PreferenceActivity使用示例

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>