在ViewPager中将一个片段replace为另一个片段

当我尝试用ViewPager另一个Fragmentreplace一个Fragment时，我遇到了一些问题。

现在的情况

我有一个3页的ViewPager ，每一个都是一个Fragment 。 在第一页，我有一个ListView内的ListFragment （“FacturasFragment”）。 当我点击该列表中的一个项目时，我使用onListItemClick方法来处理该事件。

我想要的是

• 单击列表项目时，我想用另一个Fragment （“DetallesFacturaFragment”，包含发票的详细信息）replaceListFragment （包含发票清单）。
• 当我在“DetallesFacturaFragment”，然后按返回Button ，应该返回到ListFragment 。
• 页面之间的滚动不应该改变第一个显示的Fragment 。 这是，如果我在第一页“DetallesFacturaFragment”和滚动到第二页，当返回到第一个应该继续显示“DetallesFacturaFragment”。

码

FragmentActivity

 public class TabsFacturasActivity extends SherlockFragmentActivity { private MyAdapter mAdapter; private ViewPager mPager; private PageIndicator mIndicator; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_pager); mAdapter = new MyAdapter(getSupportFragmentManager()); mPager = (ViewPager)findViewById(R.id.pager); mPager.setAdapter(mAdapter); mIndicator = (TitlePageIndicator)findViewById(R.id.indicator); mIndicator.setViewPager(mPager); } private static class MyAdapter extends FragmentPagerAdapter { private String[] titles = { "VER FACTURAS", "VER CONSUMO", "INTRODUCIR LECTURA" }; private final FragmentManager mFragmentManager; private Fragment mFragmentAtPos0; private Context context; public MyAdapter(FragmentManager fragmentManager) { super(fragmentManager); mFragmentManager = fragmentManager; } @Override public CharSequence getPageTitle(int position) { return titles[position]; } @Override public Fragment getItem(int position) { switch (position) { case 0: // Fragment # 0 return new FacturasFragment(); case 1: // Fragment # 1 return new ConsumoFragment(); case 2:// Fragment # 2 return new LecturaFragment(); } return null; } @Override public int getCount() { return titles.length; } @Override public int getItemPosition(Object object) { if (object instanceof FacturasFragment && mFragmentAtPos0 instanceof DetallesFacturaFragment) return POSITION_NONE; return POSITION_UNCHANGED; } } } 

ListFragment

 public class FacturasFragment extends ListFragment { private ListView lista; private ArrayList<TuplaFacturaWS> facturas; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.activity_facturas, container, false); facturas = myApplication.getFacturas(); lista = (ListView) view.findViewById(id.list); MyAdapter myAdaptador = new MyAdapter(this, facturas); setListAdapter(myAdaptador); return view; } public void onListItemClick (ListView l, View v, int position, long id) { myApplication.setFacturaActual(position); mostrarDatosFactura(); } private void mostrarDatosFactura() { final DetallesFacturaFragment fragment = new DetallesFacturaFragment(); FragmentTransaction transaction = null; transaction = getFragmentManager().beginTransaction(); transaction.replace(R.id.pager, fragment); //id of ViewPager transaction.addToBackStack(null); transaction.commit(); } private class MyAdapter extends BaseAdapter { private final FacturasFragment actividad; private final ArrayList<TuplaFacturaWS> facturas; public MyAdapter(FacturasFragment facturasActivity, ArrayList<TuplaFacturaWS> facturas) { super(); this.actividad = facturasActivity; this.facturas = facturas; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = actividad.getLayoutInflater(null); View view = inflater.inflate(R.layout.list_row, null, true); //Set data to view return view; } @Override public int getCount() { return facturas.size(); } @Override public Object getItem(int pos) { return facturas.get(pos); } @Override public long getItemId(int position) { return position; } private OnClickListener checkListener = new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }; } } 

分段

 public class DetallesFacturaFragment extends SherlockFragment { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); } public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.activity_factura, container, false); //Set data to view return view; } } 

目前，当我点击列表项时，白色视图出现在第一页。 我已经validation并执行了“DetallesFacturaFragment”的onCreateView方法，但没有任何内容出现在该页面上。

