Suppose there are 10 listView items on the screen and the 11th item is off the screen.I want to get all 11 pieces of data, but I don't know how to refer to the 11th piece of data.
If you execute the following code, you will get a null pointer exception when you try to get the 11th reference.
public void saveData(){
StringBuffer buffer = new StringBuffer();
int count = listView.getCount();
for(inti=0;i<count;i++){
Viewchild=listView.getChildAt(i);
TextView setText1=(TextView)child.findViewById (R.id.TextView1);
EditText=(EditText)child.findViewById(R.id.setText1);
String content1 = setText1.getText().toString().trim();
String content2 = text.getText().toString().trim();
buffer.append(content1);
buffer.append(",");
buffer.append(content2);
buffer.append(",");
}
}
public class CustomAdapter extensions ArrayAdapter <String>{
publicCustomAdapter(Context context, List<String>num_set){
super(context, R.layout.custom_row, num_set);
}
@ Override
publicView getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=LayoutInflater.from(getContext());
View CustomView=inflater.inflate(R.layout.custom_row, parent, false);
String[] num=getItem(position).split(",");
TextView setText1=(TextView)CustomView.findViewById (R.id.TextView1);
EditText setText2=(EditText)CustomView.findViewById (R.id.setText2);
setText1.setText(num[0]);
setText2.setText(num[1]);
return CustomView;
}
}
Instead of retrieving data from ListView, use the Adapter.Assume you are using CustomAdapter.
public void saveData(){
StringBuffer buffer = new StringBuffer();
CustomAdapter=(CustomAdapter)listView.getAdapter();
for (inti=0, length=adapter.getCount(); i<length;i++){
String [ ] rowData=adapter.getItem(i).split(",");
buffer.append(String.format("%s,%s,", rowData[0].trim(), rowData[1].trim()));
}
}
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