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如何在mainActivity中设置ExpandableListView的子视图

expandablelistadapter expandablelistview listview android

Hessam-Emami · 技术社区 · 7 年前

我刚刚完成了自定义ExpandableListView适配器的实现, 现在在主要活动中,我不知道如何为我的两个自定义ArrayList(一个用于groupView,另一个用于childView)编写代码。 ExpandableListView的GroupView工作正常,但我不知道应该如何编写代码并设置子视图的数据。

让我们考虑组和子视图的所有数据,如下所示:

X.add(new Word(R.drawable.ic_launcher_background,"A" , "#11111"));

因此,ExpandableListView的子视图和组视图的行中都有两个文本和一个img。

-谢谢

主要活动。JAVA

public class MainActivity extends Activity {

    private ExpandListAdapter ExpAdapter;
    private ArrayList<Word> ExpListItems;
    private ExpandableListView ExpandList;

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

        ExpandList = (ExpandableListView) findViewById(R.id.lvExp);
        ExpAdapter = new ExpandListAdapter(MainActivity.this, ExpListItems);

        ExpListItems = new ArrayList<Word>();
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"A" , "#11111"));
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"B" , "#11111"));
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"C" , "#11111"));
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"D" , "#11111"));
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"E" , "#11111"));
        ExpListItems.add(new Word(R.drawable.ic_launcher_background,"F" , "#11111"));

        ExpandList.setAdapter(ExpAdapter);


    }

ExpandListAdapter。java(删除不必要的代码)

    public class ExpandListAdapter extends BaseExpandableListAdapter {
    public Context context;
    public ArrayList<Word> groups ;

        public ExpandListAdapter(Context context, ArrayList<Word> groups) {
            this.context = context;
            this.groups = groups;
        }

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

        @Override
        public int getChildrenCount(int i) {
            ArrayList<Word> childList = groups.get(i).getItems();
            return childList.size();
        }



        @Override
        public Object getChild(int i, int i1) {
            ArrayList<Word> childList = groups.get(i).getItems();
            return childList.get(i1);
        }
    .
.
.


        @Override
        public long getChildId(int i, int i1) {
            return i1;
        }

        .
        .
        .
        .

        @Override
        public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
            View listItemView = view;
            if(listItemView == null) {
                LayoutInflater inflater = (LayoutInflater) this.context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                assert inflater != null;
                listItemView = inflater.inflate(R.layout.child_row,null);
            }

            Word currentWord = groups.get(i);
            TextView nameText = (TextView) listItemView.findViewById(R.id.childNameView);
            nameText.setText(currentWord.getBakhsh());


            TextView numberText = (TextView) listItemView.findViewById(R.id.childNumView);
            numberText.setText(currentWord.getNumber());


            ImageView imageIcons = (ImageView) listItemView.findViewById(R.id.childImageView);
            if (currentWord.hasImage()) {
                imageIcons.setImageResource(currentWord.getImage());


            return listItemView;

        }

        @Override
        public boolean isChildSelectable(int i, int i1) {
            return true;
        }
    }

1 回复 | 直到 7 年前

i_A_mok 7 年前

您可以将子项放置到地图中,其中组中的唯一字段作为键,因此可能如下所示:

onCreate():

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ExpandList = (ExpandableListView) findViewById(R.id.lvExp);

    ExpListItems = new ArrayList<Word>();
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "A" , "#11111"));
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "B" , "#11111"));
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "C" , "#11111"));
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "D" , "#11111"));
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "E" , "#11111"));
    ExpListItems.add(new Word(R.drawable.ic_launcher_background, "F" , "#11111"));
    Map<String, List<Word>> mapChild = new HashMap<>();
    for(Word word: ExpListItems){
        List<Word> listChild = new ArrayList<>();
        listChild.add(new Word(R.drawable.ic_launcher_background, "Aa" , "#11111"));
        listChild.add(new Word(R.drawable.ic_launcher_background, "Bb" , "#11111"));
        listChild.add(new Word(R.drawable.ic_launcher_background, "Cc" , "#11111"));
        mapChild.put(word.getBakhsh(), listChild);
    }

    ExpAdapter = new ExpandListAdapter(MainActivity.this, ExpListItems, mapChild);
    ExpandList.setAdapter(ExpAdapter);
}

您的适配器:

public class ExpandListAdapter extends BaseExpandableListAdapter {
public Context context;
public ArrayList<Word> groups ;
public Map<String, List<Word>> childs;

public ExpandListAdapter(Context context, ArrayList<Word> groups, Map<String, List<Word>> childs) {
    this.context = context;
    this.groups = groups;
    this.childs = childs;
}

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

@Override
public int getChildrenCount(int i) {
    return childs.get(groups.get(i).getBakhsh()).size();
}

@Override
public Word getGroup(int i) {
    return groups.get(i);
}

@Override
public Word getChild(int i, int i1) {
    return childs.get(groups.get(i).getBakhsh()).get(i1);
}

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

@Override
public long getChildId(int i, int i1) {
    return i1;
}

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

@Override
public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
    View listItemView = view;
    if (listItemView == null) {
        LayoutInflater inflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        assert inflater != null;
        listItemView = inflater.inflate(R.layout.child_row, null);
    }

    Word currentWord = getGroup(i);
    TextView nameText = (TextView) listItemView.findViewById(R.id.childNameView);
    nameText.setText(currentWord.getBakhsh());

    TextView numberText = (TextView) listItemView.findViewById(R.id.childNumView);
    numberText.setText(currentWord.getNumber());

    ImageView imageIcons = (ImageView) listItemView.findViewById(R.id.childImageView);
    if (currentWord.hasImage()) {
        imageIcons.setImageResource(currentWord.getImage());
    }
    return listItemView;
}

@Override
public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
    View listItemView = view;
    if (listItemView == null) {
        LayoutInflater inflater = (LayoutInflater) this.context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        assert inflater != null;
        listItemView = inflater.inflate(R.layout.child_row, null);
    }

    Word currentWord = getChild(i,i1);
    TextView nameText = (TextView) listItemView.findViewById(R.id.childNameView);
    nameText.setText(currentWord.getBakhsh());

    TextView numberText = (TextView) listItemView.findViewById(R.id.childNumView);
    numberText.setText(currentWord.getNumber());

    ImageView imageIcons = (ImageView) listItemView.findViewById(R.id.childImageView);
    if (currentWord.hasImage()) {
        imageIcons.setImageResource(currentWord.getImage());
    }
    return listItemView;
}

@Override
public boolean isChildSelectable(int i, int i1) {
    return true;
}
}

我在这里回答了关于ExpandableListView的另一个问题: Tree with checkBox ,您也可以尝试该示例。希望有帮助!