helo，我想从这个文件中读取值：http://www.nbp.pl/kursy/xml/lastC.xml并用它们填充网格。我的应用程序下载此文件并将其保存在SDCard earch运行时间。我的问题是我的代码读取空值。这是：

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

grid= (GridView)findViewById(R.id.grid);

try{

url = new URL("http://www.nbp.pl/kursy/xml/LastC.xml");

HttpURLConnection connection = (HttpURLConnection)url.openConnection();

connection.setRequestMethod("GET");

connection.setDoOutput(true);

connection.connect();

File dir = new File (android.os.Environment.getExternalStorageDirectory().getAbsolutePath() + "/Kursy Walut");

if(dir.exists()==false)

dir.mkdirs();

File file = new File(dir, "kursywalut.xml");

FileOutputStream fileoutput = new FileOutputStream(file);

InputStream inputstream = connection.getInputStream();

int tempSize=0;

byte[] buffer = new byte[1024];

while((tempSize = inputstream.read(buffer))>0)

{

fileoutput.write(buffer, 0, tempSize);

}

fileoutput.close();

在我的sdCard上保存文件并制作一个包含信息的Toast

Toast.makeText(MainActivity.this, "pobrano do Kursy Walut/kursywalut.xml!!", Toast.LENGTH_SHORT).show();

//here i have a array of string witch i will parse into my grid

String[] items=new String[13];

InputStream in = new FileInputStream(file.getPath());

DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();

Document doc = builder.parse(in);

NodeList words = doc.getElementsByTagName("pozycja");

for(int i=0; i

{

items[i]= ((Element)words.item(i)).getAttribute("kod_waluty");

}

//i setText on some textView to check that i read xmlfile correctly.

text.setText("value: "+items[5]);

in.close();

grid.setAdapter(new ArrayAdapter(this,android.R.layout.simple_list_item_1, items));

}

catch(Throwable t){Toast.makeText(this, t.toString(), Toast.LENGTH_LONG).show();}

}

在此代码之后，我的TextView文本只是“value：”，没有来自xml的值

我的网格是空的。我认为我在阅读xml文件时犯了错误。

如果有人能看到这个并帮助我解决它，我将非常高兴。