[Android UI] ListPreference 动态改变Summary

首先该类实现OnSharedPreferenceChangeListener 接口

onCreate方法中进行注册

 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

 prefs.registerOnSharedPreferenceChangeListener(this);

重写onSharedPreferenceChanged 方法

1.  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {  
2.         // Let's do something a preference value changes  
3. if (key.equals(KEY_LIST_PREFERENCE)) {  
4.           mListPreference.setSummary("Current value is " + sharedPreferences.getValue(key, ""));   
5.         }  
6. }  

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以下是我的代码，我没时间整理代码，大家将就的看吧，有问题提问。我想我应该说清楚流程了."color"为listpreference的key

package com.h3c.AndVNC;import android.content.SharedPreferences;import android.content.SharedPreferences.OnSharedPreferenceChangeListener;import android.os.Bundle;import android.preference.EditTextPreference;import android.preference.ListPreference;import android.preference.Preference;import android.preference.PreferenceActivity;import android.preference.PreferenceManager;import android.preference.Preference.OnPreferenceChangeListener;import android.preference.Preference.OnPreferenceClickListener;import android.widget.Toast;public class SettingPage extends PreferenceActivity implements OnPreferenceChangeListener,   OnPreferenceClickListener,OnSharedPreferenceChangeListener {ListPreference lp;EditTextPreference et;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);addPreferencesFromResource(R.xml.preferences);lp = (ListPreference)findPreference("color");et = (EditTextPreference)findPreference("repeater");lp.setSummary(lp.getEntry());et.setSummary(et.getText());SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);        prefs.registerOnSharedPreferenceChangeListener(this); //lp.setOnPreferenceChangeListener(this);//lp.setOnPreferenceClickListener(this);}@Overridepublic boolean onPreferenceChange(Preference preference, Object newValue) {// TODO Auto-generated method stubif(preference.getKey().equals("color"))          { Toast.makeText(SettingPage.this,"s"+lp.getEntry(), Toast.LENGTH_SHORT).show();//lp.setSummary(lp.getEntry());        }return true;}@Overridepublic boolean onPreferenceClick(Preference preference) {// TODO Auto-generated method stubif(preference.getKey().equals("color"))          { //lp.setSummary(lp.getEntry());Toast.makeText(SettingPage.this,lp.getEntry(), Toast.LENGTH_SHORT).show();        }return false;}@Overridepublic void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {// TODO Auto-generated method stubif(key.equals("color")){lp.setSummary(lp.getEntry());}if(key.equals("repeater")){et.setSummary(et.getText());}} }