Launcher.xml 介绍 -----Android4.4 Launcher3 系列学习

我会直接在

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:launcher="http://schemas.android.com/apk/res-auto/com.android.launcher3"
    android:id="@+id/launcher"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/workspace_bg">
<!--上面到 android:background 属性，在这里提到，告知，此出并不是我们看到的墙纸。经常我们看到屏幕上下有渐变的黑色效果。其实就是它引起的。-->

<!--DragLayer ，我们要看DragLayer.java,实际上继承的是FrameLayer,目的是截获触屏事件。-->
    <com.android.launcher3.DragLayer
        android:id="@+id/drag_layer"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!-- The workspace contains 5 screens of cells -->

<!--Workspace 就是我们开机后看到的，可以存放快捷图标到工作区，这里可以根据用户需要，添加页数，删除页数-->
        <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>
<!--hostseat 是屏幕最下方的五个快捷键区域-->
        <include layout="@layout/hotseat"
            android:id="@+id/hotseat"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

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

        <!-- Keep these behind the workspace so that they are not visible when
             we go into AllApps -->

<!--显示页数到区域-->
        <include
            android:id="@+id/page_indicator"
            layout="@layout/page_indicator"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal" />
<!--显示搜索框的区域-->
        <include
            android:id="@+id/qsb_bar"
            layout="@layout/qsb_bar" />

        <!-- The Workspace cling must appear under the AppsCustomizePagedView below to ensure
             that it is still visible during the transition to AllApps and doesn't overlay on
             top of that view. -->
        <com.android.launcher3.ScrimView
            android:id="@+id/cling_scrim"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />
        <include layout="@layout/first_run_cling"
            android:id="@+id/first_run_cling"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />
        <include layout="@layout/workspace_cling"
            android:id="@+id/workspace_cling"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />
        <include layout="@layout/folder_cling"
            android:id="@+id/folder_cling"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="gone" />

        <!-- This is the search bar voice button proxy view.  It allows us to have a larger
             touch target than the microphone constrained by the search bar bounds. -->
        <com.android.launcher3.DrawableStateProxyView
            android:id="@+id/voice_button_proxy"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_gravity="top|end"
            android:clickable="true"
            android:onClick="onClickVoiceButton"
            android:importantForAccessibility="no"
            launcher:sourceViewId="@+id/voice_button" />
<!--点击进入all apps 显示到区域-->
        <include layout="@layout/apps_customize_pane"
            android:id="@+id/apps_customize_pane"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="invisible" />
    </com.android.launcher3.DragLayer>
</FrameLayout>