Android Launcher2分析之（一）----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

 <?xml version="1.0" encoding="utf-8"?><!--/***** Copyright 2008, 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.*/--><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.android.zkx_launcher" android:sharedUserId="@string/sharedUserId" ><!-- 应用程序的包名 --> <!-- <original-package android:name="com.android.zkx_launcher2" /> --><!-- 对系统资源的访问权限 --> <permission android:name="com.android.zkx_launcher.permission.INSTALL_SHORTCUT" android:permissionGroup="android.permission-group.SYSTEM_TOOLS" android:protectionLevel="normal" android:label="@string/permlab_install_shortcut" android:description="@string/permdesc_install_shortcut" /> <permission android:name="com.android.zkx_launcher.permission.UNINSTALL_SHORTCUT" android:permissionGroup="android.permission-group.SYSTEM_TOOLS" android:protectionLevel="normal" android:label="@string/permlab_uninstall_shortcut" android:description="@string/permdesc_uninstall_shortcut"/> <permission android:name="com.android.zkx_launcher.permission.READ_SETTINGS" android:permissionGroup="android.permission-group.SYSTEM_TOOLS" android:protectionLevel="normal" android:label="@string/permlab_read_settings" android:description="@string/permdesc_read_settings"/> <permission android:name="com.android.zkx_launcher.permission.WRITE_SETTINGS" android:permissionGroup="android.permission-group.SYSTEM_TOOLS" android:protectionLevel="normal" android:label="@string/permlab_write_settings" android:description="@string/permdesc_write_settings"/> <uses-permission android:name="android.permission.CALL_PHONE" /> <uses-permission android:name="android.permission.EXPAND_STATUS_BAR" /> <uses-permission android:name="android.permission.GET_TASKS" /> <uses-permission android:name="android.permission.READ_CONTACTS"/> <uses-permission android:name="android.permission.SET_WALLPAPER" /> <uses-permission android:name="android.permission.SET_WALLPAPER_HINTS" /> <uses-permission android:name="android.permission.VIBRATE" /> <uses-permission android:name="android.permission.WRITE_SETTINGS" /> <uses-permission android:name="android.permission.BIND_APPWIDGET" /> <uses-permission android:name="com.android.launcher.permission.READ_SETTINGS" /> <uses-permission android:name="com.android.launcher.permission.WRITE_SETTINGS" /> <!-- 对应用程序的配置 --> <application android:name="LauncherApplication" android:process="@string/process" android:label="@string/application_name" android:icon="@drawable/ic_launcher_home"><!--配置应用程序额的名字，进程，标签，和图标 label的值为values/strings.xml中application_name 键值对的值 icon为drawable目录下名为的ic_launcher_home的图片 实际上该图片的位置位于drawable-hdpi（高分辨率）目录下，是个小房子这个主要是为了支持多分辨率的. hdpi里面主要放高分辨率的图片, 如WVGA (480x800),FWVGA (480x854)mdpi里面主要放中等分辨率的图片, 如HVGA (320x480)ldpi里面主要放低分辨率的图片, 如QVGA (240x320)系统会根据机器的分辨率来分别到这几个文件夹里面去找对应的图片 所以在开发程序时为了兼容不同平台不同屏幕，建议各自文件夹根据需求均存放不同版本图片. 只需要在res目录下创建不同的layout文件夹，比如layout-640x360,layout-800x480,所有的layout文件在编译之后都会写入R.java里，而系统会根据屏幕的大小自己选择合适的layout进行使用 --> <!--设置intent-filter可以先启动该Activity --> <activity android:name="Launcher" android:launchMode="singleTask" android:clearTaskOnLaunch="true" android:stateNotNeeded="true" android:theme="@style/Theme" android:screenOrientation="nosensor" android:windowSoftInputMode="stateUnspecified|adjustPan"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.HOME" /> <category android:name="android.intent.category.DEFAULT" /> <category android:name="android.intent.category.MONKEY"/> </intent-filter> </activity> <!--设置Wallpapaer的Activity --> <activity android:name="WallpaperChooser" android:label="@string/pick_wallpaper" android:icon="@drawable/ic_launcher_wallpaper" android:screenOrientation="nosensor" android:finishOnCloseSystemDialogs="true"> <intent-filter> <action android:name="android.intent.action.SET_WALLPAPER" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity><!--安装快捷方式的Intent --> <!-- Intent received used to install shortcuts from other applications --> <receiver android:name="InstallShortcutReceiver" android:permission="com.android.zkx_launcher.permission.INSTALL_SHORTCUT"> <intent-filter> <action android:name="com.android.zkx_launcher.action.INSTALL_SHORTCUT" /> </intent-filter> </receiver><!--卸载快捷方式的Intent --> <!-- Intent received used to uninstall shortcuts from other applications --> <receiver android:name="UninstallShortcutReceiver" android:permission="com.android.zkx_launcher.permission.UNINSTALL_SHORTCUT"> <intent-filter> <action android:name="com.android.zkx_launcher.action.UNINSTALL_SHORTCUT" /> </intent-filter> </receiver><!-- 供应商信息--> <!-- The settings provider contains Home's data, like the workspace favorites --> <provider android:name="LauncherProvider" android:authorities="com.android.zkx_launcher.settings" android:writePermission="com.android.zkx_launcher.permission.WRITE_SETTINGS" android:readPermission="com.android.zkx_launcher.permission.READ_SETTINGS" /> </application></manifest>