Settings-快捷方式BUG

最新推荐文章于 2025-02-19 03:00:00 发布

lwnlwn1

最新推荐文章于 2025-02-19 03:00:00 发布

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本文链接：https://blog.youkuaiyun.com/lwnlwn1/article/details/45583041

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本文详细解析了安卓系统的辅助功能设置界面，包括字幕切换、屏幕放大等功能的实现方式及对应的XML配置。深入探讨了CaptionPropertiesFragment等组件的布局与交互。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一：搜索英文状态的Settings快捷方式：<string name="settings_shortcut">Settings shortcut</string>

搜索settings_shortcut-->找到manifest中的启动界面<activity android:name="CreateShortcut" android:label="@string/settings_shortcut"结果计入之后这个activity是个列表activity结果码的activity它之前肯定有个activity跳转过来，显然走不通后得知，桌面小插件的程序是这个SettingsAppWidgetProvider

二：今天先说附加功能这个界面accessibility_settings这个类。

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onCreate()方法中

addPreferencesFromResource(R.xml.accessibility_settings);加载布局

initializeAllPreferences()执行实例化上面xml的控件

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onResume()方法

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分析captions字幕这个界面--> android:fragment="com.android.settings.accessibility.ToggleCaptioningPreferenceFragment切换字幕
android:key="captioning_preference_screen"可以推出是下面这个类

ToggleCaptioningPreferenceFragment这个类

xml文件是

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<FrameLayout
android:layout_width="match_parent"
android:layout_height="@dimen/captioning_preview_height" >

<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:src="@drawable/caption_background" />

<com.android.internal.widget.SubtitleView
android:id="@+id/preview_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|start"
android:layout_margin="16dp"
android:text="@string/captioning_preview_text" />
</FrameLayout>
------------------------------------------------------------------------------------------------------------------图片显示在上面

<fragment
android:id="@+id/properties_fragment"
android:name="com.android.settings.accessibility.CaptionPropertiesFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
---------------------------------------------------------------------------------------------------------------------是个fragment

</LinearLayout>

这个类里面就是实例化控件，设置显示字体，设置actionbar开关控件

----------------------------------------------------------------------------------------------------------------------------------------------------

继续分析

CaptionPropertiesFragment-------------------------------这个名字就是下面对应的那个fragment

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
android:fragment="com.android.settings.accessibility.ToggleCaptioningPreferenceFragment"
android:key="captioning_preference_screen"
android:title="@string/accessibility_captioning_title" >

<PreferenceCategory
android:key="standard"
android:title="@string/captioning_standard_options_title" >-----------------------------------------categry就是那个界面的fragment的第一个小标题
<com.android.settings.accessibility.LocalePreference---------------------------------------设置语言
android:key="captioning_locale"
android:persistent="false"
android:summary="%s"
android:title="@string/captioning_locale" />

<ListPreference
android:entries="@array/captioning_font_size_selector_titles"--------------------------------设置字体
android:entryValues="@array/captioning_font_size_selector_values"
android:key="captioning_font_size"
android:persistent="false"
android:summary="%s"
android:title="@string/captioning_text_size" />

<com.android.settings.accessibility.PresetPreference------------------------------------------------是那个captiong Style
android:key="captioning_preset"
android:persistent="false"
android:title="@string/captioning_preset" />
</PreferenceCategory>
<PreferenceCategory
android:key="custom"
android:title="@string/captioning_custom_options_title" >
<ListPreference
android:entries="@array/captioning_typeface_selector_titles"
android:entryValues="@array/captioning_typeface_selector_values"
android:key="captioning_typeface"
android:persistent="false"
android:summary="%s"
android:title="@string/captioning_typeface" />

<com.android.settings.accessibility.ColorPreference
android:key="captioning_foreground_color"
android:persistent="false"
android:title="@string/captioning_foreground_color" />

<com.android.settings.accessibility.EdgeTypePreference
android:key="captioning_edge_type"
android:persistent="false"
android:title="@string/captioning_edge_type" />

<com.android.settings.accessibility.ColorPreference
android:dependency="captioning_edge_type"
android:key="captioning_edge_color"
android:persistent="false"
android:title="@string/captioning_edge_color" />
<com.android.settings.accessibility.ColorPreference
android:key="captioning_background_color"
android:persistent="false"
android:title="@string/captioning_background_color" />
<com.android.settings.accessibility.ColorPreference
android:dependency="captioning_background_color"
android:key="captioning_background_opacity"
android:persistent="false"
android:title="@string/captioning_background_opacity" />
</PreferenceCategory>

</PreferenceScreen>