How to use EditText TextChangedListener in Android

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#eae8e3"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:fontFamily="sans-serif-condensed"         android:padding="15dp"         android:layout_margin="15dp"         android:textSize="20dp"         />     <EditText         android:id="@+id/et"         android:layout_width="250dp"         android:layout_height="wrap_content"         android:padding="10dp"         android:hint="This is initial text"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.graphics.Color; 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 {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         simpulan EditText et = (EditText) findViewById(R.id.et);         simpulan TextView tv = (TextView) findViewById(R.id.tv);          /*             addTextChangedListener (TextWatcher watcher)                 Adds a TextWatcher to the list of those whose methods                 are called whenever this TextView's text changes.                  In 1.0, the afterTextChanged(Editable) method was erroneously                 not called after setText(char[], int, int) calls. Now, doing                 setText(char[], int, int) if there are any text changed                 listeners forces the buffer type to Editable if it                 would not otherwise be and does call this method.          */          /*             TextWatcher                 When an object of a type is attached to an Editable,                 its methods will be called when the text is changed.                  afterTextChanged(Editable s)                     This method is called to notify you that,                     somewhere within s, the text has been changed.                  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.                  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.          */          et.addTextChangedListener(new TextWatcher() {             @Override             public void beforeTextChanged(CharSequence s, int start, int count, int after) {                 // Do some thing now             }              @Override             public void onTextChanged(CharSequence s, int start, int before, int count) {                 // Change the TextView background color                 tv.setBackgroundColor(Color.YELLOW);                  // Get the EditText text and display it on TextView                 tv.setText(et.getText());             }              @Override             public void afterTextChanged(Editable s) {                 // Do something at this time             }         });     } }



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