如何使用JSON数组制作ExpandableListView
我想创建一个ExpandableListView，它从服务器（JSON数组）的响应中获取其组及其子组的数据。 这是我的json：
[ { " "begdate": "23/07/2013", "nama": "OPTIK INTERNASIONAL", "img_id": 2, "alamat": "Jl. Nasional No 23 Meulaboh", "enddate": "23/07/2015", }, { "begdate": "01/05/2013", "nama": "EL JOHN SMOKING LOUNGE", "img_id": 3, "alamat": "Bandara Sultan Iskandar Muda, Banda Aceh", "enddate": "30/04/2014", }, { "begdate": "09/11/2012", "nama": "ESPRESSO COFFE", "img_id": 2 "alamat": "JL. SOEKARNO HATTA No. 16-17, Simpang Dodi", "enddate": "09/11/2014", }, { "begdate": "16/03/2012", "nama": "LUZI PERFUME", "img_id": 3, "alamat": "JL. MATA IE KETAPANG II", "enddate": "16/03/2014", } ] “alamat”和nama“将成为团体，”begdate“和”enddate“将成为他们的孩子。我从这里按照教程： http ： //en.wikicode.org/index.php/Custom_ExpandableListView但是当我实现它时，我得到错误我的代码有什么问题吗？这是我的logcat：
08-16 15:18:34.541: E/AndroidRuntime(416): FATAL EXCEPTION: main 08-16 15:18:34.541: E/AndroidRuntime(416): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0 08-16 15:18:34.541: E/AndroidRuntime(416): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 08-16 15:18:34.541: E/AndroidRuntime(416): at java.util.ArrayList.get(ArrayList.java:311) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.example.belajaraccordion.TerbaruSimasCard.fetchResponse(TerbaruSimasCard.java:106) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.example.belajaraccordion.TerbaruSimasCard.access$1(TerbaruSimasCard.java:85) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.example.belajaraccordion.TerbaruSimasCard$TerbaruAsyncTask.onPostExecute(TerbaruSimasCard.java:77) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.example.belajaraccordion.TerbaruSimasCard$TerbaruAsyncTask.onPostExecute(TerbaruSimasCard.java:1) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.os.AsyncTask.finish(AsyncTask.java:417) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.os.AsyncTask.access$300(AsyncTask.java:127) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.os.Handler.dispatchMessage(Handler.java:99) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.os.Looper.loop(Looper.java:123) 08-16 15:18:34.541: E/AndroidRuntime(416): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-16 15:18:34.541: E/AndroidRuntime(416): at java.lang.reflect.Method.invokeNative(Native Method) 08-16 15:18:34.541: E/AndroidRuntime(416): at java.lang.reflect.Method.invoke(Method.java:507) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-16 15:18:34.541: E/AndroidRuntime(416): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-16 15:18:34.541: E/AndroidRuntime(416): at dalvik.system.NativeStart.main(Native Method)
这是我的代码：
TerbaruSimasCard.java
public class TerbaruSimasCard extends Activity { private ProgressDialog dialog; private ArrayListListTerbaru; private ArrayList<ArrayList<ArrayList>> ListChildTerbaru; ListView list; String phone1, begdate1, enddate1,img_id1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.terbarusimascard); ListTerbaru= new ArrayList(); ListChildTerbaru= new ArrayList<ArrayList<ArrayList>>(); new TerbaruAsyncTask().execute(); } public class TerbaruAsyncTask extends AsyncTask { String url = ("http://www.domain.com/123"); public TerbaruAsyncTask() { this.url=url; } protected void onPreExecute (){ super.onPreExecute(); dialog = ProgressDialog.show(TerbaruSimasCard.this,"", "melakukan pengambilan data..."); } @Override protected String doInBackground(Void... params) { String result = ""; try { result= Connection.get(url); } catch (Exception e){ result = ""; Log.d("test", e.getMessage()); } return result; } @Override protected void onPostExecute (String result){ super.onPostExecute(result); fetchResponse(result.replace("\n","").trim()); dialog.dismiss(); } } private void fetchResponse (String result){ if (!result.equals("")){ try { JSONArray jsonArray = new JSONArray(result); TerbaruModel LT=null; ChildTerbaru CT=null; for (int i= 0; i < jsonArray.length(); i++) { JSONObject jsonObject= jsonArray.getJSONObject (i); LT= new TerbaruModel ( jsonObject.optString("img_id"), jsonObject.optString("nama"), jsonObject.optString("alamat") ); ListTerbaru.add(LT); for (int j= 0; j <jsonArray.length(); j++) { CT= new ChildTerbaru ( jsonObject.optString("begdate"), jsonObject.optString("enddate") ); ListChildTerbaru.get(i).get(j).add(CT); } ExpandableListView list = (ExpandableListView) findViewById(R.id.ExpandableListView01); TerbaruAdapter adapter = new TerbaruAdapter(this, ListTerbaru,ListChildTerbaru); list.setAdapter(adapter); } } catch (JSONException e){ e.printStackTrace(); } } } }
这是我的TerbaruAdapter.java：
public class TerbaruAdapter extends BaseExpandableListAdapter{ Context context; ArrayListListTerbaru; ArrayList<ArrayList<ArrayList>> ListChildTerbaru; int count; public TerbaruAdapter (Context context, ArrayListListTerbaru,ArrayList<ArrayList<ArrayList>> ListChildTerbaru){ this.context=context; this.ListTerbaru=ListTerbaru; this.ListChildTerbaru=ListChildTerbaru; // this.count=ListTerbaru.size(); // this.count=ListChildTerbaru.size(); } @Override public boolean areAllItemsEnabled() { return true; } @Override public ArrayList getChild(int groupPosition, int childPosition) { return ListChildTerbaru.get(groupPosition).get(childPosition); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild,View convertView, ViewGroup parent) { ChildTerbaru ListChildTerbaru = (ChildTerbaru) ((ArrayList)getChild(groupPosition, childPosition)).get(0); ViewHolder holder= null; if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.expandablelistview_child, null); holder=new ViewHolder(); holder.begdate1=(TextView)convertView.findViewById(R.id.beg_date); holder.enddate1=(TextView)convertView.findViewById(R.id.end_date); } else{ holder=(ViewHolder)convertView.getTag(); } holder.begdate1.setText(ListChildTerbaru.getBegDate()); holder.enddate1.setText(ListChildTerbaru.getEndDate()); return convertView; } @Override public int getChildrenCount(int groupPosition) { return ListChildTerbaru.get(groupPosition).size(); } @Override public TerbaruModel getGroup(int groupPosition) { return ListTerbaru.get(groupPosition); } @Override public int getGroupCount() { return ListTerbaru.size(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TerbaruModel ListTerbaru = (TerbaruModel) getGroup(groupPosition); ViewHolder holder= null; if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.expandablelistview_group, null); holder=new ViewHolder(); holder.nama=(TextView)convertView.findViewById(R.id.name); holder.alamat=(TextView)convertView.findViewById(R.id.adress); } else{ holder=(ViewHolder)convertView.getTag(); } holder.nama.setText(ListTerbaru.getNama()); holder.alamat.setText(ListTerbaru.getAlamat()); return convertView; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int arg0, int arg1) { return true; } static class ViewHolder{ TextView begdate1, enddate1,nama, alamat, imageid; } }
我不知道我的错在哪里，是因为我在解析JSON时错了吗？
for (int i= 0; i < jsonArray.length(); i++) { JSONObject jsonObject= jsonArray.getJSONObject (i); LT= new TerbaruModel ( jsonObject.optString("img_id"), jsonObject.optString("nama"), jsonObject.optString("alamat") ); ListTerbaru.add(LT); for (int j= 0; j <jsonArray.length(); j++) { CT= new ChildTerbaru ( jsonObject.optString("begdate"), jsonObject.optString("enddate") ); ListChildTerbaru.get(i).get(j).add(CT); }
或者还有什么不对吗？ 我希望有人可以告诉我哪里是我的错……谢谢
修改适配器
