本文整理了Java中androidx.fragment.app.FragmentManager类的一些代码示例，展示了FragmentManager类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。FragmentManager类的具体详情如下：
包路径：androidx.fragment.app.FragmentManager
类名称：FragmentManager

FragmentManager介绍

暂无

代码示例

代码示例来源：origin: ankidroid/Anki-Android

private void loadStudyOptionsFragment() {
  boolean withDeckOptions = false;
  if (getIntent().getExtras() != null) {
    withDeckOptions = getIntent().getExtras().getBoolean("withDeckOptions");
  }
  StudyOptionsFragment currentFragment = StudyOptionsFragment.newInstance(withDeckOptions);
  getSupportFragmentManager().beginTransaction().replace(R.id.studyoptions_frame, currentFragment).commit();
}

代码示例来源：origin: ankidroid/Anki-Android

/**
 * Global method to show dialog fragment including adding it to back stack Note: DO NOT call this from an async
 * task! If you need to show a dialog from an async task, use showAsyncDialogFragment()
 *
 * @param newFragment  the DialogFragment you want to show
 */
public void showDialogFragment(DialogFragment newFragment) {
  // 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 = getSupportFragmentManager().beginTransaction();
  Fragment prev = getSupportFragmentManager().findFragmentByTag("dialog");
  if (prev != null) {
    ft.remove(prev);
  }
  // save transaction to the back stack
  ft.addToBackStack("dialog");
  newFragment.show(ft, "dialog");
  getSupportFragmentManager().executePendingTransactions();
}

代码示例来源：origin: robolectric/robolectric

@Test
 public void recreate_nonRetainFragmentHostingActivity() {
  Fragment fragment = new Fragment();
  fragment.setRetainInstance(false);
  ActivityScenario<LifecycleOwnerActivity> activityScenario =
    ActivityScenario.launch(LifecycleOwnerActivity.class);
  assertThat(activityScenario).isNotNull();
  activityScenario.onActivity(
    activity -> {
     activity
       .getSupportFragmentManager()
       .beginTransaction()
       .add(android.R.id.content, fragment)
       .commitNow();
     assertThat(activity.getSupportFragmentManager().findFragmentById(android.R.id.content))
       .isSameAs(fragment);
    });
  activityScenario.recreate();
  activityScenario.onActivity(
    activity ->
      assertThat(activity.getSupportFragmentManager().findFragmentById(android.R.id.content))
        .isNotSameAs(fragment));
 }
}

代码示例来源：origin: proninyaroslav/libretorrent

public static HeavyInstanceStorage getInstance(FragmentManager fragmentManager)
  {
    if (fragmentManager == null)
      return null;

    HeavyInstanceStorage out = (HeavyInstanceStorage)fragmentManager.findFragmentByTag(TAG);

    if (out == null) {
      out = new HeavyInstanceStorage();
      fragmentManager.beginTransaction().add(out, TAG).commitAllowingStateLoss();
    }

    return out;
  }
}

代码示例来源：origin: googlesamples/easypermissions

@Override
  public void showRequestPermissionRationale(@NonNull String rationale,
                        @NonNull String positiveButton,
                        @NonNull String negativeButton,
                        @StyleRes int theme,
                        int requestCode,
                        @NonNull String... perms) {

    FragmentManager fm = getSupportFragmentManager();

    // Check if fragment is already showing
    Fragment fragment = fm.findFragmentByTag(RationaleDialogFragmentCompat.TAG);
    if (fragment instanceof RationaleDialogFragmentCompat) {
      Log.d(TAG, "Found existing fragment, not showing rationale.");
      return;
    }

    RationaleDialogFragmentCompat
        .newInstance(rationale, positiveButton, negativeButton, theme, requestCode, perms)
        .showAllowingStateLoss(fm, RationaleDialogFragmentCompat.TAG);
  }
}

代码示例来源：origin: ankidroid/Anki-Android

public StudyOptionsFragment getFragment() {
  Fragment frag = getSupportFragmentManager().findFragmentById(R.id.studyoptions_fragment);
  if ((frag instanceof StudyOptionsFragment)) {
    return (StudyOptionsFragment) frag;
  }
  return null;
}

代码示例来源：origin: westnordost/StreetComplete

@Override public void onComposeNote(long questId, QuestGroup group, String questTitle)
{
  LeaveNoteInsteadFragment f = new LeaveNoteInsteadFragment();
  Bundle args = QuestAnswerComponent.Companion.createArguments(questId, group);
  args.putString(LeaveNoteInsteadFragment.ARG_QUEST_TITLE, questTitle);
  f.setArguments(args);
  getSupportFragmentManager().popBackStack(BOTTOM_SHEET, FragmentManager.POP_BACK_STACK_INCLUSIVE);
  FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
  ft.setCustomAnimations(
    0, R.animator.quest_answer_form_disappear,
    0, R.animator.quest_answer_form_disappear);
  ft.add(R.id.map_bottom_sheet_container, f, BOTTOM_SHEET);
  ft.addToBackStack(BOTTOM_SHEET);
  ft.commit();
}

