我正在开发一款Android应用程序,需要在导航抽屉的片段中实现Viewpager或选项卡。我已经按照这个教程实现了导航抽屉:导航抽屉教程
现在我的导航抽屉由3个片段组成:Fragment A、Fragment B和Fragment C。在Fragment A中,我该如何添加一个Viewpager?
private class MyPagerAdapter extends FragmentPagerAdapter
{
public MyPagerAdapter (FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
return Fragment1;
case 1:
return Fragment2;
}
}
@Override
public int getCount() {
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return FRAGMENT_1_NAME;
case 1:
return FRAGMENT_2_NAME;
}
}
myPagerAdapter = new MyPagerAdapter(this.getChildFragmentManager());
myPager = (ViewPager) mRoot.findViewById(R.id.pager);
myPager.setAdapter(myPagerAdapter);
onCreateView
方法中,当您填充根View
时,请填充包含android.support.v4.view.ViewPager
的布局:View rootView = inflater.inflate(R.layout.your_viewpager_layout, container, false);
your_viewpager_layout.xml
应该类似于以下内容:
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.yourapp.YourActivity" />
FragmentPagerAdapter.getItem(int position)
方法中,返回你想在ViewPager
中显示的Fragment
,就像在“普通”的ViewPager中一样。请保留HTML标签。有一个ViewPager类是支持库的一部分。您应该能够与PagerAdapter一起使用它。
好的,这是选项卡或视图分页器片段类的代码:
public class TabbedFragment extends Fragment {
private SectionsPagerAdapter mSectionsPagerAdapter;
public static final String TAG = TabbedFragment.class.getSimpleName();
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
public static TabbedFragment newInstance() {
return new TabbedFragment();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_viewpager_network, container, false);
mSectionsPagerAdapter = new SectionsPagerAdapter(
getChildFragmentManager());
mViewPager = (ViewPager) v.findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
return v;
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
if (position == 0)
return FragmentOne.getInstance();
else
return FragmentTwo.getInstance();
}
@Override
public int getCount() {
// Show 2 total pages.
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return "Fragment 1";
case 1:
return "Fragment 2";
}
return null;
}
}
}
XML文件tabbed_fragment.xml
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--
This title strip will display the currently visible page title, as well as the page
titles for adjacent pages.
-->
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#33b5e5"
android:paddingBottom="4dp"
android:paddingTop="4dp"
android:textColor="#fff" />
</android.support.v4.view.ViewPager>
在使用导航抽屉的活动类中的用法,注意:我使用了Android Studio 1.2预先提供的导航抽屉代码。
@Override
public void onNavigationDrawerItemSelected(int position) {
boolean isChild = getSharedPreferences(Constansts.PREFERENCE_NAME,0).getBoolean(Constansts.IS_CHILD,false);
Fragment fragment = null;
if (lastSelectedPosition == position)
return;
lastSelectedPosition = position;
switch (position) {
case 0:
fragment = HomeFragment.getInstance();
break;
case 1:
fragment = HomeFragment.getInstance();
break;
case 2:
fragment = UserProfileFragment.getInstance();
break;
case 3:
fragment = TabbedFragment.getInstance();
break;
}
if (fragment == null) {
fragment = HomeFragment.getInstance();
}
fragmentManager = getSupportFragmentManager();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container, fragment).addToBackStack(mTitle.toString());
fragmentTransaction.commit();
}