Call a method that throws exception

Question

I am writing an app to pull and display content from an atom feed. The method for that works, but I get the error "Unhandled exception: java.lang.Exception" when I try to call the method "showFeed()" in onNavigationItemSelected.

package com.myapp; import java.net.URL; import java.util.Iterator; import com.sun.syndication.feed.synd.SyndEntry; import com.sun.syndication.feed.synd.SyndFeed; import com.sun.syndication.io.SyndFeedInput; import com.sun.syndication.io.XmlReader; // ... public boolean onNavigationItemSelected(@NonNull MenuItem item) { switch (item.getItemId()) { case R.id.navigation_home: showFeed(); } } // ... public void showFeed() throws Exception { URL url = new URL("http://feeds.feedburner.com/javatipsfeed"); XmlReader xmlReader = null; try { xmlReader = new XmlReader(url); SyndFeed feeder = new SyndFeedInput().build(xmlReader); System.out.println("Title Value " + feeder.getAuthor()); for (Iterator iterator = feeder.getEntries().iterator(); iterator.hasNext();) { SyndEntry syndEntry = (SyndEntry) iterator.next(); System.out.println(syndEntry.getTitle()); } } finally { if (xmlReader != null) xmlReader.close(); } }

I want to call this method in onNavigationItemSelected.

What is the exception? I guess it would be I/O exception try it write in seperate thread or use async task — Sanjeev
– Sanjeev, Commented Mar 25, 2019 at 10:23
Use a try-catch or add throws Exception to the method. Checked exceptions must be handled. — TiiJ7
– TiiJ7, Commented Mar 25, 2019 at 10:27

Santosh · Accepted Answer · 2019-03-25 12:54:41Z

Your showFeed method is throwing Exception,

public void showFeed() throws Exception

This has to be caught using try-catch block or thrown further from the caller method which is onNavigationItemSelected

So either catch it like this,

 case R.id.navigation_home: try{ showFeed(); } catch (Exception e) { e.printStackTrace(); }

Or throw it again like below,

public boolean onNavigationItemSelected(@NonNull MenuItem item) throws Exception

This took away the error. Thanks. I marked this as answer because it showed an example

Sanjeev · Accepted Answer · 2019-03-25 10:28:28Z

You are running network related threads on UI Thread which may cause ANR (Activity not responding) Follow the following tutorial.

Android AsyncTask example and explanation

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