Android GreenDao3.2配置及使用详解

1.首先在Androidstudio 项目的build.grad 文件中引入一下文件

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.1'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.0'
        // 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
}

2.在module的build.gradle文件中添加greenDAO的插件，并引入相关类库

apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao'
apply plugin: 'android-apt'
android {
    compileSdkVersion 24
    buildToolsVersion "24.0.2"
    defaultConfig {
        applicationId "com.mvp.observer"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    greendao{
        schemaVersion 1
        targetGenDir 'src/main/java'
    }
}

dependencies {
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    testCompile 'junit:junit:4.12'
    compile 'org.greenrobot:greendao:3.2.0'
    compile 'com.android.support:recyclerview-v7:24.2.1'

}

3 .在项目包下创建实体类

@Entity
public class User {

    @Id
    private Long id;
    @Property(nameInDb = "USERNAME")
    private String username;
    @Property(nameInDb = "NICKNAME")
    private String nickname;
    @Generated(hash = 523935516)
    public User(Long id, String username, String nickname) {
        this.id = id;
        this.username = username;
        this.nickname = nickname;
    }
    @Generated(hash = 586692638)
    public User() {
    }
    public Long getId() {
        return this.id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getUsername() {
        return this.username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getNickname() {
        return this.nickname;
    }
    public void setNickname(String nickname) {
        this.nickname = nickname;
    }
}

@Entity表示这个实体类会在数据库中生成对应的表，

@Id表示该字段是id，注意该字段的数据类型为包装类型Long

@Property则表示该属性将作为表的一个字段，其中nameInDb看名字就知道这个属性在数据库中对应的数据名称

运行将项目进行编译，编译成功之后系统会帮助我们生成相应的构造方法和get/set方法，并且还会在我们的包下生成DaoMaster和DaoSession。那么这里常用的注解除了这几个之外，还有一个较常用的就是@Transient，该注解表示这个属性将不会作为数据表中的一个字段。就是这么简单。另外还有一些比如@NotNull表示该字段不可以为空，@Unique表示该字段唯一。这里的注解还是挺多的，小伙伴们有兴趣可以自行研究

4.创建dbmanager类初始化数据库

DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(getApplicationContext(), "lenve.db", null);  
DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());  
DaoSession daoSession = daoMaster.newSession(); 

5.获取Dao

 userDao = daoSession.getUserDao();  

6.在dbmanager中实现增删该查 ，添加数据

User user = new User(null, "zhangsan" + random.nextInt(9999),"张三");  
userDao.insert(user); 
\\其他大家查看Api实现即可

项目下载地址:https://github.com/androidDongdong/MvpAndObserver