Question
I have an error when parsing image url to image and displaying it in my listview..
i have caught the error but im not able to rectify it .... (caught = know where the error is -_-)
First of all im using SAX. Second , im doing a variety of parsing's so i smashed up everything in one activity. third, i will send the log without the exception caught.
the error is the last piece of code... where there is try and catch.
https://stackoverflow.com/questions/22500126
italiano
english
français
española
中国
日本の
العربية
Deutsch
한국어
Português
Russian public class MainActivity extends Activity {
URL url;
ListView list;
ArrayList<String> titles = new ArrayList<String>();
ArrayList<String> artists = new ArrayList<String>();
ArrayList<String> countries = new ArrayList<String>();
ArrayList<String> companies = new ArrayList<String>();
ArrayList<String> prices = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.listView1);
MyAsync ma = new MyAsync();
ma.execute();
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
if(position == 0){
Intent a = new Intent(MainActivity.this , custom.class);
tartActivity(a);
}
}
});
}
class MyAsync extends AsyncTask<Void, Void, Void> {
ProgressDialog pd;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd = ProgressDialog.show(MainActivity.this, "", "loading pc parts");
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
try {
url = new URL("https://dl.dropboxusercontent.com/u/74662678/graphicscards.xml");
// Create an instance for SAXParserFactory
SAXParserFactory mySAXParserFactory = SAXParserFactory
.newInstance();
// Create an instance for SAXParser
SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
// Create an instance for XMLReader
XMLReader myXMLReader = mySAXParser.getXMLReader();
// Create an instance for customized handler class
XMLHandler myXMLHandler = new XMLHandler();
// apply handler to the XMLReader
myXMLReader.setContentHandler(myXMLHandler);
// open the connection
InputSource is = new InputSource(url.openStream());
// parse the data
myXMLReader.parse(is);
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pd.cancel();
CustomAdapter ca = new CustomAdapter();
list.setAdapter(ca);
}
}
class XMLHandler extends DefaultHandler {
boolean TITLE = false;
boolean BRAND = false;
boolean USE = false;
boolean URL = false;
boolean COST = false;
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
// TODO Auto-generated method stub
super.startElement(uri, localName, qName, attributes);
if (localName.equals("TITLE")) {
this.TITLE = true;
} else if (localName.equals("BRAND")) {
this.BRAND = true;
} else if (localName.equals("USE")) {
this.USE = true;
} else if (localName.equals("URL")) {
this.URL = true;
} else if (localName.equals("COST")) {
this.COST = true;
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
// TODO Auto-generated method stub
super.characters(ch, start, length);
if (this.TITLE) {
titles.add(new String(ch, start, length));
} else if (this.BRAND) {
artists.add(new String(ch, start, length));
} else if (this.USE) {
countries.add(new String(ch, start, length));
} else if (this.URL) {
companies.add(new String(ch, start, length));
} else if (this.COST) {
prices.add(new String(ch, start, length));
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
// TODO Auto-generated method stub
super.endElement(uri, localName, qName);
if (localName.equals("TITLE")) {
this.TITLE = false;
} else if (localName.equals("BRAND")) {
this.BRAND = false;
} else if (localName.equals("USE")) {
this.USE = false;
} else if (localName.equals("URL")) {
this.URL = false;
} else if (localName.equals("COST")) {
this.COST = false;
}
}
}
class CustomAdapter extends BaseAdapter {
@Override
public int getCount() {
// TODO Auto-generated method stub
return titles.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int index, View v, ViewGroup arg2) {
// TODO Auto-generated method stub
v = getLayoutInflater().inflate(R.layout.custom, null);
TextView t1 = (TextView) v.findViewById(R.id.title);
TextView t2 = (TextView) v.findViewById(R.id.artist);
TextView t3 = (TextView) v.findViewById(R.id.textView1);
TextView t4 = (TextView) v.findViewById(R.id.duration);
String song = new String();
song = titles.get(index);
t1.setText(titles.get(index).toString());
t2.setText(artists.get(index).toString());
t3.setText(countries.get(index).toString());
t4.setText(prices.get(index).toString());
//loading list picture
String a = companies.get(index).toString();
ImageView lblThumb = (ImageView) findViewById(R.id.thumbie);
try{
int loader = R.drawable.loader;
ImageLoader imgLoader = new ImageLoader(getApplicationContext());
imgLoader.DisplayImage(a, loader, lblThumb);
}catch(Exception e){
Log.d("error" , "lol");
}
return v;
}
}
}
LOG:-
03-19 08:28:34.635: E/AndroidRuntime(3635): FATAL EXCEPTION: main
03-19 08:28:34.635: E/AndroidRuntime(3635): java.lang.NullPointerException
03-19 08:28:34.635: E/AndroidRuntime(3635): at com.ram.saxparserexample.ImageLoader.DisplayImage(ImageLoader.java:48)
03-19 08:28:34.635: E/AndroidRuntime(3635): at com.ram.saxparserexample.MainActivity$CustomAdapter.getView(MainActivity.java:273)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.AbsListView.obtainView(AbsListView.java:2159)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.ListView.makeAndAddView(ListView.java:1831)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.ListView.fillDown(ListView.java:674)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.ListView.fillFromTop(ListView.java:735)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.ListView.layoutChildren(ListView.java:1652)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.AbsListView.onLayout(AbsListView.java:1994)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.View.layout(View.java:14008)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewGroup.layout(ViewGroup.java:4373)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.View.layout(View.java:14008)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewGroup.layout(ViewGroup.java:4373)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.View.layout(View.java:14008)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewGroup.layout(ViewGroup.java:4373)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1663)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1521)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.View.layout(View.java:14008)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewGroup.layout(ViewGroup.java:4373)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.View.layout(View.java:14008)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewGroup.layout(ViewGroup.java:4373)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1892)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1711)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.Choreographer.doFrame(Choreographer.java:532)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.os.Handler.handleCallback(Handler.java:725)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.os.Handler.dispatchMessage(Handler.java:92)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.os.Looper.loop(Looper.java:137)
03-19 08:28:34.635: E/AndroidRuntime(3635): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-19 08:28:34.635: E/AndroidRuntime(3635): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 08:28:34.635: E/AndroidRuntime(3635): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 08:28:34.635: E/AndroidRuntime(3635): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-19 08:28:34.635: E/AndroidRuntime(3635): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-19 08:28:34.635: E/AndroidRuntime(3635): at dalvik.system.NativeStart.main(Native Method)
Solution 2
In your ImageLoader class change your context from getApplicationContext() to MainActivity.this
And also access your ImageView in context of your View as below in your getView method:
ImageView lblThumb = (ImageView)v.findViewById(R.id.thumbie);
OTHER TIPS
You have to change this from
ImageView lblThumb = (ImageView) findViewById(R.id.thumbie);
to
ImageView lblThumb = (ImageView) v.findViewById(R.id.thumbie);
because whenever you have find ID for your UI control in getView() method at that time you need to pass reference of your View's object to find of IDs.
Try this..
ImageView lblThumb = (ImageView) v.findViewById(R.id.thumbie);
Instead of this..
ImageView lblThumb = (ImageView) findViewById(R.id.thumbie);
