Daten in eine ExpandableListView laden

Question

Ich suche nach einem Weg, um Daten in eine Expandale List View zu laden, die Ausgabe möchte ich die der angehängten Bild ähneln here Um dies dynamisch zu tun, ist es besser zu sein von einem CSV lesen? Oder um eine DB zu erstellen? Außerdem möchte ich bei einem Unterpunkt drücken, dass eine ScrollView erscheint.

Hier ist der Code so weit: Das Layout der Aktivität:

<?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="wrap_content"> 

    <ExpandableListView 
     android:id= "@+id/android:list" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"/> 

     <TextView 
      android:id="@+id/android:empty" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      /> 
</LinearLayout> 

The itemlayout: 

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <TextView android:id="@+id/grp_child" 
     android:paddingLeft="50dp" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> 

</LinearLayout> 

Und die subitem:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <TextView android:id="@+id/row_name" 
     android:paddingLeft="50dp" 
     android:focusable="false" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"/> 
</LinearLayout> 

In der Tätigkeit habe ich bisher einige Werte fest einprogrammiert, einige mit Tutorials Ich stieß auf:

public void onCreate(Bundle savedInstanceState) { 
     try{ 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_photographers); 

      SimpleExpandableListAdapter expListAdapter = 
        new SimpleExpandableListAdapter(
          this, 
          createGroupList(),    
          R.layout.group_row,    
          new String[] { "Group Item" }, 
          new int[] { R.id.row_name },  
          createChildList(),    
          R.layout.child_row,    
          new String[] {"Sub Item"},  
          new int[] { R.id.grp_child}  
        ); 
      setListAdapter(expListAdapter); 
     }catch(Exception e){ 
      System.out.println("Errrr +++ " + e.getMessage()); 
     } 
    } 

    /* Creating the Hashmap for the row */ 

    @SuppressWarnings("unchecked") 
    private List createGroupList() { 
     ArrayList result = new ArrayList(); 
     for(int i = 0 ; i < 15 ; ++i) { // 15 groups........ 
      HashMap m = new HashMap(); 
      m.put("Group Item","Group Item " + i); // the key and it's value. 
      result.add(m); 
     } 
     return (List)result; 
    } 

    @SuppressWarnings("unchecked") 
    private List createChildList() { 
     ArrayList result = new ArrayList(); 
     for(int i = 0 ; i < 15 ; ++i) { // this -15 is the number of groups(Here it's fifteen) 
      /* each group need each HashMap-Here for each group we have 3 subgroups */ 
      ArrayList secList = new ArrayList(); 
      for(int n = 0 ; n < 3 ; n++) { 
       HashMap child = new HashMap(); 
       child.put("Sub Item", "Sub Item " + n); 
       secList.add(child); 
      } 
      result.add(secList); 
     } 
     return result; 
    } 


    public void onContentChanged () { 
     System.out.println("onContentChanged"); 
     super.onContentChanged(); 
    } 

    /* This function is called on each child click */ 
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,int childPosition,long id) { 
     System.out.println("Inside onChildClick at groupPosition = " + groupPosition +" Child clicked at position " + childPosition); 
     return true; 
    } 


    /* This function is called on expansion of the group */ 
    public void onGroupExpand (int groupPosition) { 
     try{ 
      System.out.println("Group expanding Listener => groupPosition = " + groupPosition); 
     }catch(Exception e){ 
      System.out.println(" groupPosition Errrr +++ " + e.getMessage()); 
     } 
    } 

Ich frage mich, ob es eine gute Idee ist Speichern Sie die Daten, die ich anzeigen möchte, in separaten CSV-Dateien (eine speichert die Daten für die Elemente, eine für die Unterelemente. eine für die zusätzlichen Informationen in der ScrollView), ID-s für die Identifizierung und zum direkten Lesen von den CSVs mit dem OpenCSVReader?

würde ich irgendwelche Ratschläge zu schätzen wissen, Dank

Answer 1

Adapter für Ihre erweiterbar Listview erstellen. wie die

public class ExpandableAdapter extends BaseExpandableListAdapter { 
    private final Context context; 
    private final List<Menu> parentObjects; 

    public ExpandableAdapter(Context context, ArrayList<Menu> parentObjects) { 
     this.context = context; 
     this.parentObjects = parentObjects; 

    } 

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

    @Override 
    public int getChildrenCount(int i) { 
     return parentObjects.get(i).childMenu.size(); 
    } 

    @Override 
    public Menu getGroup(int i) { 
     return parentObjects.get(i); 
    } 

    @Override 
    public Menu.ChildMenu getChild(int i, int i2) { 
     return parentObjects.get(i).childMenu.get(i2); 
    } 

