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POListview gives error
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  1. POListview gives error
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    copied!<p>I have a listview which shows a picture which is taken from drawable folder and a title. But it gives error. I couldn't determine the problem, so I couldn't make a good search to find a solution. Here is my classes:</p> <pre><code>public class Categories extends Activity { ListView EventCategories; String CategoryList[] = { "Sinema", "Tiyatro", "Spor Faaliyetleri", "Müzik", "Sahne Sanatları" }; int CategoryImageList[] = { R.drawable.sinema, R.drawable.tiyatro, R.drawable.spor, R.drawable.concert, R.drawable.sahnesanatlari }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.category_list); EventCategories = (ListView) findViewById(R.id.categorylist); final MyAdapter&lt;String&gt; categories = new MyAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1, R.id.categorylist, CategoryList); EventCategories.setAdapter(categories); } public class MyAdapter&lt;String&gt; extends ArrayAdapter&lt;String&gt; { @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); View row = inflater.inflate(R.layout.category_list_item, parent, false); //category list item has an Imageview and a Button ImageView icon = (ImageView) findViewById(R.id.categoryimage); Button category = (Button) findViewById(R.id.categorybutton); category.setText(CategoryList[position]); icon.setImageResource(CategoryImageList[position]); return row; } public MyAdapter(Context context, int resource, int textViewResourceId, String[] mylist) { super(context, resource, textViewResourceId, mylist); } } } </code></pre> <p>And this is the error. Line 44 is "category.setText(CategoryList[position]);"</p> <pre><code>02-25 02:46:06.415: E/AndroidRuntime(458): FATAL EXCEPTION: main 02-25 02:46:06.415: E/AndroidRuntime(458): java.lang.NullPointerException 02-25 02:46:06.415: E/AndroidRuntime(458): at com.example.example.Categories$MyAdapter.getView(Categories.java:44) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.AbsListView.obtainView(AbsListView.java:1315) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.ListView.makeAndAddView(ListView.java:1727) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.ListView.fillDown(ListView.java:652) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.ListView.fillFromTop(ListView.java:709) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.ListView.layoutChildren(ListView.java:1580) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.AbsListView.onLayout(AbsListView.java:1147) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.View.layout(View.java:7035) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.View.layout(View.java:7035) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.LinearLayout.onLayout(LinearLayout.java:1042) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.View.layout(View.java:7035) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.widget.FrameLayout.onLayout(FrameLayout.java:333) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.View.layout(View.java:7035) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.ViewRoot.performTraversals(ViewRoot.java:1045) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.os.Handler.dispatchMessage(Handler.java:99) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.os.Looper.loop(Looper.java:123) 02-25 02:46:06.415: E/AndroidRuntime(458): at android.app.ActivityThread.main(ActivityThread.java:4627) 02-25 02:46:06.415: E/AndroidRuntime(458): at java.lang.reflect.Method.invokeNative(Native Method) 02-25 02:46:06.415: E/AndroidRuntime(458): at java.lang.reflect.Method.invoke(Method.java:521) 02-25 02:46:06.415: E/AndroidRuntime(458): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 02-25 02:46:06.415: E/AndroidRuntime(458): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 02-25 02:46:06.415: E/AndroidRuntime(458): at dalvik.system.NativeStart.main(Native Method) </code></pre>
 

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