下面列出了android.app.FragmentManager#popBackStack ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private void hideFragment(final Fragment fragment,
final boolean removeParentView,
final boolean addedToBackStack,
final String tag) {
final FragmentManager manager = getFragmentManager();
if (manager.findFragmentByTag(tag) != null) {
final FragmentTransaction transaction = manager.beginTransaction();
transaction.remove(fragment);
transaction.commit();
if (addedToBackStack) {
manager.popBackStack();
}
final int viewId = getParentId(fragment);
if (removeParentView && viewId != 0) {
mContentContainer.removeBorderView(viewId);
}
}
}
public void changeContentFragment(final OpenFragmentCallback callback){
final FragmentManager manager = getFragmentManager();
// confirmContentClose shouldn't be both used as boolean and as close-message,
// this is a bad pattern
if(confirmContentClose != null){
new AlertDialog.Builder(this)
.setMessage(confirmContentClose)
.setCancelable(false)
.setPositiveButton(android.R.string.yes,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
callback.onOpen();
}
})
.setNegativeButton(android.R.string.no, null)
.show();
} else {
manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
callback.onOpen();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
}
return true;
case R.id.menu_item_help:
AboutDialog aboutDialog = new AboutDialog(this);
aboutDialog.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
}
return true;
case ch.haclyon.driveimageview.example.R.id.menu_item_help:
AboutDialog aboutDialog = new AboutDialog(this);
aboutDialog.show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onBackPressed() {
// If the drawer is open, back will close it
if (mDrawerLayout != null && mDrawerLayout.isDrawerOpen(Gravity.START)) {
mDrawerLayout.closeDrawers();
return;
}
// Otherwise, it may return to the previous fragment stack
FragmentManager fragmentManager = getFragmentManager();
if (fragmentManager.getBackStackEntryCount() > 0) {
fragmentManager.popBackStack();
} else {
// Lastly, it will rely on the system behavior for back
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (MenuDoubleTabUtil.shouldIgnoreTap()) {
return false;
}
switch (item.getItemId()) {
case android.R.id.home:
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
try {
fm.popBackStack();
} catch (IllegalStateException e) {
Log.w(Config.LOGTAG, "Unable to pop back stack after pressing home button");
}
return true;
}
break;
case R.id.action_scan_qr_code:
UriHandlerActivity.scan(this);
return true;
}
return super.onOptionsItemSelected(item);
}
private void replaceFragment(@Nullable Fragment fragment, boolean clearBackStack) {
if (fragment == null || isStateSaved) {
return;
}
Fragment currentFragment = getCurrentFragment();
FragmentManager manager = getFragmentManager();
if (clearBackStack) {
manager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
@SuppressLint("CommitTransaction")
FragmentTransaction transaction = manager.beginTransaction()
.replace(R.id.ym_container, fragment);
if (!clearBackStack && currentFragment != null) {
transaction.addToBackStack(fragment.getTag());
}
transaction.commit();
hideKeyboard();
}
@Override
public void onBackPressed() {
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
mCurrentPath = FileUtils.cutLastSegmentOfPath(mCurrentPath);
updateTitle();
} else {
setResult(RESULT_CANCELED);
super.onBackPressed();
}
}
@Override
public void onBackPressed() {
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
mCurrentPath = FileUtils.cutLastSegmentOfPath(mCurrentPath);
updateTitle();
} else {
setResult(RESULT_CANCELED);
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (currentPage) {
case REGISTER_IR_PAGE:
case MANAGE_VIRTUAL_PROFILE_PAGE:
FragmentManager fm = getFragmentManager();
fm.popBackStack();
currentPage--;
break;
default:
finish();
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
} else {
finish();
}
return true;
case R.id.action_settings:
launchSettingsActivity();
return true;
case R.id.action_view_on_github:
launchGitHubPage();
return true;
case R.id.action_help:
launchHelpPage();
return true;
case R.id.action_donate:
launchDonatePage();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (MenuDoubleTabUtil.shouldIgnoreTap()) {
return false;
}
switch (item.getItemId()) {
case android.R.id.home:
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
try {
fm.popBackStack();
} catch (IllegalStateException e) {
Log.w(Config.LOGTAG, "Unable to pop back stack after pressing home button");
}
return true;
}
break;
case R.id.action_scan_qr_code:
UriHandlerActivity.scan(this);
return true;
case R.id.action_check_updates:
if (xmppConnectionService.hasInternetConnection()) {
openInstallFromUnknownSourcesDialogIfNeeded(true);
} else {
ToastCompat.makeText(this, R.string.account_status_no_internet, Toast.LENGTH_LONG).show();
}
break;
case R.id.action_invite_user:
inviteUser();
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
} else {
finish();
}
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed(){
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
Log.i("MainActivity", "popping backstack");
fm.popBackStack();
} else {
Log.i("MainActivity", "nothing on backstack, calling super");
super.onBackPressed();
}
}
/**
* Pops the last item from the back stack.
* If searchView is opened it hides it.
