我使用Eclipse向导使用ActionBar和制表符创建了一个活动。我想在我的三个选项卡中显示ListViews，但是当我运行我的应用程序时它们没有显示。
使用标签的活动代码：
public class CreateProjectManually extends FragmentActivity implements ActionBar.TabListener {
/**
* 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;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_project_manually);
// 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 action bar.
final ActionBar actionBar = getActionBar();
// set the app icon as an action to go home
actionBar.setDisplayHomeAsUpEnabled(true);
//enable tabs in actionbar
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
// When swiping between different sections, select the corresponding tab.
// We can also use ActionBar.Tab#select() to do this if we have a reference to the
// Tab.
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
// For each of the sections in the app, add a tab to the action bar.
for (int i = 0; i < mSectionsPagerAdapter.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(mSectionsPagerAdapter.getPageTitle(i))
.setTabListener(this));
}
}
/**
* Actionbar
* */
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_save:
//TODO Speichern implementieren
Toast.makeText(getBaseContext(), "Speichern",Toast.LENGTH_LONG).show();
break;
case android.R.id.home:
// app icon in action bar clicked; go home
Intent intent = new Intent(this, ProjectList.class);
intent.putExtra("Uniqid","From_CreateProjectManually_Activity");
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
return true;
default:
break;
}
return true;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_create_project_manually, menu);
return true;
}
@Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
@Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
// When the given tab is selected, switch to the corresponding page in the ViewPager.
mViewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary
* sections of the app.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int i) {
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, i + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0: return getString(R.string.building).toUpperCase();
case 1: return getString(R.string.room).toUpperCase();
case 2: return getString(R.string.devices).toUpperCase();
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
public DummySectionFragment() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return (LinearLayout) inflater.inflate(R.layout.listviews, container, false);
}
}
}
使用ListView的布局的XML文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="259dp" >
</ListView>
</LinearLayout>
</LinearLayout>
显示TextView但不显示ListView。有什么问题？
答案 0 :(得分：0)
首先，您必须为列表视图创建适配器，您可以使用它自己的自定义行，并根据根视图在onCreateView方法中找到它的ID，如下所示：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_calendar_dummy,
container, false);
/*TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)) + "HOLA");*/
//getFavorito(ARG_SECTION_NUMBER);
//asyncFavorite().execute(ARG_SECTION_NUMBER);
lista = (ListView) rootView.findViewById(R.id.Your own list);
loadingLista = (RelativeLayout) rootView.findViewById(R.id.loadingLista);
int mes = getArguments().getInt(ARG_SECTION_NUMBER);
new asyncFavorite().execute(Integer.toString(mes));
Log.i("mfb", "puse el-----------------" + Integer.toString(mes));
return rootView;
}
在此之后你必须创建一个方法来扩充你的列表，创建一个包含列表所有元素的对象的数组列表，并使用它来给所有行充气：
m_orders = new ArrayList<Order>();
//JSONObject data = new JSONObject(Fetcher.getMonthBirthday(FBAccount, params[0]));
//resData = data.getJSONArray("data");
//Log.i("mfb", "RESDATA::::::::::" + resData + "////////////////////" +Index.userID);
JSONObject objeto = null;
String nombre = "";
String cumpliendo = "";
String mes = "";
String dia = "";
String uuid = "";
String favorite = "";
String ownerID = "";
int mesNumero = 0;
String[] cumple = null;
String pasoMes = "";
for(int i = 0; i<resData.length(); i++){
objeto = resData.getJSONObject(i);
nombre = objeto.getString("name");
cumpliendo = objeto.getString("edad");
cumple = objeto.getString("birthday").split("-");
dia = cumple[2];
pasoMes = cumple[1];
mesNumero = Integer.parseInt(pasoMes);
//mes = getMes(mesNumero);
uuid = objeto.getString("uuid");
favorite = "1";
ownerID = objeto.getString("user_id");
m_orders.add(i, new Order(""+nombre, ""+cumpliendo, ""+mes, ""+dia, "" + uuid, ""+favorite, ""+ownerID, "" + FBAccount));
//Log.i("mfb", "HH " + nombre);
}
您必须将适配器设置为列表
runOnUiThread(new Runnable() {
@Override
public void run() {
try {
Log.v("mfb", " Runnable "+m_orders.size());
adapterOrder = new orderItemAdapter(activity.getApplicationContext(), android.R.layout.simple_list_item_1, m_orders);
lista.setAdapter(adapterOrder);
adapterOrder.notifyDataSetChanged();
}catch (NullPointerException e){
Log.e("Error", " generateAdapter NullPointerException ERROR => "+e.getMessage());
}catch (Exception e) {
// TODO: handle exception
Log.e("Error", " generateAdapter Exception ERROR => "+e.getMessage());
}
}
});
适配器是这样的：
public class orderItemAdapter extends ArrayAdapter<Order>{
public ArrayList<Order> orders;
LayoutInflater inflater = null;
public orderItemAdapter(Context context, int textViewResourceId, ArrayList<Order> orders){
super(context, textViewResourceId, orders);
this.orders = orders;
Log.v("mfb", "orderItem "+this.orders.size());
}
public void add(int index, Order order){
this.orders.add(index, order);
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
View vi=convertView;
LayoutInflater inflater = null;
if(convertView==null){
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vi = inflater.inflate(R.layout.list_user, null);
}
Order order = orders.get(position);
if(order != null){
TextView nombre = (TextView)vi.findViewById(R.id.nombre);
TextView edadCumplir = (TextView)vi.findViewById(R.id.edadCumplir);
//TextView mes = (TextView)vi.findViewById(R.id.mes);
TextView dia = (TextView)vi.findViewById(R.id.dia);
//Log.v("mfb", " order position => "+position);
if(nombre != null){
nombre.setText(orders.get(position).getNombre());
//Log.v("mfb", "orderItemAdapter nombre =>" + nombre.getText());
}
if(edadCumplir != null){
edadCumplir.setText("Turning " + orders.get(position).getCumpliendo());
}
/*if(mes != null){
mes.setText(orders.get(position).getMes());
}*/
if(dia != null){
dia.setText(orders.get(position).getDia());
}
}
return vi;
}
}