Android

Question

这是我的代码，当我单击项目时，我尝试插入数据以共享首选项。

@Override
public boolean onMenuItemClick(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.popup_Favorite:
                songList = songRespones.getSongs();

                SharedPreferences sharedPreferences = getContext().getSharedPreferences(
                        SharePreferenceKey.SONG_LIST, Context.MODE_PRIVATE);
                SharedPreferences.Editor editor = sharedPreferences.edit();

                String songJson = new Gson().toJson(songList.get(position));

                editor.putString(SharePreferenceKey.SONG_LIST, songJson);
                editor.apply();

                showMessage("អ្នកបានរក្សាទុក");

                break;
            case R.id.popup_cencel:
                showMessage("Cancel");
                break;
        }
        return false;
    }
});

这是我想要从共享首选项中获取数据的代码

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    SharedPreferences sharedPreferences = getContext().getSharedPreferences(
            SharePreferenceKey.SONG_LIST, Context.MODE_PRIVATE);

    String getSongJson = sharedPreferences.getString(SharePreferenceKey.SONG_LIST, "N/A");

    List<SongRespones> songList;
    if (!getSongJson.equals("N/A")) {
        Type type = new TypeToken<List<SongRespones>>(){}.getType();
        songList = new Gson().fromJson(getSongJson, type);
        Log.e("ppppp", songList.size() + "");
    }
}

但是我无法得到它。它显示错误如下：

FATAL EXCEPTION: main Process: com.vichit.khmersong, PID: 20040       

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException:
Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
    at com.google.gson.Gson.fromJson(Gson.java:899)
    at com.google.gson.Gson.fromJson(Gson.java:852)
    at com.google.gson.Gson.fromJson(Gson.java:801)

请帮帮我：

Answer 1

您正在存储一个 json 对象，因为 songList.get(position) 将 return 一个对象，所以

更改此行

 String songJson = new Gson().toJson(songList.get(position));

到这个

 String songJson = new Gson().toJson(songList);

Android - 我尝试从共享首选项获取数据

Android - I try to get data from SharePreference

java

gson

android-sharedpreferences