Question

我正在使用这个库https://github.com/stepstone-tech/android-material-stepper 用于在单个活动中容纳多个片段。在其中一个片段中，我试图在onSaveInstanceState()方法中保存片段recyclelerview中的项目对象，它工作得很好但是当应用程序失去焦点时（例如按下主页按钮），应用程序崩溃（它的工作原理）当我按下后退按钮退出应用程序时）。这是片段

 public class StylesFragment extends Fragment implements Step {
        private static final String STATE_ITEMS = "items";
        RecyclerView recyclerView;
        private TAASService mService;
        public ArrayList<CustomStyles> styles;
        public StylesFragment() {
            // Required empty public constructor
        }

        @Override
        public void onCreate(Bundle savedInstanceState){
            super.onCreate(savedInstanceState);

        }

        @SuppressWarnings("unchecked")
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment

            final View v=inflater.inflate(R.layout.fragment_styles, container, false);
            recyclerView=(RecyclerView) v.findViewById(R.id.recycler);
            //recyclerView.setAdapter(adapter);
            mService = ApiUtils.getTAASService();
            if (savedInstanceState==null) {
                loadCustomStyles();
            }else{
                    styles = (ArrayList<CustomStyles>) savedInstanceState.getSerializable(STATE_ITEMS);
                    StylesListAdapter adapter = new StylesListAdapter(styles);
                    //do more things

            }
            return v;
        }

        @Override
        public void onSaveInstanceState(Bundle outState) {
            super.onSaveInstanceState(outState);
            outState.putSerializable(STATE_ITEMS,styles);
        }


        public void loadCustomStyles() {

          //load from network
        }

所以我注意到删除outState.putSerializable();。当应用程序失去焦点时，它不会使应用程序崩溃，任何人都知道这里发生了什么以及我如何纠正它？谢谢

PS：我用于编码android的笔记本电脑质量很低，所以我无法使用logcat.Have来组装，安装在我的手机上，看它是如何工作的。

更新

public class CustomStyles implements Serializable{

    @SerializedName("pk")
    @Expose
    private Integer pk;
    @SerializedName("name")
    @Expose
    private String name;
    @SerializedName("gender")
    @Expose
    private String gender;
    @SerializedName("photo1")
    @Expose
    private String photo1;
    @SerializedName("custom_price")
    @Expose
    private Integer customPrice;
    @SerializedName("designer")
    @Expose
    private Designer designer;

    public Integer getPk() {
        return pk;
    }

    public void setPk(Integer pk) {
        this.pk = pk;
    }

    public String getName() {
        return name;
    }
    @Override
    public String toString() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getPhoto1() {
        return photo1;
    }

    public void setPhoto1(String photo1) {
        this.photo1 = photo1;
    }

    public Integer getCustomPrice() {
        return customPrice;
    }

    public void setCustomPrice(Integer customPrice) {
        this.customPrice = customPrice;
    }

    public Designer getDesigner()  {
        return designer;
    }

    public void setDesigner(Designer designer) {
        this.designer = designer;
    }

}

Answer 1

您的 CustomStyles 类不可序列化

在您的CustomStyles类中实现serializable（以及在CustomStyles类中使用的所有自定义类）

public class CustomStyles implements Serializable {

    .
    .
    .
    .
}

在片段代码

1 个答案: