删除android webview的数据库，webview本地存储需要杀掉进程才能生效

我需要区分不同用户的webview数据，所以我需要备份webview数据并还原它，但是webview重新加载页面后还原的数据不符合最新的，需要杀掉进程读取最新的数据，应该解决杀掉进程的问题

private const val WEB_VIEW_DATA_DIR_NAME = "webview"
private const val WEB_VIEW_CACHE_DIR_NAME = "WebView"
private const val WEB_VIEW_USER_INFO_NAME = "app_user_id.txt"

@JvmStatic
fun checkWebData(context: Context, userId: String) {
    backupWebView(context, userId)
    backupWebViewCache(context, userId)
}

private fun backupWebViewCache(context: Context, userId: String) {
    val dir = File(context.cacheDir, WEB_VIEW_CACHE_DIR_NAME)
    if (dir.exists()) {
        backupDir(userId, dir) {
        }
    }
}

private fun backupWebView(context: Context, userId: String) {
    val dir = context.getDir(WEB_VIEW_DATA_DIR_NAME, Context.MODE_PRIVATE)
    if (!dir.exists()) {
        dir.mkdirs()
    }
    backupDir(userId, dir) {
        //临时方案，需解决web view数据库文件修改后，需杀进程才能生效问题
        WebStorage.getInstance().deleteAllData()
    }
}

private fun backupDir(userId: String, dir: File, function: (Boolean) -> Unit) {
    val userFile = File(dir, WEB_VIEW_USER_INFO_NAME)
    if (userFile.exists()) {
        val readFileToString = readFileToString(userFile)
        if (readFileToString != userId) {
            function.invoke(dir.renameTo(File("${dir.absolutePath}_$readFileToString")))
            val file = File("${dir.absolutePath}_$userId")
            if (file.exists()) {
                val renameTo = file.renameTo(dir)
                LogUtils.d(TAG, "restore ${dir.name} result : $renameTo")
            }
        }
    } else {
        writeStringToFile(userId, userFile)
    }
}

private fun readFileToString(file: File) : String {
    var fileInputStream : FileInputStream? = null;
    try {
        fileInputStream = FileInputStream(file)
        return String(fileInputStream.readBytes())
    } catch (e: Exception) {
    } finally {
        try {
            fileInputStream?.close()
        } catch (e: Exception) {
        }
    }
    return ""
}

private fun writeStringToFile(string: String, file: File) {
    var fileOutputStream : FileOutputStream? = null
    try {
        fileOutputStream = FileOutputStream(file)
        file.writeBytes(string.toByteArray())
    } catch (e: Exception) {

    } finally {
        try {
            fileOutputStream?.close()
        } catch (e: Exception) {
        }
    }
}