我的应用内部有一个片段可以完成很多后台工作,因此需要很长时间才能加载。我想从我的主要活动中显示一个ProgressBar,并在片段加载后隐藏它。
问题是,由于整个用户界面冻结,进度条无法显示,或者卡住了。
如何在片段加载时显示ProgressBar? 感谢。
编辑:片段内的代码:
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your fragment here
fragments = new Fragment[]
{
new HalachotFragment(),
new BooksFragment(),
};
var titles = CharSequence.ArrayFromStringArray(new[]
{
"הלכות",
"ספרים",
});
tabsAdapter = new TabsFragmentPagerAdapter(ChildFragmentManager, fragments, titles);
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Use this to return your custom view for this Fragment
var view = inflater.Inflate(Resource.Layout.HalachaSection, container, false);
//var progressBar = Activity.FindViewById<ProgressBar>(Resource.Id.progressBar);
halachotPager = view.FindViewById<ViewPager>(Resource.Id.halachotPager);
halachotPager.Adapter = tabsAdapter;
halachotPager.OffscreenPageLimit = 2;
halachotPager.SetCurrentItem(1, true);
// Bind the tabs to the ViewPager
tabs = Activity.FindViewById<TabLayout>(Resource.Id.tabs);
tabs.SetupWithViewPager(halachotPager);
//var toolbar = Activity.FindViewById<Android.Support.V7.Widget.Toolbar>(Resource.Id.toolbar);
tabs.Visibility = ViewStates.Visible;
//progressBar.Visibility = ViewStates.Gone;
return view;
}
BookFragment:
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
// Use this to return your custom view for this Fragment
// return inflater.Inflate(Resource.Layout.YourFragment, container, false);
View view = inflater.Inflate(Resource.Layout.Books, container, false);
mRecyclerView = view.FindViewById<RecyclerView>(Resource.Id.booksRecyclerView);
mRecyclerView.NestedScrollingEnabled = false;
mBooks = new List<Book>();
ImageView cover = new ImageView(Activity);
//cover = view.FindViewById<ImageView>(Resource.Id.coverImage);
cover.SetImageResource(Resource.Drawable.Torat_Hamachane1);
mBooks.Add(new Book() { Title = "תורת המחנה א' - הלכות יום ויום", Cover = cover, imageResourceId = Resource.Drawable.Torat_Hamachane1});
//Create our layout manager
mLayoutManager = new GridLayoutManager(Activity, 2);
mLayoutManager.AutoMeasureEnabled = true;
//mRecyclerView.SetForegroundGravity(GravityFlags.CenterHorizontal);
mRecyclerView.SetLayoutManager(mLayoutManager);
SimpleItemAnimator x = null;
mRecyclerView.SetItemAnimator(x);
mAdapter = new RecyclerAdapter(mBooks, mRecyclerView, Activity);
mRecyclerView.SetAdapter(mAdapter);
cover = new ImageView(Activity);
cover.SetImageResource(Resource.Drawable.kitzurTHM);
mBooks.Add(new Book() { Title = "קיצור תורת המחנה - הלכות יום ויום ושבת", Cover = cover, imageResourceId = Resource.Drawable.kitzurTHM, Content = "KitzurTHM/KitzurTHMFull.html" });
cover = new ImageView(Activity);
ImageView newCover = new ImageView(Activity);
newCover.SetImageResource(Resource.Drawable.halkasPurim);
mBooks.Add(new Book() { Title = "הלכה כסדרה - הלכות פורים", Cover = newCover, imageResourceId = Resource.Drawable.halkasPurim });
cover = new ImageView(Activity);
cover.SetImageResource(Resource.Drawable.halkasPesach);
mBooks.Add(new Book() { Title = "הלכה כסדרה - הלכות פסח", Cover = cover, imageResourceId= Resource.Drawable.halkasPesach });
cover = new ImageView(Activity);
cover.SetImageResource(Resource.Drawable.netzach);
mBooks.Add(new Book() { Title = "שו\"ת נצח יהודה", Cover = cover , imageResourceId = Resource.Drawable.netzach});
cover = new ImageView(Activity);
cover.SetImageResource(Resource.Drawable.tankim);
mBooks.Add(new Book() { Title = "טיפול בטנקים בשבת", Cover = cover , imageResourceId = Resource.Drawable.tankim});
cover = new ImageView(Activity);
cover.SetImageResource(Resource.Drawable.tipulBeChalalim);
mBooks.Add(new Book() { Title = "טיפול בחללים בשבת", Cover = cover , imageResourceId = Resource.Drawable.tipulBeChalalim, Content = "TipulBechalalimShabbat.html" });
Refresh();
return view;
}
HalachotFragment解析文档,这也需要很长时间。
答案 0 :(得分:0)
您可以在主活动中使用ProgressBar,并且只要您更改片段显示进度条以及加载片段时隐藏该进度条,就可以将Make Progressbar对象设置为静态。
答案 1 :(得分:0)
每当片段更改时,请尝试runOnUiThread
以下代码,
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
ProgressDialog pd = new ProgressDialog(Activity.this);
pd.setMessage("Testing...");
pd.show();
}
});
如果要隐藏,ProgressDialog
表示使用,
pd.hide();
希望这会对你有所帮助。
答案 2 :(得分:0)
首先,您需要发布部分代码。
如何在片段加载时显示ProgressBar?
当你从活动中调用片段时,将调用片段的onAttach()
方法。所以那时你需要在那个方法中获取你的活动对象引用。喜欢,
MainActivity mainActivity; // this should be global
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
mainActivity = (MainActivity)activity;
}
因此,使用活动对象,您可以访问进度条对象并将其隐藏在setUserVisibleHint()
方法中,以便完全加载片段。
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
// TODO Auto-generated method stub
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
// hide progress bar
}
}