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POjava.lang.RuntimeException: Unable to start activity ComponentInfo
 

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  1. POjava.lang.RuntimeException: Unable to start activity ComponentInfo
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    <p>I'm trying to code a tweeter feed but i have an error for the compilation.</p> <p>I don't forget to add my activity into the manifest. </p> <p>Here is the activity code :</p> <pre><code>package fr.enstb.tp2; 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.parser.JSONParser; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; 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 { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ArrayList&lt;Tweet&gt; tweets = getTweets("android", 1); ListView listView = (ListView) findViewById(R.id.ListViewId); listView.setAdapter(new UserItemAdapter(this, R.layout.tweets_layout, tweets)); } public class UserItemAdapter extends ArrayAdapter&lt;Tweet&gt; { private ArrayList&lt;Tweet&gt; tweets; public UserItemAdapter(Context context, int textViewResourceId, ArrayList&lt;Tweet&gt; tweets) { super(context, 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.tweets_layout, 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&lt;Tweet&gt; getTweets(String searchTerm, int page) { String searchUrl = "http://search.twitter.com/search.json?q=@" + searchTerm + "&amp;rpp=100&amp;page=" + page; ArrayList&lt;Tweet&gt; tweets = new ArrayList&lt;Tweet&gt;(); HttpClient client = new DefaultHttpClient(); HttpGet get = new HttpGet(searchUrl); ResponseHandler&lt;String&gt; 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; } } } </code></pre> <p>And here is the log traces :</p> <pre><code>: E/AndroidRuntime(884): FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.enstb.tp2/fr.enstb.tp2.TweetsActivity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) at android.app.ActivityThread.startActivityNow(ActivityThread.java:1796) at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135) at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347) at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682) at android.widget.TabHost.setCurrentTab(TabHost.java:346) at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:150) at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:540) at android.view.View.performClick(View.java:3460) at android.view.View$PerformClick.run(View.java:13955) at android.os.Handler.handleCallback(Handler.java:605) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4340) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at fr.enstb.tp2.TweetsActivity.getTweets(TweetsActivity.java:126) at fr.enstb.tp2.TweetsActivity.onCreate(TweetsActivity.java:36) at android.app.Activity.performCreate(Activity.java:4465) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) ... 18 more </code></pre> <p>Thankk for your help !</p>
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