下面列出了android.support.v4.app.Fragment#isRemoving ( ) 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。
@Nullable
@Override
public Animation onCreateAnimation(final int transit, final boolean enter, final int nextAnim) {
final Fragment parent = getParentFragment();
// Apply the workaround only if this is a child fragment, and the parent
// is being removed.
if (!enter && parent != null && parent.isRemoving()) {
// This is a workaround for the bug where child fragments disappear when
// the parent is removed (as all children are first removed from the parent)
// See https://code.google.com/p/android/issues/detail?id=55228
final Animation doNothingAnim = new AlphaAnimation(1, 1);
doNothingAnim.setStartOffset(getResources().getInteger(R.integer.cf_anim_duration));
doNothingAnim.setDuration(getResources().getInteger(R.integer.cf_anim_duration));
return doNothingAnim;
} else {
return super.onCreateAnimation(transit, enter, nextAnim);
}
}
/**
* Use in case this Presenter is associated with an {@link Fragment}
* Call from {@link Fragment#onDestroy()}
*
* @param fragment Any instance of type {@link Fragment}
*/
public void onDestroy(@NonNull Fragment fragment)
{
if(this.mPresenter == null) return;
if(fragment.getActivity().isFinishing())
{
removePresenter();
}
else if(fragment.isRemoving() && !this.mOnSaveInstanceCalled)
{
// The fragment can be still in backstack even if isRemoving() is true.
// We check mOnSaveInstanceCalled - if this was not called then the fragment is totally removed.
Log.d(LOG_TAG, "Removing presenter - fragment replaced");
removePresenter();
}
this.mAlreadyCreated = false;
}
static boolean retainPresenterInstance(Activity activity, Fragment fragment,
boolean keepPresenterInstanceDuringScreenOrientationChanges,
boolean keepPresenterOnBackstack) {
if (activity.isChangingConfigurations()) {
return keepPresenterInstanceDuringScreenOrientationChanges;
}
if (activity.isFinishing()) {
return false;
}
if (keepPresenterOnBackstack && BackstackAccessor.isFragmentOnBackStack(fragment)) {
return true;
}
return !fragment.isRemoving();
}
private boolean retainPresenterInstance(boolean keepPresenterOnBackstack, Activity activity,
Fragment fragment) {
if (activity.isChangingConfigurations()) {
if (keepPresenterDuringScreenOrientationChange) {
return true;
}
return false;
}
if (activity.isFinishing()) {
return false;
}
if (keepPresenterOnBackstack && BackstackAccessor.isFragmentOnBackStack(fragment)) {
return true;
}
return !fragment.isRemoving();
}
@Override
public Animation onCreateAnimation(int transit, boolean enter, int nextAnim) {
final Fragment parent = getParentFragment();
// Apply the workaround only if this is a child fragment, and the parent
// is being removed.
if (!enter && parent != null && parent.isRemoving()) {
// This is a workaround for the bug where child fragments disappear when
// the parent is removed (as all children are first removed from the parent)
// See https://code.google.com/p/android/issues/detail?id=55228
Animation doNothingAnim = new AlphaAnimation(1, 1);
doNothingAnim.setDuration(getNextAnimationDuration(parent));
return doNothingAnim;
} else {
return super.onCreateAnimation(transit, enter, nextAnim);
}
}
@Override
public void onDestroy() {
super.onDestroy();
//We leave the screen and respectively all fragments will be destroyed
if (getActivity().isFinishing()) {
getMvpDelegate().onDestroy();
return;
}
// When we rotate device isRemoving() return true for fragment placed in backstack
// http://stackoverflow.com/questions/34649126/fragment-back-stack-and-isremoving
if (mIsStateSaved) {
mIsStateSaved = false;
return;
}
// See https://github.com/Arello-Mobile/Moxy/issues/24
boolean anyParentIsRemoving = false;
Fragment parent = getParentFragment();
while (!anyParentIsRemoving && parent != null) {
anyParentIsRemoving = parent.isRemoving();
parent = parent.getParentFragment();
}
if (isRemoving() || anyParentIsRemoving) {
getMvpDelegate().onDestroy();
}
}
@Override
public void onDestroy() {
super.onDestroy();
//We leave the screen and respectively all fragments will be destroyed
if (getActivity().isFinishing()) {
getMvpDelegate().onDestroy();
return;
}
// When we rotate device isRemoving() return true for fragment placed in backstack
// http://stackoverflow.com/questions/34649126/fragment-back-stack-and-isremoving
if (mIsStateSaved) {
mIsStateSaved = false;
return;
}
// See https://github.com/Arello-Mobile/Moxy/issues/24
boolean anyParentIsRemoving = false;
Fragment parent = getParentFragment();
while (!anyParentIsRemoving && parent != null) {
anyParentIsRemoving = parent.isRemoving();
parent = parent.getParentFragment();
