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POListView with CustomAdapter giving NullPointer Exception
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copied!<p>I am using one <code>listview</code> to show details of places. For that i had created one <code>CustomAdapter</code> but i don't know why it is giving me <code>Null Pointer Exception</code> please help me to sort this problem.</p> <p>This is my xml file.</p> <p>activity_main.xml</p> <pre><code> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <ListView android:id="@+id/list" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical" /> </LinearLayout> </code></pre> <p>list_item.xml </p> <pre><code><?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:id="@+id/img_hotel" android:layout_width="100dp" android:layout_height="match_parent" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/txt_hotelName" android:layout_width="fill_parent" android:layout_height="20dp" /> <TextView android:id="@+id/txt_hotelAddress" android:layout_width="fill_parent" android:layout_height="20dp" /> <RatingBar android:id="@+id/ratingBar" style="?android:attr/ratingBarStyleIndicator" android:layout_width="wrap_content" android:layout_height="wrap_content" android:numStars="5" android:rating="2.0" android:stepSize="0.5" /> </LinearLayout> </LinearLayout> </RelativeLayout> </code></pre> <p>This is my updated Custom Adapter </p> <pre><code>public class CustomListViewAdapter extends BaseAdapter { Context context; public CustomListViewAdapter(Context context, int resource, List<Result> results) { // super(context, resource, results); this.context = context; Log.v("Result Data in Adapter", results.toString()); // TODO Auto-generated constructor stub } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder = null; Result result = (Result) getItem(position); LayoutInflater mInflater = (LayoutInflater) context .getSystemService(Activity.LAYOUT_INFLATER_SERVICE); // LayoutInflater mInflater = (LayoutInflater) // context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); if (convertView == null) { convertView = mInflater.inflate(R.layout.list_item, null); holder = new ViewHolder(); holder.imgView = (ImageView) convertView .findViewById(R.id.img_hotel); holder.txtName = (TextView) convertView .findViewById(R.id.txt_hotelName); holder.txtAddress = (TextView) convertView .findViewById(R.id.txt_hotelAddress); holder.rate = (RatingBar) convertView .findViewById(R.id.ratingBar); convertView.setTag(holder); } else { /* * holder = (ViewHolder) convertView.getTag(); * * String url = result.icon; Log.e("URL is ", url); if (url != * null) { Bitmap bitmap = fetchBitmapFromCache(url); if (bitmap * == null) { new * BitmapDownloaderTask(holder.imgView).execute(url); } else { * holder.imgView.setImageBitmap(bitmap); } } else { * holder.imgView.setImageBitmap(null); } */ holder.imgView.setImageDrawable(getResources().getDrawable( R.drawable.ic_launcher)); holder.txtName.setText(result.name); holder.txtAddress.setText(result.formatted_address); holder.rate.setRating(result.rating); } return convertView; // super.getView(position, convertView, parent); } private class ViewHolder { ImageView imgView; TextView txtName; TextView txtAddress; RatingBar rate; } @Override public int getCount() { // TODO Auto-generated method stub return results.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return results.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return results.indexOf(getItem(position)); } </code></pre> <p>}</p> <p>And here i have set the adapter to listView</p> <pre><code>list.setAdapter(new CustomListViewAdapter(MainActivity.this, R.layout.list_item, results)); </code></pre> <p>This is my updated code upto now but it is still giving me null pointer exception.</p> <p>and this is my stack strace.</p> <pre><code>03-13 11:13:20.355: E/AndroidRuntime(413): FATAL EXCEPTION: main 03-13 11:13:20.355: E/AndroidRuntime(413): java.lang.NullPointerException 03-13 11:13:20.355: E/AndroidRuntime(413): at com.th.hotelreservationsystem.MainActivity$CustomListViewAdapter.getView(MainActivity.java:183) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.AbsListView.obtainView(AbsListView.java:1294) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.ListView.onMeasure(ListView.java:1109) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.View.measure(View.java:8171) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:696) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.LinearLayout.onMeasure(LinearLayout.java:306) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.View.measure(View.java:8171) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.View.measure(View.java:8171) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.View.measure(View.java:8171) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.View.measure(View.java:8171) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.os.Handler.dispatchMessage(Handler.java:99) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.os.Looper.loop(Looper.java:123) 03-13 11:13:20.355: E/AndroidRuntime(413): at android.app.ActivityThread.main(ActivityThread.java:4627) 03-13 11:13:20.355: E/AndroidRuntime(413): at java.lang.reflect.Method.invokeNative(Native Method) 03-13 11:13:20.355: E/AndroidRuntime(413): at java.lang.reflect.Method.invoke(Method.java:521) 03-13 11:13:20.355: E/AndroidRuntime(413): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 03-13 11:13:20.355: E/AndroidRuntime(413): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 03-13 11:13:20.355: E/AndroidRuntime(413): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Please help me friends. </p>

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