Android - 我嘗試從SharePreference獲取數據

Question

這是我嘗試插入數據以共享首選項時我點擊Item的代碼。

@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; 
    } 
}); 

這裏是我的代碼，我想從分享偏好

@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() + ""); 
    } 
} 

獲取數據，但我不能得到它。它顯示以下錯誤：

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) 

請幫幫我：

Answer 1

您存儲一個JSON對象，因爲songList.get(position)將返回一個對象，以便

更改這條線

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

到這

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