}
if (isRemoving() || anyParentIsRemoving) {
getMvpDelegate().onDestroy();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Forward onActivityResult to child Fragment
Fragment fragment = getSupportFragmentManager().findFragmentByTag(FRAGMENT_TAG);
if (fragment != null && !fragment.isRemoving()) {
fragment.onActivityResult(requestCode, resultCode, data);
}
}
@Override
protected Fragment checkAvailability() {
Fragment fragment = mReference.get();
if (fragment == null || fragment.isRemoving() || fragment.getActivity() == null || fragment.getActivity().isFinishing()) {
return null;
} else {
return fragment;
}
}
public Fragment getRemovingParentFragment() {
Fragment parentFragment = this.getParentFragment();
while (parentFragment != null && !parentFragment.isRemoving()) {
parentFragment = parentFragment.getParentFragment();
}
return parentFragment;
}
/**
* 操作fragment
*
* @param fragmentManager fragment管理器
* @param srcFragment 源fragment
* @param destFragment 目标fragment
* @param type 操作类型
* @param sharedElements 共享元素
* @return destFragment
*/
private static Fragment operateFragment(@NonNull final FragmentManager fragmentManager,
final Fragment srcFragment,
@NonNull Fragment destFragment,
final int type,
final SharedElement... sharedElements) {
if (srcFragment == destFragment) return null;
if (srcFragment != null && srcFragment.isRemoving()) {
//LogUtils.e(srcFragment.getClass().getName() + " is isRemoving");
return null;
}
String name = destFragment.getClass().getName();
Bundle args = destFragment.getArguments();
FragmentTransaction ft = fragmentManager.beginTransaction();
if (sharedElements == null || sharedElements.length == 0) {
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
} else {
for (SharedElement element : sharedElements) {// 添加共享元素动画
ft.addSharedElement(element.sharedElement, element.name);
}
}
switch (type) {
case TYPE_HIDE_ADD_FRAGMENT:
ft.hide(srcFragment);
case TYPE_ADD_FRAGMENT:
Fragment fragmentByTag = fragmentManager.findFragmentByTag(name);
if (fragmentByTag != null) {
destFragment = fragmentByTag;
}
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_HIDE)) ft.hide(destFragment);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_REMOVE_FRAGMENT:
ft.remove(destFragment);
break;
case TYPE_REMOVE_TO_FRAGMENT:
List<Fragment> fragments = getFragments(fragmentManager);
for (int i = fragments.size() - 1; i >= 0; --i) {
Fragment fragment = fragments.get(i);
if (fragment == destFragment) {
if (srcFragment != null) ft.remove(fragment);
break;
}
ft.remove(fragment);
}
break;
case TYPE_REPLACE_FRAGMENT:
ft.replace(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_POP_ADD_FRAGMENT:
popFragment(fragmentManager);
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_HIDE_FRAGMENT:
ft.hide(destFragment);
break;
case TYPE_SHOW_FRAGMENT:
ft.show(destFragment);
break;
case TYPE_HIDE_SHOW_FRAGMENT:
ft.hide(srcFragment).show(destFragment);
break;
}
ft.commitAllowingStateLoss();
return destFragment;
}
/**
* 操作fragment
*
* @param fragmentManager fragment管理器
* @param srcFragment 源fragment
* @param destFragment 目标fragment
* @param type 操作类型
* @param sharedElements 共享元素
* @return destFragment
*/
private static Fragment operateFragment(@NonNull FragmentManager fragmentManager,
Fragment srcFragment,
@NonNull Fragment destFragment,
int type,
SharedElement... sharedElements) {
if (srcFragment == destFragment)
return null;
if (srcFragment != null && srcFragment.isRemoving()) {
// Log.e(srcFragment.getClass().getSimpleName() + " is isRemoving");
return null;
}
String name = destFragment.getClass().getSimpleName();
Bundle args = destFragment.getArguments();
FragmentTransaction ft = fragmentManager.beginTransaction();
if (sharedElements == null || sharedElements.length == 0) {
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
} else {
for (SharedElement element : sharedElements) {// 添加共享元素动画
ft.addSharedElement(element.sharedElement, element.name);
}
}
switch (type) {
case TYPE_ADD_FRAGMENT:
if (srcFragment != null)
ft.hide(srcFragment);
if (destFragment.isAdded())
break;
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_HIDE))
ft.hide(destFragment);
if (args.getBoolean(ARGS_IS_ADD_STACK))
ft.addToBackStack(name);
break;
case TYPE_REMOVE_FRAGMENT:
ft.remove(destFragment);
break;
case TYPE_REMOVE_TO_FRAGMENT:
List<Fragment> fragments = getFragments(fragmentManager);
for (int i = fragments.size() - 1; i >= 0; --i) {
Fragment fragment = fragments.get(i);
if (fragment == destFragment) {
if (srcFragment != null)
ft.remove(fragment);
break;
}
ft.remove(fragment);
}
break;
case TYPE_REPLACE_FRAGMENT:
ft.replace(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK))
