android - 反序列化 json 对象失败

Question

我想将列表保存到 Android SharedPreferences，但如日志所示，出现错误。我的代码在这里:

将列表保存到 SharedPreferences。我想将一个 bean 保存为对象。

public static void putBookBean(Context ctx, List<BookBean> bookList) {
    if (sp == null) {
        sp = ctx.getSharedPreferences("config", MODE_PRIVATE);
    }
    SharedPreferences.Editor editor = sp.edit();
    Gson gson = new Gson();
    String json = gson.toJson(bookList);
    editor.putString(ConstantValue.BOOK_BEAN, json);
    editor.commit();
}

加载列表:

public static ArrayList<BookBean> getBookBean(Context ctx) {
    if (sp == null) {
        sp = ctx.getSharedPreferences("config", MODE_PRIVATE);
    }
    Gson gson = new Gson();
    String json = sp.getString(ConstantValue.BOOK_BEAN, null);
    Type type = new TypeToken<ArrayList<BookBean>>() {
    }.getType();
    ArrayList<BookBean> arrayList = gson.fromJson(json, type);
    return arrayList;
}

这是我的 bean :

public class BookBean {
public String bookName;
public int bookBgSrc;

public BookBean(String bookName,int bookBgSrc){
    this.bookName = bookName;
    this.bookBgSrc =bookBgSrc;
}

public String getBookName(){
    return bookName;
}

public int getBookBgSrc(){
    return bookBgSrc;
}

并使用:

Int mDatas[] = {R.drawable.shape_book_gold, R.drawable.shape_book_add};
String mInfos[] = {"我的账本", "添加账本"};
List<BookBean> mBookList;
mBookList = new ArrayList<BookBean>();
    for (int i = 0; i < mDatas.length; i++) {
        mBookList.add(new BookBean(mInfos[i], mDatas[i]));
    }
    if (SpUtils.getBookBean(getApplicationContext()) == null) {
        SpUtils.putBookBean(getApplicationContext(), mBookList);
    }

mRvAdapter = new BookSelectRvAdapter(getApplicationContext(),
            SpUtils.getBookBean(getApplicationContext()));

mBookList.add(mBookList.size() - 2,
                        new BookBean("新增账本", R.drawable.shape_book_gold+""));
                SpUtils.putBookBean(getApplicationContext(), mBookList);

日志在这里:

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.chase.cn.money_of_my/activity.BookSelectActivity}: com.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@52899014 failed to deserialized json object [{"bookName":"我的账本","bookBgSrc":2130837618},{"bookName":"添加账本","bookBgSrc":2130837617}] given the type java.util.ArrayList<beans.BookBean>
                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
                                                                        at android.app.ActivityThread.access$800(ActivityThread.java:135)
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                        at android.os.Looper.loop(Looper.java:136)
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5001)
                                                                        at java.lang.reflect.Method.invokeNative(Native Method)
                                                                        at java.lang.reflect.Method.invoke(Method.java:515)
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
                                                                        at dalvik.system.NativeStart.main(Native Method)
                                                                     Caused by: com.google.gson.JsonParseException: The JsonDeserializer com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter@52899014 failed to deserialized json object [{"bookName":"我的账本","bookBgSrc":2130837618},{"bookName":"添加账本","bookBgSrc":2130837617}] given the type java.util.ArrayList<beans.BookBean>
                                                                        at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:63)
                                                                        at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:88)
                                                                        at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java:76)
                                                                        at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:106)
                                                                        at com.google.gson.JsonDeserializationContextDefault.fromJsonArray(JsonDeserializationContextDefault.java:64)
                                                                        at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:49)
                                                                        at com.google.gson.Gson.fromJson(Gson.java:568)
                                                                        at com.google.gson.Gson.fromJson(Gson.java:515)
                                                                        at com.google.gson.Gson.fromJson(Gson.java:484)
                                                                        at com.google.gson.Gson.fromJson(Gson.java:434)
                                                                        at utils.SpUtils.getBookBean(SpUtils.java:139)
                                                                        at activity.BookSelectActivity.initData(BookSelectActivity.java:61)
                                                                        at activity.BookSelectActivity.onCreate(BookSelectActivity.java:43)
                                                                        at android.app.Activity.performCreate(Activity.java:5231)
                                                                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
                                                                        at android.app.ActivityThread.access$800(ActivityThread.java:135) 
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                        at android.os.Looper.loop(Looper.java:136) 
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5001) 
                                                                        at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                        at java.lang.reflect.Method.invoke(Method.java:515)

感谢您检查我的代码。

Answer 1

你的BookBean需要这样写。

public class BookBean {
    public String bookName;
    public long bookBgSrc;

    public BookBean(){

    }


    public BookBean(String bookName,long bookBgSrc){
        this.bookName = bookName;
        this.bookBgSrc =bookBgSrc;
    }

    public String getBookName(){
        return bookName;
    }

    public long getBookBgSrc(){
        return bookBgSrc;
    }

    public void setBookBgSrc(long bookBgSrc) {
        this.bookBgSrc = bookBgSrc;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }
}