第一次点击列表项时，显示白屏。 但回到列表后，我必须点击两次显示白屏的列表项。

我一直在谷歌search，看着一些很多的问题，但找不到任何人用完成的代码解决。

Answer 1

经过这么多的时间，我发现正确的解决scheme修改代码中的答案 。

它用另一个ViewPager第一页replaceFragment ，如果从第二个Fragment返回，则第一个Fragment被正确显示。 首页中显示Fragment无关紧要，如果您从一个页面滑动到另一个页面，则不会更改其Fragment 。

这是我的代码：

FragmentActivity

 public class TabsFacturasActivity extends SherlockFragmentActivity { public void onBackPressed() { if(mPager.getCurrentItem() == 0) { if (mAdapter.getItem(0) instanceof DetallesFacturaFragment) { ((DetallesFacturaFragment) mAdapter.getItem(0)).backPressed(); } else if (mAdapter.getItem(0) instanceof FacturasFragment) { finish(); } } } private static class MyAdapter extends FragmentPagerAdapter { private final class FirstPageListener implements FirstPageFragmentListener { public void onSwitchToNextFragment() { mFragmentManager.beginTransaction().remove(mFragmentAtPos0) .commit(); if (mFragmentAtPos0 instanceof FacturasFragment){ mFragmentAtPos0 = new DetallesFacturaFragment(listener); }else{ // Instance of NextFragment mFragmentAtPos0 = new FacturasFragment(listener); } notifyDataSetChanged(); } } private String[] titles = { "VER FACTURAS", "VER CONSUMO", "INTRODUCIR LECTURA" }; private final FragmentManager mFragmentManager; public Fragment mFragmentAtPos0; private Context context; FirstPageListener listener = new FirstPageListener(); public MyAdapter(FragmentManager fragmentManager) { super(fragmentManager); mFragmentManager = fragmentManager; } @Override public CharSequence getPageTitle(int position) { return titles[position]; } @Override public Fragment getItem(int position) { switch (position) { case 0: // Fragment # 0 if (mFragmentAtPos0 == null) { mFragmentAtPos0 = new FacturasFragment(listener); } return mFragmentAtPos0; case 1: // Fragment # 1 return new ConsumoFragment(); case 2:// Fragment # 2 return new LecturaFragment(); } return null; } @Override public int getCount() { return titles.length; } @Override public int getItemPosition(Object object) { if (object instanceof FacturasFragment && mFragmentAtPos0 instanceof DetallesFacturaFragment) { return POSITION_NONE; } if (object instanceof DetallesFacturaFragment && mFragmentAtPos0 instanceof FacturasFragment) { return POSITION_NONE; } return POSITION_UNCHANGED; } } } 

FirstPageFragmentListener

 public interface FirstPageFragmentListener { void onSwitchToNextFragment(); } 

FacturasFragment （FirstFragment）

 public class FacturasFragment extends ListFragment implements FirstPageFragmentListener { static FirstPageFragmentListener firstPageListener; public FacturasFragment() { } public FacturasFragment(FirstPageFragmentListener listener) { firstPageListener = listener; } public void onListItemClick (ListView l, View v, int position, long id) { firstPageListener.onSwitchToNextFragment(); } } 

DetallesFacturaFragment （SecondFragment）

 public class DetallesFacturaFragment extends SherlockFragment { static FirstPageFragmentListener firstPageListener; public DetallesFacturaFragment() { } public DetallesFacturaFragment(FirstPageFragmentListener listener) { firstPageListener = listener; } public void backPressed() { firstPageListener.onSwitchToNextFragment(); } } 

Answer 2

解决Androidbuild议不要使用非默认构造函数的小问题。 你应该改变这样的构造函数：

在FacturasFragment：

  public static FacturasFragment createInstance(FirstPageFragmentListener listener) { FacturasFragment facturasFragment = new FacturasFragment(); facturasFragment.firstPageListener = listener; return facturasFragment; } 

然后你可以像这样从getItem函数调用它：

  mFragmentAtPos0 = FacturasFragment.createInstance(listener); 

在DetallesFacturaFragment：

  public static DetallesFacturaFragment createInstance(FirstPageFragmentListener listener) { DetallesFacturaFragment detallesFacturaFragment= new DetallesFacturaFragment(); detallesFacturaFragment.firstPageListener = listener; return detallesFacturaFragment; } 

然后你可以像这样从FirstPageListener.onSwitchToNextFragment（）函数调用它：

  mFragmentAtPos0 = DetallesFacturaFragment.createInstance(listener);