GreenDao，clearIdentityScope报错Error:Execution failed for task ':app:compileDebugJavaWithJavac'. > Com

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：[email protected]
 */

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 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 queryUserList() {
        DaoMaster daoMaster = new DaoMaster(getReadableDatabase());
        DaoSession daoSession = daoMaster.newSession();
        BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao();
        QueryBuilder qb = userDao.queryBuilder().orderDesc(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber);
        List list = qb.list();
        return list;
    }


    /**
     * 查询用户列表
     */
    public List queryUserList(String path) {
        DaoMaster daoMaster = new DaoMaster(getReadableDatabase());
        DaoSession daoSession = daoMaster.newSession();
        BlackInfoCallMIssedBeanDao userDao = daoSession.getBlackInfoCallMIssedBeanDao();
        QueryBuilder qb = userDao.queryBuilder();
        qb.where(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber.gt(path)).orderAsc(BlackInfoCallMIssedBeanDao.Properties.PhoneNumber);
        List 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。