<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"><CheckBoxPreferenceandroid:key="pref_sync"android:title="@string/pref_sync"android:summary="@string/pref_sync_summ"android:defaultValue="true" /><ListPreferenceandroid:dependency="pref_sync"android:key="pref_syncConnectionType"android:title="@string/pref_syncConnectionType"android:dialogTitle="@string/pref_syncConnectionType"android:entries="@array/pref_syncConnectionTypes_entries"android:entryValues="@array/pref_syncConnectionTypes_values"android:defaultValue="@string/pref_syncConnectionTypes_default" />
</PreferenceScreen>

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"><PreferenceCategory android:title="@string/pref_sms_storage_title"android:key="pref_key_storage_settings"><CheckBoxPreferenceandroid:key="pref_key_auto_delete"android:summary="@string/pref_summary_auto_delete"android:title="@string/pref_title_auto_delete"android:defaultValue="false"... /><Preference android:key="pref_key_sms_delete_limit"android:dependency="pref_key_auto_delete"android:summary="@string/pref_summary_delete_limit"android:title="@string/pref_title_sms_delete"... /><Preference android:key="pref_key_mms_delete_limit"android:dependency="pref_key_auto_delete"android:summary="@string/pref_summary_delete_limit"android:title="@string/pref_title_mms_delete" ... /></PreferenceCategory>...
</PreferenceScreen>

<PreferenceScreen  xmlns:android="http://schemas.android.com/apk/res/android"><!--打开一个subscreen --><PreferenceScreenandroid:key="button_voicemail_category_key"android:title="@string/voicemail"android:persistent="false"><ListPreferenceandroid:key="button_voicemail_provider_key"android:title="@string/voicemail_provider" ... /><!--打开另一个嵌套的subscreen --><PreferenceScreenandroid:key="button_voicemail_setting_key"android:title="@string/voicemail_settings"android:persistent="false">...</PreferenceScreen><RingtonePreferenceandroid:key="button_voicemail_ringtone_key"android:title="@string/voicemail_ringtone_title"android:ringtoneType="notification" ... />...</PreferenceScreen>...
</PreferenceScreen>

<Preference android:title="@string/prefs_web_page" ><intent android:action="android.intent.action.VIEW"android:data="http://www.example.com" />
</Preference>

public class SettingsActivity extends PreferenceActivity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);addPreferencesFromResource(R.xml.preferences);}
}

public static class SettingsFragment extends PreferenceFragment {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);addPreferencesFromResource(R.xml.preferences);}...
}

public class SettingsActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();}
}

<CheckBoxPreferenceandroid:defaultValue="true"... /><ListPreferenceandroid:defaultValue="@string/pref_syncConnectionTypes_default"... />

PreferenceManager.setDefaultValues(this, R.xml.advanced_preferences, false);

<?xml version="1.0" encoding="utf-8"?>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android"><header android:fragment="com.example.prefs.SettingsActivity$SettingsFragmentOne"android:title="@string/prefs_category_one"android:summary="@string/prefs_summ_category_one" /><header android:fragment="com.example.prefs.SettingsActivity$SettingsFragmentTwo"android:title="@string/prefs_category_two"android:summary="@string/prefs_summ_category_two" ><!—这个键值对可以当成一个fragment的参数--><extra android:name="someKey" android:value="someHeaderValue" /></header>
</preference-headers>

public static class SettingsFragment extends PreferenceFragment {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);String settings = getArguments().getString("settings");if ("notifications".equals(settings)) {addPreferencesFromResource(R.xml.settings_wifi);} else if ("sync".equals(settings)) {addPreferencesFromResource(R.xml.settings_sync);}}
}

public class SettingsActivity extends PreferenceActivity {@Overridepublic void onBuildHeaders(List<Header> target) {loadHeadersFromResource(R.xml.preference_headers, target);}
}

<preference-headers xmlns:android="http://schemas.android.com/apk/res/android"><header android:fragment="com.example.prefs.SettingsFragmentOne"android:title="@string/prefs_category_one"android:summary="@string/prefs_summ_category_one" /><header android:fragment="com.example.prefs.SettingsFragmentTwo"android:title="@string/prefs_category_two"android:summary="@string/prefs_summ_category_two" />
</preference-headers>

