Hide keyboard when checkbox in ListView is clicked

Question

I currently have ListView where each Item has a TextView and a CheckBox. On top of the ListView is an EditText to search the ListView. When a user has searched something and clicks one of the CheckBoxes or scrolls in the list of given results, I'd like the keyboard to go away. How can I do this?

I've handled the keyboard in my other activities using the InputMethodManager, but I can't call it inside the adapter because the EditText is outside its scope and I can't call it in the activity using the adapter because as far as it's concerned nothing's changing when clicking the CheckBox.

Can anyone point me in the right direction?

Thanks in advance

Artem Zelinskiy · Accepted Answer · 2016-03-15T12:52:25.337

1

1) Pass an interface to your adapter

class MyActivity {
      public interface OnCheckBoxClickListener{
          public void OnCheckboxClicked();
      }

      public class MyOnCheckBoxClickListener :OnCheckBoxClickListener {

          private WeakReference<Context> mContext;

          public MyOnCheckBoxClickListener(Context context){
                 mContext = new WeakReference<Context>(context);
          }

          public void OnCheckboxClicked(){
          Context context = null;
          mContext.TryGetTarget(out context);

          var editText = (context as Activity).FindViewById<EditText>(Resource.Id.edittextId);
          editText.ClearFocus();
          }
      }

      YourListAdapter adapter = new YourListAdapter(new MyOnCheckBoxClickListener(this)); 
}

2) Then in your adapter:

    class YourListAdapter {

    OnCheckBoxClickListener mListener;

        public override View GetView(int position, View convertView, ViewGroup parent) {   
            //code for view generation
            var checkbox = convertView.FindViewById<Checkbox>(Resource.Id.YourCheckbox);
            checkbox.Click += (sender, args) => {
                mListener.OnCheckboxClicked();
            }
        }
    }

Also you can achieve same thing using delegates.

edited Mar 15 '16 at 12:52

answered Mar 15 '16 at 09:52

Artem Zelinskiy

2,201
16
19

1

What code should I use to dismiss the keyboard then? Normally I use (InputMethodManager)this.GetSystemService (Context.InputMethodService) but I can't use it since there is no Context. – Frederick Eskens Mar 15 '16 at 09:59
You create interface in your activity, then you pass it to Adapter constructor – Artem Zelinskiy Mar 15 '16 at 10:23
1

It says I can't use += operator on a boolean – Frederick Eskens Mar 15 '16 at 10:33
It is my mistake. Not ".Selected", but ".Click". I'll edit code again – Artem Zelinskiy Mar 15 '16 at 10:35
Ok, I'm getting there. Now I just need to figure out how to get the current focus. I can't get this out of the context I presume? – Frederick Eskens Mar 15 '16 at 10:39
1

Cast Context to Activity, and find your EditText with FindViewById – Artem Zelinskiy Mar 15 '16 at 10:42
Great, that was it. Thanks for your help! – Frederick Eskens Mar 15 '16 at 10:45
1

Great it helped. Do not miss WeakReference, or you will have memory leak! – Artem Zelinskiy Mar 15 '16 at 10:48
Can you explain a bit more so I understand for the future? – Frederick Eskens Mar 15 '16 at 10:49
1

Basically, you will have Strong reference in you adapter to your activity and activity will have strong reference to your adapter, both of them will never be cleared by GC. You can read more at http://www.dotnetperls.com/weakreference – Artem Zelinskiy Mar 15 '16 at 11:10

Guntars Ļuta · Answer 2 · 2016-03-15T09:47:49.500

0

You can use this function when you need to hide keyboard.

private void hideKeyboard() {
    View view = this.getCurrentFocus();
    if (view != null) {
        view.clearFocus();
        InputMethodManager inputManager = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
        inputManager.hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

You can use it on listView:

listView.setOnScrollListener(new AbsListView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        hideKeyboard();
    }
});

Or checkBox:

checkBox.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        hideKeyboard();
        ...
    }
});

edited Mar 15 '16 at 09:47

answered Mar 15 '16 at 09:43

Guntars Ļuta

61
2
10

Yes, I know. But I can't call this.getCurrentFocus() inside the adapter. – Frederick Eskens Mar 15 '16 at 09:44
Then you need to pass Context to your adapter – Guntars Ļuta Mar 15 '16 at 09:49
I don't think this is best practice, is it? – Frederick Eskens Mar 15 '16 at 09:50
Use `View view = ((Activity) mContext).getCurrentFocus();` and all will work. – Guntars Ļuta Mar 15 '16 at 09:51

Hide keyboard when checkbox in ListView is clicked

2 Answers2