嵌套的片段与backstack简历 [英] Nested Fragment with backstack Resume
本文介绍了嵌套的片段与backstack简历的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的应用程序有几个片段 S IN的活动和我保持了 backStack 这些片段。一切都是好的，但其中的一个嵌套的片段。当我把它变成 backStack 键，再由pressing后退按钮恢复中，片段看起来overllaping previous内容（子片段）。
这是正常的观点：
这是重叠视图的截图（当我恢复片段）：
您可以得到不同的是，第二个文本是比较深的（这意味着子片段重叠）
我怎样才能避免这种情况？这在code为我的嵌套的片段：
公共类CompetitiveProgramming扩展SherlockProgressFragment工具
OnChapterSelectListener，OnSubChapterSelectListener { 查看mContentView;
静态公开名单＆LT;＆章GT; chapterList =新的ArrayList＆LT;＆章GT;（）;
私人ProcessTask processTask = NULL; @覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
this.setRetainInstance（真）;
} @覆盖
公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
捆绑savedInstanceState）{
mContentView = inflater.inflate（
R.layout.competitive_programming_exercise，集装箱，FALSE）;
返回super.onCreateView（充气器，容器，savedInstanceState）;
} @覆盖
公共无效onActivityCreated（捆绑savedInstanceState）{
super.onActivityCreated（savedInstanceState）;
setContentShown（假）;
的setContentView（mContentView）;
processTask =新ProcessTask（）;
processTask.execute（）;
}
保护类ProcessTask扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; { @覆盖
保护无效doInBackground（虚空...... PARAMS）{
//后台任务
返回null;
} @覆盖
保护无效onPostExecute（虚空结果）{
super.onPostExecute（结果）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
如果（mContentView.findViewById（R.id.fragment_container）！= NULL）{
getChildFragmentManager（）调用BeginTransaction（）
。新增（R.id.fragment_container，新ChaptersListFragment（））提交（）。
}其他{
transaction.add（R.id.category_fragment，新ChaptersListFragment（））;
transaction.add（R.id.sub_category_fragment，新SubChaptersListFragment（））;
transaction.add（R.id.sub_sub_category_fragment，
新SubSubChaptersListFragment（））;
}
器transaction.commit（）;
setContentShown（真）;
} } 静态保护类{章
串CHAPTERTITLE;
清单＆LT;＆子章GT; subchapterList; 市民章（字符串CHAPTERTITLE，列表与LT;小节＆GT; subchapterList）{
this.chapterTitle = CHAPTERTITLE;
this.subchapterList = subchapterList;
} } @覆盖
公共无效onChapterSelected（INT位置）{
SubChaptersListFragment subChaptersListFrag =（SubChaptersListFragment）getChildFragmentManager（）
.findFragmentById（R.id.sub_category_fragment）;
如果（subChaptersListFrag！= NULL）{
subChaptersListFrag.updateList（位置）;
}其他{
SubChaptersListFragment subChapterFragment =新SubChaptersListFragment（）;
捆绑ARGS =新包（）;
args.putInt（SubChaptersListFragment.CHAPTER_POSITION，位置）;
subChapterFragment.setArguments（参数）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
transaction.replace（R.id.fragment_container，subChapterFragment）;
// transaction.addToBackStack（NULL）;
器transaction.commit（）;
}
} @覆盖
公共无效onSubChapterSelected（INT preV，INT位置）{
SubSubChaptersListFragment subSubChaptersListFrag =（SubSubChaptersListFragment）getChildFragmentManager（）
.findFragmentById（R.id.sub_sub_category_fragment）;
如果（subSubChaptersListFrag！= NULL）{
subSubChaptersListFrag.updateList（preV，位置）;
}其他{
SubSubChaptersListFragment subSubChapterFragment =新SubSubChaptersListFragment（）;
捆绑ARGS =新包（）;
args.putIntArray（SubSubChaptersListFragment.POSITIONS，新的INT [] {preV，位置}）;
subSubChapterFragment.setArguments（参数）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
transaction.replace（R.id.fragment_container，subSubChapterFragment）;
// transaction.addToBackStack（NULL）;
器transaction.commit（）;
}
} @覆盖
公共无效的onStop（）{
super.onStop（）;
如果（processTask = NULL＆放大器;！＆安培;！processTask.getStatus（）= AsyncTask.Status.FINISHED）{
processTask.cancel（真）;
}
}}
解决方案
基里尔库拉科夫是正确的。 替换而不是添加应使用。我编辑了code：
公共类CompetitiveProgramming扩展SherlockProgressFragment工具