public class TerbaruAdapter extends BaseExpandableListAdapter{ Context context; ArrayListListTerbaru; ArrayList> ListChildTerbaru; int count; public TerbaruAdapter (Context context, ArrayListListTerbaru,ArrayList> ListChildTerbaru){ this.context=context; this.ListTerbaru=ListTerbaru; this.ListChildTerbaru=ListChildTerbaru; // this.count=ListTerbaru.size(); // this.count=ListChildTerbaru.size(); } @Override public boolean areAllItemsEnabled() { return true; } @Override public ChildTerbaru getChild(int groupPosition, int childPosition) { return ListChildTerbaru.get(groupPosition).get(childPosition); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild,View convertView, ViewGroup parent) { ChildTerbaru childTerbaru = getChild(groupPosition, childPosition); ViewHolder holder= null; if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.expandablelistview_child, null); holder=new ViewHolder(); holder.begdate1=(TextView)convertView.findViewById(R.id.beg_date); holder.enddate1=(TextView)convertView.findViewById(R.id.end_date); convertView.setTag(holder); } else{ holder=(ViewHolder)convertView.getTag(); } holder.begdate1.setText(childTerbaru.getBegDate()); holder.enddate1.setText(childTerbaru.getEndDate()); return convertView; } @Override public int getChildrenCount(int groupPosition) { return ListChildTerbaru.get(groupPosition).size(); } @Override public TerbaruModel getGroup(int groupPosition) { return ListTerbaru.get(groupPosition); } @Override public int getGroupCount() { return ListTerbaru.size(); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { TerbaruModel terbaruModel = (TerbaruModel) getGroup(groupPosition); ViewHolder holder= null; if (convertView == null) { LayoutInflater infalInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = infalInflater.inflate(R.layout.expandablelistview_group, null); holder=new ViewHolder(); holder.nama=(TextView)convertView.findViewById(R.id.name); holder.alamat=(TextView)convertView.findViewById(R.id.address); convertView.setTag(holder); } else{ holder=(ViewHolder)convertView.getTag(); } holder.nama.setText(terbaruModel.getNama()); holder.alamat.setText(terbaruModel.getAlamat()); return convertView; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int arg0, int arg1) { return true; } static class ViewHolder{ TextView begdate1, enddate1,nama, alamat, imageid; } }
而你的活动
public class TerbaruSimasCard extends Activity { private ProgressDialog dialog; private ArrayList ListTerbaru = null; private ArrayList ListChildTerbaru = null; private ArrayList> ListChildXXXXXXXXX = null; ListView list; String phone1, begdate1, enddate1, img_id1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.sample); ListTerbaru = new ArrayList(); ListChildTerbaru = new ArrayList();//ArrayList>>(); ListChildXXXXXXXXX = new ArrayList>(); new TerbaruAsyncTask().execute(); } public class TerbaruAsyncTask extends AsyncTask { String url = ("http:www.domain.com/123"); public TerbaruAsyncTask() { this.url = url; } protected void onPreExecute() { super.onPreExecute(); dialog = ProgressDialog.show(TerbaruSimasCard.this, "", "melakukan pengambilan data..."); } @Override protected String doInBackground(Void... params) { String result = ""; try { result = Connection.get(url); } catch (Exception e) { result = ""; Log.d("test", e.getMessage()); } return result; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); fetchResponse(result.replace("\n", "").trim()); dialog.dismiss(); } } private void fetchResponse(String result) { if (!result.equals("")) { try { JSONArray jsonArray = new JSONArray(result); TerbaruModel LT = null; ChildTerbaru CT = null; for (int i = 0; i < jsonArray.length(); i++) { ListChildTerbaru = new ArrayList (); JSONObject jsonObject = jsonArray.getJSONObject(i); LT = new TerbaruModel(jsonObject.optString("img_id"), jsonObject.optString("nama"), jsonObject.optString("alamat")); ListTerbaru.add(LT); //for (int j = 0; j < jsonArray.length(); j++) { CT = new ChildTerbaru(jsonObject.optString("begdate"), jsonObject.optString("enddate")); ListChildTerbaru.add(CT);//get(i).get(i).add(CT); //} ListChildXXXXXXXXX.add(ListChildTerbaru); ExpandableListView list = (ExpandableListView) findViewById(R.id.expandablelistView); TerbaruAdapter adapter = new TerbaruAdapter(this,ListTerbaru, ListChildXXXXXXXXX); list.setAdapter(adapter); } } catch (JSONException e) { e.printStackTrace(); } } } }