工具类

1.GreenDao工具类

public class DbUtil {
    private volatile static DbUtil dbUtil;
    private DailyNewsDbBeanDao dailyNewsDbBeanDao;

    public static DbUtil getDbUtil() {
        if (dbUtil == null) {
            synchronized (DbUtil.class) {
                if (dbUtil == null) {
                    dbUtil = new DbUtil();
                }
            }
        }
        return dbUtil;
    }

    private DbUtil() {
        //1.创建数据库
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(BaseApplication.getApplication(), "news.db");
        //2.获取读写对象
        DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());
        //3.获取管理器类
        DaoSession daoSession = daoMaster.newSession();
        //4.获取表对象
        dailyNewsDbBeanDao = daoSession.getDailyNewsDbBeanDao();
    }

    /**
     * 查询全部数据
     *
     * @return
     */
    public List<DailyNewsDbBean> query() {
        return dailyNewsDbBeanDao.queryBuilder().list();
    }

    /**
     * 插入一条数据
     *
     * @param dailyNewsDbBean
     * @return
     */
    public long insert(DailyNewsDbBean dailyNewsDbBean) {
        if (!isHash(dailyNewsDbBean)) {
            long l = dailyNewsDbBeanDao.insertOrReplace(dailyNewsDbBean);
            return l;
        }
        return -1;
    }

    /**
     * 删除一条数据
     *
     * @param dailyNewsDbBean
     * @return
     */
    public boolean delete(DailyNewsDbBean dailyNewsDbBean) {
        if (isHash(dailyNewsDbBean)) {
            dailyNewsDbBeanDao.delete(dailyNewsDbBean);
            return true;
        }
        return false;
    } 

    /**
     * 修改一条数据
     *
     * @param dailyNewsDbBean
     * @return
     */
    public boolean updata(DailyNewsDbBean dailyNewsDbBean) {
        if (isHash(dailyNewsDbBean)) {
            dailyNewsDbBeanDao.update(dailyNewsDbBean);
            return true;
        }
        return false;
    }

    /**
     * 查询对应的题目和id
     *
     * @param dailyNewsDbBean
     * @return
     */
    public List<DailyNewsDbBean> queryStudent(DailyNewsDbBean dailyNewsDbBean) {
        return dailyNewsDbBeanDao.queryBuilder().where(DailyNewsDbBeanDao.Properties.Title.eq(dailyNewsDbBean.getTitle()), DailyNewsDbBeanDao.Properties.Id.gt(dailyNewsDbBean.getId())).list();
    }

    /**
     * 查询多少页
     *
     * @param page
     * @param count
     * @return
     */
    public List<DailyNewsDbBean> queryPage(int page, int count) {
        return dailyNewsDbBeanDao.queryBuilder().offset(page * count).limit(count).list();
    }

    /**
     * 模糊查询
     *
     * @param info
     * @return
     */
    public List<DailyNewsDbBean> querLike(String info) {
        List<DailyNewsDbBean> list = dailyNewsDbBeanDao.queryBuilder().where(DailyNewsDbBeanDao.Properties.Title.like("%" + student + "%")).list();
        return list;
    }


    /**
     * 判断是否存在
     *
     * @param dailyNewsDbBean
     * @return
     */
    public boolean isHash(DailyNewsDbBean dailyNewsDbBean) {
        List<DailyNewsDbBean> list = dailyNewsDbBeanDao.queryBuilder().where(DailyNewsDbBeanDao.Properties.Id.eq(dailyNewsDbBean.getId())).list();
        if (list != null && list.size() > 0) {
            return true;
        }
        return false;
    }
}

2.SharedPreferencesUtil

public class SharedPreferencesUtil {
    /**
     * 保存在手机里面的文件名
     */
    private static final String FILE_NAME = "share_date";


    /**
     * 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 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.commit();
    }

    /**
     * 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 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;
    }
}

3. 线程池

public class ThreadManager {
    private static ThreadManager mManager;
    private final ThreadPoolExecutor mExecutor;
    private ThreadManager(){
        mExecutor = new ThreadPoolExecutor(5,//核心线程数量,核心池的大小
                20,//线程池最大线程数
                30,//表示线程没有任务执行时最多保持多久时间会终止
                TimeUnit.SECONDS,//时间单位
                new LinkedBlockingQueue<Runnable>(),//任务队列,用来存储等待执行的任务
                Executors.defaultThreadFactory(),//线程工厂,如何去创建线程的
                new ThreadPoolExecutor.AbortPolicy());
    }
    public static ThreadManager getInstance(){
        if (mManager == null){
            synchronized (ThreadManager.class){
                if (mManager == null){
                    mManager = new ThreadManager();
                }
            }
        }
        return mManager;
    }

    /**
     * 执行任务
     */
    public void execute(Runnable runnable){
        if(runnable==null)return;

        mExecutor.execute(runnable);
    }
    /**
     * 从线程池中移除任务
     */
    public void remove(Runnable runnable){
        if(runnable==null)return;
        mExecutor.remove(runnable);
    }
}