OnChapterSelectListener，OnSubChapterSelectListener { 查看mContentView;
静态公开名单＆LT;＆章GT; chapterList =新的ArrayList＆LT;＆章GT;（）;
私人ProcessTask processTask = NULL;
片段chapterFragment = NULL;
片段subChapterFragment = NULL;
片段subSubChapterFragment = NULL; @覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
this.setRetainInstance（真）;
} @覆盖
公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
捆绑savedInstanceState）{
mContentView = inflater.inflate（
R.layout.competitive_programming_exercise，集装箱，FALSE）;
返回super.onCreateView（充气器，容器，savedInstanceState）;
} @覆盖
公共无效onActivityCreated（捆绑savedInstanceState）{
super.onActivityCreated（savedInstanceState）;
setContentShown（假）;
的setContentView（mContentView）;
processTask =新ProcessTask（）;
processTask.execute（）;
}
保护类ProcessTask扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT; { @覆盖
保护无效doInBackground（虚空...... PARAMS）{
//后台任务
返回null;
} @覆盖
保护无效onPostExecute（虚空结果）{
super.onPostExecute（结果）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
chapterFragment =新ChaptersListFragment（）;
如果（mContentView.findViewById（R.id.fragment_container）！= NULL）{
transaction.replace（R.id.fragment_container，chapterFragment）;
}其他{
subChapterFragment =新SubChaptersListFragment（）;
subSubChapterFragment =新SubSubChaptersListFragment（）;
transaction.replace（R.id.category_fragment，chapterFragment）;
transaction.replace（R.id.sub_category_fragment，subChapterFragment）;
transaction.replace（R.id.sub_sub_category_fragment，subSubChapterFragment）;
}
器transaction.commit（）;
setContentShown（真）;
} } 静态保护类{章
串CHAPTERTITLE;
清单＆LT;＆子章GT; subchapterList; 市民章（字符串CHAPTERTITLE，列表与LT;小节＆GT; subchapterList）{
this.chapterTitle = CHAPTERTITLE;
this.subchapterList = subchapterList;
} } @覆盖
公共无效onChapterSelected（INT位置）{
SubChaptersListFragment subChaptersListFrag =（SubChaptersListFragment）getChildFragmentManager（）
.findFragmentById（R.id.sub_category_fragment）;
如果（subChaptersListFrag！= NULL）{
subChaptersListFrag.updateList（位置）;
}其他{
SubChaptersListFragment subChapterFragment =新SubChaptersListFragment（）;
捆绑ARGS =新包（）;
args.putInt（SubChaptersListFragment.CHAPTER_POSITION，位置）;
subChapterFragment.setArguments（参数）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
transaction.replace（R.id.fragment_container，subChapterFragment）;
// transaction.addToBackStack（NULL）;
器transaction.commit（）;
}
} @覆盖
公共无效onSubChapterSelected（INT preV，INT位置）{
SubSubChaptersListFragment subSubChaptersListFrag =（SubSubChaptersListFragment）getChildFragmentManager（）
.findFragmentById（R.id.sub_sub_category_fragment）;
如果（subSubChaptersListFrag！= NULL）{
subSubChaptersListFrag.updateList（preV，位置）;
}其他{
SubSubChaptersListFragment subSubChapterFragment =新SubSubChaptersListFragment（）;
捆绑ARGS =新包（）;
args.putIntArray（SubSubChaptersListFragment.POSITIONS，新的INT [] {preV，位置}）;
subSubChapterFragment.setArguments（参数）;
FragmentTransaction交易= getChildFragmentManager（）
.beginTransaction（）;
transaction.replace（R.id.fragment_container，subSubChapterFragment）;
// transaction.addToBackStack（NULL）;
器transaction.commit（）;
}
} @覆盖
公共无效的onStop（）{
super.onStop（）;
如果（processTask = NULL＆放大器;！＆安培;！processTask.getStatus（）= AsyncTask.Status.FINISHED）{
processTask.cancel（真）;
}
}}
希望这将有助于！
In my application there are several fragments in an activity and I am maintaining a backStack for these fragment. Everything is okay, but there is a nested fragment among them. When I put it into backStack and again resume in by pressing back button, the fragment looks overllaping previous content (child fragment).
