我是 android 应用程序的初学者，我在 tab+swipe 应用程序上工作，我的主类就像 belove。请帮帮我。公共类 MainScreenViewActivity 扩展 FragmentActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. 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}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
private static String list_display_data1 = "item@sec1";
private static String list_display_data2 = "item@sec2";
private static String list_display_data3 = "item@sec3";
private static View rootView;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_screen_view);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
/*mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
@Override
public void onPageSelected(int position) {
super.onPageSelected(position);
// When swiping between pages, select the
// corresponding tab.
getActionBar().setSelectedNavigationItem(position);
}
});*/
}
@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_screen_view, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
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.
Fragment fragment = null;
fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(
R.layout.fragment_main_screen_view_dummy, container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
dummyTextView.setVisibility(View.INVISIBLE);
if(dummyTextView.getVisibility() == View.VISIBLE){
ListView sessionList = (ListView) rootView.findViewById(R.id.session_list);
initListView(getActivity(), sessionList, list_display_data1, 30, android.R.layout.simple_list_item_1);
}
else{
Log.d("", "");
}
//ListView sessionList = (ListView) rootView.findViewById(R.id.session_list);
//initListView(getActivity(), sessionList, list_display_data1, 30, android.R.layout.simple_list_item_1);
return rootView;
}
}
public static void initListView(Context context, ListView listView,String prefix, int numItems, int layout ){
// By using setAdpater method in listview we an add string array in list.
String[] arr = new String[numItems];
for(int i = 0; i< arr.length; i++){
arr[i] = prefix + (i +1);
}
listView.setAdapter(new ArrayAdapter<String>(context, layout, arr));
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Context context = view.getContext();
String msg = "item[" + position + "]= " + parent.getItemIdAtPosition(position);
Toast.makeText(context, msg, 1000).show();
System.out.println(msg);
}
});
}
}
在 dummySectionFragment 的 onCreateView 中如何添加不同的列表视图。我只能处理视图的可见性。