android 定制PreferenceScreen

在使用PreferenceActivity的时候，布局文件的格式一般是这样的：

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<PreferenceCategory
android:title="@string/launch_preferences">
<!--ThisPreferenceScreentagsendstheusertoanewfragmentof
preferences.Ifrunninginalargescreen,theycanbeembedded
insideoftheoverallpreferencesUI.-->
<PreferenceScreen
android:fragment="com.example.android.apis.preference.PreferenceWithHeaders$Prefs1FragmentInner"
android:title="@string/title_fragment_preference"
android:summary="@string/summary_fragment_preference">
<extraandroid:name="someKey"android:value="somePrefValue"/>
</PreferenceScreen>
<!--ThisPreferenceScreentagsendstheusertoacompletelydifferent
activity,switchingoutofthecurrentpreferencesUI.-->
<PreferenceScreen
android:title="@string/title_intent_preference"
android:summary="@string/summary_intent_preference">
<intentandroid:action="android.intent.action.VIEW"
android:data="http://www.android.com"/>
</PreferenceScreen>
</PreferenceCategory>

    <PreferenceCategory            android:title="@string/launch_preferences">        <!-- This PreferenceScreen tag sends the user to a new fragment of             preferences.  If running in a large screen, they can be embedded             inside of the overall preferences UI. -->        <PreferenceScreen                android:fragment="com.example.android.apis.preference.PreferenceWithHeaders$Prefs1FragmentInner"                android:title="@string/title_fragment_preference"                android:summary="@string/summary_fragment_preference">            <!-- Arbitrary key/value pairs can be included for fragment arguments -->            <extra android:name="someKey" android:value="somePrefValue" />        </PreferenceScreen>        <!-- This PreferenceScreen tag sends the user to a completely different             activity, switching out of the current preferences UI. -->        <PreferenceScreen                android:title="@string/title_intent_preference"                android:summary="@string/summary_intent_preference">            <intent android:action="android.intent.action.VIEW"                    android:data="http://www.android.com" />        </PreferenceScreen>    </PreferenceCategory>

但是我们不能控制其中的title和summary的字体的样式，使用的是系统的样式

怎么样修改title和summary的字体和颜色呢？

这里主要以PreferenceScreen为例说明：

首先PreferenceScreen的布局文件在 framework中

位置如下 /framework/base/core/res/res/layout/preference.xml具体内容如下

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<?xmlversion="1.0"encoding="utf-8"?>
<!--Copyright(C)2006TheAndroidOpenSourceProject
LicensedundertheApacheLicense,Version2.0(the"License");
youmaynotusethisfileexceptincompliancewiththeLicense.
YoumayobtainacopyoftheLicenseat
http://www.apache.org/licenses/LICENSE-2.0
Unlessrequiredbyapplicablelaworagreedtoinwriting,software
distributedundertheLicenseisdistributedonan"ASIS"BASIS,
WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.
SeetheLicenseforthespecificlanguagegoverningpermissionsand
limitationsundertheLicense.
-->
<!--LayoutforaPreferenceinaPreferenceActivity.The
Preferenceisabletoplaceaspecificwidgetforitsparticular
typeinthe"widget_frame"layout.-->
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical"
android:paddingRight="?android:attr/scrollbarSize">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="15dip"
android:layout_marginRight="6dip"
android:layout_marginTop="6dip"
android:layout_marginBottom="6dip"
android:layout_weight="1">
<TextViewandroid:id="@+android:id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textAppearance="?android:attr/textAppearanceLarge"
android:ellipsize="marquee"
android:fadingEdge="horizontal"/>
<TextViewandroid:id="@+android:id/summary"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@android:id/title"
android:layout_alignLeft="@android:id/title"
android:textAppearance="?android:attr/textAppearanceSmall"
android:maxLines="4"/>
</RelativeLayout>
<LinearLayoutandroid:id="@+android:id/widget_frame"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="vertical"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?><!-- Copyright (C) 2006 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.--><!-- Layout for a Preference in a PreferenceActivity. The     Preference is able to place a specific widget for its particular     type in the "widget_frame" layout. --><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"    android:layout_height="wrap_content"    android:minHeight="?android:attr/listPreferredItemHeight"    android:gravity="center_vertical"    android:paddingRight="?android:attr/scrollbarSize">        <RelativeLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="15dip"        android:layout_marginRight="6dip"        android:layout_marginTop="6dip"        android:layout_marginBottom="6dip"        android:layout_weight="1">            <TextView android:id="@+android:id/title"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:singleLine="true"            android:textAppearance="?android:attr/textAppearanceLarge"            android:ellipsize="marquee"            android:fadingEdge="horizontal" />                    <TextView android:id="@+android:id/summary"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_below="@android:id/title"            android:layout_alignLeft="@android:id/title"            android:textAppearance="?android:attr/textAppearanceSmall"            android:maxLines="4" />    </RelativeLayout>        <!-- Preference should place its actual preference widget here. -->    <LinearLayout android:id="@+android:id/widget_frame"        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:gravity="center_vertical"        android:orientation="vertical" /></LinearLayout>

可以看到PreferenceScreen的布局文件中主要的是两个TextView分别显示title和summary

我们在每个app中可以按照这个样式重新定义PreferenceScreen的样式，比如我们可以定义一个custom_preference.xml文件内容和上面的差不多，只不过重新定义了其text的大小和颜色，在

[html] view plain copy print ?

<PreferenceScreen
android:fragment="com.example.android.apis.preference.PreferenceWithHeaders$Prefs1FragmentInner"
android:title="@string/title_fragment_preference"
android:summary="@string/summary_fragment_preference">
<extraandroid:name="someKey"android:value="somePrefValue"/>
</PreferenceScreen>

 <PreferenceScreen                android:fragment="com.example.android.apis.preference.PreferenceWithHeaders$Prefs1FragmentInner"                android:title="@string/title_fragment_preference"                android:summary="@string/summary_fragment_preference">            <!-- Arbitrary key/value pairs can be included for fragment arguments -->            <extra android:name="someKey" android:value="somePrefValue" />        </PreferenceScreen>

添加一个属性 android:layout="@layout/custom_preference" 加载自己的定义的preference的布局文件即可。

以此还可以重新定义对应的

PrefercenceCategory 样式文件 --------------- framework/base/core/res/res/preference_category.xml

CheckBoxPreference 样式文件----------------- frameworks/base/core/res/res/layout/preference_widget_checkbox.xml

EditTextPreference 样式文件-----------------frameworks/base/core/res/res/layout/preference_dialog_edittext.xml

当然可能还有其他的更好的方法，希望和大家多多交流

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