I am changing image view icon on click of image View but when it returns null pointer exception error in list view.
here is my code. Please help me out from this
public class SelectTagAdapter extends BaseAdapter implements Filterable {
Context context;
ArrayList<TagDataModel> arrayList;
LayoutInflater inflater=null;
FilterSearchListener filterSearchListener;
String selectedTag;
TagDatabaseHelper tagDatabaseHelper;
SelectTagActivity tagActivity;
String tagType;
static int AT_TAG_TYPE=1;
static int HASH_TAG_TYPE=0;
Holder holder=null;
View view;
public SelectTagAdapter(Context con,ArrayList arr,String tagType){
this.context=con;
this.arrayList=arr;
this.tagType = tagType;
inflater = ( LayoutInflater )context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
tagActivity=(SelectTagActivity)context;
tagDatabaseHelper = new TagDatabaseHelper(context);
}
public void setFilterListener(FilterSearchListener filterSearchListener) {
this.filterSearchListener=filterSearchListener;
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public Object getItem(int position) {
return arrayList.get(position);
}
@Override
public long getItemId(int position) {
return arrayList.get(position).hashCode();
}
@Override
public int getItemViewType(int position) {
return arrayList.get(position).getViewType() ;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final TagDataModel tag=new TagDataModel();
View rowView=null;
int viewType = getItemViewType(position);
if(rowView==null) {
holder =new Holder();
switch (viewType)
{
case 0://For # type Tags
rowView = inflater.inflate(R.layout.tag_item_hash_type, null);
view = rowView;
holder.checked = (ImageView)rowView.findViewById(R.id.checked);
holder.relativeLayout = (RelativeLayout)rowView.findViewById(R.id.tag_realtivelayout);
holder.relativeLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getTagStatus("", position, holder, HASH_TAG_TYPE,view);
}
});
break;
case 1: // for @ type tags
rowView = inflater.inflate(R.layout.tag_item, null);
view = rowView;
holder.upIv = (ImageView) rowView.findViewById(R.id.up);
holder.downIv = (ImageView) rowView.findViewById(R.id.down);
holder.neutralIv = (ImageView) rowView.findViewById(R.id.neutral);
holder.exclamationIv = (ImageView) rowView.findViewById(R.id.exclamation);
holder.upIv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getTagStatus("up", position, holder,AT_TAG_TYPE,view);
}
});
holder.downIv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getTagStatus("down", position, holder,AT_TAG_TYPE,view);
}
});
holder.neutralIv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getTagStatus("neutral", position, holder,AT_TAG_TYPE,view);
}
});
holder.exclamationIv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getTagStatus("esclamation", position, holder,AT_TAG_TYPE,view);
}
});
break;
}
holder.title = (TextView) rowView.findViewById(R.id.row_title);
holder.subtitle = (TextView) rowView.findViewById(R.id.row_subtitle);
rowView.setTag(holder);
}else {
holder = (Holder) rowView.getTag();
}
holder.title.setText(arrayList.get(position).getTitle());
holder.subtitle.setText(arrayList.get(position).getSubtitle());
if(viewType==1) {
if (arrayList.get(position).getTagstatus() != null) {
if (arrayList.get(position).getTagstatus().equals("up")) {
holder.upIv.setImageResource(R.drawable.up);
}
if (arrayList.get(position).getTagstatus().equals("down")) {
holder.downIv.setImageResource(R.drawable.down);
}
if (arrayList.get(position).getTagstatus().equals("neutral")) {
holder.neutralIv.setImageResource(R.drawable.neutral);
}
if (arrayList.get(position).getTagstatus().equals("esclamation")) {
holder.exclamationIv.setImageResource(R.drawable.exclamation);
}
}
}else
{
if(arrayList.get(position).getTagstatus()!=null)
if(arrayList.get(position).getTagstatus().equals("true"))
{
holder.checked.setImageResource(R.drawable.tick_icon);
}
}
return rowView;
}
public static class Holder {
TextView title,subtitle;
ImageView upIv,downIv,neutralIv,exclamationIv,checked;
RelativeLayout relativeLayout;
}
@Override
public Filter getFilter() {
return new ListFilter();
}
public class ListFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
String constraintStr = constraint.toString().toLowerCase(Locale.getDefault());
FilterResults result = new FilterResults();
if (constraint != null && constraint.toString().length() > 0) {
ArrayList<TagDataModel> filterItems = new ArrayList<TagDataModel>();
synchronized (this) {
