I am struggling with this error: I created a custom array Adapter, and I have a null pointer exception on the getView method when I try to access a textview that I initialised with findviewbyid:
private class MarkerArrayAdapter extends ArrayAdapter<MarkerWrapper> {
private ArrayList<MarkerWrapper> markerList;
public MarkerArrayAdapter(Context context, int textViewResourceId,
ArrayList<MarkerWrapper> markersList) {
super(context, textViewResourceId, markersList);
this.markerList = markersList;
}
private class ViewHolder {
TextView ID_marker;
TextView chr;
TextView position;
TextView risk_allele;
TextView ref_allele;
TextView genome_patient;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
// Log.v("ConvertView", String.valueOf(position));
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.raw_data_item, null);
holder = new ViewHolder();
holder.ID_marker = (TextView) findViewById(R.id.raw_data_report_textview_1);
holder.chr = (TextView) findViewById(R.id.raw_data_report_textview_2);
holder.position = (TextView) findViewById(R.id.raw_data_report_textview_3);
holder.risk_allele = (TextView) findViewById(R.id.raw_data_report_textview_4);
holder.ref_allele = (TextView) findViewById(R.id.raw_data_report_textview_5);
holder.genome_patient = (TextView) findViewById(R.id.raw_data_report_textview_6);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
MarkerWrapper marker = markerList.get(position);
//NullPointer on this line
holder.ID_marker.setText(marker.getID_marker());
holder.chr.setText(marker.getChr());
holder.position.setText(marker.getPosition());
holder.risk_allele.setText(marker.getRisk_allele());
holder.ref_allele.setText(marker.getRef_allele());
holder.genome_patient.setText(marker.getGenome_patient());
return convertView;
}
}
My raw_data_item.xml looks like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="6dip" >
<TextView
android:id="@+id/raw_data_report_textview_1"
android:layout_width="22dp"
android:layout_height="fill_parent"
android:layout_weight="0.90"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/raw_data_report_textview_2"
android:layout_width="14dp"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/raw_data_report_textview_3"
android:layout_width="38dp"
android:layout_height="fill_parent"
android:layout_weight="0.35"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/raw_data_report_textview_4"
android:layout_width="36dp"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/raw_data_report_textview_5"
android:layout_width="44dp"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/raw_data_report_textview_6"
android:layout_width="85dp"
android:layout_height="fill_parent"
android:textAppearance="?android:attr/textAppearanceSmall" />
I saw a lot of people having the same probleme, but none of their's answer worked for me, so I would really appreciate your help.
04-19 11:05:03.657: E/AndroidRuntime(2229): FATAL EXCEPTION: main
04-19 11:05:03.657: E/AndroidRuntime(2229): Process: PID: 2229
04-19 11:05:03.657: E/AndroidRuntime(2229): java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
04-19 11:05:03.657: E/AndroidRuntime(2229): at RawDataReportActivity$MarkerArrayAdapter.getView(RawDataReportActivity.java:162)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.AbsListView.obtainView(AbsListView.java:2842)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.ListView.makeAndAddView(ListView.java:1884)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.ListView.fillDown(ListView.java:713)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.ListView.fillFromTop(ListView.java:779)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.ListView.layoutChildren(ListView.java:1693)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.AbsListView.onLayout(AbsListView.java:2632)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:2102)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1956)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.LinearLayout.onLayout(LinearLayout.java:1865)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:801)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:494)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.View.layout(View.java:16550)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewGroup.layout(ViewGroup.java:5303)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2308)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2021)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1180)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6558)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.Choreographer.doCallbacks(Choreographer.java:590)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.Choreographer.doFrame(Choreographer.java:560)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.os.Handler.handleCallback(Handler.java:739)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.os.Handler.dispatchMessage(Handler.java:95)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.os.Looper.loop(Looper.java:145)
04-19 11:05:03.657: E/AndroidRuntime(2229): at android.app.ActivityThread.main(ActivityThread.java:5832)
04-19 11:05:03.657: E/AndroidRuntime(2229): at java.lang.reflect.Method.invoke(Native Method)
04-19 11:05:03.657: E/AndroidRuntime(2229): at java.lang.reflect.Method.invoke(Method.java:372)
04-19 11:05:03.657: E/AndroidRuntime(2229): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
04-19 11:05:03.657: E/AndroidRuntime(2229): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
I think you are not calling findViewById on the convertView.I think your if loop should be like below
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.raw_data_item, null);
holder = new ViewHolder();
holder.ID_marker = (TextView) convertView.findViewById(R.id.raw_data_report_textview_1);
holder.chr = (TextView) convertView.findViewById(R.id.raw_data_report_textview_2);
holder.position = (TextView) convertView.findViewById(R.id.raw_data_report_textview_3);
holder.risk_allele = (TextView) convertView.findViewById(R.id.raw_data_report_textview_4);
holder.ref_allele = (TextView) convertView.findViewById(R.id.raw_data_report_textview_5);
holder.genome_patient = (TextView) convertView.findViewById(R.id.raw_data_report_textview_6);
convertView.setTag(holder);
}
I think you have written this class inside an activity, so you are trying to find those views inside activity layout.