Lancement d'un thread pour récupérer tweets
Bonjour,
j'ai récupéré un code sur ce site (http://codehenge.net/blog/2011/05/an...r-feed-reader/) permettant de récupérer et d'afficher des tweets dans une application mobile.
J'ai un problème avec ce code, un cast qui ne fonctionne pas. En fait, je pense que je m'y prends mal pour lancer le thread.
Je voudrais lancer un thread pour récupérer les tweets (en fait lancer la méthode getTweets.)
Pouvez-vous m'aider?
Merci,
Voici mon code :
Code:
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package fr.enstb.tp2;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
import org.json.simple.parser.JSONParser;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class TweetsActivity extends Activity {
private Runnable mgetTweets = new Runnable() {
@Override
public void run(){
// Auto-generated method stub
ArrayList<Tweet> tweets = getTweets("android", 1);
ListView listView = (ListView) findViewById(R.id.ListViewId);
listView.setAdapter(new UserItemAdapter(this, R.layout.listitem, tweets));
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//ArrayList<Tweet> tweets = getTweets("android", 1);
Thread myThread = new Thread(mgetTweets);
myThread.start();
}
public class UserItemAdapter extends ArrayAdapter<Tweet> {
private ArrayList<Tweet> tweets;
public UserItemAdapter(Runnable runnable, int textViewResourceId, ArrayList<Tweet> tweets) {
super((Context) runnable, textViewResourceId, tweets);
this.tweets = tweets;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.listitem, null);
}
Tweet tweet = tweets.get(position);
if (tweet != null) {
TextView username = (TextView) v.findViewById(R.id.username);
TextView message = (TextView) v.findViewById(R.id.message);
ImageView image = (ImageView) v.findViewById(R.id.avatar);
if (username != null) {
username.setText(tweet.username);
}
if(message != null) {
message.setText(tweet.message);
}
if(image != null) {
image.setImageBitmap(getBitmap(tweet.image_url));
}
}
return v;
}
}
public Bitmap getBitmap(String bitmapUrl) {
try {
URL url = new URL(bitmapUrl);
return BitmapFactory.decodeStream(url.openConnection() .getInputStream());
}
catch(Exception ex) {return null;}
}
public ArrayList<Tweet> getTweets(String searchTerm, int page) {
String searchUrl = "http://search.twitter.com/search.json?q=@"
+ searchTerm + "&rpp=100&page=" + page;
ArrayList<Tweet> tweets = new ArrayList<Tweet>();
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(searchUrl);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = null;
try{
responseBody = client.execute(get, responseHandler);
}catch(Exception ex) {
ex.printStackTrace();
}
JSONObject jsonObject = null;
JSONParser parser=new JSONParser();
try {
Object obj = parser.parse(responseBody);
jsonObject=(JSONObject)obj;
}catch(Exception ex){
Log.v("TEST","Exception: " + ex.getMessage());
}
JSONArray arr = null;
try {
Object j = jsonObject.get("results");
arr = (JSONArray)j;
}catch(Exception ex){
Log.v("TEST","Exception: " + ex.getMessage());
}
for(Object t : arr) {
Tweet tweet = new Tweet(
((JSONObject)t).get("from_user").toString(),
((JSONObject)t).get("text").toString(),
((JSONObject)t).get("profile_image_url").toString()
);
tweets.add(tweet);
}
return tweets;
}
public class Tweet {
public String username;
public String message;
public String image_url;
public Tweet(String username, String message, String url) {
this.username = username;
this.message = message;
this.image_url = url;
}
}
} |
Et voici la trace :
Code:
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FATAL EXCEPTION: Thread-91
java.lang.ClassCastException: fr.enstb.tp2.TweetsActivity$1 cannot be cast to android.content.Context
at fr.enstb.tp2.TweetsActivity$UserItemAdapter.<init>(TweetsActivity.java:63)
at fr.enstb.tp2.TweetsActivity$1.run(TweetsActivity.java:43)
at java.lang.Thread.run(Thread.java:856) |
