title: Visible and invisible with a checkbox
body: <p>i have a screen with 5 lines.each line has 3 editTexts.after the 5th line there is a checkbox and below it another line with 3 edittexts.i would like,the 6th line to be invisible when i firstly open my app,and when the users checks the checkbox,the line to appear.is this possible?thanks</p>
  
  <pre><code>  final CheckBox checkbox = (CheckBox) findViewById(R.id.box);
              checkbox.setOnClickListener(new OnClickListener() {
                  public void onClick(View v) {
                      // Perform action on clicks, depending on whether it's now checked
                      if (((CheckBox) v).isChecked()) {
                         ?????????????
                      } else {
                         ???????????
                      }
                  }
              });
  </code></pre>