首先是greendao的配置
GreenDao配置
在工程的build.grdle中，如下：
buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.0.1' 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 { google() jcenter() mavenCentral () } } }
在build.gradle(Module:app)中添加下面代码：
apply plugin: 'com.android.application' android { compileSdkVersion 26 defaultConfig { applicationId "com.example.administrator.myapplication" minSdkVersion 15 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" javaCompileOptions { annotationProcessorOptions { includeCompileClasspath = true } }//butterKnife } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } buildscript { repositories { mavenCentral() } dependencies { classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1' } } apply plugin: 'org.greenrobot.greendao' greendao { schemaVersion 1//数据库版本号 daoPackage 'com.aa'//设置DaoMaster、DaoSession、Dao包名 targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录 //targetGenDirTest：设置生成单元测试目录 //generateTests：设置自动生成单元测试用例 } dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation 'com.android.support:appcompat-v7:26.1.0' implementation 'com.android.support.constraint:constraint-layout:1.1.3' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' implementation 'com.jakewharton:butterknife:8.8.1' annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1' //butterknife //动态申请权限 compile 'io.reactivex.rxjava2:rxandroid:2.0.1' compile 'io.reactivex.rxjava2:rxjava:2.0.5' compile 'com.tbruyelle.rxpermissions2:rxpermissions:0.9.3@aar' implementation files('libs/jxl.jar') //greendao数据库 compile 'org.greenrobot:greendao:3.2.0' }
出现错误：
Error:(41, 22) 错误: 找不到符号
符号: 方法 clearIdentityScope()
位置: 类型为DaoConfig的变量 dataDaoConfig
Error:(185, 5) 错误: 方法不会覆盖或实现超类型的方法
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details
原因是你的greendao对应的包版本不一致，DaoMaster，DaoSession都是自动生成的，有报错，一般是jar包和依赖版本不一致。按照我上面的是可以的。
GreenDao的基本配置就已经完成了，下面我们编写一个实体类。
实体类User
@Entity public class User { @Id(autoincrement = true) private Long id; private String name; private int age; }
相关注解说明：
- 实体@Entity注解
- schema：告知GreenDao当前实体属于哪个schema
active：标记一个实体处于活跃状态，活动实体有更新、删除和刷新方法
nameInDb：在数据库中使用的别名，默认使用的是实体的类名
indexes：定义索引，可以跨越多个列
createInDb：标记创建数据库表
工具类 package com.bestgo.callshow.db.greendao; import android.content.Context; import android.database.sqlite.SQLiteDatabase; import com.bestgo.callshow.bean.BlackInfoCallMIssedBean; import com.bestgo.callshow.db.greendao.gen.BlackInfoCallMIssedBeanDao; import com.bestgo.callshow.db.greendao.gen.DaoMaster; import com.bestgo.callshow.db.greendao.gen.DaoSession; import org.greenrobot.greendao.query.QueryBuilder; import java.util.List; /** * 作者：jiuqunZhang on 2018/4/28 21:12 * 邮箱：woshizhangjiqun@gmail.com */ public class DBManager { private final static String dbName = "test_db"; private static DBManager mInstance; private DaoMaster.DevOpenHelper openHelper; private Context context; public DBManager(Context context) { this.context = context; openHelper = new DaoMaster.DevOpenHelper(context, dbName, null); } /** * 获取单例引用 * * @param context * @return */ public static DBManager getInstance(Context context) { if (mInstance == null) { synchronized (DBManager.class) { if (mInstance == null) { mInstance = new DBManager(context); } } } return mInstance; } private SQLiteDatabase getReadableDatabase() { if (openHelper == null) { openHelper = new DaoMaster.DevOpenHelper(context, dbName, null); } SQLiteDatabase db = openHelper.getReadableDatabase(); return db; } private SQLiteDatabase getWritableDatabase() { if (openHelper == null) { openHelper = new DaoMaster.DevOpenHelper(context, dbName, null); } SQLiteDatabase db = openHelper.getWritableDatabase(); return db; } /** * 插入一条记录 * * @param BlackInfoCallMIssedBean */ public void insertUser(BlackInfoCallMIssedBean BlackInfoCallMIssedBean) { DaoMaster daoMaster = new DaoMaster(getWritableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); userDao.insert(BlackInfoCallMIssedBean); } public void insertUserList(List<BlackInfoCallMIssedBean> BlackInfoCallMIssedBeans) { if (BlackInfoCallMIssedBeans == null || BlackInfoCallMIssedBeans.isEmpty()) { return; } DaoMaster daoMaster = new DaoMaster(getWritableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); userDao.insertInTx(BlackInfoCallMIssedBeans); } public void deleteUser(BlackInfoCallMIssedBean BlackInfoCallMIssedBean) { DaoMaster daoMaster = new DaoMaster(getWritableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); userDao.queryBuilder() .where(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber.eq(BlackInfoCallMIssedBean.getPhoneNumber())) .buildDelete() .executeDeleteWithoutDetachingEntities(); } public void updateUser(BlackInfoCallMIssedBean BlackInfoCallMIssedBean) { DaoMaster daoMaster = new DaoMaster(getWritableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); userDao.update(BlackInfoCallMIssedBean); } public List<BlackInfoCallMIssedBean> queryUserList() { DaoMaster daoMaster = new DaoMaster(getReadableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); QueryBuilder<BlackInfoCallMIssedBean> qb = userDao.queryBuilder().orderDesc(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber); List<BlackInfoCallMIssedBean> list = qb.list(); return list; } /** * 查询用户列表 */ public List<BlackInfoCallMIssedBean> queryUserList(String path) { DaoMaster daoMaster = new DaoMaster(getReadableDatabase()); DaoSession daoSession = daoMaster.newSession(); BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao(); QueryBuilder<BlackInfoCallMIssedBean> qb = userDao.queryBuilder(); qb.where(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber.gt(path)).orderAsc(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber); List<BlackInfoCallMIssedBean> list = qb.list(); return list; }
这是有关增删改查的管理办法。
在实体类中这样用：
DBManager.getInstance(getApplicationContext()).insertUser(blackInfoCallMIssedBean);
其他的语句类似。
实体类的生成比较简单，就是如下：
@Entity public class BlackInfoBean { /** * 自增长的id */ @Id private Long id; /** * 联系人id,相当于姓名 */ private long contactsId; /** * 联系人姓名 */ private String name; /** * 电话号码 */ private String phoneNumber;
类似这个，@Entity，@Id就是GreeenDao的标志。写完属性之后就直接点击Make Project。就是自动的生成Get，Set方法还有toString。
每个人应用的场景不一样，欢迎留言， 一起 讨论。
