Java Code Examples for androidx.fragment.app.FragmentManager#getFragments()

public static boolean dispatchBackPressedEvent(FragmentManager fragmentManager) {
    List<Fragment> fragments = fragmentManager.getFragments();

    if (fragments == null)
        return false;

    for (int i = fragments.size() - 1; i >= 0; i--) {
        Fragment fragment = fragments.get(i);

        if (isBackPressedIntercepted(fragment)) {
            ((BackPressedListener) fragment).onBackPressed();
            return true;
        }
    }

    if (fragmentManager.getBackStackEntryCount() > 0) {
        fragmentManager.popBackStack();
        return true;
    }
    return false;
}
 

public static boolean dispatchBackPressedEvent(FragmentManager fragmentManager) {
    List<Fragment> fragments = fragmentManager.getFragments();

    if (fragments == null)
        return false;

    for (int i = fragments.size() - 1; i >= 0; i--) {
        Fragment fragment = fragments.get(i);

        if (isBackPressedIntercepted(fragment)) {
            ((BackPressedListener) fragment).onBackPressed();
            return true;
        }
    }

    if (fragmentManager.getBackStackEntryCount() > 0) {
        fragmentManager.popBackStack();
        return true;
    }
    return false;
}
 

private void showFragment(int index) {
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    List<Fragment> fragments = fragmentManager.getFragments();
    for (int i = 0; i < fragments.size(); i++) {
        fragmentTransaction.hide(fragments.get(i));
    }
    String fragmentName = "";
    if (index == 0) {
        fragmentName = InstallFragment.class.getSimpleName();
    } else if (index == 1) {
        fragmentName = ConsumeFragment.class.getSimpleName();
    } else if (index == 2) {
        fragmentName = ToolsFragment.class.getSimpleName();
    }
    fragmentTransaction.show(Objects.requireNonNull(fragmentManager.findFragmentByTag(fragmentName))).commit();
}
 

@Override
protected void init() {
    editText_profile_name = findViewById(R.id.editText_profile_title);
    operationSelectorFragment = new OperationSelectorFragment();
    operationSelectorFragment.setSelectedListener(this);
    findViewById(R.id.button_add_operation).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            operationSelectorFragment.show(getSupportFragmentManager(), "add_op");
        }
    });

    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction transaction = fragmentManager.beginTransaction();
    for (Fragment fragment : fragmentManager.getFragments()) {
        transaction.remove(fragment);
    }
    transaction.commit();
}
 

/**
 * getFragments()とgetViewPager().getCurrentItem()の紐付けを行う。
 * 表示していたFragmentを返す。
 * @return 表示していたFragment
 */
private Fragment getCurrentFragment(final int current) {
    FragmentManager fm = getSupportFragmentManager();
    Fragment f = null;
    List<Fragment> list = fm.getFragments();

    if (list.size() == 0) {
        return f;
    }

    String className = PAGES[current].getSimpleName();
    for (Fragment fragment : list) {
        if (fragment.getClass().getSimpleName().equals(className)) {
            f = fragment;
        }
    }
    return f;
}
 

private void init() {
    Bundle args = new Bundle();

    long account = getIntent().getLongExtra("account", -1);

    FragmentBase fragment;
    switch (startup) {
        case "accounts":
            fragment = new FragmentAccounts();
            args.putBoolean("settings", false);
            break;
        case "folders":
            fragment = new FragmentFolders();
            args.putLong("account", account);
            break;
        case "primary":
            fragment = new FragmentFolders();
            if (account < 0)
                args.putBoolean("primary", true);
            else
                args.putLong("account", account);
            break;
        default:
            fragment = new FragmentMessages();
    }

    fragment.setArguments(args);

    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fm.beginTransaction();
    for (Fragment existing : fm.getFragments())
        fragmentTransaction.remove(existing);
    fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("unified");
    fragmentTransaction.commit();
}
 

private String getVisibleFragment(Activity activity) {
    if (activity == null) {
        return null;
    }
    StringBuilder builder = new StringBuilder();
    if (activity instanceof AppCompatActivity) {
        AppCompatActivity compatActivity = (AppCompatActivity) activity;
        FragmentManager fragmentManager = compatActivity.getSupportFragmentManager();
        List<Fragment> fragments = fragmentManager.getFragments();
        if (fragments != null && fragments.size() != 0) {
            for (int i = 0; i < fragments.size(); i++) {
                Fragment fragment = fragments.get(i);
                if (fragment != null && fragment.isVisible()) {
                    builder.append(fragment.getClass().getSimpleName() + "#" + fragment.getId());
                    if (i < fragments.size() - 1) {
                        builder.append(";");
                    }
                }
            }
            return builder.toString();
        } else {
            return getFragmentForActivity(activity);
        }
    } else {
        return getFragmentForActivity(activity);
    }
}
 

