android - 添加后删除 fragment 不起作用

Question

我的问题是我想从 Activity 中删除一个 Fragment。有两个步骤:

1. 通过选中 CheckBox，将 Fragment 添加到 FrameLayout (R.id.frame_for_des_details) 中。

2. 通过单击 TextView 删除 Fragment

   public class CreateTripActivity extends FragmentActivity {
   
   //Vars for Destination Fragment
   private CheckBox checkBox;
   private DestinationDetailsFragment destinationDetailsFragment;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   
   //Setting the ContentView
   setContentView(R.layout.activity_create_trip);
   
   //Set the Destination Checkbox listener
   checkBox = (CheckBox) this.findViewById(R.id.checkBox_destination_now);
   

CheckBox 的监听器:

    checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

            //Adding the Fragment. THIS WORK
            destinationDetailsFragment = new DestinationDetailsFragment();
            FragmentManager fm = getFragmentManager();
            fm.beginTransaction().add(R.id.frame_for_des_details, destinationDetailsFragment).commit();

        }
    });

TextView 的监听器:

    findViewById(R.id.label_later).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //Removing the Fragment. DOES NOT WORK
            FragmentManager fm = getFragmentManager();
            fm.beginTransaction().remove(destinationDetailsFragment).commit();              
        }
    });

    }

当我检查 CheckBox 时，我可以看到 fragment 。但是当我单击 TextView 将其删除时，它仍然存在。 当我一次又一次地检查 CheckBox 时，新的 Fragment 似乎覆盖了旧的 fragment ，因此我可以在 EditText 中覆盖占位符。

我希望有人理解我并能帮助我。

谢谢。

Answer 1

试试 android.support.v4.app.FragmentManager。这是代码。

        destinationDetailsFragment = new DestinationDetailsFragment();
    checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton compoundButton,
                boolean b) {

            // Adding the Fragment. THIS WORK

            FragmentManager fm = getSupportFragmentManager();
            fm.beginTransaction()
                    .add(R.id.frame_for_des_details,
                            destinationDetailsFragment).commit();

        }
    });
    findViewById(R.id.label_later).setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    FragmentManager fm = getSupportFragmentManager();
                    fm.beginTransaction()
                            .remove(destinationDetailsFragment).commit();
                }
            });