title: How to setOnGoing(false) if CheckBox is unchecked?
body: <p>I want to setOnGoing on my notification method to false when the CheckBox is unchecked but my code doesn't work. I am new to the notifications on Android but I'm a bit familiar with Android and Java. 
  Thanks for the help.
  (Had to add detail as StackOverflow asked for it) </p>
  
  <p>Here's my code:</p>
  
  <pre><code>package com.arvisapps.lazyscreenshot;
  
  import android.app.Activity;
  import android.app.Notification;
  import android.app.NotificationManager;
  import android.os.Bundle;
  import android.support.v4.app.NotificationCompat;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.widget.CheckBox;
  import android.widget.CompoundButton;
  
  
  public class MainActivity extends Activity {
  
  
  NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
  
  private void showNotification() {
      builder.setAutoCancel(false);
      builder.setContentTitle("Take Screenshot");
      builder.setContentText("");
      builder.setSmallIcon(R.drawable.ic_notification);
      builder.setOngoing(true);
  
      Notification notification = builder.build();
      NotificationManager manager = (NotificationManager) this.getSystemService(NOTIFICATION_SERVICE);
      manager.notify(1, notification);
  }
  
  private void dontShowNotification(){
      builder.setOngoing(false);
  }
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      CheckBox cb1 = (CheckBox) findViewById(R.id.cb_1);
  
      cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
  
              if (isChecked == true) {
                  showNotification();
              }
  
              else if(isChecked == false)
              {
                  dontShowNotification();
              }
          }
      });
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.menu_main, menu);
      return true;
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      int id = item.getItemId();
  
      if (id == R.id.action_settings) {
          return true;
      }
  
      return super.onOptionsItemSelected(item);
  }
  
  
  }
  </code></pre>