// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {    repositories {        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.1'        classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'        // NOTE: Do not place your application dependencies here; they belong        // in the individual module build.gradle files    }}allprojects {    repositories {        jcenter()    }}task clean(type: Delete) {    delete rootProject.buildDir}

apply plugin: 'com.android.application'apply plugin: 'org.greenrobot.greendao'android {    compileSdkVersion 26    buildToolsVersion "27.0.1"    defaultConfig {        applicationId "com.bwie.greendaolian"        minSdkVersion 16        targetSdkVersion 26        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"        greendao {            schemaVersion 1            daoPackage 'com.bwie.greendaolian.gen'            targetGenDir 'src/main/java'        }    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {        exclude group: 'com.android.support', module: 'support-annotations'    })    compile 'com.android.support:appcompat-v7:26.+'    compile 'com.android.support.constraint:constraint-layout:1.0.2'    testCompile 'junit:junit:4.12'    compile'org.greenrobot:greendao:3.0.1'    compile'org.greenrobot:greendao-generator:3.0.0'    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'    compile 'com.jakewharton:butterknife:8.8.1'}

package com.bwie.greendaolian;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.Toast;import com.bwie.greendaolian.gen.UserDao;import org.greenrobot.greendao.generator.Entity;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.OnClick;public class MainActivity extends AppCompatActivity {    @BindView(R.id.bt)    Button bt;    @BindView(R.id.bt2)    Button bt2;    @BindView(R.id.bt3)    Button bt3;    @BindView(R.id.bt4)    Button bt4;    private User mUser;    private Long id;    private UserDao mUserDao;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        mUserDao = MyApplication.getInstances().getDaoSession().getUserDao();    }    @OnClick({R.id.bt, R.id.bt2, R.id.bt3, R.id.bt4})    public void onViewClicked(View view) {        switch (view.getId()) {            case R.id.bt:                mUser = new User(null,"张三");                mUserDao.insert(mUser);//添加一个                break;            case R.id.bt2://                List
     
       userList = (List
      
       ) mUserDao.queryBuilder().where(UserDao.Properties.Id.le(20)).build().list();//                for (User user : userList) {//                    mUserDao.delete(user);//                }                mUserDao.deleteAll();                break;            case R.id.bt3:                mUser = new User((long)2,"anye0803");                mUserDao.update(mUser);                break;            case R.id.bt4:                List
       
         users = mUserDao.loadAll();                String userName = "";                for (int i = 0; i < users.size(); i++) {                    userName += users.get(i).getName()+",";                }                Toast.makeText(this,userName, Toast.LENGTH_SHORT).show();                break;        }    }}
       
      
     

package com.bwie.greendaolian;import android.app.Application;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import com.bwie.greendaolian.gen.DaoMaster;import com.bwie.greendaolian.gen.DaoSession;public class MyApplication extends Application {    public static Context context;    private DaoMaster.DevOpenHelper mHelper; private SQLiteDatabase db; private DaoMaster mDaoMaster; private DaoSession mDaoSession; public static MyApplication instances; @Override    public void onCreate() {     super.onCreate();     instances = this;     setDatabase(); } public static MyApplication getInstances(){     return instances; }/** * 设置greenDao */private void setDatabase() {    // 通过 DaoMaster 的内部类 DevOpenHelper，你可以得到一个便利的 SQLiteOpenHelper 对象。    // 可能你已经注意到了，你并不需要去编写「CREATE TABLE」这样的 SQL 语句，因为 greenDAO 已经帮你做了。    // 注意：默认的 DaoMaster.DevOpenHelper 会在数据库升级时，删除所有的表，意味着这将导致数据的丢失。    // 所以，在正式的项目中，你还应该做一层封装，来实现数据库的安全升级。    mHelper = new DaoMaster.DevOpenHelper(this, "notes-db", null);    db = mHelper.getWritableDatabase();    // 注意：该数据库连接属于 DaoMaster，所以多个 Session 指的是相同的数据库连接。     mDaoMaster = new DaoMaster(db);     mDaoSession = mDaoMaster.newSession();}public DaoSession getDaoSession() {      return mDaoSession;}public SQLiteDatabase getDb() {      return db;  }}

package com.bwie.greendaolian;import org.greenrobot.greendao.annotation.Entity;import org.greenrobot.greendao.annotation.Id;import org.greenrobot.greendao.annotation.Transient;import org.greenrobot.greendao.annotation.Generated;/** * Created by lenovo on 2017/11/30. */@Entitypublic class User {    @Id(autoincrement =true)    private Long id;    private String name;    @Transient    private int tempUsageCount; // not persisted    public String getName() {        return this.name;    }    public void setName(String name) {        this.name = name;    }    public Long getId() {        return this.id;    }    public void setId(Long id) {        this.id = id;    }    @Generated(hash = 873297011)    public User(Long id, String name) {        this.id = id;        this.name = name;    }    @Generated(hash = 586692638)    public User() {    }    }