如何在片段中的一个选项卡与另一个选项卡之间切换时动态刷新选项卡内容? [英] How to refresh tabs content dynamically while switching between one tab to other in fragment?
本文介绍了如何在片段中的一个选项卡与另一个选项卡之间切换时动态刷新选项卡内容?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
我有一个名为 CourseActivity.java 的活动，因为我有 2 个选项卡，名称分别为 UserCourses 和 FavouriteCourses.我在第一个选项卡中有一些课程列表.它有图标，在选择图标时，相应的粗略将添加到 Favouritecourse 列表.但我的问题是当我去最喜欢的课程选项卡时，内容不会更新，直到我刷新它或我注销并再次登录到应用程序.
I have Activity called CourseActivity.java,in that i have 2 tabs by names UserCourses and FavouriteCourses.I have some list of courses in first tab.And it have icon,on selecting icon te respective coarse will be added to Favouritecourse list.But my problem is when i go to Favourite Course tab,the content will not update untill i refresh it or i logout and login again to app.
这是 CoarseActivity.java.这会将课程类型发送到 CourseFragment.java
Here is CoarseActivity.java.This will send type of course to CourseFragment.java
//display content of tabs on touch of tabs
class CourseTabsAdapter extends FragmentStatePagerAdapter {
public CourseTabsAdapter(FragmentManager fm)
{
super(fm);
}
@Override
public Fragment getItem(int position) {
/*
* We use bundle to pass course listing type because, by using other
* methods we will lose the listing type information in the fragment
* on onResume (this calls empty constructor). For the same reason
* interface may not work. Bundles are passed again on onResume
*/
switch (position) {
case 0:
/*LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(CourseActivity.this);
Intent i = new Intent("TAG_REFRESH");
lbm.sendBroadcast(i);*/
CourseFragment userCourses = new CourseFragment();
// Set the listing type to only user courses in bundle.
Bundle bundle = new Bundle();
bundle.putInt("coursesType", CourseFragment.TYPE_USER_COURSES);
userCourses.setArguments(bundle);
return userCourses;
case 1:
CourseFragment favCourses = new CourseFragment();
/*favCourses.onRefresh();*/
/*new courseSyncerBg().execute("");*/
// Set the listing type to only user courses in bundle.
Bundle bundle1 = new Bundle();
bundle1.putInt("coursesType", CourseFragment.TYPE_FAV_COURSES);
favCourses.setArguments(bundle1);
return favCourses;
}
return null;
}
这是我的 CourseFragment.java
And this is my CourseFragment.java
public class CourseFragment extends Fragment implements OnRefreshListener {
/**
* List all courses in Moodle site
*/
public static final int TYPE_ALL_COURSES = 0;
/**
* List only user courses
*/
public static final int TYPE_USER_COURSES = 1;
/**
* List only courses favourited by user
*/
public static final int TYPE_FAV_COURSES = 2;
CourseListAdapter courseListAdapter;
SessionSetting session;
List<MoodleCourse> mCourses;
int Type = 0;
LinearLayout courseEmptyLayout;
SwipeRefreshLayout swipeLayout;
/**
* Pass the course listing type as a bundle param of type int with name
* coursesType
*/
public CourseFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (this.getArguments() != null)
Type = this.getArguments().getInt("coursesType", TYPE_USER_COURSES);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.frag_courses, container,
false);
// Get all courses of this site
session = new SessionSetting(getActivity());
if (Type == TYPE_USER_COURSES)
mCourses = MoodleCourse.find(MoodleCourse.class,
"siteid = ? and is_user_course = ?",
session.getCurrentSiteId() + "", "1");
else if (Type == TYPE_FAV_COURSES)
mCourses = MoodleCourse.find(MoodleCourse.class,
"siteid = ? and is_fav_course = ?",
session.getCurrentSiteId() + "", "1");
else
mCourses = MoodleCourse.find(MoodleCourse.class, "siteid = ?",
session.getCurrentSiteId() + "");
courseEmptyLayout = (LinearLayout) rootView
.findViewById(R.id.course_empty_layout);
ListView courseList = (ListView) rootView
.findViewById(R.id.content_course);
courseListAdapter = new CourseListAdapter(getActivity());
courseList.setAdapter(courseListAdapter);
swipeLayout = (SwipeRefreshLayout) rootView
.findViewById(R.id.swipe_refresh);
Workaround.linkSwipeRefreshAndListView(swipeLayout, courseList);
swipeLayout.setOnRefreshListener(this);
// We don't want to run sync in each course listing
if (Type == TYPE_USER_COURSES)
new courseSyncerBg().execute("");
return rootView;
}
public class CourseListAdapter extends BaseAdapter {
private final Context context;
public CourseListAdapter(Context context) {
this.context = context;
if (!mCourses.isEmpty())
courseEmptyLayout.setVisibility(LinearLayout.GONE);
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
final ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item_course,
