Question

我使用以下代码将曲目添加到收藏夹

 private void addToFavourites(LocalTrack localTrack) {
        SharedPreferences        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor            = sharedPreferences.edit();
        Gson                     gson              = new Gson();
        int                      imgKey            = 0;
        String                   json              = gson.toJson(localTrack);
        editor.putString("" + imgKey, json);
        editor.apply();
        imgKey++;

    }

我使用以下代码从收藏中删除曲目。

private void removeFromFavourites(LocalTrack localTrack){
        ArrayList<LocalTrack>    localTracks       = loadPreferences();
        for (int i = 0; i < localTracks.size(); i++){
            if (localTracks.get(i).getPath().equals(localTrack.getPath())){
                localTracks.remove(localTrack);
            }
        }
        SharedPreferences        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor            = sharedPreferences.edit();
        Gson                     gson              = new Gson();
        int                      imgKey            = 0;
        String                   json              = gson.toJson(localTracks);
        editor.putString("" + imgKey, json);
        editor.apply();
        imgKey++;
    }

向收藏夹添加曲目非常有效。从收藏夹删除轨道错误地对齐json，因此我得到如下错误，

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

如何在没有jsonsyntax异常的情况下从json中删除轨道？

更新

public static ArrayList<LocalTrack> loadPreferences() {
        SharedPreferences     sharedPreferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.act);
        Gson                  gson              = new Gson();
        Map<String, ?>        allPrefs          = sharedPreferences.getAll();
        String                gsonString        = sharedPreferences.getString("userImages", "");
        ArrayList<LocalTrack> images            = new ArrayList<LocalTrack>();
        if (!allPrefs.isEmpty()) {
            for (Map.Entry<String, ?> entry : allPrefs.entrySet()) {
                String     json = entry.getValue().toString();
                LocalTrack temp = gson.fromJson(json, LocalTrack.class);
                images.add(temp);
            }
        }
        return images;
    }

我添加了加载首选项方法

Answer 1

你可以直接反序列化通用集合：

Sub TestReplace()

    ReplaceSheetNameInFormula Range("A1:C6"), "A", "Print"
    ReplaceSheetNameInFormula Range("A1:C6"), "A-b", "Print"

End Sub


Sub ReplaceSheetNameInFormula(Target As Range, OldSheet As String, NewSheet As String)
    Const TempName = "TempDefinedName"

    Dim What As String, Replacement As String
    Replacement = "'" & NewSheet & "'!"

    With Worksheets(NewSheet)
        .Names.Add TempName, Worksheets(OldSheet).Range("A1"), False
        What = Mid(.Names(TempName), 2, Len(.Names(TempName)) - 5)
    End With

    Target.Replace What, Replacement

End Sub

使用gsonto时添加或删除对象时出现JsonSyntaxException

1 个答案: