dubbel json每次切换活动时输出

{
  "data": {
    "user": {
      "name": "John",
      "age": 30
    }
  }
}

public class MyViewModel extends ViewModel {
    private MutableLiveData<MyData> data = new MutableLiveData<>();

    public LiveData<MyData> getData() {
        return data;
    }

    public void loadData() {
        // 模拟异步加载数据
        new Thread(() -> {
            try {
                Thread.sleep(1000);
                MyData myData = new MyData();
                myData.setUser(new User("John", 30));
                data.postValue(myData);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewModel = new ViewModelProvider(this).get(MyViewModel.class);

        viewModel.getData().observe(this, myData -> {
            // 更新UI
            Log.d("MyActivity", myData.toString());
        });

        viewModel.loadData();
    }
}