Hello,
I have a map view in my android application and the map has overlays
showing the events at a location, when i tap on the balloon overlay,
it should take to the event details which is another activity in the
application.
there are few events which is shown in a list and each list item shows
the description of the event when clicked/selected. I am trying to
call the event by sending the indices of the map overlays. i.e. if i
click the map overlay with index i should open the description of the
corresponding event with the same index in the event list. the indices
are passed through intents and are received in the required activity.
But when i use the index for the method required to display the event
details i get null pointer exception. I'll post the code which is used
to display the event list and event details. and will post logcat too.
Please have a review of the code and let me know where i may have gone
wrong and what needs to be done.
Thank you.
P.S. my code and log cat below
_____________________________________________________________________________
// my overlay
public void onBalloonTap(int index, Item item) {
Intent i = new Intent(c,FestivalEvents.class);
i.putExtra("index", index);
event.setUpDesc(index);
c.startActivity(i);
}
// events activity
public class FestivalEvents extends Activity{
private ListView SearchListView;
private ArrayList<ParsedData> items = new ArrayList<ParsedData>();
private RelativeLayout fv;
private TextView tv1;
private TextView tv2;
private TextView tv3;
private TextView date1;
private ImageButton twitter;
private ImageButton facebook;
private ImageButton back;
private ImageButton home;
private boolean mCheckView;
private SearchListAdapter aa;
private String nameOFFile;
private TextView title;
private ImageView arrowImgRight;
private ImageView arrowImgLeft;
private String channelStr;
int bkp_position = 0;
private ImageView imLink;
private ImageView imageLink;
ImageView banner_img;
ImageView banner_imge;
private static Context mContext;
private final int BANNER_TIME = 3000;
private final int BANNER_MSG = 1;
private int banner_index = 0;
private int[] mImages_banner =
{
R.drawable.banner,
R.drawable.banner1,
R.drawable.banner2,
R.drawable.banner3
};
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case BANNER_MSG: {
if(banner_index > 3)
banner_index = 0;
banner_imge.setImageResource(mImages_banner[banner_index]);
banner_index++;
mHandler.sendEmptyMessageDelayed(BANNER_MSG,BANNER_TIME);
break;
}
default:
super.handleMessage(msg);
}
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.festivalevents1);
Bundle extras = getIntent().getExtras();
// int index = extras.getInt("index");
// setUpDesc(index);
SearchListView =
(ListView)this.findViewById(R.id.searchListView);
banner_imge = (ImageView) findViewById(R.id.imageView3);
banner_imge.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Log.i("BedFordApp", "Banner clicked");
if(mContext == null)
{
Log.i("BedFordApp", " context null");
// return ;
}
Intent i = new Intent(FestivalEvents.this,
Sponsors.class);
i.putExtra("Name", "FestivalSponsors");
i.putExtra("title", "title");
Log.i("FestivalEvents", "Banner clicked");
switch(banner_index)
{
case 1:
i.putExtra("banner", 1);
break;
case 2:
i.putExtra("banner", 2);
break;
case 3:
i.putExtra("banner", 3);
break;
case 4:
i.putExtra("banner", 4);
break;
}
FestivalEvents.this.startActivity(i);
}
});
mHandler.sendEmptyMessageDelayed(BANNER_MSG,BANNER_TIME);
//SearchListView.setse
fv = (RelativeLayout)this.findViewById(R.id.fullview);
tv1 = (TextView)this.findViewById(R.id.titel);
tv2 = (TextView)this.findViewById(R.id.desc);
tv2.setMovementMethod(new ScrollingMovementMethod());
tv3 = (TextView)this.findViewById(R.id.link);
date1 = (TextView)this.findViewById(R.id.date1);
imLink = (ImageView)this.findViewById(R.id.imgLink);
arrowImgRight = (ImageView)
this.findViewById(R.id.arwimgright);
arrowImgRight.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
System.out.println(bkp_position);
if(bkp_position <= nodeLength)
{
bkp_position = bkp_position+1;
setUpDesc(bkp_position);
visibility_arrow_postion();
//visibility_left_arrow_postion();
}else {
bkp_position =0;
}
}
});
arrowImgLeft = (ImageView) this.findViewById(R.id.arwimgleft);
arrowImgLeft.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(bkp_position >= 0)
{
bkp_position = bkp_position-1;
setUpDesc(bkp_position);
//visibility_left_arrow_postion();
visibility_arrow_postion();
}else{
bkp_position =nodeLength;
}
}
});
title = (TextView)this.findViewById(R.id.title);
back = (ImageButton)findViewById(R.id.back);
home = (ImageButton)findViewById(R.id.home);
twitter = (ImageButton)findViewById(R.id.twitt);
facebook = (ImageButton)findViewById(R.id.facebook);
int Index = extras.getInt("index");
Log.i("index from map"," index is " + Index);
if(extras != null){
setUpDesc(Index); // i'm not sure if i'm handling the indices
in a proper way but i'm passing the indices to this method.
