GreenDao-----Demo

主项目的build.gradle

dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'

    }
allprojects {
    repositories {
        google()
        jcenter()
    }
}

App的build.gradle

apply plugin: 'org.greenrobot.greendao'

greendao {
        schemaVersion 1  //版本
        daoPackage 'wanghuiqi.bawie.com.green_dao.user' // 一般为app包名+生成文件的文件夹名
        targetGenDir 'src/main/java' //生成文件路径
    }

    implementation 'org.greenrobot:greendao:3.2.2'
    implementation 'org.greenrobot:greendao-generator:3.2.2'

MyApplication

public class MyApplication extends Application {
    private DaoMaster.DevOpenHelper helper;
    public static MyApplication instances;
    private DaoMaster.DevOpenHelper helper1;
    private SQLiteDatabase db;
    private DaoMaster daoMaster;
    private DaoSession daoSession;

    @Override
    public void onCreate() {
        super.onCreate();
        instances=this;
        setDatabase();
    }

    public static MyApplication getInstances(){
        return instances;
    }
    private void setDatabase() {
        helper1 = new DaoMaster.DevOpenHelper(this, "note-db", null);
        db = helper1.getWritableDatabase();
        daoMaster = new DaoMaster(db);
        daoSession = daoMaster.newSession();
    }
    public DaoSession getDaoSession(){
        return daoSession;
    }
    public SQLiteDatabase getDb(){
        return db;
    }
}

User 类

@Entity
public class User {
    @Id(autoincrement = true)
    private Long id;
    @Property(nameInDb = "NAME")
    private String name;
    @Generated(hash = 873297011)
    public User(Long id, String name) {
        this.id = id;
        this.name = name;
    }
    @Generated(hash = 586692638)
    public User() {
    }
    public Long getId() {
        return this.id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private UserDao userDao;
    private User user;
    private Button insert;
    private Button del;
    private Button update;
    private Button sel;
    private TextView text;
    private EditText ed_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        //获取UserDao
        userDao = MyApplication.getInstances().getDaoSession().getUserDao();


    }

    private void initView() {
        insert = (Button) findViewById(R.id.insert);
        del = (Button) findViewById(R.id.del);
        update = (Button) findViewById(R.id.update);
        sel = (Button) findViewById(R.id.sel);
        text = (TextView) findViewById(R.id.text);
        ed_text = findViewById(R.id.ed_text);

        insert.setOnClickListener(this);
        del.setOnClickListener(this);
        update.setOnClickListener(this);
        sel.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.insert:
                //添加
                user = new User(null, "王慧琦");
                userDao.insert(user);
                break;
            case R.id.del:
                String trim_del = ed_text.getText().toString().trim();
                Integer integer_del = Integer.valueOf(trim_del);
                //删除
                userDao.deleteByKey((long) integer_del);
                break;
            case R.id.update:
                //改
                String trim_up = ed_text.getText().toString().trim();
                Integer integer_up = Integer.valueOf(trim_up);
                user = new User((long) integer_up, "W王慧琦0.0");
                userDao.update(user);
                break;
            case R.id.sel:
                //查
                List<User> users = userDao.loadAll();
                String userName = "";
                for (int i = 0; i < users.size(); i++) {
                    userName += "," + users.get(i).getName() + users.get(i).getId();
                }
                text.setText("查询全部数据==>" + userName);
                break;
        }
    }
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/insert"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="添加" />

        <Button
            android:id="@+id/del"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="删除" />

        <Button
            android:id="@+id/update"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="修改" />

        <Button
            android:id="@+id/sel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="查询" />

    </LinearLayout>

    <EditText
        android:id="@+id/ed_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="jskhdja" />
</LinearLayout>