Android Framework-Launcher-UI和组件

开局一张图，剩下全靠编。

Launcher 基础结构图，使用 monitor 截取

结合Launcher的xml布局

DragLayer 事件大管家，基本拖拽手势都在这里面
Workspace 负责应用列表，继承PagedView，可以简单理解成ViewPager
hotSet 底部快捷栏，就是我们常见的短信/电话在最下面
WorkspacePageIndicator 指示器
CellLayout 每个单独的页面，负责装载App列表，可以理解为ViewPager里面的页面。

xml 复制代码

<?xml version="1.0" encoding="utf-8"?>
<com.android.launcher3.LauncherRootView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:launcher="http://schemas.android.com/apk/res-auto"
    android:id="@+id/launcher"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <com.android.launcher3.dragndrop.DragLayer
        android:id="@+id/drag_layer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:importantForAccessibility="no">

        <com.android.launcher3.views.AccessibilityActionsView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:contentDescription="@string/home_screen"
            />

        <!-- The workspace contains 5 screens of cells -->
        <!-- DO NOT CHANGE THE ID -->
        <com.android.launcher3.Workspace
            android:id="@+id/workspace"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:theme="@style/HomeScreenElementTheme"
            launcher:pageIndicator="@+id/page_indicator" />

        <!-- DO NOT CHANGE THE ID -->
        <include
            android:id="@+id/hotseat"
            layout="@layout/hotseat" />

        <!-- Keep these behind the workspace so that they are not visible when
         we go into AllApps -->
        <com.android.launcher3.pageindicators.WorkspacePageIndicator
            android:id="@+id/page_indicator"
            android:layout_width="match_parent"
            android:layout_height="@dimen/workspace_page_indicator_height"
            android:layout_gravity="bottom|center_horizontal"
            android:theme="@style/HomeScreenElementTheme" />

        <include
            android:id="@+id/drop_target_bar"
            layout="@layout/drop_target_bar" />

        <com.android.launcher3.views.ScrimView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/scrim_view"
            android:background="@android:color/transparent" />

        <include
            android:id="@+id/apps_view"
            layout="@layout/all_apps"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <include
            android:id="@+id/overview_panel"
            layout="@layout/overview_panel" />

    </com.android.launcher3.dragndrop.DragLayer>

</com.android.launcher3.LauncherRootView>