xutils保存数据库

app类；
public class App extends Application{
    private DbManager.DaoConfig daoConfig;
    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);
        x.Ext.setDebug(BuildConfig.DEBUG);
        //创建数据库
        daoConfig = new DbManager.DaoConfig()
                //数据库名字
                .setDbName("yw.db")
                //数据集的版本
                .setDbVersion(1)
                //是否开启事物
                .setAllowTransaction(true)
                //创建表的监听
                .setTableCreateListener(new DbManager.TableCreateListener() {
                    @Override
                    public void onTableCreated(DbManager db, TableEntity<?> table) {
                        Toast.makeText(App.this, table.getName(), Toast.LENGTH_SHORT).show();
                    }
                })
                //数据库打开的监听
                .setDbOpenListener(new DbManager.DbOpenListener() {
                    @Override
                    public void onDbOpened(DbManager db) {
                        //提高访问数据库的效率
                        db.getDatabase().enableWriteAheadLogging();
                    }
                });
    public DbManager.DaoConfig getDaoConfig() {
    }

        return daoConfig;
    }
}

data（封装类）

//表名字

@Table(name ="yws")
public class DataBean {
        @Column(name = "id",isId = true)
        private String news_id;
        @Column(name = "news_title")
        private String news_title;
        private String news_summary;
        @Column(name = "pic_url")
        private String pic_url;
        public String getNews_id() {
            return news_id;
        }
        public void setNews_id(String news_id) {
            this.news_id = news_id;
        }

        public String getNews_title() {
            return news_title;
        }
        public void setNews_title(String news_title) {
            this.news_title = news_title;
        }

        public String getNews_summary() {
            return news_summary;
        }
        public void setNews_summary(String news_summary) {
            this.news_summary = news_summary;
        }

        public String getPic_url() {
            return pic_url;
        }
        public void setPic_url(String pic_url) {
            this.pic_url = pic_url;
        }

}

mainactivity类

//获取到数据库
App app = (App) getApplication();
DbManager db = x.getDb(app.getDaoConfig());
//判断数据库里面的内容
try {
    List<DataBean> list =  db.findAll(DataBean.class);
    if (list!=null&&list.size()>0){
        mlist.addAll(list);
        myadapter.notifyDataSetChanged();
        Toast.makeText(MainActivity.this,"数据库",Toast.LENGTH_LONG).show();
    }else {
        Toast.makeText(MainActivity.this,"网络",Toast.LENGTH_LONG).show();
        loadData();
    }
} catch (DbException e) {
    e.printStackTrace();
}
加入数据库
try {
    db.save(mlist);
} catch (DbException e) {
    e.printStackTrace();
}