2011.06.09——— android 1.6 launcher研究之修改worksapce上的屏数

2011.06.09——— android 1.6 launcher研究之修改worksapce上的屏数

参考：http://blog.csdn.net/fzh0803/archive/2011/03/26/6279995.aspx
http://gqdy365.iteye.com/blog/897638
http://www.cnblogs.com/playing/archive/2011/03/26/1996209.html

android1.6的版本有3个屏需要把它改为5个屏需要修改的地方如下

1、Launcher.java

static final int SCREEN_COUNT = 5;static final int DEFAULT_SCREN = 2;

2、launcher.xml

<com.lp.launcher.Workspace        android:id="@+id/workspace"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        launcher:defaultScreen="2">//从0开始        <include android:id="@+id/cell1" layout="@layout/workspace_screen" />        <include android:id="@+id/cell2" layout="@layout/workspace_screen" />        <include android:id="@+id/cell3" layout="@layout/workspace_screen" />        <include android:id="@+id/cell4" layout="@layout/workspace_screen" />        <include android:id="@+id/cell5" layout="@layout/workspace_screen" /></com.lp.launcher.Workspace>

defaultScreen 修改为2 然后加两个<include />

然后修改默认显示的屏

3、Workspace.java

修改构造方法里面的

mDefaultScreen = a.getInt(R.styleable.Workspace_defaultScreen, 2);//从0开始

这时基本上已经可以显示5个屏幕了默认的屏也是第三个屏了但是进去后默认显示的屏什么也没有我们需要把组建都挪到默认屏上去

4、default_workspace.xml

修改所有的 launcher:screen 为 2

launcher:screen="2"

修改完这个后如果你不是make到源码而是以app的方式安装到手机上的话就必须先卸载原有的这个程序然后在部署

但是这里有一个问题我们上次修改的标记也需要修改

5、home_arrows_left.xml home_arrows_right.xml

<level-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:maxLevel="0" android:drawable="@android:color/transparent" />    <item android:maxLevel="1" android:drawable="@drawable/home_arrows_left_1" />    <item android:maxLevel="2" android:drawable="@drawable/home_arrows_left_2" />    <item android:maxLevel="3" android:drawable="@drawable/home_arrows_left_3" />    <item android:maxLevel="4" android:drawable="@drawable/home_arrows_left_4" />    </level-list><level-list xmlns:android="http://schemas.android.com/apk/res/android">        <item android:maxLevel="0" android:drawable="@drawable/home_arrows_right_4" />    <item android:maxLevel="1" android:drawable="@drawable/home_arrows_right_3" />    <item android:maxLevel="2" android:drawable="@drawable/home_arrows_right_2" />    <item android:maxLevel="3" android:drawable="@drawable/home_arrows_right_1" />    <item android:maxLevel="4" android:drawable="@android:color/transparent" />   </level-list>

大功告成 over

最后说一个期间的一个知识
自定义控件的属性 declare-styleable

比如说我们上面修改的 launcher:defaultScreen="2" 这个就是自定义的属性因为这属性不是ViewGroup（workspace类是继承于ViewGroup）所定义的属性

1、在\res\values里面的attrs.xml里面定义

<resources><declare-styleable name="Workspace">        <!-- The first screen the workspace should display. -->        <attr name="defaultScreen" format="integer"  />    </declare-styleable>        <!-- CellLayout specific attributes. These attributes are used to customize         a CellLayout view in XML files. -->    <declare-styleable name="CellLayout">        <!-- The width of a single cell -->        <attr name="cellWidth" format="dimension"  />        <!-- The height of a single cell -->        <attr name="cellHeight" format="dimension"  />        <!-- Padding to apply at the start of the long axis -->        <attr name="longAxisStartPadding" format="dimension"  />        <!-- Padding to apply at the end of the long axis -->        <attr name="longAxisEndPadding" format="dimension"  />        <!-- Padding to apply at the start of the short axis -->        <attr name="shortAxisStartPadding" format="dimension"  />        <!-- Padding to apply at the end of the short axis -->        <attr name="shortAxisEndPadding" format="dimension"  />        <!-- Number of cells on the short axis of the CellLayout -->        <attr name="shortAxisCells" format="integer" />        <!-- Number of cells on the long axis of the CellLayout -->        <attr name="longAxisCells" format="integer" />    </declare-styleable></resources>

2、layout.xml引用

先申明xmlns:launcher="http://schemas.android.com/apk/res/com.lp.launcher"（R.java)，这样就可以使用launcher:defaultScreen。

3、java文件取值

       public Workspace(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Workspace, defStyle, 0);        mDefaultScreen = a.getInt(R.styleable.Workspace_defaultScreen, 2);        a.recycle();        initWorkspace();    }

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