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 + "" + "	";
//                }
//
//                Set<String> values = mMultiSelectListPreference.getValues();
//                Iterator<String> it = values.iterator();
//                String s_values = "values:";
//                while (it.hasNext()) {
//                    s_values += it.next().toString() + "	";
//                }
//                mMultiSelectListPreference.setSummary(s_entries + "
" + 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