ft.addToBackStack(name);
break;
case TYPE_POP_ADD_FRAGMENT:
popFragment(fragmentManager);
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK))
ft.addToBackStack(name);
break;
case TYPE_HIDE_FRAGMENT:
ft.hide(destFragment);
break;
case TYPE_SHOW_FRAGMENT:
ft.show(destFragment);
break;
case TYPE_HIDE_SHOW_FRAGMENT:
ft.hide(srcFragment).show(destFragment);
break;
}
ft.commitAllowingStateLoss();
return destFragment;
}
/**
* 操作fragment
*
* @param fragmentManager fragment管理器
* @param srcFragment 源fragment
* @param destFragment 目标fragment
* @param type 操作类型
* @param sharedElements 共享元素
* @return destFragment
*/
private static Fragment operateFragment(@NonNull FragmentManager fragmentManager,
Fragment srcFragment,
@NonNull Fragment destFragment,
int type,
SharedElement... sharedElements) {
if (srcFragment == destFragment) return null;
if (srcFragment != null && srcFragment.isRemoving()) {
LogUtils.e(srcFragment.getClass().getName() + " is isRemoving");
return null;
}
String name = destFragment.getClass().getName();
Bundle args = destFragment.getArguments();
FragmentTransaction ft = fragmentManager.beginTransaction();
if (sharedElements == null || sharedElements.length == 0) {
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
} else {
for (SharedElement element : sharedElements) {// 添加共享元素动画
ft.addSharedElement(element.sharedElement, element.name);
}
}
switch (type) {
case TYPE_ADD_FRAGMENT:
if (srcFragment != null) ft.hide(srcFragment);
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_HIDE)) ft.hide(destFragment);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_REMOVE_FRAGMENT:
ft.remove(destFragment);
break;
case TYPE_REMOVE_TO_FRAGMENT:
List<Fragment> fragments = getFragments(fragmentManager);
for (int i = fragments.size() - 1; i >= 0; --i) {
Fragment fragment = fragments.get(i);
if (fragment == destFragment) {
if (srcFragment != null) ft.remove(fragment);
break;
}
ft.remove(fragment);
}
break;
case TYPE_REPLACE_FRAGMENT:
ft.replace(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_POP_ADD_FRAGMENT:
popFragment(fragmentManager);
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) ft.addToBackStack(name);
break;
case TYPE_HIDE_FRAGMENT:
ft.hide(destFragment);
break;
case TYPE_SHOW_FRAGMENT:
ft.show(destFragment);
break;
case TYPE_HIDE_SHOW_FRAGMENT:
ft.hide(srcFragment).show(destFragment);
break;
}
ft.commitAllowingStateLoss();
return destFragment;
}
/**
* 操作fragment
*
* @param fragmentManager fragment管理器
* @param srcFragment 源fragment
* @param destFragment 目标fragment
* @param type 操作类型
* @param sharedElements 共享元素
* @return destFragment
*/
private static Fragment operateFragment(@NonNull FragmentManager fragmentManager,
Fragment srcFragment,
@NonNull Fragment destFragment,
int type,
SharedElement... sharedElements) {
if (srcFragment == destFragment) {
return null;
}
if (srcFragment != null && srcFragment.isRemoving()) {
Timber.e(srcFragment.getClass().getSimpleName() + " is isRemoving");
return null;
}
String name = destFragment.getClass().getSimpleName();
Bundle args = destFragment.getArguments();
FragmentTransaction ft = fragmentManager.beginTransaction();
if (sharedElements == null || sharedElements.length == 0) {
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
} else {
// 添加共享元素动画
for (SharedElement element : sharedElements) {
ft.addSharedElement(element.sharedElement, element.name);
}
}
switch (type) {
case TYPE_ADD_FRAGMENT:
if (srcFragment != null) {
ft.hide(srcFragment);
}
if (destFragment.isAdded()) {
break;
}
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_HIDE)) {
ft.hide(destFragment);
}
if (args.getBoolean(ARGS_IS_ADD_STACK)) {
ft.addToBackStack(name);
}
break;
case TYPE_REMOVE_FRAGMENT:
ft.remove(destFragment);
break;
case TYPE_REMOVE_TO_FRAGMENT:
List<Fragment> fragments = getFragments(fragmentManager);
for (int i = fragments.size() - 1; i >= 0; --i) {
Fragment fragment = fragments.get(i);
if (fragment == destFragment) {
if (srcFragment != null) {
ft.remove(fragment);
}
break;
}
ft.remove(fragment);
}
break;
case TYPE_REPLACE_FRAGMENT:
ft.replace(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) {
ft.addToBackStack(name);
}
break;
case TYPE_POP_ADD_FRAGMENT:
popFragment(fragmentManager);
ft.add(args.getInt(ARGS_ID), destFragment, name);
if (args.getBoolean(ARGS_IS_ADD_STACK)) {
ft.addToBackStack(name);
}
break;
case TYPE_HIDE_FRAGMENT:
ft.hide(destFragment);
break;
case TYPE_SHOW_FRAGMENT:
ft.show(destFragment);
break;
case TYPE_HIDE_SHOW_FRAGMENT:
ft.hide(srcFragment).show(destFragment);
break;
default:
break;
}
ft.commitAllowingStateLoss();
return destFragment;
}