Android之SharedPreferences两个工具类

     相信Android的这个最简单的存储方式大家都很熟悉了，但是有一个小小技巧，也许你没有用过，今天就跟大家分享一下，我们可以把SharedPreferences封装在一个工具类中，当我们需要写数据和读数据的时候，就可以直接通过工具类的set和get方法来完成，类似JavaBean，这样使用起来就比较方便，快捷（建议项目中使用次数比较多使用）。好了，直接看看这段简单的代码吧：

 public class SharePreferenceUtil {
     private SharedPreferences sp;
     private SharedPreferences.Editor editor;

     public SharePreferenceUtil(Context context, String file) {
         sp = context.getSharedPreferences(file, context.MODE_PRIVATE);
         editor = sp.edit();
     }

     // 用户的密码
     public void setPasswd(String passwd) {
         editor.putString("passwd", passwd);
         editor.commit();
     }

     public String getPasswd() {
         return sp.getString("passwd", "");
     }

     // 用户的id，即QQ号
     public void setId(String id) {
         editor.putString("id", id);
         editor.commit();
     }

     public String getId() {
         return sp.getString("id", "");
     }

     // 用户的昵称
     public String getName() {
         return sp.getString("name", "");
     }

     public void setName(String name) {
         editor.putString("name", name);
         editor.commit();
     }

     // 用户的邮箱
     public String getEmail() {
         return sp.getString("email", "");
     }

     public void setEmail(String email) {
         editor.putString("email", email);
         editor.commit();
     }

     // 用户自己的头像
     public Integer getImg() {
         return sp.getInt("img", 0);
     }

     public void setImg(int i) {
         editor.putInt("img", i);
         editor.commit();
     }

     // ip
     public void setIp(String ip) {
         editor.putString("ip", ip);
         editor.commit();
     }

     public String getIp() {
         return sp.getString("ip", Constants.SERVER_IP);
     }

     // 端口
     public void setPort(int port) {
         editor.putInt("port", port);
         editor.commit();
     }

     public int getPort() {
         return sp.getInt("port", Constants.SERVER_PORT);
     }

     // 是否在后台运行标记
     public void setIsStart(boolean isStart) {
         editor.putBoolean("isStart", isStart);
         editor.commit();
     }

     public boolean getIsStart() {
         return sp.getBoolean("isStart", false);
     }

     // 是否第一次运行本应用
     public void setIsFirst(boolean isFirst) {
         editor.putBoolean("isFirst", isFirst);
         editor.commit();
     }

     public boolean getisFirst() {
         return sp.getBoolean("isFirst", true);
     }
 }

第二种方法是更加简单方便：取值时只用传入context和对应的key，就能获取到对应的value；设值时，也是传入context和对应key和value即可，非常方便实用。

 public class PreferenceUtils {
     public static String getPrefString(Context context, String key,
             final String defaultValue) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         return settings.getString(key, defaultValue);
     }

     public static void setPrefString(Context context, final String key,
             final String value) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         settings.edit().putString(key, value).commit();
     }

     public static boolean getPrefBoolean(Context context, final String key,
             final boolean defaultValue) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         return settings.getBoolean(key, defaultValue);
     }

     public static boolean hasKey(Context context, final String key) {
         return PreferenceManager.getDefaultSharedPreferences(context).contains(
                 key);
     }

     public static void setPrefBoolean(Context context, final String key,
             final boolean value) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         settings.edit().putBoolean(key, value).commit();
     }

     public static void setPrefInt(Context context, final String key,
             final int value) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         settings.edit().putInt(key, value).commit();
     }

     public static int getPrefInt(Context context, final String key,
             final int defaultValue) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         return settings.getInt(key, defaultValue);
     }

     public static void setPrefFloat(Context context, final String key,
             final float value) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         settings.edit().putFloat(key, value).commit();
     }

     public static float getPrefFloat(Context context, final String key,
             final float defaultValue) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         return settings.getFloat(key, defaultValue);
     }

     public static void setSettingLong(Context context, final String key,
             final long value) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         settings.edit().putLong(key, value).commit();
     }

     public static long getPrefLong(Context context, final String key,
             final long defaultValue) {
         final SharedPreferences settings = PreferenceManager
                 .getDefaultSharedPreferences(context);
         return settings.getLong(key, defaultValue);
     }

     public static void clearPreference(Context context,
             final SharedPreferences p) {
         final Editor editor = p.edit();
         editor.clear();
         editor.commit();
     }
 }