分段後臺不工作

-3

在我的MainActivity中，我添加了名爲FragmentA,FragmentB和FragmentC的三個標籤。分段後臺不工作

在FragmentA選項卡中，我通過列表片段填充聯繫人列表並將此片段添加到backstack。現在，當我點擊任何列表項時，它會在同一個標籤FragmentA下顯示該聯繫人的詳細片段。當我按下後退按鈕時，它會返回到聯繫人列表的片段。

關於詳細片段，而不是點擊後退按鈕，當我點擊FragmentB選項卡時，它應該顯示一個簡單的文本，它工作正常。但是當我點擊返回按鈕時，它應該關閉應用程序，但它回到列表片段，但仍然在FragmentB選項卡內，因此合併了這兩個片段。

在我MainActivity.java，

@Override 
    public void onTabSelected(Tab tab, FragmentTransaction ft) { 

if(tab.getPosition() == 0){ 
    PM_Fragment pm_Fragment= new PM_Fragment(); 
    FragmentManager manager= getFragmentManager(); 
    FragmentTransaction frgTrans = manager.beginTransaction(); 
    frgTrans.replace(android.R.id.content, pm_Fragment); 
    frgTrans.commit(); 
} 

else if(tab.getPosition() == 1){ 
    TabFragmentTwo tabFragmentTwo= new TabFragmentTwo(); 
    Bundle bundle = new Bundle(); 
    bundle.putString("Fragment", "2nd Fragment"); 

    tabFragmentTwo.setArguments(bundle); 
    FragmentManager manager= getFragmentManager(); 
    FragmentTransaction frgTrans = manager.beginTransaction(); 
    frgTrans.replace(android.R.id.content, tabFragmentTwo); 
    frgTrans.commit(); 
} 

else { 
    TabFragmentThree tabFragmentThree= new TabFragmentThree(); 
    Bundle bundle = new Bundle(); 

    bundle.putString("Fragment", "3rd Fragment"); 

    tabFragmentThree.setArguments(bundle); 
    FragmentManager manager= getFragmentManager(); 
    FragmentTransaction frgTrans = manager.beginTransaction(); 
    frgTrans.replace(android.R.id.content, tabFragmentThree); 
    frgTrans.commit(); 
    } 

}

PM_Fragment.java顯示的聯繫人列表。

package com.android.myactiobartabs; 
import android.app.ActionBar; 
import android.app.FragmentManager; 
import android.app.FragmentTransaction; 
import android.app.ListFragment; 
import android.app.LoaderManager; 
import android.content.CursorLoader; 
import android.content.Intent; 
import android.content.Loader; 
import android.database.Cursor; 
import android.graphics.Color; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.ContactsContract; 
import android.provider.ContactsContract.Contacts; 
import android.text.TextUtils; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.EditText; 
import android.widget.ListView; 
import android.widget.SearchView; 
import android.widget.SearchView.OnQueryTextListener; 
import android.widget.SimpleCursorAdapter; 
import android.widget.Toast; 

public class PM_Fragment extends ListFragment 
         implements OnQueryTextListener , LoaderManager.LoaderCallbacks<Cursor>{ 
    String mCurFilter; 
    SimpleCursorAdapter mAdapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setHasOptionsMenu(true); 

     ActionBar actionBar = getActivity().getActionBar(); 
//  actionBar.setDisplayHomeAsUpEnabled(false); 
     MenuButtonUtil.enableMenuButton(getActivity()); 

    } 
    @Override 
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.activity_list_view_with_simple_adapter, container,false); 

     mAdapter = new SimpleCursorAdapter(getActivity(), 
       R.layout.pm_fragment, null, 
       new String[] {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER}, 
       new int[] { R.id.textView1, R.id.textView2 }, 0); 
     setListAdapter(mAdapter); 

     getLoaderManager().initLoader(0, null, this); 

     return rootView; 
    } 

    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 

     inflater.inflate(R.menu.pm_fragment_actionitems, menu); 
     MenuItem searchItem = menu.findItem(R.id.pm_action_search); 
     SearchView sv = new SearchView(getActivity()); 
    // Changing the color of Searchview widget text field to white.  
     int searchSrcTextId = getResources().getIdentifier("android:id/search_src_text", null, null); 
     EditText searchEditText = (EditText) sv.findViewById(searchSrcTextId); 
     searchEditText.setTextColor(Color.WHITE); 

     sv.setOnQueryTextListener(this); 
     searchItem.setActionView(sv); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     switch (item.getItemId()) { 
     case R.id.pm_action_delete: 
      Toast.makeText(getActivity(),"Text_DELETE!",Toast.LENGTH_SHORT).show(); 
      return true; 
     case R.id.pm_action_edit: 
      Toast.makeText(getActivity(),"Text_EDIT!",Toast.LENGTH_SHORT).show(); 
      return true; 
     case R.id.pm_action_add_person: 
      final Intent intent = new Intent(Intent.ACTION_INSERT, Contacts.CONTENT_URI); 
      startActivity(intent); 
      return true; 
     case R.id.pm_action_refresh: 
      Toast.makeText(getActivity(),"Text_REFRESH!",Toast.LENGTH_SHORT).show(); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 
    } 

