Java – how do I add / delete clips on buttons?

At present, I have a "relax_layout" container, which I use to add my clips

What I want to achieve is that when I press the button once, the clip should load... When I press it again, the clip should be deleted I have tried to use integers to identify whether fragments are loaded, but failed Any help appreciated

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();
            }
        });
    }

Solution

Your problem is that a new clip is created each time you click the button You need to get a reference to the currently added fragment and delete it

In addition, you no longer need to use this flag When you add a clip, you can mark it After deleting a clip, you can use the tag used to add the clip to get a reference to the currently added clip

Here is an example of how you should do this:

private Button B1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    B1 = (Button)findViewById(R.id.btn1);

    B1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            FragmentOne f = (FragmentOne) fm.findFragmentByTag("tag");

            if(f == null) {  // not added
                f = new FragmentOne();
                ft.add(R.id.frg1,f,"tag");
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);

            } else {  // already added

                ft.remove(f);
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
            }

            ft.commit();
        }
    });

    // and so on ...
}