[Xamarin] 製作可以滑動的Tab
之前幾篇文章,是利用一個網路上的open source ( https://github.com/Cheesebaron/ViewPagerIndicator ) 來製作,但是後來發現原來Xamarin Component 裡面有一個 Material Pager Sliding Tab Strip 也有一個可以做出滑動的Slider Tab ,基本上就是中規中矩比較符合Material Design
1. 首先打開專案後 在 Components 下載 Material Pager Sliding Tab Strip
2. 引入後,在主layout 端加入 com.refractored.PagerSlidingTabStrip , 還有 android.support.v4.view.ViewPager
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fitsSystemWindows="true">
<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="12dp"
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=".MainActivity" />
</LinearLayout>
3. main activity 的部分 我們要繼承 AppCompatActivity, IOnTabReselectedListener, ViewPager.IOnPageChangeListener ,並且初始化 tab and pager
// 初始化 ViewPager 和 adapter
var pager = FindViewById<ViewPager>(Resource.Id.pager);
pager.Adapter = new TestAdapter(SupportFragmentManager);
// 載入上放頁籤
var tabs = FindViewById<PagerSlidingTabStrip>(Resource.Id.tabs);
tabs.SetViewPager(pager);
//加入事件
tabs.OnTabReselectedListener = this;
tabs.OnPageChangeListener = this;
4. 其中 TestAdapter
public class TestAdapter : FragmentPagerAdapter
{
private readonly string[] Titles =
{
"Categories", "Home", "Top Paid", "Top Free", "Top Grossing", "Top New Paid",
"Top New Free", "Trending"
};
public TestAdapter(FragmentManager fm) : base(fm)
{
}
public override ICharSequence GetPageTitleFormatted(int position)
{
return new Java.Lang.String(Titles[position % Titles.Length]);
}
#region implemented abstract members of PagerAdapter
public override int Count
{
get { return Titles.Length; }
}
#endregion
#region implemented abstract members of FragmentPagerAdapter
public override Fragment GetItem(int position)
{
var res = new TabContentFragment();
res.Content = Titles[position % Titles.Length];
return res;
}
#endregion
}
其中幾點必須注意 :
1. 我是改寫 https://github.com/jamesmontemagno/PagerSlidingTabStrip-for-Xamarin.Android 的範例,如果覺得我寫得不夠詳細,可以參考這裡
2.因為他其中範例用到lib 會比較多 包含 CardView 所以我把範例單純化,變成自訂的fragment 這樣比較貼切一般使用
Source: https://www.dropbox.com/s/nwzyl8ak8hzomuo/SliderTest2_fix_20140910.7z?dl=0