码Launcher主屏幕程序排列详解，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

转自： http://blog.csdn.net/wdaming1986/article/details/6978814

最近研究Lancher，从短信Mms的框架中过度到Launcher的bug和需求修改中，下面对launcher最简单的主屏幕程序的程序的布局的详解，给读者一个入门的感觉，android的主屏幕一共分为5个屏幕，从左到右依次是：0,1,2,3,4。所以想在那个主屏幕放哪些程序或者widget都可以在布局文件中实现，下面我就说说这个布局文件default_workspace.xml。这是对主屏幕进行排列的布局文件，在这里面写好，程序运行后就可以实现哪个屏幕放那些特定的程序或widget了。下面先看截图，分别为图（1）和图（2）。图（1）为3屏即为主屏的布局，最下面放了4个程序的快捷方式。图（2）为我粗糙地画了一个大概的一个面貌，屏幕一般被分为2维坐标的，左上角为原点（0,0），横向的为x轴（坐标向右依次加1，分别是0,1,2,3），竖向的为y轴（向下依次加1，分别是0,1,2,3）。

先看截图，下面看布局文件中的代码：

图（1）图（2）

下面看布局文件中的代码:

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<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<favorites xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher">
<appwidget
launcher:packageName="com.google.android.apps.genie.geniewidget"
launcher:className="com.google.android.apps.genie.geniewidget.miniwidget.MiniWidgetProvider"
launcher:screen="1"
launcher:x="0"
launcher:y="0"
launcher:spanX="4"
launcher:spanY="1" />
<search
launcher:screen="2"
launcher:x="0"
launcher:y="0" />
<appwidget
launcher:packageName="com.android.protips"
launcher:className="com.android.protips.ProtipWidget"
launcher:screen="2"
launcher:x="0"
launcher:y="1"
launcher:spanX="4"
launcher:spanY="1" />
<favorite
launcher:packageName="com.android.Mms"
launcher:className="com.android.Mms.MainActivity"
launcher:screen="2"
launcher:x="0"
launcher:y="3"
/>
<favorite
launcher:packageName="com.android.phone"
launcher:className="com.android.phone.MainActivity"
launcher:screen="2"
launcher:x="1"
launcher:y="3"
/>
<favorite
launcher:packageName="com.android.Email"
launcher:className="com.android.Email.MainActivity"
launcher:screen="2"
launcher:x="2"
launcher:y="3"
/>
<favorite
launcher:packageName="com.android.yuemei"
launcher:className="com.android.yuemei.MainActivity"
launcher:screen="2"
launcher:x="3"
launcher:y="3"
/>
<appwidget
launcher:packageName="com.android.music"
launcher:className="com.android.music.MediaAppWidgetProvider"
launcher:screen="3"
launcher:x="0"
launcher:y="0"
launcher:spanX="4"
launcher:spanY="1" />
<appwidget
launcher:packageName="com.android.vending"
launcher:className="com.android.vending.MarketWidgetProvider"
launcher:screen="3"
launcher:x="1"
launcher:y="1"
launcher:spanX="2"
launcher:spanY="2" />
</favorites>