seeting菜单界面形成--优化

本文是上一篇文章的优化版：

上文链接地址：http://www.cnblogs.com/zzw1994/p/5016864.html

上文中有很多方法都是过时，并且效率不是很高,主要对JAVA代码进行了优化，下面是优化后的代码：

MainActivity.java：

 package com.zzw.testpreferenceactivity;

 import android.app.Activity;
 import android.os.Bundle;

 public class MainActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         this.getFragmentManager().beginTransaction()
         .replace(android.R.id.content, new SettingFragment()).commit();
     }

 }

SettingFragment.java：

 package com.zzw.testpreferenceactivity;

 import java.util.Iterator;
 import java.util.Set;

 import android.content.SharedPreferences;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.os.Bundle;
 import android.preference.CheckBoxPreference;
 import android.preference.EditTextPreference;
 import android.preference.ListPreference;
 import android.preference.MultiSelectListPreference;
 import android.preference.PreferenceFragment;
 import android.preference.PreferenceManager;
 import android.preference.SwitchPreference;
 import android.widget.Toast;

 public class SettingFragment extends PreferenceFragment {

     private final String CHECKBOXPREFERENCE_KEY1 = "checkbox_key1";
     private final String EDITTEXTPREFERENCE_KEY1 = "edit_key1";
     private final String LISTPREFERENCE_KEY = "listPreferenc_key";
     private final String MULTISELECTLISTPREFERENCE_KEY = "multiSelectListPreference_key";
     private final String SWITCHPREFERENCE_KEY = "switchPreference_key1";

     private SharedPreferences mSharedPreferences;
     private OnSharedPreferenceChangeListener mOnSharedPreferenceChangeListener;

     private CheckBoxPreference mCheckBoxPreference;
     private EditTextPreference mEditTextPreference;
     private ListPreference mListPreference;
     private MultiSelectListPreference mMultiSelectListPreference;
     private SwitchPreference mSwitchPreference;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         // 添加设置的选项
         addPreferencesFromResource(R.xml.first_preference);

         mCheckBoxPreference = (CheckBoxPreference) findPreference(CHECKBOXPREFERENCE_KEY1);
         mEditTextPreference = (EditTextPreference) findPreference(EDITTEXTPREFERENCE_KEY1);
         mListPreference = (ListPreference) findPreference(LISTPREFERENCE_KEY);
         mMultiSelectListPreference = (MultiSelectListPreference) findPreference(MULTISELECTLISTPREFERENCE_KEY);
         mSwitchPreference = (SwitchPreference) findPreference(SWITCHPREFERENCE_KEY);

         // 获取SharedPreferences对象
         mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());

         // 通用的读取设置的某个值的方法
         // boolean b = mSharedPreferences.getBoolean("checkbox_key1", false);
         // Log.d("checkbox_key1", b+"");
         //
         // String s = mSharedPreferences.getString("edit_key1", "暂时为空");
         // Log.d("edit_key1", s);

         mOnSharedPreferenceChangeListener = new MyOnSharedPreferenceChangeListener();
     }

     // 数据发生变化时候的监听类设置
     private class MyOnSharedPreferenceChangeListener implements OnSharedPreferenceChangeListener {

         @Override
         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
             switch (key) {
             case CHECKBOXPREFERENCE_KEY1:

                 boolean b = sharedPreferences.getBoolean(CHECKBOXPREFERENCE_KEY1, false);
                 mCheckBoxPreference.setSummary(b + "");
                 break;

             case EDITTEXTPREFERENCE_KEY1:

                 String s = sharedPreferences.getString(EDITTEXTPREFERENCE_KEY1, "null");
                 mEditTextPreference.setSummary(s);
                 break;

             case LISTPREFERENCE_KEY:

                 String e = mListPreference.getEntry() + "";
                 String v = mListPreference.getValue();
                 mListPreference.setSummary(e + " : " + v);
                 break;

             case MULTISELECTLISTPREFERENCE_KEY:

 //                String s_entries = "entries:";
 //
 //                CharSequence[] entries = mMultiSelectListPreference.getEntries();
 //                for (CharSequence c : entries) {
 //                    s_entries += c + "" + "\t";
 //                }
 //
 //                Set<String> values = mMultiSelectListPreference.getValues();
 //                Iterator<String> it = values.iterator();
 //                String s_values = "values:";
 //                while (it.hasNext()) {
 //                    s_values += it.next().toString() + "\t";
 //                }
 //                mMultiSelectListPreference.setSummary(s_entries + "\n" + s_values);
                 break;

             case SWITCHPREFERENCE_KEY:

                 boolean boo = sharedPreferences.getBoolean(SWITCHPREFERENCE_KEY, false);
                 mSwitchPreference.setSummary(boo + "");

                 break;
             default:
                 break;
             }
         }
     }

     @Override
     public void onResume() {
         super.onResume();
         // 注册数据发生变化时候的监听
         mSharedPreferences.registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
         // getPreferenceScreen().getSharedPreferences()
         // .registerOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
     }

     @Override
     public void onPause() {
         super.onPause();
         // 取消数据发生变化时候的监听
         mSharedPreferences.unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
         // getPreferenceScreen().getSharedPreferences()
         // .unregisterOnSharedPreferenceChangeListener(mOnSharedPreferenceChangeListener);
     }
 }

主要优化的地方有：①、使用了switch，提高了效率（Jdk1.7以上，包括1.7）

　　　　　　　　　②、把seeting菜单改变时的监听提取了出来，降低了代码的耦合度