我正在为我的应用程序进行设置活动。我为首选项设置了两个标题，然后为每个标题制作了片段。问题是当我点击标题时，什么也没有出现。谢谢您的帮助。
这是我的偏好活动
public class Preferences extends PreferenceActivity {
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.prefheads, target);
}
}
这是第一个片段
public class Prefs1 extends PreferenceFragment {
public static class SettingsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.fragment_prefs1);
}
}
}
这是第二个片段：
public class Prefs2 extends PreferenceFragment {
public static class SettingsFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.fragment_prefs2);
}
}
}
XML 文件：标头
<?xml version="1.0" encoding="utf-8"?>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<header
android:fragment="com.example.lubys.prefs.prefs1"
android:title="First category"
android:summary="This doesnt need summary" />
<header
android:fragment="com.example.lubys.prefs.prefs2"
android:title="Second cat"
android:summary="This is awful summary">
</header>
</preference-headers>
片段1：
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.lubys.prefs.prefs1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<PreferenceCategory
android:title="the title"
android:key="key2">
<EditTextPreference android:title="Your Name"
android:key="username"
android:summary="Please provide your username"></EditTextPreference>
<CheckBoxPreference android:title="Application Updates"
android:defaultValue="false"
android:summary="This option if selected will allow the application to check for latest versions."
android:key="applicationUpdates" />
<ListPreference
android:title="Download Details"
android:summary="Select the kind of data that you would like to download"
android:key="downloadType"
android:defaultValue="1"
android:entries="@array/c"
android:entryValues="@array/c" />
</PreferenceCategory>
</PreferenceScreen>
片段2：
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.lubys.prefs.prefs1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<PreferenceCategory
android:title="sms"
android:key="pref_key_storage_settings">
<CheckBoxPreference
android:key="saas"
android:summary="asde"
android:title="Something"
android:defaultValue="false"/>
</PreferenceCategory>
</PreferenceScreen>