Verschiedene untergeordnete Layouts für verschiedene Gruppen ExpandableListView

Question

Ich habe Probleme, dies zu versuchen. Ich kann es anscheinend nicht richtig machen, ich möchte jeden Elternteil + Kinder dieses Elternteils kontrollieren. ExpandableListView hat mir Kopfschmerzen bereitet. Paketkommentare;

public class CommentsExpandableListAdapter extends BaseExpandableListAdapter { 

private Activity context; 
private Map<String, List<String>> comments_feed_collection; 
private List<String> group_list; 



private boolean a_comment = false; 
public CommentsExpandableListAdapter(Activity context, List<String> group_list, 
          Map<String, List<String>> comments_feed_collection) { 
    this.context = context; 
    this.comments_feed_collection = comments_feed_collection; 
    this.group_list = group_list; 
} 


public Object getChild(int groupPosition, int childPosition) { 
    return comments_feed_collection.get(group_list.get(groupPosition)).get(childPosition); 
} 

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

public View getChildView(final int groupPosition, final int childPosition, 
         boolean isLastChild, View convertView, ViewGroup parent) { 
    final String incoming_text = (String) getChild(groupPosition, childPosition); 
    LayoutInflater inflater = context.getLayoutInflater(); 


    if (convertView == null) { 
     //first view 
     if(childPosition==0 && groupPosition==0) { 
      convertView = inflater.inflate(R.layout.description_of_ads_expandable_list, null); 
      TextView description_child = (TextView) convertView.findViewById(R.id.description_of_ads_expandable_list_child_text_view); 
      description_child.setText(incoming_text); 
     }else if(childPosition==0 && groupPosition==1){ 
      //second view view 
      convertView = inflater.inflate(R.layout.comments_create_comment, null); 
     }else if(childPosition>=1 && groupPosition>=1){ 
      //thrid view 
      convertView = inflater.inflate(R.layout.comments_expandable_list_child, null); 
     } 
    } 
    return convertView; 
} 

public int getChildrenCount(int groupPosition) { 
    return comments_feed_collection.get(group_list.get(groupPosition)).size(); 
} 

public Object getGroup(int groupPosition) { 
    return group_list.get(groupPosition); 
} 
public int getGroupCount() { 
    return group_list.size(); 
} 

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


public View getGroupView(int groupPosition, boolean isExpanded, 
         View convertView, ViewGroup parent) { 
    String incoming_text = (String) getGroup(groupPosition); 
    if (convertView == null) { 
     LayoutInflater infalInflater = (LayoutInflater) context 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = infalInflater.inflate(R.layout.expandable_list_single_item, 
       null); 
    } 
    TextView item = (TextView) convertView.findViewById(R.id.expandable_list_single_item_text_view_group); 
    item.setTypeface(null, Typeface.BOLD); 
    item.setText(incoming_text); 
    return convertView; 
} 


public boolean hasStableIds() { 
    return true; 
} 


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


@Override 
public int getChildTypeCount() { 
    return 3; 
} 

@Override 
public int getGroupType(int groupPosition) { 
    return super.getGroupType(groupPosition); 
} 

@Override 
public int getGroupTypeCount() { 
    return 3; 
} 
} 

Answer 1

Ich denke, Ihr Hauptfehler in public View getChildView(...) wohnt: eigentlich nur einmal erreicht ist

• Die Bedingung if (convertView == null) und das ist, wenn Sie die, die Sie als erster Blick markiert laden. Sie füllen also das erste Layout R.layout.description_of_ads_expandable_list auf und verwenden es für alle anderen Zeilen in Ihrer Liste.
• Die Art, in der Sie nach dem Typ der zu ladenden untergeordneten Ansicht suchen, ist gefährlich, da sie unvollständig ist. Was denkst du wird passieren, wenn childPosition==1 && groupPosition==0? Booom! NullPointerException, wenn Ihre Datenquelle ein Element mehr für die erste Gruppe enthält.

