Launcher.java

static final int SCREEN_COUNT = 5;
static final int DEFAULT_SCREEN = 2;//第一页是从0开始计数，这里是把第三个页面作为默认首页

launcher.xml

  <com.android.launcher2.Workspace  

android:id="@+id/workspace"  

android:layout_width="match_parent"  

android:layout_height="match_parent"  

android:scrollbars="horizontal"  

android:fadeScrollbars="true"  

launcher:defaultScreen="2"> 

workspace.java

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

workspace.xml

<com.android.launcher2.Workspace
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:launcher="http://schemas.android.com/apk/res/com.android.launcher"
    android:paddingTop="@dimen/workspace_content_large_only_top_margin"
    launcher:defaultScreen="2"                         修改默认HOME屏
    launcher:pageSpacing="@dimen/workspace_page_spacing">

Lanucherr 默认显示第几屏