I have created a list view as shown in this image.Link:
Problem: I want that if the user clicks on the button + or - the textview which is currently showing 0 is incremented or decremented accordingly. But if I click first item's button the textview is updated in some other row. I don't know how to implement this.
Here's code:
public class HomePage extends Fragment {
String[] listitems;
int[] images = { R.drawable.cadburysilk, R.drawable.cadburys_dairymilk,
R.drawable.perk, R.drawable.kitkat,
R.drawable.nestlemunchchocolate, R.drawable.cadbury_bournville_bar,
R.drawable.snickers };
ListView list;
DBAdapter dbadapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View rootview = inflater.inflate(R.layout.activity_home_page,
container, false);
View view = View.inflate(getActivity(), R.layout.headerview, null);
Resources res = getResources();
listitems = res.getStringArray(R.array.items);
list = (ListView) rootview.findViewById(R.id.itemslist);
list.addHeaderView(view);
AdapterClass adapterClass = new AdapterClass(this.getActivity(),
listitems, images);
list.setAdapter(adapterClass);
return rootview;
}
}
class AdapterClass extends ArrayAdapter<String> {
Context context;
int[] images;
String[] names;
Button add, sub;
TextView number;
Integer count=0;
static class ViewHolder {
public TextView textView;
public ImageView imageView;
}
public AdapterClass(Context c, String[] items, int imgs[]) {
// TODO Auto-generated constructor stub
super(c, R.layout.rowlayout, R.id.quantity, items);
this.context = c;
this.images = imgs;
this.names = items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View row = convertView;
// reuse views
if (row == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.rowlayout, parent, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.imageView = (ImageView) row.findViewById(R.id.img);
viewHolder.textView = (TextView) row.findViewById(R.id.textView1);
add = (Button) row.findViewById(R.id.button1);
add.setTag(position);
sub = (Button) row.findViewById(R.id.button2);
sub.setTag(position);
number = (TextView)row.findViewById(R.id.quantity);
row.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) row.getTag();
holder.imageView.setImageResource(images[position]);
holder.textView.setText(names[position]);
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count=count+1;
number.setText(count.toString());
}
});
sub.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count=count-1;
number.setText(count.toString());
}
});
return row;
}
}
Please help. Also i need help in how to show the items whose textview contains positive number in next activity or fragment.
Follow initial query with answer by user370305.
Please help. Also i need help in how to show the items whose textview contains positive number in next activity or fragment.
Create a data structure, I am taking a HashMap , where key is String.valueOf(position) and Value is count int.
You know the keys since it will be from position "0" to listitem.length. Using the key you can get the count values and check for positive ones.
Why Hashmap: because everytime you change count the new value will be overriden. (Only one unique key is maintained in hashmap).
(position = 0, count = 0) --> - clicked on 0th row--> (position 0 , count = -1) will be overriden on key = 0 cell.
Complete code (with number increment fix and having set of positive value in DataStructure):
public class HomePage extends Fragment {
String[] listitems;
int[] images = { R.drawable.cadburysilk, R.drawable.cadburys_dairymilk,
R.drawable.perk, R.drawable.kitkat,
R.drawable.nestlemunchchocolate, R.drawable.cadbury_bournville_bar,
R.drawable.snickers };
ListView list;
DBAdapter dbadapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View rootview = inflater.inflate(R.layout.activity_home_page,
container, false);
View view = View.inflate(getActivity(), R.layout.headerview, null);
Resources res = getResources();
listitems = res.getStringArray(R.array.items);
list = (ListView) rootview.findViewById(R.id.itemslist);
list.addHeaderView(view);
AdapterClass adapterClass = new AdapterClass(this.getActivity(),
listitems, images);
list.setAdapter(adapterClass);
return rootview;
//You can use adapterClass.getPositiveNumber(); to retrieve all positive rows and the values!
//Unique key will be String : 1,2,3....listitems.length.
}
}
class AdapterClass extends ArrayAdapter<String> {
Context context;
int[] images;
String[] names;
Button add, sub;
ViewHolder holder; // Since will be accessed inside onclick
HashMap<String,Integers> positiveNumbers = new HashMap<String,Integers>;
Integer count=0;
static class ViewHolder {
public TextView textView;
public ImageView imageView;
public TextView number;
public String uniqueKey;
}
public AdapterClass(Context c, String[] items, int imgs[]) {
// TODO Auto-generated constructor stub
super(c, R.layout.rowlayout, R.id.quantity, items);
this.context = c;
this.images = imgs;
this.names = items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View row = convertView;
// reuse views
if (row == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.rowlayout, parent, false);
ViewHolder viewHolder = new ViewHolder();
viewHolder.imageView = (ImageView) row.findViewById(R.id.img);
viewHolder.textView = (TextView) row.findViewById(R.id.textView1);
viewHolder.number = (TextView)row.findViewById(R.id.quantity);
viewHolder.uniqueKey = String.valueOf(position);
add = (Button) row.findViewById(R.id.button1);
add.setTag(position);
sub = (Button) row.findViewById(R.id.button2);
sub.setTag(position);
row.setTag(viewHolder);
}
holder = (ViewHolder) row.getTag(); //keeping one global memory
holder.imageView.setImageResource(images[position]);
holder.textView.setText(names[position]);
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count=count+1;
holder.number.setText(count.toString());
positiveNumbers.put(holder.uniqueKey,count); //Key -> String.valueOf(position) and Value -> int count
}
});
sub.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
count=count-1;
holder.number.setText(count.toString());
positiveNumbers.put(holder.uniqueKey,count); //Key -> String.valueOf(position) and Value -> int count
}
});
return row;
}
public Map<String,Integer> getPositiveNumbers()
{
return positiveNumbers;
}
}
p.s. I have typed in editor, there might be some compile time error. Also you can store objects of each row against the key so that when you get the positive count, you can get any other reference like the image, which I am guessing you would need to show later!