title: I have 4 edittext in 3 of them i give values,and in 4th edittext i have to display the sum of all 3 edittext values
body: <p>I have 4 edittext among 3 of them i give values,and in 4th edittext i have to display the sum of all 3 edittext values simultaneously without any button click</p>
  
  <p>If any one knows it means please help</p>
  
  <p>Here is my code:</p>
  
  <pre><code>EditText val1= (EditText) findViewById (R.id.editText1);
  EditText val2= (EditText) findViewById (R.id.editText2);
  EditText val3= (EditText) findViewById (R.id.editText3);
  EditText sum = (EditText) findViewById (R.id.editText4);    
  </code></pre>