我想添加一个函数来导出数据库文件并将其上载到firebase存储，然后单击，下载数据库文件并将其替换（或导入）到当前数据库？idk我的方式是最好的或不是，但这是一个代码，我正在努力工作，这是一个代码，试图将数据库保存到sd卡（外部存储）。我不需要使用写外部存储，也不需要在本地存储上保存。直接使用firebase存储。另外，我还没有测试这段代码，因为我的手机是安卓11，外部存储无法使用。所以也许代码根本不起作用，idk。

private fun importDB() {
        try {

            val sd = Environment.getExternalStorageDirectory()
            val data = Environment.getDataDirectory()
            if (sd.canWrite()) {
                val currentDBPath = ("//data//" + "PackageName"
                        + "//databases//" + "DatabaseName")
                val backupDBPath = "/BackupFolder/DatabaseName"
                val backupDB = File(data, currentDBPath)
                val currentDB = File(sd, backupDBPath)
                val src = FileInputStream(currentDB).channel
                val dst = FileOutputStream(backupDB).channel
                dst.transferFrom(src, 0, src.size())
                src.close()
                dst.close()
                Toast.makeText(
                    baseContext, backupDB.toString(),
                    Toast.LENGTH_LONG
                ).show()
            }
        } catch (e: Exception) {
            Toast.makeText(baseContext, e.toString(), Toast.LENGTH_LONG)
                .show()
        }
    }

    //exporting database
    private fun exportDB() {
        val storageRef = FirebaseStorage.getInstance().reference
            .child("database/${FirebaseAuth.getInstance().currentUser?.uid}")
        try {
            val sd = Environment.getExternalStorageDirectory()
            val data = Environment.getDataDirectory()
            if (sd.canWrite()) {
                val currentDBPath = ("//data//" + "PackageName"
                        + "//databases//" + "DatabaseName")
                val backupDBPath = "/BackupFolder/DatabaseName"
                val currentDB = File(data, currentDBPath)
                val backupDB = File(sd, backupDBPath)
                val src = FileInputStream(currentDB).channel
                val dst = FileOutputStream(backupDB).channel
                dst.transferFrom(src, 0, src.size())
                src.close()
                dst.close()
                Toast.makeText(
                    baseContext, backupDB.toString(),
                    Toast.LENGTH_LONG
                ).show()
            }
        } catch (e: Exception) {
            Toast.makeText(baseContext, e.toString(), Toast.LENGTH_LONG)
                .show()
        }
    }