Also erste Dinge zuerst; Sie sollten HeterogeneousExpandableList interface vollständig implementieren, wenn Sie unterschiedliche Layouts für verschiedene Gruppen/untergeordnete Elemente Ihrer ExpandableListView verwenden möchten.

Dann mit dieser Schnittstelle arbeiten die Bedingungen, von denen Layout geladen werden soll.

Schließlich arbeiten Sie an der Wiederverwendung Ansicht Problem auf public View getChildView(...).

Da ein netter Kerl bin hier ist aa Schnipsel, die Sie (basierend auf dem Adapter, den Sie schreiben) helfen sollte:

public class CommentsExpandableListAdapter extends BaseExpandableListAdapter { 

    // 4 Child types 
    private static final int CHILD_TYPE_1 = 0; 
    private static final int CHILD_TYPE_2 = 1; 
    private static final int CHILD_TYPE_3 = 2; 
    private static final int CHILD_TYPE_UNDEFINED = 3; 

    // 3 Group types 
    private static final int GROUP_TYPE_1 = 0; 
    private static final int GROUP_TYPE_2 = 1; 
    private static final int GROUP_TYPE_3 = 2; 

    private Activity context; 
    private Map<String, List<String>> comments_feed_collection; 
    private List<String> group_list; 

    public CommentsExpandableListAdapter(Activity context, List<String> group_list, 
             Map<String, List<String>> comments_feed_collection) { 
     this.context = context; 
     this.comments_feed_collection = comments_feed_collection; 
     this.group_list = group_list; 
    } 

    public Object getChild(int groupPosition, int childPosition) { 
     return comments_feed_collection.get(group_list.get(groupPosition)).get(childPosition); 
    } 

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

    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
     final String incoming_text = (String) getChild(groupPosition, childPosition); 
     LayoutInflater inflater = context.getLayoutInflater(); 

     int childType = getChildType(groupPosition, childPosition); 

     // We need to create a new "cell container" 
     if (convertView == null || convertView.getTag() != childType) { 
      switch (childType) { 
       case CHILD_TYPE_1: 
        convertView = inflater.inflate(R.layout.description_of_ads_expandable_list, null); 
        convertView.setTag(childType); 
        break; 
       case CHILD_TYPE_2: 
        convertView = inflater.inflate(R.layout.comments_create_comment, null); 
        convertView.setTag(childType); 
        break; 
       case CHILD_TYPE_3: 
        convertView = inflater.inflate(R.layout.comments_expandable_list_child, null); 
        convertView.setTag(childType); 
        break; 
       case CHILD_TYPE_UNDEFINED: 
        convertView = inflater.inflate(R.layout.comments_undefined, null); 
        convertView.setTag(childType); 
        break; 
       default: 
        // Maybe we should implement a default behaviour but it should be ok we know there are 4 child types right? 
        break; 
      } 
     } 
     // We'll reuse the existing one 
     else { 
      // There is nothing to do here really we just need to set the content of view which we do in both cases 
     } 

     switch (childType) { 
      case CHILD_TYPE_1: 
       TextView description_child = (TextView) convertView.findViewById(R.id.description_of_ads_expandable_list_child_text_view); 
       description_child.setText(incoming_text); 
       break; 
      case CHILD_TYPE_2: 
       //Define how to render the data on the CHILD_TYPE_2 layout 
       break; 
      case CHILD_TYPE_3: 
       //Define how to render the data on the CHILD_TYPE_3 layout 
       break; 
      case CHILD_TYPE_UNDEFINED: 
       //Define how to render the data on the CHILD_TYPE_UNDEFINED layout 
       break; 
     } 

     return convertView; 
    } 

    public int getChildrenCount(int groupPosition) { 
     String groupName = group_list.get(groupPosition); 
     List<String> groupContent = comments_feed_collection.get(groupName); 
     return groupContent.size(); 
    } 

    public Object getGroup(int groupPosition) { 
     return group_list.get(groupPosition); 
    } 
    public int getGroupCount() { 
     return group_list.size(); 
    } 

