detalList = bean.getDetalList();//为什么这一段有问题？我的这里的detaList不就是下面的detalList吗？详解必采纳

Question

public class ExercisesDetailActivity extends AppCompatActivity {
    private TextView tv_main_title;
    private TextView tv_back;
    private RelativeLayout rl_title_bar;
    private ListView lv_list;
    private String title;
    private ExercisesBean bean;
    private List<ExercisesDetailBean> detalList;
    private ExercisesDetailAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_exercises_detail);
        //获取从习题界面传递过来的习题数据
        bean = (ExercisesBean) getIntent().getSerializableExtra("detalList");
        if (bean != null) {
            title = bean.getChapterName();      //获取习题所在的章节名称
            detalList = bean.getDetalList();//为什么这一段有问题？我的这里的detaList不就是下面的detalList吗？
        }

public class ExercisesBean implements Serializable {
    private static final long serialVersionUID=1L;
    private int id;//章节id
    private String chapterName;//章节名称
    private int totalNum;//习题总数
    private int background;//章节序号背景
    private List<ExercisesDetailBean> detalList;//习题详情列表



    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getChapterName() {
        return chapterName;
    }

    public void setChapterName(String chapterName) {
        this.chapterName = chapterName;
    }

    public int getTotalNum() {
        return totalNum;
    }

    public void setTotalNum(int totalNum) {
        this.totalNum = totalNum;
    }

    public int getBackground() {
        return background;
    }

    public void setBackground(int backgroud) {
        this.background = backgroud;
    }

    public List<ExercisesDetailBean> getDetalList() {
        return detalList;
    }

    public void setDetalList(List<ExercisesDetailBean> detalList) {
        this.detalList = detalList;
    }
}

这里为什么获取数据的时候获取不到啊？我

Answer 1

该回答通过自己思路及引用到GPTᴼᴾᴱᴺᴬᴵ搜索,得到内容具体如下：

在你的代码中，获取 ExercisesBean 对象是通过 getSerializableExtra 方法实现的，其参数应该是 "bean" 而不是 "detalList"。因此，修改以下代码：

bean = (ExercisesBean) getIntent().getSerializableExtra("detalList");

为：

bean = (ExercisesBean) getIntent().getSerializableExtra("bean");

这样就可以正确地获取到 ExercisesBean 对象，并从中获取到 detalList 列表了。

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