要解决Android Kivy JsonStore在升级后不会保留数据的问题,你可以按照以下步骤进行操作:
from kivy.utils import platform
def get_storage_path():
if platform == 'android':
from android.storage import app_storage_path
return app_storage_path()
else:
return './' # 默认情况下,使用当前目录
storage_path = get_storage_path()
import os
import shutil
def backup_data_file():
old_data_file = os.path.join(storage_path, 'data.json')
if os.path.exists(old_data_file):
backup_file = os.path.join(storage_path, 'data_backup.json')
shutil.copy2(old_data_file, backup_file)
backup_data_file()
def restore_data_file():
backup_file = os.path.join(storage_path, 'data_backup.json')
new_data_file = os.path.join(storage_path, 'data.json')
if os.path.exists(backup_file):
shutil.move(backup_file, new_data_file)
restore_data_file()
通过执行上述步骤,你可以确保在升级应用程序时,旧版的data.json文件会被备份并在升级完成后恢复数据。这样,你就可以保留数据并避免数据丢失的问题。