Swipe View Design
Before implementing these features, you should understand the concepts and recommendations as described inDesigning Effective Navigation and the Swipe Views design guide.
Implement Swipe Views
You can create swipe views in your app using the ViewPagerwidget, available in the Support Library. The ViewPager is a layout widget in which each child view is a separate page (a separate tab) in the layout.
To set up your layout with ViewPager, add a <ViewPager> element to your XML layout. For example, if each page in the swipe view should consume the entire layout, then your layout looks like this:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
To insert child views that represent each page, you need to hook this layout to a PagerAdapter. There are two kinds of adapter you can use:
FragmentPagerAdapter- This is best when navigating between sibling screens representing a fixed, small number of pages.
FragmentStatePagerAdapter- This is best for paging across a collection of objects for which the number of pages is undetermined. It destroys fragments as the user navigates to other pages, minimizing memory usage.
For example, here's how you might use FragmentStatePagerAdapter to swipe across a collection of Fragmentobjects:
public class CollectionDemoActivity extends FragmentActivity {
// When requested, this adapter returns a DemoObjectFragment,
// representing an object in the collection.
DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
ViewPager mViewPager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_collection_demo);
// ViewPager and its adapters use support library
// fragments, so use getSupportFragmentManager.
mDemoCollectionPagerAdapter =
new DemoCollectionPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mDemoCollectionPagerAdapter);
}
}
// Since this is an object collection, use a FragmentStatePagerAdapter,
// and NOT a FragmentPagerAdapter.
public class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
public DemoCollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
Fragment fragment = new DemoObjectFragment();
Bundle args = new Bundle();
// Our object is just an integer :-P
args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return 100;
}
@Override
public CharSequence getPageTitle(int position) {
return "OBJECT " + (position + 1);
}
}
// Instances of this class are fragments representing a single
// object in our collection.
public static class DemoObjectFragment extends Fragment {
public static final String ARG_OBJECT = "object";
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
// The last two arguments ensure LayoutParams are inflated
// properly.
View rootView = inflater.inflate(
R.layout.fragment_collection_object, container, false);
Bundle args = getArguments();
((TextView) rootView.findViewById(android.R.id.text1)).setText(
Integer.toString(args.getInt(ARG_OBJECT)));
return rootView;
}
}
This example shows only the code necessary to create the swipe views. The following sections show how you can add tabs to help facilitate navigation between pages.
Add Tabs to the Action Bar
Action bar tabs offer users a familiar interface for navigating between and identifying sibling screens in your app.
To create tabs using ActionBar, you need to enable NAVIGATION_MODE_TABS, then create several instances ofActionBar.Tab and supply an implementation of the ActionBar.TabListener interface for each one. For example, in your activity's onCreate() method, you can use code similar to this:
@Override
public void onCreate(Bundle savedInstanceState) {
final ActionBar actionBar = getActionBar();
...
// Specify that tabs should be displayed in the action bar.
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Create a tab listener that is called when the user changes tabs.
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
// show the given tab
}
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
// hide the given tab
}
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
// probably ignore this event
}
};
// Add 3 tabs, specifying the tab's text and TabListener
for (int i = 0; i < 3; i++) {
actionBar.addTab(
actionBar.newTab()
.setText("Tab " + (i + 1))
.setTabListener(tabListener));
}
}
How you handle the ActionBar.TabListener callbacks to change tabs depends on how you've constructed your content. But if you're using fragments for each tab with ViewPager as shown above, the following section shows how to switch between pages when the user selects a tab and also update the selected tab when the user swipes between pages.
Change Tabs with Swipe Views
To switch between pages in a ViewPager when the user selects a tab, implement your ActionBar.TabListener to select the appropriate page by calling setCurrentItem() on your ViewPager:
@Override
public void onCreate(Bundle savedInstanceState) {
...
// Create a tab listener that is called when the user changes tabs.
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
// When the tab is selected, switch to the
// corresponding page in the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
...
};
}
Likewise, you should select the corresponding tab when the user swipes between pages with a touch gesture. You can set up this behavior by implementing the ViewPager.OnPageChangeListener interface to change the current tab each time the page changes. For example:
@Override
public void onCreate(Bundle savedInstanceState) {
...
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// When swiping between pages, select the
// corresponding tab.
getActionBar().setSelectedNavigationItem(position);
}
});
...
}
Use a Title Strip Instead of Tabs
If you don't want to include action bar tabs and prefer to provide scrollable tabs for a shorter visual profile, you can use PagerTitleStrip with your swipe views.
Below is an example layout XML file for an activity whose entire contents are a ViewPager and a top-alignedPagerTitleStrip inside it. Individual pages (provided by the adapter) occupy the remaining space inside theViewPager.
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<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:textColor="#fff"
android:paddingTop="4dp"
android:paddingBottom="4dp" />
</android.support.v4.view.ViewPager>