* reAttachMovieFragments re-creates our fragments this is due to a bug in the viewPager
* restoreMovieDetailsState -> when we press back button we would like to restore our previous (if any)
* saved state for the current fragment. We use custom backStack since the original doesn't save fragment's state.
*/
@Override
public void onBackPressed() {
FragmentManager fm = getFragmentManager();
if (mDrawerLayout.isDrawerOpen(mDrawerList))
mDrawerLayout.closeDrawer(mDrawerList);
else {
if (searchViewItem.isActionViewExpanded())
searchViewItem.collapseActionView();
else if (fm.getBackStackEntryCount() > 0) {
String backStackEntry = fm.getBackStackEntryAt(fm.getBackStackEntryCount() - 1).getName();
if (backStackEntry.equals("movieList"))
reAttachMovieFragments = true;
if (backStackEntry.equals("TVList"))
reAttachTVFragments = true;
if (backStackEntry.equals("searchList:1"))
reAttachMovieFragments = true;
if (backStackEntry.equals("searchList:2"))
reAttachTVFragments = true;
restoreMovieDetailsState = true;
restoreMovieDetailsAdapterState = false;
if (orientationChanged)
restoreMovieDetailsAdapterState = true;
fm.popBackStack();
} else {
super.onBackPressed();
}
}
}
public void topFragment(Class<?> cls, int transition, Bundle args) {
Fragment frag = Fragment.instantiate(
this,
cls.getName(),
args
);
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
fragmentManager.beginTransaction()
.replace(R.id.content_frame, frag)
.setTransition(transition)
.commit();
fragmentManager.executePendingTransactions();
configureFragment(frag);
}
public void goBack(BaseActivity activity) {
FragmentManager fm = activity.getFragmentManager();
fm.popBackStack();
}
/**
* 一つ前のFragmentに戻る.
*/
private void back() {
FragmentManager fm = getActivity().getFragmentManager();
fm.popBackStack();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
if (mIsInReplyMode) {
showDiscardReplyDialog();
return true;
}
FragmentManager fm = getFragmentManager();
if (fm.getBackStackEntryCount() > 0) {
fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
} else {
finish();
}
break;
case R.id.action_open_post:
if (mUrl != null) {
if (mChromeCustomTabsHelper != null) {
// build CustomTabs UI
CustomTabsIntent.Builder intentBuilder = new CustomTabsIntent.Builder();
Utils.setupIntentBuilder(intentBuilder, this, prefs);
ChromeCustomTabsHelper.openCustomTab(this, intentBuilder.build(),
Utils.validateAndParseUri(mUrl, mPostId), null);
} else {
Intent urlIntent = new Intent(Intent.ACTION_VIEW);
urlIntent.setData(Utils.validateAndParseUri(mUrl, mPostId));
startActivity(urlIntent);
}
}
break;
case R.id.action_bookmark:
changeBookmarkState();
break;
case R.id.action_upvote:
vote(mPostId, Constants.VOTE_UP);
break;
case R.id.action_reply:
if (!Utils.isOnline(this)) {
Utils.showLongToast(this, R.string.no_connection_prompt);
return false;
}
switchReplyMode(true, mPostId);
break;
case R.id.action_refresh:
CommentsFragment commentFragment =
(CommentsFragment) getFragmentManager().findFragmentByTag(Constants.FRAGMENT_TAG_COMMENT);
commentFragment.getPresenter().refresh();
break;
case R.id.action_share:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
String commentUrl = "https://news.ycombinator.com/item?id=" + mPostId;
sendIntent.putExtra(Intent.EXTRA_TEXT, commentUrl);
sendIntent.setType("text/plain");
startActivity(Intent.createChooser(sendIntent, getString(R.string.share_link_to)));
break;
case R.id.action_typography:
if (!mWindow.isWindowShowing()) {
mWindow.show();
} else {
mWindow.dismiss();
}
break;
}
return super.onOptionsItemSelected(item);
}
protected void changeFragment(Fragment fragment, String name, boolean isChild) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
if (transaction.isAddToBackStackAllowed()) {
int count = fragmentManager.getBackStackEntryCount();
if (count > 0) {
FragmentManager.BackStackEntry entry =
fragmentManager.getBackStackEntryAt(count - 1);
if (entry != null && name.equals(entry.getName())) {
fragmentManager.popBackStack();
if (!isChild) {
// We just removed it's duplicate from the back stack
// And we want at least one in it
transaction.addToBackStack(name);
}
}
}
if (isChild) {
transaction.addToBackStack(name);
}
}
if (getResources().getBoolean(R.bool.hide_bottom_bar_on_second_level_views)) {
if (isChild) {
if (!isTablet()) {
hideTabBar();
}
} else {
showTabBar();
}
}
Compatibility.setFragmentTransactionReorderingAllowed(transaction, false);
if (isChild && isTablet()) {
transaction.replace(R.id.fragmentContainer2, fragment, name);
findViewById(R.id.fragmentContainer2).setVisibility(View.VISIBLE);
} else {
transaction.replace(R.id.fragmentContainer, fragment, name);
}
transaction.commitAllowingStateLoss();
fragmentManager.executePendingTransactions();
}