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

    @Override 
    public long getChildId(int i, int i2) { 
     return 0; 
    } 

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

    @Override 
    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) { 
     Menu currentParent = parentObjects.get(i); 
     if (view == null) { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context 
        .LAYOUT_INFLATER_SERVICE); 
      view = inflater.inflate(R.layout.navdrawer_parent_item, viewGroup,false); 
     } 

     ImageView imageViewIndicator = (ImageView) view.findViewById(R.id.imageViewNav); 
     if (getChildrenCount(i) == 0) 
      imageViewIndicator.setVisibility(View.GONE); 
     else 
      imageViewIndicator.setVisibility(View.VISIBLE); 

     TextView textViewNavMenuName = (TextView) view.findViewById(R.id.textViewNavParentMenuName); 
     ImageView imageViewIcon = (ImageView) view.findViewById(R.id.imageViewIcon); 
     String base64 = currentParent.getImage(); 
     if (base64 != null && !base64.equals("")) { 
      byte[] imageAsBytes = Base64.decode(currentParent.getImage().getBytes(), Base64 
        .DEFAULT); 
      imageViewIcon.setImageBitmap(BitmapFactory.decodeByteArray(imageAsBytes, 0, 
        imageAsBytes.length)); 

     } else 
      imageViewIcon.setImageResource(R.drawable.ic_action_android); 

     textViewNavMenuName.setText(currentParent.getMenuName()); 
     return view; 
    } 



    @Override 
    public View getChildView(int groupPosition, int childPosition, boolean b, View view, 
          ViewGroup viewGroup) { 
     Menu currentChild = getGroup(groupPosition); 
     if (view == null) { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context 
        .LAYOUT_INFLATER_SERVICE); 
      view = inflater.inflate(R.layout.navdrawer_child_item, viewGroup,false); 
     } 
     View divider = view.findViewById(R.id.divider); 
     if (b) 
      divider.setVisibility(View.VISIBLE); 
     else 
      divider.setVisibility(View.GONE); 

     TextView textViewNavMenuName = (TextView) view.findViewById(R.id.textViewNavChildMenuName); 
     textViewNavMenuName.setText(currentChild.childMenu.get(childPosition).getMenuName()); 

     return view; 
    } 

    @Override 
    public boolean isChildSelectable(int i, int i2) { 
     return true; 
    } 
} 

und das Modell für die dehnbaren Listview wie

public class Menu { 
    private int AssociatedApp; 
    private String MenuName; 
    private String NavigateURL; 
    private String ActivityName; 
    private String Image; 
    private int MenuID; 
    public ArrayList<ChildMenu> childMenu; 

    public ArrayList<ChildMenu> getChildMenu() { 
     return childMenu; 
    } 

    public void setChildMenu(ArrayList<ChildMenu> childMenu) { 
     this.childMenu = childMenu; 
    } 

    public int getAssociatedApp() { 
     return AssociatedApp; 
    } 

    public void setAssociatedApp(int associatedApp) { 
     AssociatedApp = associatedApp; 
    } 

    public String getMenuName() { 
     return MenuName; 
    } 

    public void setMenuName(String menuName) { 
     MenuName = menuName; 
    } 

    public String getNavigateURL() { 
     return NavigateURL; 
    } 

    public void setNavigateURL(String navigateURL) { 
     NavigateURL = navigateURL; 
    } 

    public String getActivityName() { 
     return ActivityName; 
    } 

    public void setActivityName(String activityName) { 
     ActivityName = activityName; 
    } 

    public String getImage() { 
     return Image; 
    } 

    public void setImage(String image) { 
     Image = image; 
    } 


    public Menu() { 
    } 

    public int getMenuID() { 
     return MenuID; 
    } 

    public class ChildMenu { 
     private int AssociatedApp; 
     private String MenuName; 
     private String NavigateURL; 
     private String ActivityName; 
     private String Image; 
     private int MenuID; 
     public ChildMenu(String menuName, String activityName) { 
      this.MenuName = menuName; 
      this.ActivityName=activityName; 
     } 
     public ChildMenu() { 

