public class SharedPrefUtility {

    private static final String FILE_NAME = "share_date";

    public static final String INDEX="index";
    public static final String LOGIN_DATA="loginData";
    public static final String IS_LOGIN="isLogin";


    /**
     * save data into FILE_NAME ,this path is data/data/POCKET_NAME/shared_prefs
 
     * @param context
     * @param key
     * @param object
     */
    public static void setParam(Context context , String key, Object object){

        String type = object.getClass().getSimpleName();
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        
 
SharedPreferences.Editor editor = sp.edit();

        if("String".equals(type)){
            editor.putString(key, (String)object);
        }
        else if("Integer".equals(type)){
            editor.putInt(key, (Integer)object);
        }
        else if("Boolean".equals(type)){
            editor.putBoolean(key, 
 
(Boolean)object);
        }
        else if("Float".equals(type)){
            editor.putFloat(key, (Float)object);
        }
        else if("Long".equals(type)){
            editor.putLong(key, (Long)object);
        }

        editor.apply();
    }


    /**
     * get value via enter key
     * @param context
     * @param key
     * @param defaultObject
     * @return
     */
    public static Object getParam(Context context , String key, Object defaultObject){
        String type = defaultObject.getClass().getSimpleName();
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);

        if("String".equals(type)){
            return sp.getString(key, (String)defaultObject);
        }
        else if("Integer".equals(type)){
            return sp.getInt(key, (Integer)defaultObject);
        }
        else if("Boolean".equals(type)){
            return sp.getBoolean(key, (Boolean)defaultObject);
        }
        else if("Float".equals(type)){
            return sp.getFloat(key, (Float)defaultObject);
        }
        else if("Long".equals(type)){
            return sp.getLong(key, (Long)defaultObject);
        }

        return null;
    }

    /**
     * delete key
     * @param context
     * @param key
     */
    public static void removeParam(Context context,String key){
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(key);
        editor.apply();
    }

}

建立一個Utils

然後 呼叫判斷是否登入

isLogin=(Boolean) SharedPrefUtility.getParam(getActivity(), SharedPrefUtility.IS_LOGIN, false);

儲存登入狀態:

//儲存登入狀態
SharedPrefUtility.setParam(LoginActivity.this, SharedPrefUtility.IS_LOGIN, true);
//儲存登入個人資訊
SharedPrefUtility.setParam(LoginActivity .this, SharedPrefUtility.LOGIN_DATA, result);

退出登入:

SharedPrefUtility.setParam(MySettingsActivity.this, SharedPrefUtility.IS_LOGIN, false);
SharedPrefUtility.removeParam(MySettingsActivity.this, SharedPrefUtility.LOGIN_DATA);

這就是簡單的sp儲存登入狀態以及退出登入