Android FragmentPagerAdapter翻译

FragmentPagerAdapter

Class Overview

publicclassFragmentPagerSupportextendsFragmentActivity{
staticfinalint NUM_ITEMS =10;

MyAdapter mAdapter;

ViewPager mPager;

@Override
protectedvoid onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_pager);

mAdapter =newMyAdapter(getSupportFragmentManager());

mPager =(ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);

// Watch for button clicks.
Button button =(Button)findViewById(R.id.goto_first);
button.setOnClickListener(newOnClickListener(){
publicvoid onClick(View v){
mPager.setCurrentItem(0);
}
});
button =(Button)findViewById(R.id.goto_last);
button.setOnClickListener(newOnClickListener(){
publicvoid onClick(View v){
mPager.setCurrentItem(NUM_ITEMS-1);
}
});
}

publicstaticclassMyAdapterextendsFragmentPagerAdapter{
publicMyAdapter(FragmentManager fm){
super(fm);
}

@Override
publicint getCount(){
return NUM_ITEMS;
}

@Override
publicFragment getItem(int position){
returnArrayListFragment.newInstance(position);
}
}

publicstaticclassArrayListFragmentextendsListFragment{
int mNum;

/**
* Create a new instance of CountingFragment, providing "num"
* as an argument.
*/
staticArrayListFragment newInstance(int num){
ArrayListFragment f =newArrayListFragment();

// Supply num input as an argument.
Bundle args =newBundle();
args.putInt("num", num);
f.setArguments(args);

return f;
}

/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
publicvoid onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
mNum = getArguments()!=null? getArguments().getInt("num"):1;
}

/**
* The Fragment's UI is just a simple text view showing its
* instance number.
*/
@Override
publicView onCreateView(LayoutInflater inflater,ViewGroup container,
Bundle savedInstanceState){
View v = inflater.inflate(R.layout.fragment_pager_list, container,false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText("Fragment #"+ mNum);
return v;
}

@Override
publicvoid onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
setListAdapter(newArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1,Cheeses.sCheeseStrings));
}

@Override
publicvoid onListItemClick(ListView l,View v,int position,long id){
Log.i("FragmentList","Item clicked: "+ id);
}
}
}

R.layout.fragment_pager

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent"android:layout_height="match_parent">

<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1">
</android.support.v4.view.ViewPager>

<LinearLayoutandroid:orientation="horizontal"
android:gravity="center"android:measureWithLargestChild="true"
android:layout_width="match_parent"android:layout_height="wrap_content"
android:layout_weight="0">
<Buttonandroid:id="@+id/goto_first"
android:layout_width="wrap_content"android:layout_height="wrap_content"
android:text="@string/first">
</Button>
<Buttonandroid:id="@+id/goto_last"
android:layout_width="wrap_content"android:layout_height="wrap_content"
android:text="@string/last">
</Button>
</LinearLayout>
</LinearLayout>

R.layout.fragment_pager_list

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:drawable/gallery_thumb">

<TextViewandroid:id="@+id/text"
android:layout_width="match_parent"android:layout_height="wrap_content"
android:gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/hello_world"/>

<!-- The frame layout is here since we will be showing either
the empty view or the list view.  -->
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1">
<!-- Here is the list. Since we are using a ListActivity, we
have to call it "@android:id/list" so ListActivity will
find it -->
<ListViewandroid:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"/>

<!-- Here is the view to show if the list is emtpy -->
<TextViewandroid:id="@android:id/empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="No items."/>

</FrameLayout>

</LinearLayout>

Summary

[Expand] Inherited Constants
From class android.support.v4.view.PagerAdapter

instantiateItem(ViewGroup, int)