spUtil
/**
 * Created by daydreamty on 2017/4/7.
 *
 * @description: SharedPreference工具类
 */

public class SpUtil{
    private static final String SP_KEY = "";//你的key名

    public static void putString(Context ctx, String key, String value) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        sp.edit().putString(key, value).apply();
    }

    public static String getString(Context ctx, String key, String defaultvalue) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        return sp.getString(key, defaultvalue);
    }

    public static void putInt(Context ctx, String key, int value) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        sp.edit().putInt(key, value).apply();
    }

    public static int getInt(Context ctx, String key, int defaultvalue) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        return sp.getInt(key, defaultvalue);
    }

    public static void putBoolean(Context ctx, String key, Boolean value) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        sp.edit().putBoolean(key, value).apply();
    }

    public static Boolean getBoolean(Context ctx, String key, Boolean defaultvalue) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        return sp.getBoolean(key, defaultvalue);
    }

    public static void remove(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        sp.edit().remove(key).apply();
    }

    public static void removeAll(Context ctx) {
        SharedPreferences sp = ctx.getSharedPreferences(SP_KEY, Context.MODE_PRIVATE);
        sp.edit().clear().apply();
    }

}

GsonUtil

/**
 * Created by daydr on 2017/5/5.
 *
 * @description: Gson工具
 */

public class GsonUtil {
    private static Gson gson = null;

    static {
        if (gson == null) {
            gson = new Gson();
        }
    }

    private GsonUtil() {
    }

    /**
     * 转成json
     *
     * @param object 待转换的对象
     * @return 返回值
     */
    public static String GsonString(Object object) {
        String gsonString = null;
        if (gson != null) {
            gsonString = gson.toJson(object);
        }
        return gsonString;
    }

    /**
     * 转成bean
     *
     * @param gsonString 待转换的json
     * @param cls        Bean.class
     * @return 返回值
     */
    public static <T> T GsonToBean(String gsonString, Class<T> cls) {
        T t = null;
        if (gson != null) {
            t = gson.fromJson(gsonString, cls);
        }
        return t;
    }

    /**
     * 转成list
     *
     * @param gsonString 待转换的json
     * @param cls        转换的目标
     * @return 返回值
     */
    public static <T> List<T> GsonToList(String gsonString, Class<T> cls) {
        List<T> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString, new TypeToken<List<T>>() {
            }.getType());
        }
        return list;
    }

    /**
     * 转成list中有map的
     *
     * @param gsonString 待转换的json
     * @return 返回值
     */
    public static <T> List<Map<String, T>> GsonToListMaps(String gsonString) {
        List<Map<String, T>> list = null;
        if (gson != null) {
            list = gson.fromJson(gsonString,
                    new TypeToken<List<Map<String, T>>>() {
                    }.getType());
        }
        return list;
    }

    /**
     * 转成map的
     *
     * @param gsonString 待转换的json
     * @return 返回值
     */
    public static <T> Map<String, T> GsonToMaps(String gsonString) {
        Map<String, T> map = null;
        if (gson != null) {
            map = gson.fromJson(gsonString, new TypeToken<Map<String, T>>() {
            }.getType());
        }
        return map;
    }
}

VersionUtil

/**
 * Created by daydreamty on 2017/11/13.
 *
 * @description 版本检测util
 */

public class VersionUtil {
    // 以下是获得版本信息的工具方法
    //版本名
    public static String getVersionName(Context context) {
        return getPackageInfo(context).versionName;
    }

    //版本号
    public int getVersionCode(Context context) {
        return getPackageInfo(context).versionCode;
    }

    private static PackageInfo getPackageInfo(Context context) {
        PackageInfo pi = null;
        try {
            PackageManager pm = context.getPackageManager();
            pi = pm.getPackageInfo(context.getPackageName(),
                    PackageManager.GET_CONFIGURATIONS);

            return pi;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return pi;
    }