从asyncTask调用具有设置和获取共享首选项的构造函数类(无法传递上下文)

public class SharedPreferenceHelper {
    private SharedPreferences sharedPreferences;
    private SharedPreferences.Editor editor;

    public SharedPreferenceHelper(Context context) {
        sharedPreferences = context.getSharedPreferences("MyPreferences", Context.MODE_PRIVATE);
        editor = sharedPreferences.edit();
    }

    public void setPreference(String key, String value) {
        editor.putString(key, value);
        editor.apply();
    }

    public String getPreference(String key, String defaultValue) {
        return sharedPreferences.getString(key, defaultValue);
    }
}

public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
    private Context context;
    private SharedPreferenceHelper preferenceHelper;

    public MyAsyncTask(Context context) {
        this.context = context;
    }

    @Override
    protected Void doInBackground(Void... voids) {
        preferenceHelper = new SharedPreferenceHelper(context);

        // 设置共享首选项
        preferenceHelper.setPreference("key", "value");

        // 获取共享首选项
        String value = preferenceHelper.getPreference("key", "default");

        return null;
    }
}