title: How to add/remove Fragment on Button click?
body: <p>At present I have got a "RELATIVE_LAYOUT" container which I am using for adding my fragment.
  I am using OnClickListener on a button to load the fragment XML layout into the RelativeLayout container.</p>
  
  <p>What I want to achieve is that when I press the button once, the fragment should load...and when I press it again the fragment should be removed. I've already tried using integer to identify if fragment is loaded, but failed.
  Any help Appreciated...</p>
  
  <p>CODE:</p>
  
  <pre><code>public class MainActivity extends Activity {
      Button B1,B2;
      int boolb1=0, boolb2=0;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          B1 = (Button)findViewById(R.id.btn1);
          B2 = (Button)findViewById(R.id.btn2);
  
          B1.setOnClickListener(new OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  FragmentManager fm = getFragmentManager();
                  FragmentTransaction ft = fm.beginTransaction();
                  FragmentOne f1 = new FragmentOne();
  
                  if(boolb1==0)
                  {ft.add(R.id.frg1, f1);
                  ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                  boolb1=1;}
                  else
                  {ft.remove(f1);
                  ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
                  boolb1=0;}
                  //ft.addToBackStack("f1");
                  ft.commit();
              }
          });
  
          B2.setOnClickListener(new OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  FragmentManager fm = getFragmentManager();
                  FragmentTransaction ft = fm.beginTransaction();
                  FragmentTwo f2 = new FragmentTwo();
  
                  if(boolb2==0) {
                     ft.add(R.id.frg2, f2);
                     ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
                     boolb2=1;
                  } else {
                     ft.remove(f2);
                     ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
                     boolb2=0;
                  }
  
                  //ft.addToBackStack("f2");
                  ft.commit();
              }
          });
      }
  </code></pre>