This is the normal view:
This is the screenshot of overlapping view (when I resume the fragment):
You can get the difference as the second one's text is more deep (that means child fragment is overlapping)
How can I avoid that? This the code for my nested fragment:
public class CompetitiveProgramming extends SherlockProgressFragment implements
OnChapterSelectListener, OnSubChapterSelectListener {
View mContentView;
static public List<Chapter> chapterList = new ArrayList<Chapter>();
private ProcessTask processTask = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mContentView = inflater.inflate(
R.layout.competitive_programming_exercise, container, false);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setContentShown(false);
setContentView(mContentView);
processTask = new ProcessTask();
processTask.execute();
}
protected class ProcessTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
// background task
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
if (mContentView.findViewById(R.id.fragment_container) != null) {
getChildFragmentManager().beginTransaction()
.add(R.id.fragment_container, new ChaptersListFragment()).commit();
} else {
transaction.add(R.id.category_fragment, new ChaptersListFragment());
transaction.add(R.id.sub_category_fragment, new SubChaptersListFragment());
transaction.add(R.id.sub_sub_category_fragment,
new SubSubChaptersListFragment());
}
transaction.commit();
setContentShown(true);
}
}
static protected class Chapter {
String chapterTitle;
List<SubChapter> subchapterList;
public Chapter(String chapterTitle, List<SubChapter> subchapterList) {
this.chapterTitle = chapterTitle;
this.subchapterList = subchapterList;
}
}
@Override
public void onChapterSelected(int position) {
SubChaptersListFragment subChaptersListFrag = (SubChaptersListFragment) getChildFragmentManager()
.findFragmentById(R.id.sub_category_fragment);
if (subChaptersListFrag != null) {
subChaptersListFrag.updateList(position);
} else {
SubChaptersListFragment subChapterFragment = new SubChaptersListFragment();
Bundle args = new Bundle();
args.putInt(SubChaptersListFragment.CHAPTER_POSITION, position);
subChapterFragment.setArguments(args);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
transaction.replace(R.id.fragment_container, subChapterFragment);
// transaction.addToBackStack(null);
transaction.commit();
}
}
@Override
public void onSubChapterSelected(int prev, int position) {
SubSubChaptersListFragment subSubChaptersListFrag = (SubSubChaptersListFragment) getChildFragmentManager()
.findFragmentById(R.id.sub_sub_category_fragment);
if (subSubChaptersListFrag != null) {
subSubChaptersListFrag.updateList(prev, position);
} else {
SubSubChaptersListFragment subSubChapterFragment = new SubSubChaptersListFragment();
Bundle args = new Bundle();
args.putIntArray(SubSubChaptersListFragment.POSITIONS, new int[]{prev, position});
subSubChapterFragment.setArguments(args);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
transaction.replace(R.id.fragment_container, subSubChapterFragment);
// transaction.addToBackStack(null);
transaction.commit();
}
}
@Override
public void onStop() {
super.onStop();
if (processTask != null && processTask.getStatus() != AsyncTask.Status.FINISHED) {
processTask.cancel(true);
}
}
}
解决方案
Kirill Kulakov is right. replace instead of add should be used. I edited the code:
public class CompetitiveProgramming extends SherlockProgressFragment implements
OnChapterSelectListener, OnSubChapterSelectListener {
View mContentView;
static public List<Chapter> chapterList = new ArrayList<Chapter>();
private ProcessTask processTask = null;
Fragment chapterFragment = null;
Fragment subChapterFragment = null;
Fragment subSubChapterFragment = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mContentView = inflater.inflate(
R.layout.competitive_programming_exercise, container, false);
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setContentShown(false);
setContentView(mContentView);
processTask = new ProcessTask();
processTask.execute();
}
protected class ProcessTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
// background task
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
chapterFragment = new ChaptersListFragment();
if (mContentView.findViewById(R.id.fragment_container) != null) {
transaction.replace(R.id.fragment_container, chapterFragment);
} else {
subChapterFragment = new SubChaptersListFragment();
subSubChapterFragment = new SubSubChaptersListFragment();
transaction.replace(R.id.category_fragment, chapterFragment);
transaction.replace(R.id.sub_category_fragment, subChapterFragment);
transaction.replace(R.id.sub_sub_category_fragment, subSubChapterFragment);
}
transaction.commit();
setContentShown(true);
}
}
static protected class Chapter {
String chapterTitle;
List<SubChapter> subchapterList;
public Chapter(String chapterTitle, List<SubChapter> subchapterList) {
this.chapterTitle = chapterTitle;
this.subchapterList = subchapterList;
}
}
@Override
public void onChapterSelected(int position) {
SubChaptersListFragment subChaptersListFrag = (SubChaptersListFragment) getChildFragmentManager()
.findFragmentById(R.id.sub_category_fragment);
if (subChaptersListFrag != null) {
subChaptersListFrag.updateList(position);
} else {
SubChaptersListFragment subChapterFragment = new SubChaptersListFragment();
Bundle args = new Bundle();
args.putInt(SubChaptersListFragment.CHAPTER_POSITION, position);
subChapterFragment.setArguments(args);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
transaction.replace(R.id.fragment_container, subChapterFragment);
// transaction.addToBackStack(null);
transaction.commit();
}
}
@Override
public void onSubChapterSelected(int prev, int position) {
SubSubChaptersListFragment subSubChaptersListFrag = (SubSubChaptersListFragment) getChildFragmentManager()
.findFragmentById(R.id.sub_sub_category_fragment);
if (subSubChaptersListFrag != null) {
subSubChaptersListFrag.updateList(prev, position);
} else {
SubSubChaptersListFragment subSubChapterFragment = new SubSubChaptersListFragment();
Bundle args = new Bundle();
args.putIntArray(SubSubChaptersListFragment.POSITIONS, new int[]{prev, position});
subSubChapterFragment.setArguments(args);
FragmentTransaction transaction = getChildFragmentManager()
.beginTransaction();
transaction.replace(R.id.fragment_container, subSubChapterFragment);
// transaction.addToBackStack(null);
transaction.commit();
}
}
@Override
public void onStop() {
super.onStop();
if (processTask != null && processTask.getStatus() != AsyncTask.Status.FINISHED) {
processTask.cancel(true);
}
}
}
Hope this would help!
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