    @Override 
    public void onListItemClick(ListView l, View v, int position, long id) { 

     getListView().setItemChecked(position, true); 

     DetailsFragment detailsFragment = new DetailsFragment(); 

     Cursor mycursor = (Cursor) getListView().getItemAtPosition(position); 
     System.out.println("mycursor.getString(1) " + mycursor.getString(2) +" "); 

     Bundle bundle = new Bundle(); 
     bundle.putString("CONTACT_NAME", mycursor.getString(1)); 
     bundle.putString("CONTACT_NUMBER", mycursor.getString(2)); 

     detailsFragment.setArguments(bundle); 
     FragmentManager manager= getActivity().getFragmentManager(); 
     FragmentTransaction frgTrans = manager.beginTransaction(); 
     frgTrans.replace(android.R.id.content, detailsFragment); 
     frgTrans.addToBackStack("pm_fragment"); 
     frgTrans.commit(); 
    } 

    @Override 
    public boolean onQueryTextChange(String newText) { 
     mCurFilter = !TextUtils.isEmpty(newText) ? newText : null; 
     getLoaderManager().restartLoader(0, null, this); 
     return true; 
    } 

    @Override 
    public Loader<Cursor> onCreateLoader(int id, Bundle args) { 

     System.out.println("The value of Filter is : "+mCurFilter); 
     // Run query 
     Uri baseUri; 

     if (mCurFilter != null) { 
      baseUri = Uri.withAppendedPath(ContactsContract.CommonDataKinds.Phone.CONTENT_FILTER_URI, 
        Uri.encode(mCurFilter)); 
     } else { 
      baseUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI; 
     } 

     String[] projection = new String[] { 
       ContactsContract.CommonDataKinds.Phone._ID, 
       ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME, 
       ContactsContract.CommonDataKinds.Phone.NUMBER, 
       }; 

     String selection = "((" + 
       ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " NOTNULL) AND (" + 
       ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " != ''))"; 
     String[] selectionArgs = null; 
     String sortOrder = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " COLLATE LOCALIZED ASC"; 

     return new CursorLoader(getActivity(), baseUri, projection, selection, selectionArgs, sortOrder); 
    } 

    @Override 
    public void onLoadFinished(Loader<Cursor> arg0, Cursor data) { 
     mAdapter.swapCursor(data); 
    } 

    @Override 
    public void onLoaderReset(Loader<Cursor> arg0) { 
     // TODO Auto-generated method stub 
     mAdapter.swapCursor(null);  
    } 

    @Override 
    public boolean onQueryTextSubmit(String query) { 
     // TODO Auto-generated method stub 
     return false; 
    } 

}

DetailsFragment.java顯示點擊列表項的細節：

package com.android.myactiobartabs; 

import android.app.ActionBar; 
import android.app.Fragment; 
import android.content.Intent; 
import android.os.Bundle; 
import android.provider.ContactsContract.Contacts; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 
import android.widget.Toast; 

public class DetailsFragment extends Fragment { 
    TextView textDetail1; 
    TextView textDetail2; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setHasOptionsMenu(true); 

     //Get ActionBar and navigate UP 
     ActionBar actionBar = getActivity().getActionBar(); 
     //  MenuButtonUtil.enableMenuButton(getActivity()); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 

     View view = inflater.inflate(R.layout.details_fragment, container, false); 

     textDetail1 = (TextView)view.findViewById(R.id.textDetail1); 
     textDetail2 = (TextView)view.findViewById(R.id.textDetail2); 

     Bundle bundle = getArguments(); 
     if(bundle != null){ 
      String name = bundle.getString("CONTACT_NAME"); 
      String number = bundle.getString("CONTACT_NUMBER"); 
      textDetail1.setText(""+number); 
      textDetail2.setText(""+name); 
     } 

     //  getFragmentManager().popBackStack(); 

     return view; 
    } 


    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 

     inflater.inflate(R.menu.details_fragment_actionitems, menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     switch (item.getItemId()) { 

     /*case android.R.id.home: 