parent, false);
viewHolder.shortname = (TextView) convertView
.findViewById(R.id.list_course_shortname);
viewHolder.fullname = (TextView) convertView
.findViewById(R.id.list_course_fullname);
viewHolder.favIcon = (ImageView) convertView
.findViewById(R.id.list_course_fav);
// Save the holder with the view
convertView.setTag(viewHolder);
} else {
// Just use the viewHolder and avoid findviewbyid()
viewHolder = (ViewHolder) convertView.getTag();
}
// Assign values
final MoodleCourse mCourse = mCourses.get(position);
viewHolder.shortname.setText(mCourse.getShortname());
viewHolder.fullname.setText(mCourse.getFullname());
if (mCourses.get(position).getIsFavCourse())
viewHolder.favIcon.setImageResource(R.drawable.icon_favorite);
else
viewHolder.favIcon
.setImageResource(R.drawable.icon_favorite_outline);
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(context, CourseContentActivity.class);
i.putExtra("courseid", mCourses.get(position).getCourseid());
context.startActivity(i);
}
});
viewHolder.favIcon.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// Simply unfav if that's the case
if (mCourse.getIsFavCourse()) {
mCourse.setIsFavCourse(!mCourse.getIsFavCourse());
mCourse.save();
// Update listview
mCourses.get(position).setIsFavCourse(
mCourse.getIsFavCourse());
courseListAdapter.notifyDataSetChanged();
// Update listview
mCourses.get(position).setIsFavCourse(
mCourse.getIsFavCourse());
courseListAdapter.notifyDataSetChanged();
return;
}
// If fav'ing, ask for confirmation. We will be doing a sync
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
context);
alertDialogBuilder
.setMessage("This will make course contents offline and sends notifications for new contents if enabled");
alertDialogBuilder.setTitle("Add "
+ mCourses.get(position).getShortname()
+ " to favourites?");
alertDialogBuilder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0,
int arg1) {
mCourse.setIsFavCourse(!mCourse
.getIsFavCourse());
mCourse.save();
// Update listview
mCourses.get(position).setIsFavCourse(
mCourse.getIsFavCourse());
courseListAdapter.notifyDataSetChanged();
// Start sync service for course
Intent i = new Intent(context,
MDroidService.class);
i.putExtra("notifications", false);
i.putExtra("siteid",
session.getCurrentSiteId());
i.putExtra("courseid",
mCourse.getCourseid());
context.startService(i);
}
});
alertDialogBuilder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
});
return convertView;
}
@Override
public int getCount() {
return mCourses.size();
}
@Override
public Object getItem(int position) {
return mCourses.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
}
static class ViewHolder {
TextView shortname;
TextView fullname;
ImageView favIcon;
}
/**
* Syncs the courses of the current user in background and updates list *
*
* @author Praveen Kumar Pendyala (praveen@praveenkumar.co.in)
*
*/
private class courseSyncerBg extends AsyncTask<String, Integer, Boolean> {
@Override
protected void onPreExecute() {
swipeLayout.setRefreshing(true);
}
@Override
protected Boolean doInBackground(String... params) {
CourseSyncTask cs = new CourseSyncTask(session.getmUrl(),
session.getToken(), session.getCurrentSiteId());
return cs.syncUserCourses();
}
@Override
protected void onPostExecute(Boolean result) {
if (Type == TYPE_USER_COURSES)
mCourses = MoodleCourse.find(MoodleCourse.class,
"siteid = ? and is_user_course = ?",
session.getCurrentSiteId() + "", "1");
else if (Type == TYPE_FAV_COURSES)
mCourses = MoodleCourse.find(MoodleCourse.class,
"siteid = ? and is_fav_course = ?",
session.getCurrentSiteId() + "", "1");
else
mCourses = MoodleCourse.find(MoodleCourse.class,
"siteid = ? and ", session.getCurrentSiteId() + "");
courseListAdapter.notifyDataSetChanged();
if (!mCourses.isEmpty())
courseEmptyLayout.setVisibility(LinearLayout.GONE);
swipeLayout.setRefreshing(false);
}
}
@Override
public void onRefresh() {
new courseSyncerBg().execute("");
}
}
请帮我解决问题.我已经在下面提到了一个.但是我无法得到我的问题的答案.
Please help me to sortout problem.I already refered below one.But i couldnt get answer to my problem.
http://stackoverflow.com/questions/10849552/update-viewpager-dynamically/17855730#17855730
http://stackoverflow.com/questions/10849552/update-viewpager-dynamically/17855730#17855730
推荐答案
你应该在你的片段中重写 setUserVisibleHint 方法并将你的刷新代码放入其中
you should override setUserVisibleHint method in your fragment and put your refreshing code in it
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser && isResumed()) {
}
}
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