Android：从模型类访问 R.string [重复]

Question

我在 model 文件夹中有这个 POJO 模型类。

package com.example.test.model;

public class ModelCampaign {

    private String mNameCampaign;
    private int mIdCampaign;
    private String mTypeCampaign;
    private String mFormattedTypeCampaign;

    public ModelCampaign() {
    }

    public ModelCampaign(String nameCampaign, int idCampaign, String typeCampaign) {
        this.mNameCampaign = mNameCampaign;
        this.mIdCampaign = mIdCampaign;
        this.mTypeCampaign = mTypeCampaign;
    }

    // some stuff

    private String setFormattedTypeCampaign(){

        switch (this.mTypeCampaign){
            case "london" : this.mFormattedTypeCampaign = getString(R.string.london);
                break;
        }

    }

}

我需要访问 strings.xml 文件。当然，我没有上下文。我如何访问它们？

非常感谢！

Answer 1

如果您想从模型类访问资源，则将Resources 对象传递给构造函数。你的构造函数应该是这样的

public ModelCampaign(Resources res,String nameCampaign, int idCampaign, String typeCampaign){
        this.res = res;
        this.mNameCampaign = mNameCampaign;
        this.mIdCampaign = mIdCampaign;
        this.mTypeCampaign = mTypeCampaign;
    }

你可以通过传递 res id 得到这样的字符串

public String getString(int key){
 return res.getString(key);
}

并像这样初始化对象

ModelCampaign mc = new ModelCampaign(getResources(),......);