SharedPreferences 安卓工具类，, import j

SharedPreferences 安卓工具类，, import j

    import java.lang.reflect.InvocationTargetException;      import java.lang.reflect.Method;      import java.util.Map;      import android.content.Context;      import android.content.SharedPreferences;      public class SPUtils      {          public SPUtils()          {              /* cannot be instantiated */              throw new UnsupportedOperationException("cannot be instantiated");          }          /**          * 保存在手机里面的文件名          */          public static final String FILE_NAME = "share_data";          /**          * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法          *           * @param context          * @param key          * @param object          */          public static void put(Context context, String key, Object object)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              SharedPreferences.Editor editor = sp.edit();              if (object instanceof String)              {                  editor.putString(key, (String) object);              } else if (object instanceof Integer)              {                  editor.putInt(key, (Integer) object);              } else if (object instanceof Boolean)              {                  editor.putBoolean(key, (Boolean) object);              } else if (object instanceof Float)              {                  editor.putFloat(key, (Float) object);              } else if (object instanceof Long)              {                  editor.putLong(key, (Long) object);              } else              {                  editor.putString(key, object.toString());              }              SharedPreferencesCompat.apply(editor);          }          /**          * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值          *           * @param context          * @param key          * @param defaultObject          * @return          */          public static Object get(Context context, String key, Object defaultObject)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              if (defaultObject instanceof String)              {                  return sp.getString(key, (String) defaultObject);              } else if (defaultObject instanceof Integer)              {                  return sp.getInt(key, (Integer) defaultObject);              } else if (defaultObject instanceof Boolean)              {                  return sp.getBoolean(key, (Boolean) defaultObject);              } else if (defaultObject instanceof Float)              {                  return sp.getFloat(key, (Float) defaultObject);              } else if (defaultObject instanceof Long)              {                  return sp.getLong(key, (Long) defaultObject);              }              return null;          }          /**          * 移除某个key值已经对应的值          *           * @param context          * @param key          */          public static void remove(Context context, String key)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              SharedPreferences.Editor editor = sp.edit();              editor.remove(key);              SharedPreferencesCompat.apply(editor);          }          /**          * 清除所有数据          *           * @param context          */          public static void clear(Context context)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              SharedPreferences.Editor editor = sp.edit();              editor.clear();              SharedPreferencesCompat.apply(editor);          }          /**          * 查询某个key是否已经存在          *           * @param context          * @param key          * @return          */          public static boolean contains(Context context, String key)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              return sp.contains(key);          }          /**          * 返回所有的键值对          *           * @param context          * @return          */          public static Map<String, ?> getAll(Context context)          {              SharedPreferences sp = context.getSharedPreferences(FILE_NAME,                      Context.MODE_PRIVATE);              return sp.getAll();          }          /**          * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类          *           * @author zhy          *           */          private static class SharedPreferencesCompat          {              private static final Method sApplyMethod = findApplyMethod();              /**              * 反射查找apply的方法              *               * @return              */              @SuppressWarnings({ "unchecked", "rawtypes" })              private static Method findApplyMethod()              {                  try                  {                      Class clz = SharedPreferences.Editor.class;                      return clz.getMethod("apply");                  } catch (NoSuchMethodException e)                  {                  }                  return null;              }              /**              * 如果找到则使用apply执行，否则使用commit              *               * @param editor              */              public static void apply(SharedPreferences.Editor editor)              {                  try                  {                      if (sApplyMethod != null)                      {                          sApplyMethod.invoke(editor);                          return;                      }                  } catch (IllegalArgumentException e)                  {                  } catch (IllegalAccessException e)                  {                  } catch (InvocationTargetException e)                  {                  }                  editor.commit();              }          }      }