}
if(items.size()>0)
items.clear();
back.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
if(mCheckView){
fv.setVisibility(View.GONE);
SearchListView.setVisibility(View.VISIBLE);
mCheckView = false;
}
else{
finish();
}
// finish();
}
});
home.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
finish();
}
});
twitter.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
Intent web = new Intent(FestivalEvents.this,
Twitter.class);
startActivity(web);
}
});
facebook.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Facebook facebook = new Facebook(BedFordApp.APP_ID);
String[] lPermissions = new String[] {
"user_likes"
};
facebook.authorize(FestivalEvents.this, lPermissions,
new BedFordFBDialogListener(
FestivalEvents.this, facebook));
}
});
tv3.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
String link =tv3.getText().toString();
Intent web = new
Intent(FestivalEvents.this,WebView1.class);
web.putExtra("link", link);
// web.putExtra("channelstr", channelStr);
startActivity(web);
}
});
aa = new SearchListAdapter(this);
SearchListView.setAdapter(aa);
refreshEarthquakes(nameOFFile);
}
private int nodeLength;
private void refreshEarthquakes(String fileName) {
// Get the XML
try {
// File file = new File("/sdcard/BedfordEvents.xml");
// obj_is = new FileInputStream(file);
InputStream inputStream =
getAssets().open("BedfordEvents.xml");
DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
// Parse the earthquake feed.
Document dom = db.parse(new
InputSource(inputStream));
Element docEle = dom.getDocumentElement();
// Clear the old earthquakes
items.clear();
// Get a list of each earthquake entry.
NodeList nl = docEle.getElementsByTagName("SearchResults");
nodeLength = nl.getLength()-1;
if (nl != null && nl.getLength() > 0) {
for (int i = 0 ; i < nl.getLength(); i++) {
Element entry = (Element)nl.item(i);
Element title =
(Element)entry.getElementsByTagName("ArticleId").item(0);
Element g =
(Element)entry.getElementsByTagName("ArticleTitle").item(0);
Element when =
(Element)entry.getElementsByTagName("ArticleDesc").item(0);
Element link =
(Element)entry.getElementsByTagName("WebsiteLink").item(0);
Element image =
(Element)entry.getElementsByTagName("ImageLink").item(0);
Element articleDate =
(Element)entry.getElementsByTagName("ArticleDate").item(0);
String details = title.getFirstChild().getNodeValue();
//String hostname = "http://earthquake.usgs.gov";;
String linkString =
link.getFirstChild().getNodeValue();
String imageLink =
image.getFirstChild().getNodeValue();
String date =
articleDate.getFirstChild().getNodeValue();
String titel = g.getFirstChild().getNodeValue();
String dt = when.getFirstChild().getNodeValue();
ParsedData pd = new ParsedData(details,titel, dt,
linkString, imageLink,date);
// Process a newly found data
addNewDetail(pd);
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
}catch (FileNotFoundException e) {
System.out.println("file not found");
Toast.makeText(this, "No such File with Name "+nameOFFile+"
Found in sdcard", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
finally {
}
}
private void addNewDetail(ParsedData _data) {
// Add the new data to our list
items.add(_data);
// Notify the Base adapter of a change.