for (TagDataModel item : arrayList) {
if (item.getTitle().toLowerCase(Locale.getDefault()).startsWith(constraintStr)) {
filterItems.add(item);
}
}
result.count = filterItems.size();
result.values = filterItems;
}
} else {
synchronized (this) {
result.count = arrayList.size();
result.values = arrayList;
}
}
return result;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filterSearchListener.UpdateFilteredResult(constraint, results.values);
}
}
public interface FilterSearchListener{
public void UpdateFilteredResult(CharSequence constraint, Object results);
}
public void getTagStatus(String status ,int position,Holder holder,int tagViewType,View view)
{
switch (tagViewType) {
case 0:
if(arrayList.get(position).getTagstatus()=="true") {
if (tagDatabaseHelper.deleteTag(arrayList.get(position)) > 0) {
arrayList.remove(arrayList.get(position));
notifyDataSetChanged();
}
}else
{
holder.checked.setImageResource(R.drawable.tick_icon);
arrayList.get(position).setTagstatus("true");
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
if (tagType.contains("All_Tags"))
tagActivity.setVisibilitySelectedTagListView();
break;
case 1:
switch (status) {
case "up":
selectedTag = "up";
if (arrayList.get(position).getTagstatus() != null) {
if (arrayList.get(position).getTagstatus().equals(selectedTag)) {
if (tagDatabaseHelper.deleteTag(arrayList.get(position)) > 0) {
arrayList.remove(arrayList.get(position));
notifyDataSetChanged();
}
} else {
holder.upIv.setImageResource(R.drawable.up);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
} else {
holder.upIv.setImageResource(R.drawable.up);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
if (tagType.contains("All_Tags"))
tagActivity.setVisibilitySelectedTagListView();
break;
case "down":
selectedTag = "down";
if (arrayList.get(position).getTagstatus() != null) {
if (arrayList.get(position).getTagstatus().equals(selectedTag)) {
if (tagDatabaseHelper.deleteTag(arrayList.get(position)) > 0) {
arrayList.remove(arrayList.get(position));
notifyDataSetChanged();
}
} else {
holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
} else {
holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
if (tagType.contains("All_Tags"))
tagActivity.setVisibilitySelectedTagListView();
break;
case "neutral":
selectedTag = "neutral";
if (arrayList.get(position).getTagstatus() != null) {
if (arrayList.get(position).getTagstatus().equals(selectedTag)) {
if (tagDatabaseHelper.deleteTag(arrayList.get(position)) > 0) {
arrayList.remove(arrayList.get(position));
notifyDataSetChanged();
}
} else {
**holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);**
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
} else {
****holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral);
holder.exclamationIv.setImageResource(R.drawable.exclamation_normal);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
if (tagType.contains("All_Tags"))
tagActivity.setVisibilitySelectedTagListView();
break;
case "esclamation":
selectedTag = "esclamation";
if (arrayList.get(position).getTagstatus() != null) {
if (arrayList.get(position).getTagstatus().equals(selectedTag)) {
if (tagDatabaseHelper.deleteTag(arrayList.get(position)) > 0) {
arrayList.remove(arrayList.get(position));
notifyDataSetChanged();
}
} else {
holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation);
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
} else {
holder.upIv.setImageResource(R.drawable.up_normal);
holder.downIv.setImageResource(R.drawable.down_normal);
holder.neutralIv.setImageResource(R.drawable.neutral_normal);
holder.exclamationIv.setImageResource(R.drawable.exclamation);
/*tag.setId(SelectTagActivity.selectedList.get(position).getId());
tag.setTitle(SelectTagActivity.selectedList.get(position).getTitle());
tag.setSubtitle(SelectTagActivity.selectedList.get(position).getSubtitle());*/
arrayList.get(position).setTagstatus(selectedTag);
tagDatabaseHelper.addUpdateTag(arrayList.get(position));
}
if (tagType.contains("All_Tags"))
tagActivity.setVisibilitySelectedTagListView();
break;
}
break;
}
}
}
Here's my logcat
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference
at com.analec.clientmanager.adapter.SelectTagAdapter.getTagStatus(SelectTagAdapter.java:369)
at com.abc.manager.adapter.SelectTagAdapter$3.onClick(SelectTagAdapter.java:139)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Code which is in bold showing null pointer exception.
