试试这个代码： -
主要活动
public class MainActivity extends FragmentActivity implements
ActionBar.TabListener {
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the primary sections of the app.
*/
public static class AppSectionsPagerAdapter extends FragmentPagerAdapter {
public AppSectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return 4;
}
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
// The first section of the app is the most interesting -- it
// offers
// a launchpad into the other demonstrations in this example
// application.
i++;
return new LaunchpadSectionFragment();
case 1:
// The first section of the app is the most interesting -- it
// offers
// a launchpad into the other demonstrations in this example
// application.
i++;
return new LaunchpadSectionFragment();
case 2:
// The first section of the app is the most interesting -- it
// offers
// a launchpad into the other demonstrations in this example
// application.
i++;
return new LaunchpadSectionFragment();
case 3:
// The first section of the app is the most interesting -- it
// offers
// a launchpad into the other demonstrations in this example
// application.
i++;
return new LaunchpadSectionFragment();
case 4:
// The first section of the app is the most interesting -- it
// offers
// a launchpad into the other demonstrations in this example
// application.
i++;
return new LaunchpadSectionFragment();
default:
// The other sections of the app are dummy placeholders.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, i + 1);
fragment.setArguments(args);
return fragment;
}
}
@Override
public CharSequence getPageTitle(int position) {
String name = null;
switch (position) {
case 0:
name = "School Info";
break;
case 1:
name = "Picture (s)";
break;
default:
name = "Group";
break;
}
return name;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_section_dummy,
container, false);
Bundle args = getArguments();
((TextView) rootView.findViewById(android.R.id.text1))
.setText(getString(R.string.dummy_section_text,
args.getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
/**
* A fragment that launches other parts of the demo application.
*/
public static class LaunchpadSectionFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_section_launchpad, container, false);
// Demonstration of a collection-browsing activity.
rootView.findViewById(R.id.demo_collection_button)
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(),
CollectionDemoActivity.class);
startActivity(intent);
}
});
// Demonstration of navigating to external activities.
rootView.findViewById(R.id.demo_external_activity)
.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Create an intent that asks the user to pick a
// photo, but using
// FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET, ensures that
// relaunching
// the application from the device home screen does
// not return
// to the external activity.
// Intent externalActivityIntent = new Intent(
// Intent.ACTION_PICK);
// externalActivityIntent.setType("image/*");
// externalActivityIntent
// .addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
// startActivity(externalActivityIntent);
System.exit(0);
}
});
return rootView;
}
}
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the three primary sections of the app. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
AppSectionsPagerAdapter mAppSectionsPagerAdapter;
/**
* The {@link ViewPager} that will display the three primary sections of the
* app, one at a time.
*/
ViewPager mViewPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections
// of the app.
mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(
getSupportFragmentManager());
// Set up the action bar.
final ActionBar actionBar = getActionBar();
// Specify that the Home/Up button should not be enabled, since there is
// no hierarchical
// parent.
actionBar.setHomeButtonEnabled(false);
// Specify that we will be displaying tabs in the action bar.
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set up the ViewPager, attaching the adapter and setting up a listener
// for when the
// user swipes between sections.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mAppSectionsPagerAdapter);
mViewPager
.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// When swiping between different app sections, select
// the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if
// we have a reference to the
// Tab.
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
// Create a tab with text corresponding to the page title defined by
// the adapter.
// Also specify this Activity object, which implements the
// TabListener interface, as the
// listener for when this tab is selected.
actionBar.addTab(actionBar.newTab()
.setText(mAppSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
@Override
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
// When the given tab is selected, switch to the corresponding page in
// the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {
// TODO Auto-generated method stub
}
}
收藏演示活动
public class CollectionDemoActivity extends FragmentActivity {
/**
* A {@link android.support.v4.app.FragmentStatePagerAdapter} that returns a
* fragment representing an object in the collection.
*/
public static class DemoCollectionPagerAdapter extends
FragmentStatePagerAdapter {
public DemoCollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
// For this contrived example, we have a 10-object collection.
return 10;
}
@Override
public Fragment getItem(int i) {
Fragment fragment = new DemoObjectFragment();
Bundle args = new Bundle();
args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1); // Our object is
// just an
// integer :-P
fragment.setArguments(args);
return fragment;
}
@Override
public CharSequence getPageTitle(int position) {
return "Q. Set " + (position + 1);
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DemoObjectFragment extends Fragment {
public static final String ARG_OBJECT = "Question Set";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_collection_object, container, false);
Bundle args = getArguments();
((TextView) rootView.findViewById(android.R.id.text1))
.setText("Q.Set "
+ Integer.toString(args.getInt(ARG_OBJECT)));
return rootView;
}
}
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments representing each object in a collection. We use a
* {@link android.support.v4.app.FragmentStatePagerAdapter} derivative,
* which will destroy and re-create fragments as needed, saving and
* restoring their state in the process. This is important to conserve
* memory and is a best practice when allowing navigation between objects in
* a potentially large collection.
*/
DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
/**
* The {@link android.support.v4.view.ViewPager} that will display the
* object collection.
*/
ViewPager mViewPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_collection_demo);
// Create an adapter that when requested, will return a fragment
// representing an object in
// the collection.
//
// ViewPager and its adapters use support library fragments, so we must
// use
// getSupportFragmentManager.
mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(
getSupportFragmentManager());
// Set up action bar.
final ActionBar actionBar = getActionBar();
// Specify that the Home button should show an "Up" caret, indicating
// that touching the
// button will take the user one step up in the application's hierarchy.
actionBar.setDisplayHomeAsUpEnabled(true);
// Set up the ViewPager, attaching the adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mDemoCollectionPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This is called when the Home (Up) button is pressed in the action
// bar.
// Create a simple intent that starts the hierarchical parent
// activity and
// use NavUtils in the Support Package to ensure proper handling of
// Up.
Intent upIntent = new Intent(this, MainActivity.class);
if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
// This activity is not part of the application's task, so
// create a new task
// with a synthesized back stack.
TaskStackBuilder.from(this)
// If there are ancestor activities, they should be added here.
.addNextIntent(upIntent).startActivities();
finish();
} else {
// This activity is part of the application's task, so simply
// navigate up to the hierarchical parent activity.
NavUtils.navigateUpTo(this, upIntent);
}
return true;
case R.id.menuCancel:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