      FragmentManager manager= getActivity().getFragmentManager(); 
      manager.popBackStack("pm_fragment", FragmentManager.POP_BACK_STACK_INCLUSIVE); 
      FragmentTransaction frgTrans = manager.beginTransaction(); 
      frgTrans.commit(); 
      getActivity().getActionBar().setDisplayHomeAsUpEnabled(false); 
      getActivity().getActionBar().setHomeButtonEnabled(false); 

      return true; 
     */ 
     case R.id.dt_action_search: 
      Toast.makeText(getActivity(),"Text_SEARCH!",Toast.LENGTH_SHORT).show(); 
      return true; 
     case R.id.dt_action_delete: 
      Toast.makeText(getActivity(),"Text_DELETE!",Toast.LENGTH_SHORT).show(); 
      return true; 
     case R.id.dt_action_edit: 
      Toast.makeText(getActivity(),"Text_EDIT!",Toast.LENGTH_SHORT).show(); 
      return true; 
     case R.id.dt_action_add_person: 
      final Intent intent = new Intent(Intent.ACTION_INSERT, Contacts.CONTENT_URI); 
      startActivity(intent); 
      return true; 
     default: 
      return super.onOptionsItemSelected(item); 
     } 
    }  

}

TagFragmentTwo.java顯示上點擊FragmentB標籤簡單的txt。

package com.android.myactiobartabs; 

import android.app.ActionBar; 
import android.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuInflater; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 


public class TabFragmentTwo extends Fragment{ 


     TextView textDetail; 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setHasOptionsMenu(true); 

      ActionBar actionBar = getActivity().getActionBar(); 

     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 


      View view = inflater.inflate(R.layout.tab_fragment, container, false); 

      textDetail = (TextView)view.findViewById(R.id.simpleTxt); 

      Bundle bundle = getArguments(); 
      if(bundle != null){ 
       String simpleTxt = bundle.getString("Fragment"); 
       textDetail.setText(""+simpleTxt); 
      } 

      return view; 
     } 


     @Override 
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
     // TODO Auto-generated method stub 
     super.onCreateOptionsMenu(menu, inflater); 
     } 

     @Override 
     public boolean onOptionsItemSelected(MenuItem item) { 
     // TODO Auto-generated method stub 
     return super.onOptionsItemSelected(item); 
     } 

    }

來源

2014-05-13 BST Kaal

沒有它不是，男處理應用程序與片段不活動。在單擊每個選項卡時，它會使用「MainActivity」的用戶界面打開一個新的片段，並且沒有任何內容像fragments的「onBackPressed」。 –

顯示從fragmentA切換到fragmentB的代碼。我建議您在單擊2DFragment或3D Fragment時清除片段的後臺堆棧。在該點擊事件時，首先彈出碎片的後臺堆棧，然後加載新的碎片。它肯定會起作用。 – GrIsHu

是的，那就是我正在等待的...... Thnx @GrlsHu，只是掛了一分鐘，包括我在我的帖子中的代碼。 –

我建議您清除碎片的堆棧中，只要你點擊2DFragment或3D片段。在該點擊事件時，首先彈出碎片的後臺堆棧，然後加載新的碎片。它肯定會起作用。

在加載新片段之前，單擊您的選項卡上的以下代碼。

  FragmentManager fm = getSupportFragmentManager(); 
      FragmentTransaction ft = fm.beginTransaction(); 
      fm.popBackStack();

編輯：

更改密碼在你MainActivity如下：

else if(tab.getPosition() == 1){ 

    FragmentManager manager= getFragmentManager(); 
    FragmentTransaction frgTrans = manager.beginTransaction(); 
    manager.popBackStack(); 

     TabFragmentTwo tabFragmentTwo= new TabFragmentTwo(); 
    Bundle bundle = new Bundle(); 
    bundle.putString("Fragment", "2nd Fragment"); 

    tabFragmentTwo.setArguments(bundle); 
    frgTrans.replace(android.R.id.content, tabFragmentTwo); 
    frgTrans.commit(); 
} 

else { 
    FragmentManager manager= getFragmentManager(); 
    FragmentTransaction frgTrans = manager.beginTransaction(); 
    manager.popBackStack(); 
    TabFragmentThree tabFragmentThree= new TabFragmentThree(); 
    Bundle bundle = new Bundle(); 
    bundle.putString("Fragment", "3rd Fragment"); 

    tabFragmentThree.setArguments(bundle); 

    frgTrans.replace(android.R.id.content, tabFragmentThree); 
    frgTrans.commit(); 
    }

來源

2014-05-13 09:23:16 GrIsHu

OMG ...它就像一個魅力... thnx很多...我不知道爲什麼其他人分級下我的問題三次... –

分段後臺不工作

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