My tabs fragments doesnt seems to show anything. I know there must be something missing in my codes. Could someone please help me? Below are my attempt.
Modified after the suggestion by UgglyNoodle
Problems : My fragment Tab is not showing anything.
MainActivity.java
public class MainActivity extends SherlockFragmentActivity implements TabListener {
private Fragment mFragment;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(true);
//mFragment = new AppleFragment();
Tab tab = actionBar.newTab()
.setText("Apple")
.setTabListener(this)
.setIcon(R.drawable.apple);
actionBar.addTab(tab);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if (mFragment == null) {
mFragment = new AppleFragment();
ft.add(android.R.id.content, mFragment);
} else {
ft.attach(mFragment);
}
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.detach(mFragment);
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
AppleFragment.java
public class AppleFragment extends SherlockListFragment{
static final String URL = "http://api.androidhive.info/pizza/?format=xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "id";
static final String KEY_NAME = "name";
static final String KEY_COST = "cost";
static final String KEY_DESC = "description";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return super.onCreateView(inflater, container, savedInstanceState);
}
public void onActivityCreated(Bundle savedInstanceState) {
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
map.put(KEY_COST, "Rs." + parser.getValue(e, KEY_COST));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
// adding HashList to ArrayList
menuItems.add(map);
}
ListAdapter adapter = new SimpleAdapter(getActivity(), menuItems,
R.layout.list_item,
new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
R.id.name, R.id.desciption, R.id.cost });
setListAdapter(adapter);
}
}
XMLParser.java
public class XMLParser {
// constructor
public XMLParser() {
}
/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
/**
* Getting XML DOM element
* @param XML string
* */
public Document getDomElement(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}
return doc;
}
/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {
Node child;
if( elem != null){
if (elem.hasChildNodes()){
for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
if( child.getNodeType() == Node.TEXT_NODE ){
return child.getNodeValue();
}
}
}
}
return "";
}
/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
Logcat :
10-05 16:24:30.031: E/AndroidRuntime(19244): FATAL EXCEPTION: main
10-05 16:24:30.031: E/AndroidRuntime(19244): java.lang.RuntimeException: Unable to start activity ComponentInfo{in.wptrafficanalyzer.actionbarsherlocknavtab/in.wptrafficanalyzer.actionbarsherlocknavtab.MainActivity}: android.os.NetworkOnMainThreadException
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread.access$600(ActivityThread.java:127)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.os.Handler.dispatchMessage(Handler.java:99)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.os.Looper.loop(Looper.java:137)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread.main(ActivityThread.java:4512)
10-05 16:24:30.031: E/AndroidRuntime(19244): at java.lang.reflect.Method.invokeNative(Native Method)
10-05 16:24:30.031: E/AndroidRuntime(19244): at java.lang.reflect.Method.invoke(Method.java:511)
10-05 16:24:30.031: E/AndroidRuntime(19244): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
10-05 16:24:30.031: E/AndroidRuntime(19244): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
10-05 16:24:30.031: E/AndroidRuntime(19244): at dalvik.system.NativeStart.main(Native Method)
10-05 16:24:30.031: E/AndroidRuntime(19244): Caused by: android.os.NetworkOnMainThreadException
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
10-05 16:24:30.031: E/AndroidRuntime(19244): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
10-05 16:24:30.031: E/AndroidRuntime(19244): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
10-05 16:24:30.031: E/AndroidRuntime(19244): at java.net.InetAddress.getAllByName(InetAddress.java:220)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-05 16:24:30.031: E/AndroidRuntime(19244): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-05 16:24:30.031: E/AndroidRuntime(19244): at in.wptrafficanalyzer.actionbarsherlocknavtab.XMLParser.getXmlFromUrl(XMLParser.java:45)
10-05 16:24:30.031: E/AndroidRuntime(19244): at in.wptrafficanalyzer.actionbarsherlocknavtab.AppleFragment.onCreate(AppleFragment.java:50)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:834)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:505)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1136)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.Activity.performStart(Activity.java:4475)
10-05 16:24:30.031: E/AndroidRuntime(19244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1943)
10-05 16:24:30.031: E/AndroidRuntime(19244): ... 11 more
You don’t need your
AppleFragmentclass. Instead, you can have yourMainActivityto implementTabListener. Here is some quick code which gives you the basic idea, but I have not tested it and it will need some fixing.When you have multiple tabs, you will need to keep track of the multiple fragments, and attach and detach the right ones according to the tab selected.
Finally, your
ArrayListFragmentshould extendListFragment, and you will still be able to usesetListAdapter()and so on.This page has a pretty good example, although it is a little more complicated than what I have suggested.