Viewpager，光标和片段

我是viewpager的新手，想知道是否有人可以将我指向使用带有片段和数据库的viewpager的项目的教程或源代码。我见过的PagerAdapters的例子，但我只是没有得到他们如何一起工作（光标，片段和PagerAdapter）Viewpager，光标和片段

在此先感谢。

来源

2014-03-04 Michael Little

请继续阅读：[http://stackoverflow.com/questions/12737222/viewpager-and-database](http://stackoverflow.com/questions/12737222/viewpager-and-database） –

谢谢，但那doesn回答我的问题。 –

然后你plz详细写你想做什么？ –

我已经在与您的问题相关的其他帖子中发布了一些答案。

下面是一些您可能会发现有帮助的链接。

第一链接：在每一页幻灯片中获得自定义视图。（接受的答案）

Android:How to create different view in ViewPager?

二：如何正确使用片段，ViewPager。（接受的答案）

How to properly use fragments with ViewPager?

如果这两个环节是不是有用，试试这个：

public class AllActivities extends FragmentActivity implements ActionBar.TabListener { 

    public ViewPager viewPager; 
    private AllPagesAdapter mAdapter; 
    private ActionBar actionBar; 
    private String [] tabs = {"Android","CoreJava","J2EE","Database","Web Services"}; 

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

     //Initializing all stuff 
     viewPager = (ViewPager)findViewById(R.id.pager); 

     actionBar = getActionBar(); 
     mAdapter = new AllPagesAdapter(getSupportFragmentManager()); 
     viewPager.setAdapter(mAdapter); 
     actionBar.setHomeButtonEnabled(true); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 



     //Add the tabs here 
     for(String tab_name:tabs){ 
      actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this)); 
     } 

     viewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){ 

      @Override 
     public void onPageSelected(int position){ 

       //on Page change, that particular page should be selected 
       actionBar.setSelectedNavigationItem(position); 
      } 

      @Override 
       public void onPageScrolled(int arg0,float arg1,int arg2){ 

      } 
      @Override 
     public void onPageScrollStateChanged(int 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, menu); 
     return true; 
    } 

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

     viewPager.setCurrentItem(tab.getPosition()); 
    } 

    @Override 
    public void onTabUnselected(Tab tab, FragmentTransaction fragmentTransaction) { 



    } 

    @Override 
    public void onTabReselected(Tab tab, FragmentTransaction fragmentTransaction) { 

     viewPager.setCurrentItem(tab.getPosition()); 

    } 
} 

//This is one of the fragment and assume that Expandablelistview is your list view.. In both the cases, i am setting the adapter in the onActivityCreated() method. 
public class Android extends android.support.v4.app.Fragment { 



    ExpandableListAdapter listAdapter; 
    // private ExpandableListView expListView; 
    List<String> listDataHeader; 
    HashMap<String, List<String>> listDataChild; 
    ListView lv1; 
    private static final String QUESTION = "question"; 
    private static final String ANSWERS = "answer"; 


    // ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>(); 

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


     View mikeview = inflater.inflate(R.layout.androidlayout, container, false); 

     return mikeview; 

    } 



    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 


     ExpandableListView expListView = null; 
     try{ 
      expListView = (ExpandableListView) getActivity().findViewById(R.id.androidExpandableList); 
      } 
     catch (Exception e){ 

      e.printStackTrace(); 
     } 




     new Thread(){ 


      @Override 
      public void run(){ 



      } 
     }.start(); 

     try { 
      setParent(); 
      prepareChild(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 




     ExpandableListAdapter listAdapter = new ExpandableListAdapter(getActivity(), listDataHeader, listDataChild); 
     expListView.setAdapter(listAdapter); 




     // Listview on child click listener 
     expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { 

      @Override 
      public boolean onChildClick(ExpandableListView parent, View v, 
             int groupPosition, int childPosition, long id) { 
       /*Toast.makeText(
         getActivity(), 
         listDataHeader.get(groupPosition) 
           + " : " 
           + listDataChild.get(
           listDataHeader.get(groupPosition)).get(
           childPosition), Toast.LENGTH_SHORT) 
         .show();*/ 
       return true; 
      } 
     }); 


     // Listview Group expanded listener 
     expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() { 

      @Override 
      public void onGroupExpand(int groupPosition) { 
       /* Toast.makeText(getActivity(), 
         listDataHeader.get(groupPosition) + " Expanded", 
         Toast.LENGTH_SHORT).show();*/ 
      } 
     }); 

     // Listview Group collasped listener 
     expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() { 

