Question

我正在尝试解析res > xml > my_file.xml上的XML资源文件。它似乎停留在第-1行，我不太明白为什么会这样。

以下是代码：

class SPXMLParser(val context: Context){

    fun parse(): MutableList<Node> {
        Log.d("PONY", "We are inside SPXMLParser.parse()")
        val parser = context.resources.getXml(R.xml.my_file)
        Log.d("PONY", "Parser created text: ${parser.text} Parser line: ${parser.lineNumber}")
        return readFeed(parser)
    }

    private fun readFeed(parser: XmlPullParser): MutableList<Node> {
        Log.d("PONY", "Inside readFeed")
        val entries = mutableListOf<Node>()
        Log.d("PONY", "Before while text: ${parser.text} Parser line: ${parser.lineNumber}")
        while (parser.eventType != XmlPullParser.END_DOCUMENT) {
            Log.d("PONY", "While condition met text: ${parser.text} Parser line: ${parser.lineNumber}")
            val name = parser.name
            // Starts by looking for the entry tag
            if (name == "node") {
                entries.add(readEntry(parser))
            } else {
                skip(parser)
            }
            parser.next()
        }
        Log.d("PONY", "Before returning from readFeed")
        return entries
    }
// ...
    private fun skip(parser: XmlPullParser) {
        Log.d("PONY", "Inside skip function")
        if (parser.eventType != XmlPullParser.START_TAG) {
            Log.d("PONY", "About to throw up")
            throw IllegalStateException()
        }
        var depth = 1
        while (depth != 0) {
            Log.d("PONY", "Inception loop")
            when (parser.next()) {
                XmlPullParser.END_TAG -> depth--
                XmlPullParser.START_TAG -> depth++
            }
        }
        Log.d("PONY", "Exit skip function")
    }
}

以下是我们在logcat中可以阅读的内容：

06-01 15:51:01.972 12030-12030/com.example.learningtoparse D/PONY: We are inside onCreate
06-01 15:51:01.981 12030-12030/com.example.learningtoparse D/PONY: Parser has been created
    We are inside SPXMLParser.parse()
06-01 15:51:01.982 12030-12030/com.example.learningtoparse D/PONY: Parser created text: null Parser line: -1
    Inside readFeed
    Before while text: null Parser line: -1
    While condition met text: null Parser line: -1
    Else condition
    Inside skip function
    About to throw up

我错过了什么？为什么行-1？

编辑：发布函数skip()并更新日志跟踪。我知道应用程序因为未处理的异常IllegalStateException被抛出而停止，但关于解析器为什么排成一行“-1”的问题仍然存在。

EDIT2：I found this question that might be related to mine。但是，答案似乎有点不确定。我的文件中也有XML Prolog：

<?xml version="1.0" encoding="UTF-8"?>

该答案的建议是读取了XML Prolog但我们仍处于事件START_DOCUMENT，因为尚未读取根标记。

为什么从getXml（）获得的XmlResourceParser卡在第-1行？

0 个答案: