fetching checkbox state in a gridview item for all checkbox in gridview on button click
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06-07-2021 - |
Question
I have the code below, now I need to keep track of the checkbox state in each gridview item, and fetch that info on a button click to update the information. My button event in the calling activity of imageadapter for a gridview.
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
ImageView imgView = null;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater ltInflate = (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
convertView = ltInflate.inflate(R.layout.griditem, null);
holder.textview1 = (TextView) convertView.findViewById(R.id.grid_item_alert_date);
holder.textview2 = (TextView) convertView.findViewById(R.id.grid_item_alert_time);
holder.textview3 = (TextView) convertView.findViewById(R.id.grid_item_alert_type);
holder.imageview = (ImageView) convertView.findViewById(R.id.grid_item_image);
holder.checkbox = (CheckBox) convertView.findViewById(R.id.checkbox_ack);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked)
{
//Accessing or saving position to a List doesn't work here
//How to add ? info to a list here...
}
} });
holder.textview1.setText("Text 1 ");
holder.textview2.setText("Text 2 ");
holder.textview3.setText("Text 3 ");
holder.checkbox.setChecked(false);
holder.imageview.setImageBitmap(bitmap);
holder.id = position;
return convertView;
}
In the activity:
private OnClickListener UpdateButtonListener =
new OnClickListener(){
public void onClick(View v)
{
//CheckBox ckbocx = (CheckBox) findViewById(R.id.checkbox_ck);
//Need info on all the checkboxes for each gridview item
};
Any clues, hints are more than welcome.
Solution
Deal with integer array to store the state of your checkboxes when it checked/unchecked, Initially fill the array with 0 values which indicate unchecked of your checkboxes like this.
int[] checkStates;
checkStates = new int[datalist.length()];
for (int i = 0; i < datalist.length(); i++) {
checkStates[i] = 0;
}
Now handle checkboxes click event to get perfect position. use settag & get gettag and inside click event when box get selected change the value of particular position to 1 from 0.
Like this#
checkbox.setTag(position);
checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
pos = (Integer) buttonView.getTag();
// checkStates[pos] = 1;
// pos = (Integer) v.getTag();
if (!buttonView.isChecked()) {
boxState[pos] = 0;
} else {
boxState[pos] = 1;
}
notifyDataSetChanged();
}
});
and inside getview method handle your check/uncheck state this way..
if (checkStates[position] == 0) {
checkbox.setChecked(false); // set unchecked"
} else {
checkbox.setChecked(true); // set checked"
}
This way you will get the info of checkboxes which are selected, further handle your button click event, and get the int array which filled while check and uncheck.