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我正在爲我的應用程序的設置活動工作。我爲喜好設置了兩個標題，然後爲每個標題創建了片段。問題是當我點擊標題時，什麼也沒有顯示。感謝您的幫助。當我點擊標題，沒有偏好顯示
這裏是我的偏好活動
public class Preferences extends PreferenceActivity {
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.prefheads, target);
}
}
這是第一個片段
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);
}
}
}
這裏是第二個片段：
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： 頭
<?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>
Fragment2：
<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>