Example of using TextWatcher

Example of using TextWatcher

package com.example.androidtextwatcher;

import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 EditText input;
 TextView info, cont;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  input = (EditText)findViewById(R.id.input);
  info = (TextView)findViewById(R.id.info);
  cont = (TextView)findViewById(R.id.cont);
  input.addTextChangedListener(myTextWatcher);
 }

 TextWatcher myTextWatcher =
   new TextWatcher(){

    @Override
    public void afterTextChanged(Editable s) {
     /* 
      * This method is called to notify you that, 
      * somewhere within s, the text has been changed.
      */
     //info.setText("");
     //cont.setText(s.toString());
    }

    @Override
    public void beforeTextChanged(CharSequence s, 
      int start, int count, int after) {
     /*
      * This method is called to notify you that, 
      * within s, the count characters beginning at 
      * start are about to be replaced by new text 
      * with length after.
      */
     info.setText("beforeTextChanged - " + start + " " + count + " " + after);
     cont.setText(s.toString());
    }

    @Override
    public void onTextChanged(CharSequence s, 
      int start, int before, int count) {
     /*
      * This method is called to notify you that, 
      * within s, the count characters beginning 
      * at start have just replaced old text that 
      * had length before.
      */
     info.setText("onTextChanged - " + start + " " + before + " " + count);
     cont.setText(s.toString());
    }};

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="android-coding.blogspot.com"
        android:textColor="#A00000"
        android:textStyle="bold|italic" />
    <EditText
        android:id="@+id/input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/cont"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>