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

    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
     LayoutInflater inflater = context.getLayoutInflater(); 
     final String incoming_text = (String) getGroup(groupPosition); 

     int groupType = getGroupType(groupPosition); 

     // We need to create a new "cell container" 
     if (convertView == null || convertView.getTag() != groupType) { 
      switch (groupType) { 
       case GROUP_TYPE_1 : 
        convertView = inflater.inflate(R.layout.expandable_list_single_item, null); 
        break; 
       case GROUP_TYPE_2: 
        // Am using the same layout cause am lasy and don't wanna create other ones but theses should be different 
        // or the group type shouldnt exist 
        convertView = inflater.inflate(R.layout.expandable_list_single_item, null); 
        break; 
       case GROUP_TYPE_3: 
        // Am using the same layout cause am lasy and don't wanna create other ones but theses should be different 
        // or the group type shouldnt exist 
        convertView = inflater.inflate(R.layout.expandable_list_single_item, null); 
        break; 
       default: 
        // Maybe we should implement a default behaviour but it should be ok we know there are 3 group types right? 
        break; 
      } 
     } 
     // We'll reuse the existing one 
     else { 
      // There is nothing to do here really we just need to set the content of view which we do in both cases 
     } 

     switch (groupType) { 
      case GROUP_TYPE_1 : 
       TextView item = (TextView) convertView.findViewById(R.id.expandable_list_single_item_text_view_group); 
       item.setTypeface(null, Typeface.BOLD); 
       item.setText(incoming_text); 
       break; 
      case GROUP_TYPE_2: 
       //TODO: Define how to render the data on the GROUPE_TYPE_2 layout 
       // Since i use the same layout as GROUPE_TYPE_1 i could do the same thing as above but i choose to do nothing 
       break; 
      case GROUP_TYPE_3: 
       //TODO: Define how to render the data on the GROUPE_TYPE_3 layout 
       // Since i use the same layout as GROUPE_TYPE_1 i could do the same thing as above but i choose to do nothing 
       break; 
      default: 
       // Maybe we should implement a default behaviour but it should be ok we know there are 3 group types right? 
       break; 
     } 

     return convertView; 
    } 


    public boolean hasStableIds() { 
     return true; 
    } 


    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return false; 
    } 


    @Override 
    public int getChildTypeCount() { 
     return 4; // I defined 4 child types (CHILD_TYPE_1, CHILD_TYPE_2, CHILD_TYPE_3, CHILD_TYPE_UNDEFINED) 
    } 

    @Override 
    public int getGroupTypeCount() { 
     return 3; // I defined 3 groups types (GROUP_TYPE_1, GROUP_TYPE_2, GROUP_TYPE_3) 
    } 

    @Override 
    public int getGroupType(int groupPosition) { 
     switch (groupPosition) { 
      case 0: 
       return GROUP_TYPE_1; 
      case 1: 
       return GROUP_TYPE_1; 
      case 2: 
       return GROUP_TYPE_2; 
      default: 
       return GROUP_TYPE_3; 
     } 
    } 

    @Override 
    public int getChildType(int groupPosition, int childPosition) { 
     switch (groupPosition) { 
      case 0: 
       switch (childPosition) { 
        case 0: 
         return CHILD_TYPE_1; 
        case 1: 
         return CHILD_TYPE_UNDEFINED; 
        case 2: 
         return CHILD_TYPE_UNDEFINED; 
       } 
       break; 
      case 1: 
       switch (childPosition) { 
        case 0: 
         return CHILD_TYPE_2; 
        case 1: 
         return CHILD_TYPE_3; 
        case 2: 
         return CHILD_TYPE_3; 
       } 
       break; 
      default: 
       return CHILD_TYPE_UNDEFINED; 
     } 

     return CHILD_TYPE_UNDEFINED; 
    } 
} 

Und das ist, wie es aussieht

:

Hoffe, das hilft, lassen Sie mich wissen, ob es tut/nicht.