预期为BEGIN_ARRAY,但为BEGIN_OBJECT | ArrayList问题 [英] Expected BEGIN_ARRAY but was BEGIN_OBJECT | ArrayList issue
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问题描述
我正在使用Gson库保存和检索Players对象的ArrayList.
I'm using the Gson library to save and retrieve an ArrayList of Players Objects.
@Override
protected void onStop() {
super.onStop();
SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
Gson gson = new Gson();
String guardJSON = gson.toJson(playersNoGuard);
editor.putString(GUARD, guardJSON);
editor.putString("lastActivity", getClass().getName());
editor.apply();
}
我的onCreate重要部分
ArrayList<Player> playersNoGuard;
RecyclerView myList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_players_guard);
SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE);
String guardJSON = prefs.getString(GUARD, null);
Type arrayListPlayers = new TypeToken<ArrayList<Player>>(){}.getType();
Gson gson = new Gson();
if(guardJSON != null) {
playersNoGuard = gson.fromJson(guardJSON, arrayListPlayers);
}
// Get the players and remove the Clairvoyant
Intent intent = this.getIntent();
playersNoGuard = intent.getParcelableArrayListExtra("PLAYERS");
[...] // Code skipped
}
但是当运行此活动时,我得到以下错误日志:
But when this Activity is run, I get the following error log:
由以下原因引起:java.lang.IllegalStateException:预期为BEGIN_ARRAY,但在第1行第2列$$处为BEGIN_OBJECT
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
此代码有什么问题?
推荐答案
您可能在其他地方写了相同的首选项条目.确保您的密钥(GUARD
)在整个应用程序中是唯一的.
You probably write to the same preferences entry somewhere else. Ensure that your key (GUARD
) is unique throughout the application.
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