      @Override 
      public void onGroupCollapse(int groupPosition) { 
       /*Toast.makeText(getActivity(), 
         listDataHeader.get(groupPosition) + " Collapsed", 
         Toast.LENGTH_SHORT).show();*/ 

      } 
     }); 


    } 


    public void setParent(){ 

     listDataHeader = new ArrayList<String>(); 

     try{ 

      JSONObject json = new JSONObject(loadJSONFromAsset()); 

      JSONArray array = json.getJSONArray("androidquestion"); 

      for(int my =0;my<array.length();my++){ 

       JSONObject c = array.getJSONObject(my); 


       String topics = c.getString(QUESTION); 
       listDataHeader.add(topics); 
      } 
     } 

     catch (JSONException e) { 

      e.printStackTrace(); 

     } 

    } 

    public void prepareChild() throws JSONException { 

     listDataChild = new HashMap<String, List<String>>(); 

     try{ 

      JSONObject json = new JSONObject(loadJSONFromAsset()); 
      JSONArray array = json.getJSONArray("androidquestion"); 
      for(int mz = 0;mz<array.length();mz++){ 

       ArrayList<String> child = new ArrayList<String>(); 
       JSONObject d = array.getJSONObject(mz); 
       String ans = d.getString(ANSWERS); 
       child = new ArrayList<String>(); 

       child.add(ans); 
       int position = mz ; 

       listDataChild.put(listDataHeader.get(position),child); 

      } 
     } 
     catch(JSONException e) { 
      e.printStackTrace(); 

     } 

    } 


    public String loadJSONFromAsset() { 

     String json = null; 

     try { 

      InputStream is = getActivity().getAssets().open("android.json"); 

      int size = is.available(); 

      byte[] buffer = new byte[size]; 

      is.read(buffer); 

      is.close(); 

      json = new String(buffer, "UTF-8"); 

     } catch (IOException ex) { 

      ex.printStackTrace(); 

      return null; 
     } 
     return json; 

    } 

} 

    //This is the adapter. 
    public class AllPagesAdapter extends FragmentStatePagerAdapter { 



      public AllPagesAdapter(FragmentManager fm) { 

       super(fm); 

      } 

      @Override 
      public Fragment getItem(int index) { 

     switch (index) { 
      case 0: 

       return new Android(); 

      case 1: 

       return new CoreJava(); 
      case 2: 

       return new J2EE(); 

      case 3: 

       return new Database(); 

      case 4: 

       return new WebServices(); 


     } 
     return null; 


    } 

    @Override 
    public int getCount() { 
     return 5; 
    } 

} 

//This is the adapter for my expandable list view.. in your case, your can just use the listadapter or any other adapter you want to use. This is just an optional part. 
public class ExpandableListAdapter extends BaseExpandableListAdapter { 

    private Context _context; 
    private List<String> _listDataHeader; // header titles 
    // child data in format of header title, child title 
    private HashMap<String, List<String>> _listDataChild; 


    public ExpandableListAdapter(Context context, List<String> listDataHeader, 
           HashMap<String, List<String>> listChildData) { 
     this._context = context; 
     this._listDataHeader = listDataHeader; 
     this._listDataChild = listChildData; 
    } 

    @Override 
    public Object getChild(int groupPosition, int childPosititon) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .get(childPosititon); 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public View getChildView(int groupPosition, final int childPosition, 
          boolean isLastChild, View convertView, ViewGroup parent) { 

     final String childText = (String) getChild(groupPosition, childPosition); 

     if (convertView == null) { 
      LayoutInflater inflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.newlistitems,null); 

     } 

     TextView txtListChild = (TextView) convertView 
       .findViewById(R.id.newlistviewitems); 

     txtListChild.setText(childText); 
     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)) 
       .size(); 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return this._listDataHeader.get(groupPosition); 
    } 

    @Override 
    public int getGroupCount() { 
     return this._listDataHeader.size(); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, 
          View convertView, ViewGroup parent) { 
     String headerTitle = (String) getGroup(groupPosition); 
     if (convertView == null) { 
      LayoutInflater myInflater = (LayoutInflater) this._context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = myInflater.inflate(R.layout.newlistgroup, null); 
     } 

     TextView lblListHeader = (TextView) convertView 
       .findViewById(R.id.newlistviewgroup); 
     lblListHeader.setTypeface(null, Typeface.BOLD); 
     lblListHeader.setText(headerTitle); 

     return convertView; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return false; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return true; 
    } 
}

还是让我知道，如果你需要的是更多的例子.. :)

来源

2014-03-04 16:45:36 mike20132013

谢谢。我今天晚些时候会看看。欣赏的帮助 –

没有prob ..高兴我能够帮助.. :) – mike20132013

Viewpager，光标和片段

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