SMS character counter for an edit text

To create a SMS character counter for an edittext text in your app, all you need is a Text Watcher. Text Watcher which listens to the change in text in the edit text. Through it you can listen to three events, they are: beforeTextChanged, onTextChanged, afterTextChanged. In this process we listen to onTextChanged. Here is the whole code you need to create the character counter:

 public class MainActivity extends ActionBarActivity {  
      int textLeft;  
      int smsNo = 1;  
      @Override  
      protected void onCreate(Bundle savedInstanceState) {  
           super.onCreate(savedInstanceState);  
           setContentView(R.layout.activity_main);  
           final TextView counter = (TextView) findViewById(R.id.textView1);  
           EditText edittext = (EditText) findViewById(R.id.edit_text1);  
           final TextWatcher watcher = new TextWatcher() {  
                public void beforeTextChanged(CharSequence s, int start, int count,  
                          int after) {  
                }  
                public void onTextChanged(CharSequence s, int start, int before,  
                          int count) {  
                     int sms = s.length() / 160;  
                     float d = (float) s.length() / 160;  
                     double textLeftt = 160 * (1 - (d - sms));  
                     textLeft = (int) Math.round(textLeftt);  
                     smsNo = sms + 1;  
                     counter.setText(textLeft + "/160 (" + smsNo + ")");  
                }  
                public void afterTextChanged(Editable s) {  
                }  
           };  
           edittext.addTextChangedListener(watcher);  
      }  
 } 

Here, SMS is the no of sms text messages, 160 is the standard no of characters an sms messages has. Emojis occupy two characters in an SMS message.