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