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"><Preference android:title="@string/prefs_category_one"android:summary="@string/prefs_summ_category_one"  ><intent android:targetPackage="com.example.prefs"android:targetClass="com.example.prefs.SettingsActivity"android:action="com.example.prefs.PREFS_ONE" /></Preference><Preference android:title="@string/prefs_category_two"android:summary="@string/prefs_summ_category_two" ><intent android:targetPackage="com.example.prefs"android:targetClass="com.example.prefs.SettingsActivity"android:action="com.example.prefs.PREFS_TWO" /></Preference>
</PreferenceScreen>

@Override
public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);...if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {//低于3.0版本载入legacy preferences headers
        addPreferencesFromResource(R.xml.preference_headers_legacy);}
}// 高于或等于3.0版本会调用此方法
@Override
public void onBuildHeaders(List<Header> target) {loadHeadersFromResource(R.xml.preference_headers, target);
}

final static String ACTION_PREFS_ONE = "com.example.prefs.PREFS_ONE";
...@Override
public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);String action = getIntent().getAction();if (action != null && action.equals(ACTION_PREFS_ONE)) {addPreferencesFromResource(R.xml.preferences);}...else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {// 载入3.0以下版本的legacy preferences文件
        addPreferencesFromResource(R.xml.preference_headers_legacy);}
}

SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
String syncConnPref = sharedPref.getString(SettingsActivity.KEY_PREF_SYNC_CONN, "");

public class SettingsActivity extends PreferenceActivityimplements OnSharedPreferenceChangeListener {public static final String KEY_PREF_SYNC_CONN = "pref_syncConnectionType";...public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {if (key.equals(KEY_PREF_SYNC_CONN)) {Preference connectionPref = findPreference(key);// 为选中的值设置用户描述摘要。connectionPref.setSummary(sharedPreferences.getString(key, ""));}}
}

@Override
protected void onResume() {super.onResume();getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}@Override
protected void onPause() {super.onPause();getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}

<activity android:name="SettingsActivity" ... ><intent-filter><action android:name="android.intent.action.MANAGE_NETWORK_USAGE" /><category android:name="android.intent.category.DEFAULT" /></intent-filter>
</activity>

public class NumberPickerPreference extends DialogPreference {public NumberPickerPreference(Context context, AttributeSet attrs) {super(context, attrs);setDialogLayoutResource(R.layout.numberpicker_dialog);setPositiveButtonText(android.R.string.ok);setNegativeButtonText(android.R.string.cancel);setDialogIcon(null);}...
}

@Override
protected void onDialogClosed(boolean positiveResult) {// 当用户选择OK时，保存新的值if (positiveResult) {persistInt(mNewValue);}
}

@Override
protected void onSetInitialValue(boolean restorePersistedValue, Object defaultValue) {if (restorePersistedValue) {// 恢复状态mCurrentValue = this.getPersistedInt(DEFAULT_VALUE);} else {// 从xml属性中设置默认状态mCurrentValue = (Integer) defaultValue;persistInt(mCurrentValue);}
}

private static class SavedState extends BaseSavedState {int value;public SavedState(Parcelable superState) {super(superState);}public SavedState(Parcel source) {super(source);// 获得当前preference的值value = source.readInt();  }@Overridepublic void writeToParcel(Parcel dest, int flags) {super.writeToParcel(dest, flags);// 写入preference的值
        dest.writeInt(value);  }public static final Parcelable.Creator<SavedState> CREATOR =new Parcelable.Creator<SavedState>() {public SavedState createFromParcel(Parcel in) {return new SavedState(in);}public SavedState[] newArray(int size) {return new SavedState[size];}};
}

@Override
protected Parcelable onSaveInstanceState() {final Parcelable superState = super.onSaveInstanceState();// 检查Preference是否被保存过if (isPersistent()) {//不需要保存实例状态,因为它是持久化的,使用父类状态return superState;}// 创建自定义的BaseSavedState实例final SavedState myState = new SavedState(superState);// 使用类成员变量赋值myState.value = mNewValue;return myState;
}@Override
protected void onRestoreInstanceState(Parcelable state) {//检查我们在onSaveInstanceState中是否保存过状态if (state == null || !state.getClass().equals(SavedState.class)) {// 没有保存状态，调用父类的方法super.onRestoreInstanceState(state);return;}// 强制转换到自定义的BaseSavedStateSavedState myState = (SavedState) state;super.onRestoreInstanceState(myState.getSuperState());// 应用它的值到UI，以恢复UI状态
    mNumberPicker.setValue(myState.value);
}