title: NumberFormatException Error
body: <p>the code is: </p>
  
  <pre><code>editText2=(EditText) findViewById(R.id.editText2);
  editText3=(EditText) findViewById(R.id.editText3);
  float from_value= Float.parseFloat(editText2.getText().toString());
  editText3.setText(" "+(from_value * 100.0));
  </code></pre>
  
  <p>And the logcat error is: </p>
  
  <blockquote>
    <p>03-18 03:19:07.847: E/AndroidRuntime(875): Caused by: java.lang.NumberFormatException: Invalid float: ""</p>
  </blockquote>