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POAndroid Listview with viewPager not working
 

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  1. POAndroid Listview with viewPager not working
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    <p>I´m having a problem with this code....It results in NULL when a instanciate item and i really don´t know what´s the problem.Can someone please help?? What is the comon error in this situation?</p> <pre><code>public class DisplayActivity extends SherlockFragmentActivity { final static int NUM_ITEMS = 9; private final String TAG="links"; String keyword; MyAdapter mAdapter; ViewPager mPager; static ArrayAdapter&lt;String&gt; adapter; static View v; static ListView tv; static ArrayList&lt;ArrayList&lt;String&gt;&gt; items=new ArrayList&lt;ArrayList&lt;String&gt;&gt;(); searchTask exec; static String sites[]={"http://www.record.pt/","http://www.dn.pt/inicio","http://www.jn.pt", "http://www.publico.pt/?fullsite=true","http://www.abola.pt/?m=1", "http://www.economico.sapo.pt/?version=desktop&amp;redirect=/","http://www.ojogo.pt", "http://www.expresso.sapo.pt","http://www.jornaldenegocios.pt","http://www.cmjornal.xl.pt" }; @Override public void onBackPressed(){ android.os.Process.killProcess(android.os.Process.myPid()); //DisplayActivity.this.finish(); } @SuppressLint( "NewApi") @Override protected void onCreate(Bundle savedInstanceState){ ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); //getWindow().setWindowAnimations(17432586); super.onCreate(savedInstanceState); setContentView(R.layout.activity_display); searchTask exec=new searchTask(); exec.execute(sites); mPager = (ViewPager)findViewById(R.id.pager); mAdapter=new MyAdapter(); mPager.setAdapter(mAdapter); Intent intent = getIntent(); keyword =intent.getStringExtra(MainActivity.EXTRA_INPUTKEY); keyword.toLowerCase(); //Make sure we're running on Honeycomb or higher to use ActionBar APIs //if (Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB) { //Show the Up button in the action bar. // getActionBar().setDisplayHomeAsUpEnabled(true); //} } public static class MyAdapter extends PagerAdapter { @Override public void destroyItem(View collection, int position, Object view) { //Util.Log("destroying" + position); ((ViewPager) collection).removeView((View) view); } @Override public Object instantiateItem(View collection, int position) { LayoutInflater inflater = (LayoutInflater) collection.getContext() .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View page=inflater.inflate(R.layout.activity_display_list, null); ListView tv=(ListView) page.findViewById(android.R.id.list); tv.setAdapter(adapter); if (items.get(position).size() &gt; 0){ for(int i=0; i &lt; items.get(position).size();i++){ adapter.add(items.get(position).get(i)); } } ((ViewPager) collection).addView(page, position); adapter.notifyDataSetChanged(); return page; } public MyAdapter() { super(); } @Override public int getCount() { return NUM_ITEMS; } @Override public boolean isViewFromObject(View view, Object object) { return view == ((View) object); } } //***********************Fazer o add das listas aqui*************************** //Creates a new Task to execute the various getHtmlCode public class searchTask extends AsyncTask&lt;String, Elements, Elements&gt; { int number=0; @Override protected Elements doInBackground(String... params) { Thread.currentThread().setPriority(Thread.MAX_PRIORITY); for(int i=0 ; i &lt; params.length;i++){ Elements aux=getHtmlCode(params[i]); publishProgress(aux); } return null; } protected void onProgressUpdate(Elements... elem) { int index=0; ArrayList&lt;String&gt; aux=new ArrayList&lt;String&gt;(); for(Element link:elem[0]){ if(link.text().toLowerCase().contains(keyword)){ aux.add(index, link.text()); index++; } } items.add(number, aux); number++; } protected void onPostExecute(Elements aux){ //adapter.add("---------END---------"); //adapter.notifyDataSetChanged(); } } //parsing the html public Elements getHtmlCode(String url) { try { Document doc = Jsoup.connect(url).get(); Elements content=doc.select("a[href]"); return content; } catch (IOException e) { DisplayActivity.this.finish(); Log.e(TAG, "Failed to load HTML code", e); // Also tell the user that something went wrong (keep it simple, // no stacktraces): //Toast.makeText(this, "Failed to load HTML code", // Toast.LENGTH_SHORT).show(); } return null; } </code></pre> <p>}</p> <pre><code>09-09 21:02:38.239: E/AndroidRuntime(19656): FATAL EXCEPTION: main 09-09 21:02:38.239: E/AndroidRuntime(19656): java.lang.NullPointerException 09-09 21:02:38.239: E/AndroidRuntime(19656): at com.newsfinder.DisplayActivity$MyAdapter.instantiateItem(DisplayActivity.java:109) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.support.v4.view.PagerAdapter.instantiateItem(PagerAdapter.java:110) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.support.v4.view.ViewPager.populate(ViewPager.java:783) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.View.measure(View.java:8313) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.ViewRoot.performTraversals(ViewRoot.java:845) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.view.ViewRoot.handleMessage(ViewRoot.java:1866) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.os.Handler.dispatchMessage(Handler.java:99) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.os.Looper.loop(Looper.java:130) 09-09 21:02:38.239: E/AndroidRuntime(19656): at android.app.ActivityThread.main(ActivityThread.java:3687) 09-09 21:02:38.239: E/AndroidRuntime(19656): at java.lang.reflect.Method.invokeNative(Native Method) 09-09 21:02:38.239: E/AndroidRuntime(19656): at java.lang.reflect.Method.invoke(Method.java:507) 09-09 21:02:38.239: E/AndroidRuntime(19656): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 09-09 21:02:38.239: E/AndroidRuntime(19656): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625) 09-09 21:02:38.239: E/AndroidRuntime(19656): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. USMarcin S.
    1. USPedro Andrade
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