[android-developers] How to implement Tagging Functionality?

[sanarmal]

I am trying to implement tagging functionality in my app. When user enter 
"," then string before "," will be select as a tag and background color i 
need to assign this string(tag) so user can understand this is tag.
See following image.  

<https://lh5.googleusercontent.com/-clVP3IOy_z0/UrGDCaGuDJI/AAAAAAAABSI/_HzO5eO7fuo/s1600/tag_image1.png>

And after clicking backspace(Android soft keyboard button) then background 
color of the previous tag will change and if I click backspace again then 
previous tag will remove from EditText.

See following image.

<https://lh6.googleusercontent.com/-Rmt2_0r4HsA/UrGDiSwPrEI/AAAAAAAABSQ/ODswVa4QHzc/s1600/tag_image2.png>

Here what i done yet.

int i = 0;
names.addTextChangedListener(new TextWatcher() {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int 
count) {
            if(s.equals(","))
            {
                String strTag = names.getText().toString();
                int txtLength = strTag.length()+3;
                 tagArrray[i] = strTag;
                 i++;
                 names.setText("#"+strTag+"  ");
                 names.setSelection(txtLength, txtLength);
            }
        }
        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub              
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1,
                int arg2, int arg3) {
            // TODO Auto-generated method stub              
        }

        });   

*Where i stuck*

   - How to assign background to string(tag) which is in EditText(or border 
   to that string).
   - On clicking backspace change background color of last tag(may be i 
   have two tag like "android", "Droid" then it will change color of "Droid" 
   and clicking again backspace remove "Droid").

Please give me some hint or reference.

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