Question

我正在使用列表视图创建多级可扩展列表视图。所以我想要点击它时列表视图的指示符发生了变化。我在drawable文件夹中有两个png图像。点击事件无法正常工作。点击减号时没有来。我指的是 this < / strong>即可。我的主要活动

true

我的listitem xml是

public class MainActivity extends Activity { List<NLevelItem> lists; ListView listView; RequestQueue requestQueue1, requestQueue2; int[] firstcatid = null,secondcatid = null; String firsttitle[] = null,secondtitle[] = null; int j = 0; //ArrayList<Group> list,list2,list3; NLevelItem parent; Boolean b=false; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listView = (ListView) findViewById(R.id.listView1); lists = new ArrayList<NLevelItem>(); // Random rng = new Random(); final LayoutInflater inflater = LayoutInflater.from(this); requestQueue1= Volley.newRequestQueue(this); JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, "http://www.fasr.com/cntrldata/ezproductfristcategory.php", new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { try { //list = new ArrayList<Group>(); JSONArray ja = response.getJSONArray("hi"); JSONArray ja2 = response.getJSONArray("hi2"); JSONArray ja3 = response.getJSONArray("hi3"); firsttitle = new String[ja.length()]; firstcatid = new int[ja.length()]; JSONObject jsonObject2 = null, jsonObject3 = null, jsonObject; for (int i = 0; i < ja.length(); i++) { jsonObject = ja.getJSONObject(i); // Log.e("hie",jsonObject2.getInt("second_category_id")+""); //jsonObject3 = ja3.getJSONObject(i); firstcatid[i] = jsonObject.getInt("first_category_id"); firsttitle[i] = jsonObject.getString("first_category_name"); } secondcatid = new int[ja2.length()]; for (int i = 0; i < ja2.length(); i++) { jsonObject2 = ja2.getJSONObject(i); secondcatid[i] = jsonObject2.getInt("second_category_id"); } for (int i = 0; i < ja.length(); i++) { final NLevelItem grandParent = new NLevelItem(new SomeObject(firsttitle[i]), null, new NLevelView() { @Override public View getView(NLevelItem item) { final View view = inflater.inflate(R.layout.list_item, null); TextView tv = (TextView) view.findViewById(R.id.textView); final ImageView iv=(ImageView)view.findViewById(R.id.imageView); //tv.setBackgroundColor(Color.GREEN); iv.setVisibility(View.VISIBLE); /* view.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getApplicationContext(),"hello",Toast.LENGTH_SHORT).show(); if(!b){ iv.setBackgroundResource(R.drawable.ic_action_minus); b=true; }else { b=false; iv.setBackgroundResource(R.drawable.ic_action_add); } } });*/ String name = (String) ((SomeObject) item.getWrappedObject()).getName(); tv.setText(name); return view; } }); lists.add(grandParent); //int numChildren = rng.nextInt(4) + 1; for (int j = 0; j < ja2.length(); j++) { jsonObject2 = ja2.getJSONObject(j); if (firstcatid[i] == jsonObject2.getInt("first_category_id")) { parent = new NLevelItem(new SomeObject(jsonObject2.getString("second_category_name")), grandParent, new NLevelView() { @Override public View getView(NLevelItem item) { View view = inflater.inflate(R.layout.list_item, null); TextView tv = (TextView) view.findViewById(R.id.textView); //tv.setBackgroundColor(Color.YELLOW); tv.setPadding(20,0,0,0); String name = (String) ((SomeObject) item.getWrappedObject()).getName(); tv.setText(name); return view; } }); lists.add(parent); } // int grandChildren = rng.nextInt(5) + 1; for (int k = 0; k < ja3.length(); k++) { jsonObject3 = ja3.getJSONObject(k); if (secondcatid[j] == jsonObject3.getInt("second_category_id")) { NLevelItem child = new NLevelItem(new SomeObject(jsonObject3.getString("third_category_name")), parent, new NLevelView() { @Override public View getView(NLevelItem item) { View view = inflater.inflate(R.layout.list_item, null); TextView tv = (TextView) view.findViewById(R.id.textView); //tv.setBackgroundColor(Color.GRAY); tv.setPadding(40,0,0,0); String name = (String) ((SomeObject) item.getWrappedObject()).getName(); tv.setText(name); return view; } }); lists.add(child);} } } } NLevelAdapter adapter = new NLevelAdapter(lists); listView.setAdapter(adapter); listView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { ((NLevelAdapter) listView.getAdapter()).toggle(arg2); ((NLevelAdapter) listView.getAdapter()).getFilter().filter(); } }); // Toast.makeText(getApplicationContext(),url[2],Toast.LENGTH_SHORT).show(); //output.setText(data); //ExpListItems = list; // ExpAdapter = new ExpandListAdapter(getApplicationContext(), ExpListItems); // ExpandList.setAdapter(ExpAdapter); } catch (JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.e("Volley", error.toString()); } } ); requestQueue1.add(jsonObjectRequest); } class SomeObject { public String name; public SomeObject(String name) { this.name = name; } public String getName() { return name; } }
我的照片是

Answer 1

在适配器的getGroupView()方法

中替换以下条件中的指标

if(isExpanded)
{
}
else
{
}

Answer 2

            @Override
            public View getView(NLevelItem item)
            {
                View convertView = inflater.inflate(R.layout.seperated_cows_first_row, null);

                TextView tv = (TextView) convertView.findViewById(R.id.tct_name);
                ImageView icon = (ImageView) convertView.findViewById(R.id.select_icon);

                String name = ((ListObject) item.getWrappedObject()).getName();
                tv.setText(name);

                if (item.isExpanded())
                    icon.setBackgroundResource(R.drawable.list_item_selector_icon_down);
                else
                    icon.setBackgroundResource(R.drawable.list_item_selector_icon_up);

                return convertView;
            }

这解决了我的问题

expandablelistview指标问题

2 个答案: