0
我想從一個URL讀取一個RSS提要，並在我的應用程序中將它顯示爲一個ListView。Android：從RSS源加載內容後活動沒有渲染任何東西
最初我遇到了一些問題，如主要活動的網絡問題，由於這個問題我轉換了方法並通過一個新線程調用它。
現在我沒有得到任何異常，但我看不到屏幕上的結果。
這裏是我的MainActivity.java：
package com.learning.vikash.newsreaderapplication;
import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ListActivity {
List Headlines=new ArrayList();
List links=new ArrayList();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
Thread thread=new Thread(new Runnable() {
@Override
public void run() {
try{
URL url=new URL("http://www.thehindu.com/news/cities/bangalore/?service=rss");
XmlPullParserFactory factory=XmlPullParserFactory.newInstance();
factory.setNamespaceAware(false);
XmlPullParser xPP=factory.newPullParser();
xPP.setInput(getInputStream(url), "UTF-8");
boolean insideItem=false;
int eventType=xPP.getEventType();
while(eventType!=XmlPullParser.END_DOCUMENT){
if(eventType==XmlPullParser.START_TAG){
if(xPP.getName().equals("item")){
insideItem=true;
}else if(xPP.getName().equals("title")){
if(insideItem){
Headlines.add(xPP.getText());
Log.d("RSS Feed1",xPP.getText());
}
}else if(xPP.getName().equals("link")){
if(insideItem){
links.add(xPP.getText());
Log.d("RSS Feed2", xPP.getText());
}
}
}else if(eventType==XmlPullParser.END_TAG && xPP.getName().equalsIgnoreCase("item")){
insideItem=false;
}
xPP.next();
}
}catch (MalformedURLException e){
e.printStackTrace();
}catch(XmlPullParserException e){
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
}
});
thread.start();
//Changed to run on UI Thread
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run(){
ArrayAdapter adapter=new ArrayAdapter(MainActivity.this,R.layout.content_main,Headlines);
setListAdapter(adapter);
}
});
}
public InputStream getInputStream(URL url) {
try {
return url.openConnection().getInputStream();
} catch (IOException e) {
return null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/* @Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Uri uri = Uri.parse(links.get(position));
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}*/
}
而且我android_manifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.learning.vikash.newsreaderapplication">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
而且content_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.learning.vikash.newsreaderapplication.MainActivity"
tools:showIn="@layout/activity_main">
<ListView
android:id="@android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!" />
</LinearLayout>
我相當新到Android，但由於沒有錯誤或結果，我無法理解。 請幫忙。
你正在更新線程列表？ – Raghunandan