aa.notifyDataSetChanged();
}
class SearchListAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
private int currentPosition =0;
public SearchListAdapter(Context c) {
mContext = c;
mInflater = LayoutInflater.from(mContext);
}
public int getCount() {
return items.size();
}
public Object getItem(int position) {
return items.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView =
mInflater.inflate(R.layout.festivalevents2, null);
holder = new ViewHolder();
holder.bar =
(ProgressBar)convertView.findViewById(R.id.progress);
holder.imageLink = (ImageView)
convertView.findViewById(R.id.imageLink);
holder.title = (TextView)
convertView.findViewById(R.id.title);
holder.desc = (TextView)
convertView.findViewById(R.id.desc);
holder.link = (TextView)
convertView.findViewById(R.id.link);
holder.date = (TextView)
convertView.findViewById(R.id.date);
holder.link.setVisibility(View.GONE);
holder.desc.setVisibility(View.GONE);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
convertView.setOnClickListener(new
OnClickListener() {
public void onClick(View arg0) {
// Toast.makeText(mContext, "you
clicked position "+position,
Toast.LENGTH_LONG).show();
bkp_position = position;
//visibility_left_arrow_postion();
visibility_arrow_postion();
setUpDesc(position);
}
});
holder.date.setText(items.get(position).getDate());
holder.title.setText(items.get(position).getArticleTitle());
// title.setGravity(Gravity.RIGHT);
holder.desc.setText(items.get(position).getArticleDesc());
final ProgressBar bar = holder.bar;
final ImageView holderImage = holder.imageLink;
new Thread(){
public void run() {
try {
BitmapFactory.Options o = new
BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new
URL(items.get(
position).getImageLink()).openStream(),null,o);
//The new size we want to scale to
final int REQUIRED_SIZE=40;
//Find the correct scale value. It should be
the power of
2.
int width_tmp=o.outWidth,
height_tmp=o.outHeight;
int scale=1;
while(true){
if(width_tmp/2<REQUIRED_SIZE || height_tmp/
2<REQUIRED_SIZE)
break;
width_tmp/=2;
height_tmp/=2;
scale*=2;
}
//Decode with inSampleSize
BitmapFactory.Options o2 = new
BitmapFactory.Options();
o2.inSampleSize=scale;
final Bitmap lBitmap =
BitmapFactory.decodeStream(new
URL(items.get(
position).getImageLink()).openStream(),
null, o2);
handler.post(new Runnable() {
public void run() {
holderImage.setImageBitmap(lBitmap);
holderImage.setVisibility(View.VISIBLE);
bar.setVisibility(View.GONE);
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
SpannableString content = new
SpannableString(items.get(position).getLink());
content.setSpan(new UnderlineSpan(), 0, content.length(),
0);
holder.link.setText(content);
holder.link.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
startWebView(position+1);
}
});
return convertView;
}
protected void startWebView(int position) {
String link = items.get(position).getLink();
Intent web = new
Intent(mContext,WebView1.class);
web.setAction("android.intent.action.own");
web.putExtra("link", link);
web.putExtra("channelstr", channelStr);
mContext.startActivity(web);
}
class ViewHolder {
TextView date;
ProgressBar bar;
ImageView imageLink;
TextView title;
TextView desc;
TextView link;
}
}
private void visibility_arrow_postion()
{
if (bkp_position == 0){
arrowImgLeft.setVisibility(View.INVISIBLE);
}else{
arrowImgLeft.setVisibility(View.VISIBLE);
}
if (bkp_position == nodeLength){
arrowImgRight.setVisibility(View.INVISIBLE);
}else{
arrowImgRight.setVisibility(View.VISIBLE);
}
}
// THIS METHOD IS THE ONE WHICH HELPS SHOWING EVENT DETAILS
private void setUpDesc(int position) {
SearchListView.setVisibility(View.GONE);
mCheckView = true;
final ParsedData parsedData = items.get(position);
fv.setVisibility(View.VISIBLE);
tv1.setText(parsedData.getArticleTitle());
tv2.setText(parsedData.getArticleDesc());
tv3.setText(parsedData.getLink());
date1.setText(parsedData.getDate());
Bundle lBundle = new Bundle();
lBundle.putString("url", parsedData.getImageLink());
Message msg = new Message();
msg.setData(lBundle);
handler.dispatchMessage(msg);
}
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
Bundle lBundle = msg.getData();
String url = lBundle.getString("url");
try {
Bitmap lBitmap = BitmapFactory.decodeStream(new
URL(url).openStream());
imLink.setImageBitmap(lBitmap);
// imageLink.setImageBitmap(lBitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
};
}
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