片段：從活動中獲取對象（Tab View）

如何在此示例中訪問片段中的對象「selectedBox」？我在測試連接和片段的主要活動中需要它。片段：從活動中獲取對象（Tab View）

在我在main和fragment中創建它的那一刻。

MainActivity.java

public class MainActivity extends FragmentActivity implements ActionBar.TabListener{ 

    private ViewPager viewPager; 
    private ActionBar actionBar; 
    private MainTabAdapter mAdapter; 
    private String[] tabs = { "Live" }; 
    private box selectedBox; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     viewPager = (ViewPager) findViewById(R.id.pager); 
     actionBar = getActionBar(); 
     mAdapter = new MainTabAdapter(getSupportFragmentManager()); 
     viewPager.setAdapter(mAdapter); 
     actionBar.setHomeButtonEnabled(false); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 
     for (String tab_name : tabs) { 
      actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this)); 
     } 

     viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 
      @Override 
      public void onPageSelected(int position) { 
       actionBar.setSelectedNavigationItem(position); 
      } 
      @Override 
      public void onPageScrolled(int arg0, float arg1, int arg2) { 
      } 
      @Override 
      public void onPageScrollStateChanged(int arg0) { 
      } 
     }); 

     selectedBox = new box(this); 
    } 

    public void onResume(){ 
     super.onResume(); 
     if(selectedBox.getId() != -1){ 
      checkReachable(selectedBox.getIpPort()); 
     }else { 
      Intent intent = new Intent(this, SettingsActivity.class); 
      this.startActivity(intent); 
      finish(); 
     } 
    } 

    private void checkReachable(String ipPort) { 
     Log.d("XML Request", "CHECK BOX"); 
     String e2About = "http://" + ipPort + "/web/about"; 
     getXml.DownloadCompleteListener dcl = new getXml.DownloadCompleteListener() { 
      @Override 
      public void onDownloadComplete(String result) { 
       if (!result.contains("<e2enigmaversion>")) { 
        Toast.makeText(getApplicationContext(), "Active box not reachable.", Toast.LENGTH_SHORT).show(); 
        Intent intent = new Intent(getApplicationContext(), SettingsActivity.class); 
        startActivity(intent); 
       }else{ 
        viewPager.setAdapter(mAdapter); 
       } 
      } 
     }; 
     getXml downloader = new getXml(dcl); 
     downloader.execute(e2About); 
    } 


    @Override 
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) { 
    } 

    @Override 
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) { 
     viewPager.setCurrentItem(tab.getPosition()); 
    } 

    @Override 
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) { 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     int id = item.getItemId(); 
     switch (id){ 
      case R.id.action_settings: 
       Intent intent = new Intent(this, SettingsActivity.class); 
       startActivity(intent); 
       return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 
}

MainTabAdapter

public class MainTabAdapter extends FragmentPagerAdapter { 

    public MainTabAdapter(FragmentManager fm){ 
     super(fm); 
    } 
    @Override 
    public Fragment getItem(int index) { 
     switch (index) { 
      case 0: 
       return new MainFragmentLive(); 
     } 
     return null; 
    } 

    @Override 
    public int getCount() { 
     return 1; 
    } 
}

MainFragmentLive.java

public class MainFragmentLive extends ListFragment { 

    private box selectedBox; 

    private List<String> bouquetListString; 

    private ArrayAdapter<String> adapter; 

    @Override 
    public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment_main_live, container, false); 

     Log.d("Position", "Main Live Set Box"); 
     selectedBox = new box(getActivity()); 
     bouquetListString = selectedBox.getBouquets().get(2); 
     if(bouquetListString.size() < 1){ 
      getBouquetBox(); 
     } 
     adapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1, bouquetListString); 
     setListAdapter(adapter); 

     ImageButton reloadBouquet = (ImageButton) view.findViewById(R.id.reloadBouquet); 
     reloadBouquet.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View arg0) { 
       getBouquetBox(); 
      } 
     }); 

     setHasOptionsMenu(true); 
     return view; 
    } 


    public void onListItemClick(ListView l, View v, int position, long id) { 
     SharedPreferences savedData = getActivity().getSharedPreferences("box",0); 
     SharedPreferences.Editor editor = savedData.edit(); 
     editor.putInt("boId", position); 
     editor.apply(); 
     Intent gotoChannels = new Intent(getActivity(), ChannelListActivity.class); 
     startActivity(gotoChannels); 
    } 

    public void getBouquetBox(){ 
     getXml.DownloadCompleteListener dcl = new getXml.DownloadCompleteListener() { 
      @Override 
      public void onDownloadComplete(String result) { 
       selectedBox.delBouquets(); 
       bouquetListString.clear(); 
       String [] tags = {"e2servicereference", "e2servicename"}; 
       List<List<String>> bouquetsList = parseXml.parseXmlByTag(result, tags); 
       selectedBox.addBouquets(bouquetsList); 
       bouquetListString.addAll(selectedBox.getBouquets().get(2)); 
       adapter.notifyDataSetChanged(); 
      } 
     }; 
     Log.d("XML Request", "GET BOUQUET"); 
     getXml downloader = new getXml(dcl); 
     downloader.execute("http://" + selectedBox.getIpPort() + "/web/getservices"); 
    } 
}

activity_main.xml中

<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/pager" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
</android.support.v4.view.ViewPager>

個

fragment_main_live.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="horizontal" 
     android:layout_margin="8dp"> 
     <TextView 
      android:layout_width="0dip" 
      android:layout_height="wrap_content" 
      android:layout_weight="0.8" 
      android:text="@string/selectBouquet" 
      style="@style/header1"/> 
     <ImageButton 
      android:layout_width="0dip" 
      android:layout_height="wrap_content" 
      android:id="@+id/reloadBouquet" 
      android:src="@drawable/ic_action_refresh" 
      android:contentDescription="@string/search" 
      android:layout_weight=".20" 
      android:layout_gravity="bottom"/> 
    </LinearLayout> 
    <View 
     android:layout_width="fill_parent" 
     android:layout_height="1dp" 
     android:background="@android:color/darker_gray"/> 
    <ListView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@android:id/list" /> 
</LinearLayout>

來源

2014-09-29 Laire

我們可以看到你的xml嗎？ – 2014-09-29 21:39:58

我在上面添加了它 – Laire 2014-09-29 21:48:46

您需要從片段創建到活動的接口。喜歡的東西：

public class MainActivity extends FragmentActivity implements ActionBar.TabListener,MainFragment.getSelectedBox { 

private ViewPager viewPager; 
private ActionBar actionBar; 
private MainTabAdapter mAdapter; 
private String[] tabs = { "Live" }; 
private box selectedBox; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
.... 
} 

//called from the MainFragment 
@Override 
public void AccessSelectedBox { 
    this.box = <do something with box> 

} 

}

片段類

public class MainFragment extends ListFragment { 

//interface to the MainActivity activity class 
    private getSelectedBox listener; 

    public interface getSelectedBox { 
     public void AccessSelectedBox(); 

    } 

}

這裏是一個很好的文章：http://www.vogella.com/articles/AndroidFragments/article.html。

來源

2014-09-29 21:57:13

片段：從活動中獲取對象（Tab View）

回答

相關問題