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POError in launching an activity from list view
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<h2>I am trying to launch a activity from a list view but having some errors</h2> <ul> <li>I am able to populate the JSON data but when i click on the row in the list(which is intended to launch an activity ) I get errors</li> <li>I have mentioned the logcat output below</li> </ul> Any-Ideas ? <hr> CopperChimney.java <pre><code>public class CopperChimney extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.copperchimney_desc_screen); Button btn1=(Button) findViewById(R.id.TopBackButton); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent emp1=new Intent(CopperChimney.this,MainActivity.class); startActivity(emp1); } }); } } </code></pre> MainActivity.java <pre><code>public class MainActivity extends Activity { // url to make request private static String url = "http://54.218.73.244:7000/"; List<Item> yourData = new ArrayList<Item>(); ProgressDialog progressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Instantiating ProgressDialog with onCreate method progressDialog=new ProgressDialog(MainActivity.this); new ParsingAsync().execute(); } private class ParsingAsync extends AsyncTask<Void, Void, Void> { @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); progressDialog=ProgressDialog.show(MainActivity.this, "", "Please Wait", true, false); } @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub // Creating JSON Parser instance JSONParser jParser = new JSONParser(); // getting JSON string from URL JSONArray json = jParser.getJSONFromUrl(url); try { for (int i = 0; i < json.length(); i++) { JSONObject c = json.getJSONObject(i); // Storing each json item in variable String NAME=c.getString("restaurantNAME"); yourData.add(new Item(NAME)); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { // TODO Auto-generated method stub super.onPostExecute(result); progressDialog.dismiss(); ListView yourListView = (ListView) findViewById(R.id.listViewID); ListAdapter customAdapter = new ListAdapter(MainActivity.this, R.layout.itemlistrow, yourData); yourListView.setAdapter(customAdapter); yourListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // When clicked, show a toast with the TextView text if(position == 0) { //code specific to first list item Intent myIntent = new Intent(MainActivity.this,CopperChimney.class); startActivity(myIntent); } } }); } } } </code></pre> Manifest <pre><code> <uses-permission android:name="android.permission.INTERNET"/> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".CopperChimney" android:label="@string/app_name" > </activity> </application> </code></pre> LogCat <pre><code>08-07 09:05:30.062: E/Buffer Error(408): Error converting result java.lang.NullPointerException 08-07 09:05:30.091: E/JSON Parser(408): Error parsing data org.json.JSONException: End of input at character 0 of 08-07 09:05:30.091: W/dalvikvm(408): threadid=9: thread exiting with uncaught exception (group=0x40015560) 08-07 09:05:30.111: E/AndroidRuntime(408): FATAL EXCEPTION: AsyncTask #1 08-07 09:05:30.111: E/AndroidRuntime(408): java.lang.RuntimeException: An error occured while executing doInBackground() 08-07 09:05:30.111: E/AndroidRuntime(408): at android.os.AsyncTask$3.done(AsyncTask.java:200) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.lang.Thread.run(Thread.java:1019) 08-07 09:05:30.111: E/AndroidRuntime(408): Caused by: java.lang.NullPointerException 08-07 09:05:30.111: E/AndroidRuntime(408): at com.MAIN_REF.findmybuffet.MainActivity$ParsingAsync.doInBackground(MainActivity.java:71) 08-07 09:05:30.111: E/AndroidRuntime(408): at com.MAIN_REF.findmybuffet.MainActivity$ParsingAsync.doInBackground(MainActivity.java:1) 08-07 09:05:30.111: E/AndroidRuntime(408): at android.os.AsyncTask$2.call(AsyncTask.java:185) 08-07 09:05:30.111: E/AndroidRuntime(408): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 08-07 09:05:30.111: E/AndroidRuntime(408): ... 4 more 08-07 09:05:32.721: E/WindowManager(408): Activity com.MAIN_REF.findmybuffet.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40521200 that was originally added here 08-07 09:05:32.721: E/WindowManager(408): android.view.WindowLeaked: Activity com.MAIN_REF.findmybuffet.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40521200 that was originally added here 08-07 09:05:32.721: E/WindowManager(408): at android.view.ViewRoot.<init>(ViewRoot.java:258) 08-07 09:05:32.721: E/WindowManager(408): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 08-07 09:05:32.721: E/WindowManager(408): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 08-07 09:05:32.721: E/WindowManager(408): at android.view.Window$LocalWindowManager.addView(Window.java:424) 08-07 09:05:32.721: E/WindowManager(408): at android.app.Dialog.show(Dialog.java:241) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ProgressDialog.show(ProgressDialog.java:107) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ProgressDialog.show(ProgressDialog.java:95) 08-07 09:05:32.721: E/WindowManager(408): at com.MAIN_REF.findmybuffet.MainActivity$ParsingAsync.onPreExecute(MainActivity.java:55) 08-07 09:05:32.721: E/WindowManager(408): at android.os.AsyncTask.execute(AsyncTask.java:391) 08-07 09:05:32.721: E/WindowManager(408): at com.MAIN_REF.findmybuffet.MainActivity.onCreate(MainActivity.java:42) 08-07 09:05:32.721: E/WindowManager(408): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 08-07 09:05:32.721: E/WindowManager(408): at android.os.Handler.dispatchMessage(Handler.java:99) 08-07 09:05:32.721: E/WindowManager(408): at android.os.Looper.loop(Looper.java:123) 08-07 09:05:32.721: E/WindowManager(408): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-07 09:05:32.721: E/WindowManager(408): at java.lang.reflect.Method.invokeNative(Native Method) 08-07 09:05:32.721: E/WindowManager(408): at java.lang.reflect.Method.invoke(Method.java:507) 08-07 09:05:32.721: E/WindowManager(408): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-07 09:05:32.721: E/WindowManager(408): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-07 09:05:32.721: E/WindowManager(408): at dalvik.system.NativeStart.main(Native Method) </code></pre> Thanks,
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<android><json><listview>
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Error in launching an activity from list view
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.