android.app.FragmentTransaction#remove ( )源码实例Demo

@Override
protected void detachTask()
{
    FragmentManager fm = getFragmentManager();
    if(fm!=null)
    {
        FragmentTransaction trans = fm.beginTransaction();
        trans.remove(this);
        LocationOpenerBaseFragment f = (LocationOpenerBaseFragment) fm.findFragmentByTag(getArguments().getString(ARG_OPENER_TAG));
        if(f!=null)
            trans.remove(f);
        trans.commitAllowingStateLoss();
        Logger.debug(String.format("TaskFragment %s has been removed from the fragment manager", this));
        onEvent(EventType.Removed, this);
    }
}
 

private void createAndAttachCaptionFragment(int containerId) {
	FragmentTransaction tx = getFragmentManager().beginTransaction();
	
	if (captionFragment != null) {
		tx.remove(captionFragment);
	}
	
	captionFragment = new CaptionFragment();
	Bundle args = new Bundle();
	if (video != null) {
		args.putString(Constants.PARAM_VIDEO_ID, video.getId());
		if (videoFragment != null) {
			args.putInt(PARAM_VIDEO_POSITION, videoFragment.getVideoPosition());
		}
	}
	// Set args even if empty to avoid possible NPE inside CaptionFragment.
	captionFragment.setArguments(args);
	captionFragment.registerCallbacks(this);
	
	tx.replace(containerId, captionFragment);
	tx.commit();
	// Force execute, so we can populateHeader afterward.
	getFragmentManager().executePendingTransactions();
}
 

void showDialog() {
    mStackLevel++;

    // DialogFragment.show() will take care of adding the fragment
    // in a transaction.  We also want to remove any currently showing
    // dialog, so make our own transaction and take care of that here.
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    Fragment prev = getFragmentManager().findFragmentByTag("dialog");
    if (prev != null) {
        ft.remove(prev);
    }
    ft.addToBackStack(null);

    // Create and show the dialog.
    DialogFragment newFragment = MyDialogFragment.newInstance(mStackLevel);
    newFragment.show(ft, "dialog");
}
 

/**
 * Opens the map represented by the specified portal item or if null, opens
 * a default map.
 *
 * @param portalItemId
 *            - String representing a portal resource
 * @param basemapPortalItemId
 *            - String representing a basemap portal item
 */
public void showMap(String portalItemId, String basemapPortalItemId) {
	// remove existing MapFragment explicitly, simply replacing it can cause
	// the app to freeze when switching basemaps
	FragmentTransaction transaction;
	FragmentManager fragmentManager = getFragmentManager();
	Fragment currentMapFragment = fragmentManager.findFragmentByTag(MapFragment.TAG);
	if (currentMapFragment != null) {
		transaction = fragmentManager.beginTransaction();
		transaction.remove(currentMapFragment);
		transaction.commit();
	}

	MapFragment mapFragment = MapFragment.newInstance(portalItemId, basemapPortalItemId);

	transaction = fragmentManager.beginTransaction();
	transaction.replace(R.id.maps_app_activity_content_frame, mapFragment, MapFragment.TAG);
	transaction.addToBackStack(null);
	transaction.commit();

	invalidateOptionsMenu(); // reload the options menu
}
 

private void showBluetoothTest() {
    int width;
    try {
        width = Integer.valueOf(edtWidth.getText().toString());
    } catch (Exception e) {
        width = 500;
    }
    String strQRCode = edtQRCode.getText().toString();
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    Fragment prev = getFragmentManager().findFragmentByTag(FRAGMENT_BLUETOOTH);
    if (prev != null) {
        ft.remove(prev);
    }
    ft.addToBackStack(null);
    BluetoothTestDialogFragment fragment = BluetoothTestDialogFragment
            .getFragment(type, width, height, strQRCode);
    fragment.show(ft, FRAGMENT_BLUETOOTH);
}
 

public static void showAbout(Activity activity) {

        FragmentManager fm = activity.getFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        Fragment prev = fm.findFragmentByTag("dialog_about");
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        new AboutDialog().show(ft,"dialog_about");
    }
 

private void goToFragment(String oldFragmentTag, String newFragmentTag, Fragment newFragment) {
    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
    fragmentTransaction.add(R.id.intro_frame, newFragment, newFragmentTag);
    Fragment fragment = getFragmentManager().findFragmentByTag(oldFragmentTag);
    if (fragment != null) {
        fragmentTransaction.remove(getFragmentManager().findFragmentByTag(oldFragmentTag));
    }
    fragmentTransaction.commit();
}
 

@Override
public void destroyItem(ViewGroup viewPager, int position, Object object) {
    if (position >= getCount()) {
        FragmentManager manager = ((Fragment) object).getFragmentManager();
        FragmentTransaction trans = manager.beginTransaction();
        trans.remove((Fragment) object);
        trans.commit();
    }
}
 