@Nullable
public static Fragment findDescendantFragment(@NonNull FragmentManager fragmentManager, @NonNull String tag) {
    Fragment target = fragmentManager.findFragmentByTag(tag);
    if (target == null) {
        List<Fragment> fragments = fragmentManager.getFragments();
        int count = fragments.size();
        for (int i = count - 1; i > -1; i--) {
            Fragment f = fragments.get(i);
            if (f.isAdded()) {
                if (f instanceof AwesomeFragment) {
                    AwesomeFragment af = (AwesomeFragment) f;
                    if (af.getSceneId().equals(tag)) {
                        target = af;
                    }
                }

                if (target == null) {
                    target = findDescendantFragment(f.getChildFragmentManager(), tag);
                }

                if (target != null) {
                    break;
                }
            }
        }
    }
    return target;
}
 

@NonNull
public static List<AwesomeFragment> getFragmentsAtAddedList(@NonNull FragmentManager fragmentManager) {
    List<AwesomeFragment> children = new ArrayList<>();
    List<Fragment> fragments = fragmentManager.getFragments();
    for (int i = 0, size = fragments.size(); i < size; i++) {
        Fragment fragment = fragments.get(i);
        if (fragment instanceof AwesomeFragment && fragment.isAdded()) {
            children.add((AwesomeFragment) fragment);
        }
    }
    return children;
}
 

@SuppressLint("RestrictedApi")
public BaseFragment getVisibleFragment()
{
    FragmentManager fragmentManager = MainActivity.this.getSupportFragmentManager();
    List<Fragment> fragments = fragmentManager.getFragments();
    for (Fragment fragment : fragments)
    {
        if (fragment != null && fragment.isVisible() && (fragment instanceof BaseFragment))
        {
            return (BaseFragment) fragment;
        }
    }
    return null;
}
 

/**
 * 检查Fragment或FragmentActivity承载的Fragment是否只有一个
 *
 * @return
 */
protected boolean isSingleFragment() {
    int size = 0;
    FragmentManager manager = getFragmentManager();
    if (manager != null && manager.getFragments() != null) {
        size = manager.getFragments().size();
    }
    LoggerManager.i(TAG, TAG + ";FragmentManager承载Fragment数量:" + size);
    return size <= 1;
}
 

private void hideAllFragmentsInToolPane() {
  FragmentManager fragmentManager = getSupportFragmentManager();
  FragmentTransaction ft = fragmentManager.beginTransaction();
  for (Fragment fragment : fragmentManager.getFragments()) {
    if (!fragment.equals(defaultFragment)) {
      ft.hide(fragment);
    }
  }
  ft.commit();
}
 

@Nullable
static Fragment getVisibleFragment(@NonNull FragmentManager fm) {
    List<Fragment> fragments = fm.getFragments();
    for (Fragment f : fragments) {
        if (f.isVisible()) {
            return f;
        }
    }
    return null;
}
 

/**
 * ViewPager场景下，当前fragment可见时，如果其子fragment也可见，则让子fragment请求数据
 */
private void dispatchParentVisibleState() {
    FragmentManager fragmentManager = getChildFragmentManager();
    List<Fragment> fragments = fragmentManager.getFragments();
    if (fragments.isEmpty()) {
        return;
    }
    for (Fragment child : fragments) {
        if (child instanceof BaseLazyLoadFragment && ((BaseLazyLoadFragment) child).isVisibleToUser) {
            ((BaseLazyLoadFragment) child).tryLoadData();
        }
    }
}
 

/**
 * Fragment の {@link BaseFragment#onReturn()} を呼び出します.
 */
private void callFragment() {
    FragmentManager manager = getSupportFragmentManager();
    List<Fragment> fragments = manager.getFragments();
    for (Fragment fragment : fragments) {
        if (fragment instanceof BaseFragment) {
            ((BaseFragment) fragment).onReturn();
        }
    }
}
 

private void onModelSelected(final ThetaDeviceModel model) {
    FragmentManager fragmentMgr = getSupportFragmentManager();
    List<Fragment> list = fragmentMgr.getFragments();
    if (list != null) {
        for (Fragment f : list) {
            if (f instanceof SettingsFragment) {
                ((SettingsFragment) f).onModelSelected(model);
            }
        }
    }
}