Question

我想知道我的应用程序数据中的可扩展列表视图中的复选框状态来自服务器。

我的 ProductsCategory.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;
    }
}

我想知道选中哪个按钮复选框并调用userdefine方法。当我选中一个复选框和collasped组然后再次展开组时，复选框的位置会发生变化。

我给出了两个位置的快照： -

当我进行collasped并再次展开时，复选框的位置会发生变化。

Answer 1

它实际上与带有复选框的列表视图类似。你需要在内部记住状态（例如使用布尔数组或集合）并在状态上提供一个getter。

从您的子布局中获取复选框并添加一个监听器

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);
                }
            }
        });

        ...

    }
    ...
}

为已检查状态添加一个getter

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

稀疏填充的Set包含所有已检查的组/子项。您可以调用该方法，例如在你的活动中。

关于你的第二个问题：我假设在折叠/扩展一个群组时，由于现在在不同位置的一些内部重复使用的子视图，被检查的孩子是不正确的。

另外，请不要忘记复选框项目中的以下布局属性，以免松动子项目的单击事件。

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

如何在android中的expandable listview中获取复选框状态

1 个答案: