如何解决如何在运行时使用 ChildFragmentManager 替换 Fragment 并且此片段没有 PagerSlidingTabStrip Xamarin.Android 的标题
我想在运行时使用其他片段更改寻呼机布局，但没有 PagerSlidingTabStrip 标题。我怎么能做到。 其次如何.我可以在另一个片段中调用方法 home Fragment。
这是家庭布局
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_marginBottom="50dp"
android:id="@+id/SlidingStrips"
android:layout_marginTop="10dp"
android:layout_below="@id/AcountBalance">
<com.refractored.PagerSlidingTabStrip
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:pstsPaddingMiddle="true"
app:pstsDividerWidth="1dp"
app:pstsDividerPadding="5dp"
app:pstsDividerColor="#50FFFFFF"
android:textColor="#50FFFFFF"
app:pstsTextColorSelected="@android:color/white"
app:pstsIndicatorColor="@android:color/white"
app:pstsUnderlineColor="@android:color/white" />
<!--Change this to true if you want to center items-->
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
tools:context=".HomeFragmentLayout" />
</LinearLayout>
我在这里添加片段的方式是与父片段一起添加的 ChildFragments 这两个片段添加了两个带有小时和日标签的标签。
public class HomeFragment : Fragment,IOnTabReselectedListener,ViewPager.IOnPagechangelistener
{
View view;
private MyPagerAdapter adapter;
private int count = 1;
private int currentColor;
List<Android.Support.V4.App.Fragment> fragments = new List<Android.Support.V4.App.Fragment>();
public static ViewPager pager;
private PagerSlidingTabStrip tabs;
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your fragment here
}
public static HomeFragment NewInstance()
{
var frag1 = new HomeFragment { Arguments = new Bundle() };
return frag1;
}
public override View OnCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState)
{
base.OnCreateView(inflater,container,savedInstanceState);
if (view == null)
{
view = inflater.Inflate(Resource.Layout.HomeFragmentLayout,false);
return view;
}
else
{
return view;
}
}
public override void OnViewCreated(View view,Bundle savedInstanceState)
{
base.OnViewCreated(view,savedInstanceState);
try
{
fragments.Add(new HourlyFragment());
fragments.Add(new DayFragment());
adapter = new MyPagerAdapter(ChildFragmentManager,fragments);
pager = view.FindViewById<ViewPager>(Resource.Id.pager);
tabs = View.FindViewById<PagerSlidingTabStrip>(Resource.Id.tabs);
pager.Adapter = adapter;
tabs.SetViewPager(pager);
var pageMargin = (int)TypedValue.ApplyDimension(ComplexUnitType.Dip,4,Resources.displayMetrics);
pager.PageMargin = pageMargin;
pager.CurrentItem = 0;
tabs.OnTabReselectedListener = this;
tabs.OnPagechangelistener = this;
}
catch (System.Exception ex)
{
}
}
.// public void ReplaceFragment(Fragment fragment)
//{
// try
// {
// FragmentManager manager = ChildFragmentManager;
// FragmentTransaction transaction = manager.BeginTransaction();
// transaction.Add(Resource.Id.content_frame,fragment);
// transaction.Commit();
// }
// catch (System.Exception ex)
// {
// }
//}
public void OnTabReselected(int position)
{
Toast.MakeText(Context.ApplicationContext,"Tab reselected: " + position,ToastLength.Short).Show();
}
public void OnPageScrollStateChanged(int state)
{
Console.WriteLine("Page scroll state changed: " + state);
}
public void OnPageScrolled(int position,float positionOffset,int positionOffsetPixels)
{
Console.WriteLine("Page Scrolled");
}
public void OnPageSelected(int position)
{
Console.WriteLine("Page selected: " + position);
}
}
这是寻呼机适配器
public class MyPagerAdapter : FragmentPagerAdapter
{
List<Android.Support.V4.App.Fragment> fragments;
private readonly string[] Titles =
{
"Hour","Day"
};
public MyPagerAdapter(FragmentManager fm,List<Android.Support.V4.App.Fragment> fragments) : base(fm)
{
this.fragments = fragments;
}
public override ICharSequence GetPageTitleFormatted(int position)
{
return new String(Titles[position]);
}
//}
public override int Count { get { return fragments.Count; } }
public override Fragment GetItem(int position)
{
return fragments[position];
}
public override long GetItemId(int position)
{
return base.GetItemId(position);
}
}
解决方法
你可以像下面这样，假设你需要调用 HomeFragment 中的替换方法。
在您的 MyPagerAdapter 类中添加以下代码（如何在运行时替换片段）：
private bool[] flags;
public override int GetItemPosition(Java.Lang.Object @object)
{
return PositionNone;
}
public override Java.Lang.Object InstantiateItem(ViewGroup container,int position)
{
if (flags != null && flags[position])
{
/** Get the cached fragment and replace it with a new fragment*/
Android.Support.V4.App.Fragment fragment = (Android.Support.V4.App.Fragment)base.InstantiateItem(container,position);
string fragmentTag = fragment.Tag;
Android.Support.V4.App.FragmentTransaction ft = fm.BeginTransaction();
ft.Remove(fragment);
fragment = fragments[position];
ft.Add(container.Id,fragment,fragmentTag);
ft.Attach(fragment);
ft.Commit();
/** Set to false when the replacement is complete*/
flags[position] = false;
if (fragment != null)
{
return fragment;
}
else
{
return base.InstantiateItem(container,position);
}
}
else
{
return base.InstantiateItem(container,position);
}
}
public void setFragments(List<Android.Support.V4.App.Fragment> fragments)
{
if (this.fragments != null)
{
flags = new bool[fragments.Count];
for (int i = 0; i < fragments.Count; i++)
{
flags[i] = true;
}
}
this.fragments = fragments;
NotifyDataSetChanged();
}
然后是 HomeFragment 中的替换方法：
public void ReplaceFragment()
{
fragments[0] = new NewFragment(); //suppose you want to replace the first HourlyFragment
fragments[1] = new DayFragment();
adapter.setFragments(fragments);
}
在其他片段（例如点击事件）中，您可以调用 HomeFragment 中的替换方法，例如：
private void Button_Click(object sender,EventArgs e)
{
foreach (Android.Support.V4.App.Fragment fragment in Activity.SupportFragmentManager.Fragments)
{
if (fragment is HomeFragment)
{
((HomeFragment)fragment).ReplaceFragment();
}
}
}
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
