如何在android中的expandable listview中獲取復選框狀態

Question

我想知道我的應用程序數據中的可擴展列表視圖中的復選框狀態來自服務器。

我的產品分類.java ： -

    public class ProductsCategory extends AppCompatActivity {

    private ListView listView;
    private GridView gridView;
    ProductsAdapter  adapter;
    ProductsAdapterGridView adapterGridView;
    ArrayList<Products> productsList = new ArrayList<>();
    String menu_id;
    TextView textView,textViewfilter;

    // Filter Class
    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader = new ArrayList<>();
    HashMap<String, List<String>> listDataChild = new HashMap<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.produts_category);

        Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(mToolbar);
        getSupportActionBar().setTitle("Shopping Mazza");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);

        Intent i = getIntent();
        menu_id = i.getStringExtra("category");
        adapter = new ProductsAdapter(ProductsCategory.this,R.layout.product_page_list_view,productsList);
        adapterGridView = new ProductsAdapterGridView(ProductsCategory.this,R.layout.products_page_grid_view,productsList);
        expListView = (ExpandableListView) findViewById(R.id.filter_expandable_list_view);
        listView = (ListView)findViewById(R.id.list_product);
        gridView = (GridView)findViewById(R.id.list_product_grid);
        textView = (TextView)findViewById(R.id.change_view);
        textViewfilter = (TextView)findViewById(R.id.textView);

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(listView.getVisibility()==View.VISIBLE){
                    listView.setVisibility(View.GONE);
                    gridView.setVisibility(View.VISIBLE);
                }
                else {
                    listView.setVisibility(View.VISIBLE);
                    gridView.setVisibility(View.GONE);
                }
            }
        });

        textViewfilter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (expListView.getVisibility() == View.VISIBLE) {

                    listDataHeader.clear();
                    listDataChild.clear();

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

                    listAdapter.notifyDataSetChanged();
                    expListView.setVisibility(View.GONE);
                }
                else {
                        expListView.setVisibility(View.VISIBLE);

                    // preparing list data
                    //    prepareListData();
                    new PrepareListData().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/filters&key=test123$");

                    // Listview Group click listener
                    expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

                        @Override
                        public boolean onGroupClick(ExpandableListView parent, View v,
                                                    int groupPosition, long id) {
                            // Toast.makeText(getApplicationContext(),
                            // "Group Clicked " + listDataHeader.get(groupPosition),
                            // Toast.LENGTH_SHORT).show();
                            return false;

                        }
                    });

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

                        @Override
                        public void onGroupExpand(int groupPosition) {
                            Toast.makeText(getApplicationContext(),
                                    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(getApplicationContext(),
                                    listDataHeader.get(groupPosition) + " Collapsed",
                                    Toast.LENGTH_SHORT).show();

                        }
                    });

                    // 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(
                                    getApplicationContext(),
                                    listDataHeader.get(groupPosition)
                                            + " : "
                                            + listDataChild.get(
                                            listDataHeader.get(groupPosition)).get(
                                            childPosition), Toast.LENGTH_SHORT)
                                    .show();
                            return false;
                        }
                    });

                 /*   Intent i = new Intent(ProductsCategory.this,FilterClass.class);
                    i.putExtra("category_id",menu_id);
                    startActivity(i);*/
                }
            }
        });

        new Product().execute("http://opencart.codeniques.com/shopping/?route=feed/web_api/products&key=test123$");
    }
    public class PrepareListData extends AsyncTask<String,Void,Void>{
        ProgressDialog dialog;
        @Override
        protected synchronized void onPreExecute() {
            super.onPreExecute();
            dialog = new ProgressDialog(ProductsCategory.this);
            dialog.setCancelable(false);
            dialog.show();
        }

        @Override
        protected synchronized  Void doInBackground(String... params) {
            try {
                HttpClient client = new DefaultHttpClient();
                HttpPost post = new HttpPost(params[0]);
                List<NameValuePair> nameValuePairs = new ArrayList<>(1);

                nameValuePairs.add(new BasicNameValuePair("category",menu_id));
                post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                HttpResponse response = client.execute(post);

                if(response.getStatusLine().getStatusCode()==200){

                    HttpEntity entity = response.getEntity();
                    String data = EntityUtils.toString(entity);

                    JSONObject jsonObject = new JSONObject(data);
                    JSONArray jsonArray = jsonObject.getJSONArray("filters");

                    //     Log.d("jsonarray",jsonArray.length()+"");

                    Log.d("filter",jsonArray+"");

                    for(int i=0;i<jsonArray.length();i++){

                        JSONObject jsonObject1 = jsonArray.getJSONObject(i);

                        String s = jsonObject1.getString("filter_group_id");
                        listDataHeader.add(jsonObject1.getString("name"));

                        JSONArray jsonArray1 = jsonObject1.getJSONArray("filter");

                        List<String> firstlevel = new ArrayList<>();
                        for(int j=0;j<jsonArray1.length();j++){

                            JSONObject jsonObject11 = jsonArray1.optJSONObject(j);

                            String s1 = jsonObject11.getString("filter_id");
                            String colorcode = jsonObject11.getString("colorcode");
                            firstlevel.add(jsonObject11.getString("name"));
                        }
                        listDataChild.put(listDataHeader.get(i), firstlevel);
                        Log.d("listDataHeader", listDataHeader.get(i)+"");
                        Log.d("value of", firstlevel + "");
                        Log.d("hash map", listDataChild.size() + "");
                        //  firstlevel.clear();
                    }
                }
            }catch (IOException |JSONException e){
                Log.e("Error :", e.getMessage());
            }
            return null;
        }
        @Override
        protected synchronized void onPostExecute(Void aVoid) {
            //  super.onPostExecute(aVoid);
            dialog.dismiss();
            listAdapter = new ExpandableListAdapter(ProductsCategory.this, listDataHeader, listDataChild);
            // setting list adapter
            expListView.setAdapter(listAdapter);

        }
    }

我的ExpandableListAdapter ： -

    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 infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_item_filter, null);


        }

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

        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 infalInflater = (LayoutInflater) this._context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = infalInflater.inflate(R.layout.list_group_filter, null);
        }

        TextView lblListHeader = (TextView) convertView
                .findViewById(R.id.lblListHeader);
        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;
    }
}

我想知道選中了哪個按鈕復選框並調用userdefine方法。當我選中一個復選框和collasped組然后再次展開組時，復選框的位置會發生變化。

我給出了兩個位置的快照： -

當我進行collasped並再次擴展復選框位置是改變。

Answer 1

它實際上與帶有復選框的列表視圖類似。 您需要在內部記住狀態（例如，使用布爾數組或集合）並在狀態上提供getter。

1. 從您的子布局中獲取復選框並添加一個監聽器

    public class ExpandableListAdapter extends BaseExpandableListAdapter { ... private final Set<Pair<Long, Long>> mCheckedItems = new HashSet<Pair<Long, Long>>(); ... public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { ... final CheckBox cb = (CheckBox) convertView.findViewById(R.id.your_checkbox_id); // add tag to remember groupId/childId final Pair<Long, Long> tag = new Pair<Long, Long>( getGroupId(groupPosition), getChildId(groupPosition, childPosition)); cb.setTag(tag); // set checked if groupId/childId in checked items cb.setChecked(mCheckedItems.contains(tag)); // set OnClickListener to handle checked switches cb.setOnClickListener(new OnClickListener() { public void onClick(View v) { final CheckBox cb = (CheckBox) v; final Pair<Long, Long> tag = (Pair<Long, Long>) v.getTag(); if (cb.isChecked()) { mCheckedItems.add(tag); } else { mCheckedItems.remove(tag); } } }); ... } ... } 

2. 為已檢查狀態添加一個getter

    public class ExpandableListAdapter extends BaseExpandableListAdapter { ... public Set<Pair<Long, Long>> getCheckedItems() { return mCheckedItems; } ... } 

稀疏填充的Set包含所有已檢查的組/子項。 您可以在您的活動中調用該方法。

關於你的第二個問題：我假設當折疊/擴展一個組時，被檢查的孩子是不正確的，因為現在在不同的位置有一些內部重用的子視圖。

另外，請不要忘記復選框項目上的以下布局屬性，以免松動子項目的單擊事件。

android:focusable="false"
android:focusableInTouchMode="false"