代码示例来源：origin: jruesga/rview

@Override
protected void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  //Save the fragment's instance
  Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG);
  if (fragment != null) {
    getSupportFragmentManager().putFragment(outState, FRAGMENT_TAG, fragment);
  }
}

代码示例来源：origin: westnordost/StreetComplete

@Override public void onBackPressed() {
  if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
    getSupportFragmentManager().popBackStack();
  } else {
    super.onBackPressed();
  }
}

代码示例来源：origin: WireGuard/wireguard-android

@Override public void onBackStackChanged() {
  if (actionBar == null)
    return;
  // Do not show the home menu when the two-pane layout is at the detail view (see above).
  final int backStackEntries = getSupportFragmentManager().getBackStackEntryCount();
  final int minBackStackEntries = isTwoPaneLayout ? 2 : 1;
  actionBar.setDisplayHomeAsUpEnabled(backStackEntries >= minBackStackEntries);
}

代码示例来源：origin: michael-rapp/AndroidMaterialPreferences

@Override
protected final void onCreate(final Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG);
  if (fragment == null) {
    fragment = Fragment.instantiate(this, PreferenceFragment.class.getName());
  }
  FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
  transaction.replace(R.id.fragment, fragment);
  transaction.commit();
}

代码示例来源：origin: wdullaer/MaterialDateTimePicker

@Override
public void onResume() {
  super.onResume();
  DatePickerDialog dpd = (DatePickerDialog) requireFragmentManager().findFragmentByTag("Datepickerdialog");
  if(dpd != null) dpd.setOnDateSetListener(this);
}

代码示例来源：origin: ankidroid/Anki-Android

private StudyOptionsFragment getCurrentFragment() {
  return (StudyOptionsFragment) getSupportFragmentManager().findFragmentById(R.id.studyoptions_frame);
}

代码示例来源：origin: jruesga/rview

@Override
protected void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  //Save the fragment's instance
  Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG);
  if (fragment != null) {
    getSupportFragmentManager().putFragment(outState, FRAGMENT_TAG, fragment);
  }
}

代码示例来源：origin: KDE/kdeconnect-android

@Override
public boolean onOptionsItemSelected(MenuItem item) {
  if (item.getItemId() == android.R.id.home) {
    FragmentManager fm = getSupportFragmentManager();
    if (fm.getBackStackEntryCount() > 0) {
      fm.popBackStack();
      return true;
    }
  }
  return super.onOptionsItemSelected(item);
}

代码示例来源：origin: square/picasso

void showDetails(String url) {
 getSupportFragmentManager().beginTransaction()
   .replace(R.id.sample_content, DetailFragment.newInstance(url))
   .addToBackStack(null)
   .commit();
}

代码示例来源：origin: robolectric/robolectric

@Test
public void recreate_retainFragmentHostingActivity() {
 Fragment fragment = new Fragment();
 fragment.setRetainInstance(true);
 ActivityScenario<LifecycleOwnerActivity> activityScenario =
   ActivityScenario.launch(LifecycleOwnerActivity.class);
 assertThat(activityScenario).isNotNull();
 activityScenario.onActivity(
   activity -> {
    activity
      .getSupportFragmentManager()
      .beginTransaction()
      .add(android.R.id.content, fragment)
      .commitNow();
    assertThat(activity.getSupportFragmentManager().findFragmentById(android.R.id.content))
      .isSameAs(fragment);
   });
 activityScenario.recreate();
 activityScenario.onActivity(
   activity ->
     assertThat(activity.getSupportFragmentManager().findFragmentById(android.R.id.content))
       .isSameAs(fragment));
}

代码示例来源：origin: andstatus/andstatus

public void show(FragmentActivity fragmentActivity) {
  FragmentTransaction ft = fragmentActivity.getSupportFragmentManager().beginTransaction();
  Fragment prev = fragmentActivity.getSupportFragmentManager().findFragmentByTag(dialogTag);
  if (prev != null) {
    ft.remove(prev);
  }
  ft.addToBackStack(null);
  show(ft, dialogTag);
}

代码示例来源：origin: wdullaer/MaterialDateTimePicker

@Override
public void onResume() {
  super.onResume();
  TimePickerDialog tpd = (TimePickerDialog) requireFragmentManager().findFragmentByTag("Timepickerdialog");
  if(tpd != null) tpd.setOnTimeSetListener(this);
}

代码示例来源：origin: guardianproject/haven

private void switchCamera() {
  String camera = mPrefManager.getCamera();
  if (camera.equals(PreferenceManager.FRONT))
    mPrefManager.setCamera(PreferenceManager.BACK);
  else if (camera.equals(PreferenceManager.BACK))
    mPrefManager.setCamera(PreferenceManager.FRONT);
  ((CameraFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_camera)).updateCamera();
  setResult(RESULT_OK);
}