GreenDao

1.

在项目中的build.gradle中添加

classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'

2.在工程的build.gradle中添加依赖

compile'org.greenrobot:greendao:3.0.1'
compile'org.greenrobot:greendao-generator:3.0.0'

并且在build.gradle的顶部添加

apply plugin: 'org.greenrobot.greendao'

在android {}的最外大括号中加入

greendao {
    schemaVersion 1
    daoPackage 'com.example.greendao.gen'
    targetGenDir 'src/main/java'
}

MyApp类

public class MyApp extends Application {
    private static MyApp app;
    private DaoSession session;

    @Override
    public void onCreate() {
        super.onCreate();
        app=this;
        setDb();
    }

    private void setDb() {
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "USER", null);
        SQLiteDatabase database = helper.getReadableDatabase();
        DaoMaster master = new DaoMaster(database);
        session = master.newSession();

    }

    public static MyApp getApp(){
        return app;
    }
    public DaoSession getDaose(){
        return  session;
    }
}
在manifest → application 中添加name

<application
    android:name=".app.MyApp"

User类

@Entity
public class User {
    @Id
    public long id;
    @Property(nameInDb = "name")
    public String name;}
写完这些在User类中按住Ctrl+F9会自动生成GreenDao的三个帮助类

MainActivity类

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private TextView tv;
    private Button updata;
    private Button delete;
    private Button add;
    private EditText ed2;
    private EditText ed1;
    private UserDao userDao;
    private String a;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        DaoSession daose = MyApp.getApp().getDaose();
        userDao = daose.getUserDao();

    }

    private void initView() {
        ed1 = (EditText)  findViewById(R.id.id_tv);
        ed2 = (EditText) findViewById(R.id.id_name);
        add = (Button) findViewById(R.id.add);
        add.setOnClickListener(this);
        delete = (Button) findViewById(R.id.delete);
        delete.setOnClickListener(this);
        updata = (Button) findViewById(R.id.updata);
        updata.setOnClickListener(this);
        tv = (TextView) findViewById(R.id.tv);

    }


    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.add:
                a = ed1.getText().toString();
                String name=ed2.getText().toString();
                User user=new User(Long.valueOf(a),name);
                userDao.insert(user);
                Toast.makeText(MainActivity.this,"添加数据成功",Toast.LENGTH_LONG).show();
                break;
            case R.id.updata:
                User user1 = userDao.load(Long.valueOf(a));
                String name1=user1.getName();
                tv.setText(name1);
                break;
            case R.id.delete:
                break;
        }

    }
}