/**清空所有带此tag的fragment*/
public void removeAll(String tag){
    FragmentTransaction ft = fm.beginTransaction();
    for (Fragment f:fs) {
        if(f.getTag().equals(tag))ft.remove(f);
    }
    ft.commitAllowingStateLoss();
}
 

public static void showAboutDialog(Activity activity) {
    FragmentManager fm = activity.getFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    Fragment prev = fm.findFragmentByTag("dialog_about");
    if (prev != null) {
        ft.remove(prev);
    }
    ft.addToBackStack(null);

    new AboutDialog().show(ft, "dialog_about");
}
 

public static void showDialogFragment(final DialogFragment dialog,
                                      final String tag, final FragmentManager fragmentManager) {
  final FragmentTransaction ft = fragmentManager.beginTransaction();
  final Fragment prev = fragmentManager.findFragmentByTag(tag);
  if (prev != null) {
    ft.remove(prev);
  }
  ft.add(dialog, tag);
  ft.commitAllowingStateLoss();
}
 

private void showDialog(final HashMap strings, Object cryptoObject, FingerprintUiHelper.Callback callback) {
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        // DialogFragment.show() will take care of adding the fragment
        // in a transaction.  We also want to remove any currently showing
        // dialog, so make our own transaction and take care of that here.

        Activity activity = getCurrentActivity();
        if (activity == null) {
            callback.onError(AppConstants.E_INIT_FAILURE,
                    strings.containsKey("cancelled") ? strings.get("cancelled").toString() : "Authentication was cancelled");
            return;
        }

        FragmentTransaction ft = activity.getFragmentManager().beginTransaction();
        Fragment prev = getCurrentActivity().getFragmentManager().findFragmentByTag(AppConstants.DIALOG_FRAGMENT_TAG);
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        // Create and show the dialog.
        FingerprintAuthenticationDialogFragment newFragment = FingerprintAuthenticationDialogFragment.newInstance(strings);
        newFragment.setCryptoObject((FingerprintManager.CryptoObject) cryptoObject);
        newFragment.setCallback(callback);
        newFragment.show(ft, AppConstants.DIALOG_FRAGMENT_TAG);
    }
}
 

@Override
protected void onSaveInstanceState(Bundle outState) {
    if (twoPanel) {
        FragmentTransaction fragmentTransaction = this.getFragmentManager().beginTransaction();
        Fragment detailFragment = getFragmentManager().findFragmentByTag(DETAIL_FRAGMENT);
        if (detailFragment != null) {
            fragmentTransaction.remove(detailFragment);
        }
        fragmentTransaction.commit();
    }

    super.onSaveInstanceState(outState);
}
 

public static void showAbout(Activity activity) {
  FragmentManager fm = activity.getFragmentManager();
  FragmentTransaction ft = fm.beginTransaction();
  Fragment prev = fm.findFragmentByTag(ABOUT_DIALOG_TAG);
  if (prev != null) {
    ft.remove(prev);
  }
  ft.addToBackStack(null);

  new AboutDialog().show(ft, "about_dialog");
}
 

public static void showChangeLogDialog(FragmentManager fragmentManager) {
    ChangelogDialog changelogDialog = new ChangelogDialog();
    FragmentTransaction ft = fragmentManager.beginTransaction();
    Fragment prev = fragmentManager.findFragmentByTag("changelogdemo_dialog");
    if (prev != null) {
        ft.remove(prev);
    }
    ft.addToBackStack(null);
    changelogDialog.show(ft, "changelogdemo_dialog");
}
 

private void initializeFragments() {
    FragmentTransaction transaction = getFragmentManager().beginTransaction();
    Fragment mainFragment = getFragmentManager().findFragmentById(R.id.main_fragment);
    Fragment secondaryFragment = getFragmentManager().findFragmentById(R.id.secondary_fragment);
    if (mainFragment != null) {
        if (binding.secondaryFragment != null) {
            if (mainFragment instanceof ConversationFragment) {
                getFragmentManager().popBackStack();
                transaction.remove(mainFragment);
                transaction.commit();
                getFragmentManager().executePendingTransactions();
                transaction = getFragmentManager().beginTransaction();
                transaction.replace(R.id.secondary_fragment, mainFragment);
                transaction.replace(R.id.main_fragment, new ConversationsOverviewFragment());
                transaction.commit();
                return;
            }
        } else {
            if (secondaryFragment instanceof ConversationFragment) {
                transaction.remove(secondaryFragment);
                transaction.commit();
                getFragmentManager().executePendingTransactions();
                transaction = getFragmentManager().beginTransaction();
                transaction.replace(R.id.main_fragment, secondaryFragment);
                transaction.addToBackStack(null);
                transaction.commit();
                return;
            }
        }
    } else {
        transaction.replace(R.id.main_fragment, new ConversationsOverviewFragment());
    }
    if (binding.secondaryFragment != null && secondaryFragment == null) {
        transaction.replace(R.id.secondary_fragment, new ConversationFragment());
    }
    transaction.commit();
}
 

public void show(@NonNull final FragmentManager manager) {
    FragmentTransaction transaction = manager.beginTransaction();
    Fragment prev = manager.findFragmentByTag(DIALOG_TAG);
    if (prev != null) {
        transaction.remove(prev);
    }

    transaction.add(this, DIALOG_TAG);
    transaction.commitAllowingStateLoss();
    manager.executePendingTransactions();
}
 

/**
 * Se ha deseleccionado una pestaña. Se elimina de la pantalla
 */
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
	
	ft.remove(fragmento);
}
 

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    ft.remove(fragment);
}
 

public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    ft.remove(mFragment);
}