为什么searchView的子控件是TextView不是EditText？

SearchView 从LinearLayout派生的。有源码直接看就行了

<?xml version="1.0" encoding="utf-8"?>

<!--

/*

 * Copyright (C) 2010 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



-->

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/search_bar"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal">



    <!-- This is actually used for the badge icon *or* the badge label (or neither) -->

    <TextView

        android:id="@+id/search_badge"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:gravity="center_vertical"

        android:layout_marginBottom="2dip"

        android:drawablePadding="0dip"

        android:textAppearance="?attr/textAppearanceMedium"

        android:textColor="?attr/textColorPrimary"

        android:visibility="gone" />



    <ImageView

        android:id="@+id/search_button"

        style="?attr/actionButtonStyle"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:layout_gravity="center_vertical"

        android:focusable="true"

        android:contentDescription="@string/searchview_description_search"

        android:tooltipText="@string/searchview_description_search" />



    <LinearLayout

        android:id="@+id/search_edit_frame"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:layout_weight="1"

        android:layout_marginStart="8dip"

        android:layout_marginEnd="8dip"

        android:orientation="horizontal"

        android:layoutDirection="locale">



        <ImageView

            android:id="@+id/search_mag_icon"

            android:layout_width="@dimen/dropdownitem_icon_width"

            android:layout_height="wrap_content"

            android:scaleType="centerInside"

            android:layout_marginStart="@dimen/dropdownitem_text_padding_left"

            android:layout_gravity="center_vertical"

            android:visibility="gone" />



        <!-- Inner layout contains the app icon, button(s) and EditText -->

        <LinearLayout

            android:id="@+id/search_plate"

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:layout_gravity="center_vertical"

            android:orientation="horizontal">



            <view class="android.widget.SearchView$SearchAutoComplete"

                android:id="@+id/search_src_text"

                android:layout_height="36dip"

                android:layout_width="0dp"

                android:layout_weight="1"

                android:layout_gravity="center_vertical"

                android:paddingStart="@dimen/dropdownitem_text_padding_left"

                android:paddingEnd="@dimen/dropdownitem_text_padding_right"

                android:singleLine="true"

                android:ellipsize="end"

                android:background="@null"

                android:inputType="text|textAutoComplete|textNoSuggestions"

                android:imeOptions="actionSearch"

                android:dropDownHeight="wrap_content"

                android:dropDownAnchor="@id/search_edit_frame"

                android:dropDownVerticalOffset="0dip"

                android:dropDownHorizontalOffset="0dip" />



            <ImageView

                android:id="@+id/search_close_btn"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:paddingStart="8dip"

                android:paddingEnd="8dip"

                android:layout_gravity="center_vertical"

                android:background="?attr/selectableItemBackgroundBorderless"

                android:focusable="true"

                android:contentDescription="@string/searchview_description_clear" />



        </LinearLayout>



        <LinearLayout

            android:id="@+id/submit_area"

            android:orientation="horizontal"

            android:layout_width="wrap_content"

            android:layout_height="match_parent">



            <ImageView

                android:id="@+id/search_go_btn"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:layout_gravity="center_vertical"

                android:paddingStart="16dip"

                android:paddingEnd="16dip"

                android:background="?attr/selectableItemBackgroundBorderless"

                android:visibility="gone"

                android:focusable="true"

                android:contentDescription="@string/searchview_description_submit" />



            <ImageView

                android:id="@+id/search_voice_btn"

                android:layout_width="wrap_content"

                android:layout_height="match_parent"

                android:layout_gravity="center_vertical"

                android:paddingStart="16dip"

                android:paddingEnd="16dip"

                android:background="?attr/selectableItemBackgroundBorderless"

                android:visibility="gone"

                android:focusable="true"

                android:contentDescription="@string/searchview_description_voice" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

真正的输入框是 AutoCompleteTextView 是从EditText派生的