Lancher3默认桌面显示

代码位置
packages/apps/Launcher3/src/com/android/launcher3/Workspace.java

        mOriginalDefaultPage = mDefaultPage = a.getInt(R.styleable.Workspace_defaultScreen, 1);

// 通过styleable name + _attr name得到属性值，如果没有定义则默认为1

packages/apps/Launcher3/res/values/attrs.xml

    <declare-styleable name="Workspace">
        <!-- The first screen the workspace should display. -->
        <attr name="defaultScreen" format="integer"  />
        <!-- The number of horizontal cells in the CellLayout -->
        <attr name="cellCountX" format="integer"  />
        <!-- The number of vertical cells in the CellLayout -->
        <attr name="cellCountY" format="integer"  />
    </declare-styleable>

packages/apps/Launcher3/layout-port/launcher.xml

        <com.android.launcher3.Workspace
            android:id="@+id/workspace"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            launcher:defaultScreen="@integer/config_workspaceDefaultScreen"
            launcher:pageSpacing="@dimen/workspace_page_spacing"
            launcher:pageIndicator="@id/page_indicator">
        </com.android.launcher3.Workspace>

修改位置(默认显示第三页)

packages/apps/Launcher3/res/values/config.xml

-    <integer name="config_workspaceDefaultScreen">0</integer>
+    <integer name="config_workspaceDefaultScreen">2</integer>