Android下PreferenceActivity使用示例，,MainActivity

Android下PreferenceActivity使用示例，,MainActivity

MainActivity如下:

package cn.testpreferenceactivity;import android.content.SharedPreferences;import android.os.Bundle;import android.preference.CheckBoxPreference;import android.preference.ListPreference;import android.preference.Preference;import android.preference.Preference.OnPreferenceChangeListener;import android.preference.Preference.OnPreferenceClickListener;import android.preference.PreferenceActivity;import android.preference.PreferenceManager;/** * Demo描述: * PreferenceActivity的使用示例 *  * 注意事项: * 1 不要ListPreference的属性android:dialogMessage *   若设置则无法弹出选择列表. *   这和单选,多选对话框类似不能设置其Message. * 2 不要ListPreference的属性android:positiveButtonText *   即使设置也无效 * 3 注意ListPreference的默认值的设定 *   android:defaultValue="222" *   该值必须是 android:entryValues="@array/values_array" *   这个数组中包含的值!!!!!!!!!!!!! *    *    * 参考资料: * 1 http://www.cnblogs.com/adm1989/archive/2012/08/01/2618403.html * 2 http://www.eoeandroid.com/forum.php?mod=viewthread&tid=188859 *   Thank you very much */public class MainActivity extends PreferenceActivity {   private CheckBoxPreference mCheckBoxPreference;   private ListPreference mListPreference;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.preferenceactivity);        init();    }    private void init(){        mCheckBoxPreference=        (CheckBoxPreference) findPreference(getResources().getString(R.string.first_key));        mCheckBoxPreference.setOnPreferenceChangeListener(new PreferenceChangeListenerImpl());        mCheckBoxPreference.setOnPreferenceClickListener(new PreferenceClickListenerImpl());        mListPreference=        (ListPreference) findPreference(getResources().getString(R.string.listpreference_key));        mListPreference.setOnPreferenceChangeListener(new PreferenceChangeListenerImpl());        mListPreference.setOnPreferenceClickListener(new PreferenceClickListenerImpl());    }    private class PreferenceClickListenerImpl implements OnPreferenceClickListener{        @Override        public boolean onPreferenceClick(Preference preference) {            String preferenceKey=preference.getKey().toString();            if (preferenceKey.equals(getResources().getString(R.string.first_key))) {                System.out.println("点击了CheckBoxPreference");            }            if (preferenceKey.equals(getResources().getString(R.string.listpreference_key))) {                System.out.println("点击了ListPreference");            }            return true;        }    }    /**     * 注意事项:     * 在OnPreferenceChangeListener的onPreferenceChange()     * 可知改变后的值,但该值还未真正存入尚在内存中贮存.     * 所以此时调用getValuesFromSP得到的只是改变前的值.     *     */    private class  PreferenceChangeListenerImpl implements OnPreferenceChangeListener{        @Override        public boolean onPreferenceChange(Preference preference, Object newValue) {            String preferenceKey=preference.getKey().toString();            if (preferenceKey.equals(getResources().getString(R.string.first_key))) {                System.out.println("切换后值为:"+newValue.toString());            }            if (preferenceKey.equals(getResources().getString(R.string.listpreference_key))) {                System.out.println("切换后值为:"+newValue.toString());            }            return true;        }    }    @Override    public void onBackPressed() {        getValuesFromSP();        super.onBackPressed();    }    // 从PreferenceActivity的SharedPreferences中取数据    private void getValuesFromSP(){        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);        Boolean first_value = sp.getBoolean(getResources().getString(R.string.first_key), false);        String listpreference_key = sp.getString(getResources().getString(R.string.listpreference_key), null);        System.out.println("从SharedPreferences中取出的是:" + first_value);        System.out.println("从SharedPreferences中取出的是:" + listpreference_key);    }}

                                preferenceactivity.xml如下:

<?xml version="1.0" encoding="utf-8"?><PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >    <CheckBoxPreference        android:key="@string/first_key"        android:summary="@string/first_default"        android:summaryOff="@string/first_off"        android:summaryOn="@string/first_on"        android:title="@string/first_title"     />    <ListPreference        android:dialogIcon="@drawable/ic_launcher"        android:dialogTitle="@string/listpreference_title"        android:entries="@array/names_array"        android:entryValues="@array/values_array"        android:key="@string/listpreference_key"        android:negativeButtonText="@string/listpreference_no"        android:summary="@string/listpreference_summary"        android:title="@string/listpreference_title"        android:defaultValue="222"    /></PreferenceScreen>

                                strings.xml如下:

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">TestPreferenceActivity</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="first_key">first_key</string>    <string name="first_on">first_on</string>    <string name="first_off">first_off</string>    <string name="first_title">first_title</string>    <string name="first_default">first_default</string>    <string name="listpreference_key">listpreference_key</string>    <string name="listpreference_title">listpreference_title</string>    <string name="listpreference_summary">listpreference_summary</string>    <string name="listpreference_message">listpreference_message</string>    <string name="listpreference_ok">OK</string>    <string name="listpreference_no">NO</string></resources>