從URL獲取XML文件到Android應用程序

Question

我在從網站獲取.xml數據並將其解析為android應用程序時遇到問題，我嘗試了很多建議，但從未成功。 當我打開Assets文件夾中的文件時，它工作正常，但是當我嘗試從url獲取文件時，它什么也沒顯示

這是我的活動課

package com.android.baliweather;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;  
import android.widget.TextView;

public class Prakiraan extends Activity {
/** Called when the activity is first created. */
private ListView listView;
private TextView judul;
private String URL_MAIN = "http://localhost/android/propinsi_17_1.xml";

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.prakiraan_cuaca);
    judul = (TextView) findViewById(R.id.menu1);
    listView = (ListView) findViewById(R.id.listview);
    bindDataToListing();
}

private void bindDataToListing() {
    try {
        URL url = new URL("http://localhost/android/propinsi_17_1.xml");
        URLConnection connection = url.openConnection();
        //URLConnection connection = url.openConnection();  
        //HttpURLConnection httpConnection = (HttpURLConnection)connection;
        //InputStream in = httpConnection.getInputStream();
        SAXParserFactory saxparser = SAXParserFactory.newInstance();
        SAXParser parser = saxparser.newSAXParser();
        XMLReader xmlReader = parser.getXMLReader();
        XMLParser pc = new XMLParser();
        xmlReader.setContentHandler(pc);
        //InputStream is = getAssets().open("propinsi_17_1.xml");
        //InputStream is = new URL(URL_MAIN).openStream();
        xmlReader.parse(new InputSource(connection.getInputStream()));
        BindingData bindingData = new BindingData(this, pc.kota, pc.cuaca, pc.suhuMin, pc.suhuMax, pc.kelembapanMin, pc.kelembapanMax, pc.kecepatanAngin, pc.arahAngin);
        listView.setAdapter(bindingData);
    } 
    catch (Exception e) {
        e.getMessage();
    }
}

}

我認為問題僅在這一堂課上，但是我不知道哪一個。 請幫忙

Answer 1

可能是android.os.NetworkOnMainThreadException您正在嘗試在UI線程中執行耗時的任務，並且系統阻止您執行此操作（您可能會在logcat中看到它）。 您可以實現AsyncTask以便在后台線程中執行。

也可能是您忘記了在清單文件中添加權限- <uses-permission android:name="android.permission.INTERNET" />