How to add a listener for flags in the form of an adapter, Android, ArrayAdapter, onCheckedChanged, OnCheckedChangeListener

Question

I have a listView that, through the ArrayAdapter, is populated with small xml submenus. each small view has only two things inside, a checkbox and a string label next to it.

I want to set the onCheckedChanged listener to capture a user event that checks or unchecks the checkboxes.

for example, the listener shown here:

listView.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) { Toast.makeText(this, "box has been checked", Toast.LENGTH_SHORT).show(); } 

}

Where can I put the listener code? and how to configure it?

for ArrayAdapter:

  public class MobileArrayAdapter extends ArrayAdapter<CheckBoxInfo>{ CheckBoxInfo[] objects; Context context; int textViewResourceId; public MobileArrayAdapter(Context context, int textViewResourceId, CheckBoxInfo[] objects) { super(context, textViewResourceId, objects); this.context = context; this.textViewResourceId = textViewResourceId; this.objects = objects; } @Override public View getView(int position, View convertView, ViewGroup parent) { View row_layout_view = convertView; if ((row_layout_view == null)){ LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); row_layout_view = inflater.inflate(R.layout.row_layout, null); } //CheckBoxInfo item = objects.get(position); // for arrayList CheckBoxInfo item = objects[position]; if(item != null){ TextView textView = (TextView) row_layout_view.findViewById(R.id.textView1); CheckBox checkBox = (CheckBox) row_layout_view.findViewById(R.id.checkBox1); if(item !=null){ textView.setText(item.checkBoxName); checkBox.setChecked(item.checkBoxState); } } return row_layout_view; } } 

Answer 1

Do not use your sample code listView.setOnCheckedChangeListener or onCheckedChanged .

First of all, for CheckBox you should use setOnClickListener() instead of setOnCheckedChangeListener() . You can get the checked state inside the onClick() function.

Secondly, place setOnClickListener() inside the getView() function of the list adapter.

An example :

 checkBox.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { final boolean isChecked = checkBox.isChecked(); // Do something here. } }); 

Answer 2

Thanks David! regarding the HukeLau_DABA comment, I solved it by updating the list view object using the CheckBox value inside OnClickListener (). In my case, I have a list of places, as can be seen in the following code:

 holder.placeCheckBox.setOnClickListener(new View.OnClickListener() { //please note that objPlace, position and holder must be declared //as final inside the getView() function scope. @Override public void onClick(View arg0) { final boolean isChecked = holder.placeCheckBox.isChecked(); if (isChecked){ objPlace.setItemChecked("yes"); }else{ objPlace.setItemChecked("no"); } placesList.set(position,objPlace); // updating the list with the updated object } }); 

Answer 3

do not refer to "holder.placeCheckBox" in your onClickListener, you must reference the view that is passed to onClick and sends it to the CheckBox, so the code should look like this:

 holder.placeCheckBox.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { boolean isChecked = ((CheckBox)arg0).isChecked(); if (isChecked){ objPlace.setItemChecked("yes"); }else{ objPlace.setItemChecked("no"); } placesList.set(position,objPlace); // updating the list with the updated object } }); 

Answer 4

You can try the following:

 holder.placeCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton compoundButton, boolean b) { Log.d(TAG, "onCheckedChanged: " + holder.placeCheckBox.getText() + " " + (b ? "selected":"deselected")); } });