     } 
     public int getAssociatedApp() { 
      return AssociatedApp; 
     } 

     public void setAssociatedApp(int associatedApp) { 
      AssociatedApp = associatedApp; 
     } 

     public String getMenuName() { 
      return MenuName; 
     } 

     public void setMenuName(String menuName) { 
      MenuName = menuName; 
     } 

     public String getNavigateURL() { 
      return NavigateURL; 
     } 

     public void setNavigateURL(String navigateURL) { 
      NavigateURL = navigateURL; 
     } 

     public String getActivityName() { 
      return ActivityName; 
     } 

     public void setActivityName(String activityName) { 
      ActivityName = activityName; 
     } 

     public String getImage() { 
      return Image; 
     } 

     public void setImage(String image) { 
      Image = image; 
     } 

     public int getMenuID() { 
      return MenuID; 
     } 
    } 

} 

ok jetzt Sie Ihr Menü mit Daten und bindwith erweiterbar Listenansicht

elv = (ExpandableListView)findViewById(R.id.elv); 
     elv.setOnGroupExpandListener(onGroupExpandListenser); 
     MyExpandableAdapter adapter = new MyExpandableAdapter(this, getData());//where getData() will return list of data. 
     elv.setAdapter(adapter); 

Eltern xml

<?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="wrap_content" 
       android:orientation="vertical"> 

    <RelativeLayout 
     android:layout_width="fill_parent" 
     android:layout_height="match_parent" 
     android:paddingBottom="12dp" 
     android:paddingLeft="12dp" 
     android:paddingTop="12dp"> 

     <ImageView 
      android:contentDescription="@string/app_name" 

      android:id="@+id/imageViewIcon" 
      android:layout_width="35dp" 
      android:layout_height="35dp" 
      android:layout_alignParentLeft="true" 
      android:layout_margin="4dp" 
      /> 

     <TextView 
      android:id="@+id/textViewNavParentMenuName" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_centerInParent="true" 
      android:layout_centerVertical="true" 
      android:layout_toLeftOf="@+id/imageViewNav" 
      android:layout_toRightOf="@+id/imageViewIcon" 
      android:padding="10dp" 
      android:textSize="15sp"/> 

     <ImageView 
      android:contentDescription="@string/app_name" 
      android:id="@+id/imageViewNav" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignParentRight="true" 
      android:layout_margin="4dp" 
      android:src="@drawable/ic_action_more_nav" 
      /> 
    </RelativeLayout> 

    <include 
     layout="@layout/divider" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent"/> 
</LinearLayout> 

erstellen

Kind xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:gravity="center_vertical" 

       android:orientation="vertical"> 

    <TextView 
     android:id="@+id/textViewNavChildMenuName" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="45dp" 
     android:gravity="center_vertical" 
     android:text="TextView" 
     android:padding="16dp"/> 

    <include 
     layout="@layout/divider" 
     android:layout_width="match_parent" 
     android:layout_height="fill_parent"/> 
</LinearLayout> 

Hinzufügen von Listener für erweiterbare ListView wie folgt. groupExpandlistener wird verwendet für collasping andere Gruppen während einer offenen

private int lastExpandedPosition = -1; 

zum Einrichten Zuhörer

elv.setOnChildClickListener(new DrawerItemClickListener()); 
     elv.setOnGroupClickListener(new DrawerItemClickListener()); 
     elv.setOnGroupExpandListener(new DrawerItemClickListener()); 

    private class DrawerItemClickListener implements ExpandableListView.OnChildClickListener, 
     ExpandableListView.OnGroupClickListener, ExpandableListView.OnGroupExpandListener { 
    @Override 
    public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int 
      childPosition, long id) { 
     selectItem(childPosition, navigationConfig.getBaseExpandableListAdapter 
       ().getChild 
       (groupPosition, childPosition)); 
     return true; 
    } 

    @Override 
    public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) { 

     selectItem(groupPosition, navigationConfig.getBaseExpandableListAdapter 
       ().getGroup 
       (groupPosition)); 
     return false; 
    } 

    @Override 
    public void onGroupExpand(int groupPosition) { 
     if (lastExpandedPosition != -1 
       && groupPosition != lastExpandedPosition) { 
      expandableListView.collapseGroup(lastExpandedPosition); 
     } 
     lastExpandedPosition = groupPosition; 
    } 
} 

für Abtastdaten mit getData zu binden(). note create Konstruktor in der Modellklasse wie in getData() angegeben

//Sample data for expandable list view. 
    public List<Menu> getData() 
    { 
     List<Menu> parentObjects = new ArrayList<Menu>(); 
     for (int i = 0; i<20; i++) 
     { 
      parentObjects.add(new Menu("Mother " +i, "Father " +i, "Header " + i, "Footer " +i, getChildren(i))); 

     } 
     return parentObjects; 
    } 

    private List<Menu.ChildMenu> getChildren(int childCount) 
    { 
     List<Menu.ChildMenu> childObjects = new ArrayList<Menu.ChildMenu>(); 
     for (int i =0; i<childCount; i++) 
     { 
      childObjects.add(new Menu.ChildMenu("Child " + (i+1), 10 +i)); 
     } 
     return childObjects; 
    }