GreenDao

先把GreenDao的环境配置好

1、在工程的buildgradle中导入

   dependencies {
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'
        
    }
2、在项目的buildgradle中导入


//导入插件
apply plugin: 'org.greenrobot.greendao' // apply plugin


//在dependencies中添加如下代码
dependencies {
  
    compile 'org.greenrobot:greendao:3.2.2' // add library

}

可以写一个单例类用来创建数据库

public class Utils {
    private static Utils utils;
    private DaoSession daoSession;
    private BeanDao BeanDao;

   public static Utils ss(){
        if(utils==null) {
            utils = new Utils();

        }
        return utils;
    }
    public BeanDao Beans(Context context){

        DaoMaster.DevOpenHelper openHelper = new DaoMaster.DevOpenHelper(context.getApplicationContext(), "sssss", null);
        SQLiteDatabase db = openHelper.getWritableDatabase();
        DaoMaster mDaoMaster = new DaoMaster(db);
        daoSession = mDaoMaster.newSession();
        BeanDao = daoSession.getBeanDao();
        return BeanDao;
    }
}

插入数据

Utils utils=Utils.ss();
  beans = utils.Beans(MainActivity1.this);
  int[] a={R.drawable.w,R.drawable.a,R.drawable.s,R.drawable.x};
  beans.insert(new Bean(null,a[0],"西游记","吴承恩"));
  beans.insert(new Bean(null,a[1],"三国演义","罗贯中"));
  beans.insert(new Bean(null,a[2],"红楼梦","曹雪芹"));
  beans.insert(new Bean(null,a[3],"水浒传","施耐庵"));

查询数据

Utils utils=Utils.ss();
beans = utils.Beans(MainActivity1.this);
List<Bean> lists = beans.queryBuilder().list();
list.addAll(lists);

删除所有

Utils utils=Utils.ss();
beans = utils.Beans(MainActivity1.this);
beans.deleteAll();