如何获得 Android 系统偏好设置?

How to get Android system preferences look?

棒棒糖上的 android 系统首选项屏幕似乎使用了类似于 "card layout" 的布局。

我正在尝试为我的应用程序获得相同的外观,但看不到他们如何使用默认 PreferenceFragment 实现它。任何人都可以向我解释一下,如何在不编写自己的偏好的情况下达到相同的效果?


请注意,我已经看到并阅读了这些问题,但它们没有提供合适的答案:


如果感兴趣,我当前的偏好 xml 如下所示:

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:custom="http://schemas.android.com/apk/res-auto">

    <PreferenceCategory android:title="@string/preferences_title_general">
        <Preference
            android:key="Prefs.Delete.Row.Token"
            android:summary="@string/preferences_delete_row_token_summary"
            android:title="@string/preferences_delete_row_token_title"/>
        <Preference
            android:key="Prefs.Delete.Cell.Token"
            android:summary="@string/preferences_delete_cell_token_summary"
            android:title="@string/preferences_delete_cell_token_title"/>
        <Preference
            android:key="Prefs.Null.Token"
            android:summary="@string/preferences_null_token_summary"
            android:title="@string/preferences_null_token_title"/>
    </PreferenceCategory>
    <PreferenceCategory android:title="@string/preferences_title_appearance">
        <SwitchPreference
            android:dialogTitle="@string/preferences_theme_title"
            android:key="Prefs.Appearance.Theme"
            android:summaryOff="@string/preferences_theme_summary_off"
            android:summaryOn="@string/preferences_theme_summary_on"
            android:switchTextOff="@string/general_no"
            android:switchTextOn="@string/general_yes"
            android:title="@string/preferences_theme_title"/>
    </PreferenceCategory>
    <PreferenceCategory android:title="@string/preferences_title_misc">
        <SwitchPreference
            android:dialogTitle="@string/preferences_read_back_title"
            android:key="Prefs.Voice.Feedback"
            android:switchTextOff="@string/general_no"
            android:switchTextOn="@string/general_yes"
            android:title="@string/preferences_read_back_title"/>
        <Preference
            android:key="Prefs.Export.Barcode.Properties"
            android:title="@string/preferences_export_title"
            android:summary="@string/preferences_export_summary"/>
        <Preference
            android:key="Prefs.Show.Eula"
            android:title="@string/preferences_eula_title"
            android:summary="@string/preferences_eula_summary"/>
    </PreferenceCategory>

</PreferenceScreen>

然后我扩展 PreferenceFragment 并通过

加载 xml
addPreferencesFromResource(R.xml.prefs);

我 "solved" 通过在 PreferenceCategory 项目之间添加一个虚拟 Preference 来实现这一点,该项目使用模仿问题屏幕截图外观的布局:

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:custom="http://schemas.android.com/apk/res-auto">
    <PreferenceCategory></PreferenceCategory>

    <Preference layout="@layout/preference_divider" />

    <PreferenceCategory></PreferenceCategory>
</PreferenceScreen>

布局看起来像这样:

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

    <View     android:layout_width="match_parent"
              android:layout_height="5dp"
              android:background="@drawable/shadow_bottom" />

    <View     android:layout_width="match_parent"
              android:layout_height="5dp"
              android:background="@drawable/shadow_top" />

</LinearLayout>

对我来说,通过自定义布局设置背景不起作用。身高也不适用。

虽然对我有用:

public class PreferenceDivider  extends Preference {
    public PreferenceDivider(Context context) {
        super(context);
    }
    public PreferenceDivider(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    @Override
    protected View onCreateView(ViewGroup parent) {
        Resources res=getContext().getResources();
        View v=super.onCreateView(parent);
        v.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, res.getDimensionPixelSize(R.dimen.divider_height)));
        v.setBackground(res.getDrawable(R.drawable.preference_category_divider, null));
        return v;
    }
}

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:custom="http://schemas.android.com/apk/res-auto">
    <PreferenceCategory/>>

    <your.package.path.PreferenceDivider/>

    <PreferenceCategory/>>

</PreferenceScreen>

这里有 9 个补丁图像:https://drive.google.com/file/d/1M5uXXnFc0HHx2BOHQqLtvAXFet4ICDj0/view?usp=sharing