GreenDao存集合类型数据、List＜String＞ 、List＜Integer＞

此文章是基于已经成功导入GreenDao了，但是GreenDao存集合类型的数据需要多几步的操作，至于怎么导入，这个自己上网查了，这篇就不赘述了（或者以后可能会补上，等我忘了怎么用把。。。）

 

第一步，导入Gson第三方。

 

第二步，新建类InterConverter , StringConverter 类，代码如下\

public class InterConverter implements PropertyConverter<List<Integer>, String> {
 
    private final Gson mGson;
 
    public InterConverter() {
        mGson = new Gson();
    }
 
    @Override
    public List<Integer> convertToEntityProperty(String databaseValue) {
        Type type = new TypeToken<ArrayList<Integer>>() {
        }.getType();
        ArrayList<Integer> list = mGson.fromJson(databaseValue , type);
        return list;
    }
 
    @Override
    public String convertToDatabaseValue(List<Integer> entityProperty) {
        String dbString = mGson.toJson(entityProperty);
        return dbString;
    }
 
 
}
 

public class StringConverter implements PropertyConverter<List<String> , String>{
 
 
    @Override
    public List<String> convertToEntityProperty(String databaseValue) {
        if (databaseValue == null) {
            return null;
        }
        else {
            List<String> list = Arrays.asList(databaseValue.split(","));
            return list;
        }
    }
 
    @Override
    public String convertToDatabaseValue(List<String> entityProperty) {
        if(entityProperty==null){
            return null;
        }
        else{
            StringBuilder sb= new StringBuilder();
            for(String link:entityProperty){
                sb.append(link);
                sb.append(",");
            }
            return sb.toString();
        }
    }
}

第三步，在最开始的编译生成的DaoMaster DaoSession 的那个类，下面添加新的元素进去 然后再重新Sync Project

with Gradle Files     

@Convert 是添加集合需要的

核心代码如下：

@Convert(columnType = String.class, converter = StringConverter.class)
    private List<String> nickname;
 
    @Convert(columnType = String.class, converter = InterConverter.class)
    private List<Integer> hahaha;

我编译之后的OBDL类最终代码如下:

@Entity
public class OBDL {
 
    @Id
    private Long id;
 
    @Property
    @NotNull
    private String name;
 
    @Convert(columnType = String.class, converter = StringConverter.class)
    private List<String> nickname;
 
    @Convert(columnType = String.class, converter = InterConverter.class)
    private List<Integer> hahaha;
 
 
    @Generated(hash = 1316419519)
    public OBDL(Long id, @NotNull String name, List<String> nickname,
            List<Integer> hahaha) {
        this.id = id;
        this.name = name;
        this.nickname = nickname;
        this.hahaha = hahaha;
    }
 
    @Generated(hash = 1700707547)
    public OBDL() {
    }
 
    public Long getId() {
        return this.id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getName() {
        return this.name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public List<String> getNickname() {
        return this.nickname;
    }
 
    public void setNickname(List<String> nickname) {
        this.nickname = nickname;
    }
 
    public List<Integer> getHahaha() {
        return this.hahaha;
    }
 
    public void setHahaha(List<Integer> hahaha) {
        this.hahaha = hahaha;
    }
 
 
 
}

 

之后单例的类没有其他变化

 

具体调用如下：

public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        DBTool.getOutInstance().deleteAll();
 
        List<Integer> data = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            data.add(i);
        }
 
        OBDL obdl = new OBDL();
        obdl.setName("qwe");
        obdl.setHahaha(data);
        DBTool.getOutInstance().insertBean(obdl);
 
        for (Integer qwe : DBTool.getOutInstance().getQueryKey("qwe").getHahaha()) {
            LogUtil.chunyLog().d(qwe);
        }
 
//        List<String> data = new ArrayList<>();
//        for (int i = 0; i < 10; i++) {
//            data.add(i + "asd");
//        }
//
//        OBDL obdl = new OBDL();
//        obdl.setName("qwe");
//        obdl.setNickname(data);
//        DBTool.getOutInstance().insertBean(obdl);
//
//
//        for (String qwe : DBTool.getOutInstance().getQueryKey("qwe").getNickname()) {
//            LogUtil.chunyLog().d(qwe);
//        }
 
 
    }
}

存int 集合和 String 集合都写了（String集合就是注释掉的那一块）

OK  收工