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我實現了ExpandableListAdapter，它顯然工作得很好。除了活動恢復時，子節點重複。我不知道如何解決這個問題，我在網上搜索這個，沒有發現任何有用的信息。ExpandableListView重複子節點
我減輕了問題，增加了一些!= null檢查。從而避免在不需要時插入和創建新數據。但是這並沒有解決問題。
這裏的CustomAdapter
public class ContatoAdapter extends BaseExpandableListAdapter {
private final Activity context;
private final Map<String, List<Contato>> contatosCollection;
private final List<String> area;
public ContatoAdapter(Activity context, List<String> area, Map<String, List<Contato>> contatosCollection) {
this.context = context;
this.contatosCollection = contatosCollection;
this.area = area;
}
@Override
public int getGroupCount() {
return area.size() ;
}
@Override
public int getChildrenCount(int groupPosition) {
return this.contatosCollection.get(area.get(groupPosition)).size();
}
@Override
public Object getGroup(int groupPosition) {
return this.area.get(groupPosition);
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return this.contatosCollection.get(this.area.get(groupPosition)).get(childPosition);
}
@Override
public long getGroupId(int groupPosition) {
return this.area.get(groupPosition).hashCode();
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return this.contatosCollection.get(this.area.get(groupPosition)).get(childPosition).hashCode();
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
String s = (String) getGroup(groupPosition);
final LayoutInflater gInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null){
convertView = gInflater.inflate(R.layout.group_item, parent, false);
}
final TextView item = (TextView) convertView.findViewById(R.id.list_header);
item.setText(s);
item.setTypeface(null, Typeface.BOLD);
return convertView;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
final Contato contato = (Contato) getChild(groupPosition, childPosition);
final LayoutInflater cInflater = this.context.getLayoutInflater();
if (convertView == null){
convertView = cInflater.inflate(R.layout.list_item, parent, false);
}
TextView item = (TextView) convertView.findViewById(R.id.list_item_nome);
ImageView ver = (ImageView) convertView.findViewById(R.id.list_item_ver);
ver.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context.getApplicationContext(), DetalheActivity.class);
intent.putExtra("contato", contato);
context.startActivity(intent);
}
});
item.setText(contato.getNome());
return convertView;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
下面是有listView與適配器的活動：
public class MedicosActivity extends AppCompatActivity {
private ExpandableListView listView;
private ArrayList<Contato> contatos;
private ArrayList<String> areas;
private HashMap<String, List<Contato>> contatosCollection;
private ContatoAdapter adapter;
String jsonString = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_medicos);
setTitle("Médicos | Etc");
init();
if (listView == null)
listView = (ExpandableListView) findViewById(android.R.id.list);
adapter = new ContatoAdapter(this,areas,contatosCollection);
listView.setAdapter(adapter);
listView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
Contato selected = (Contato) adapter.getChild(groupPosition,childPosition);
Toast.makeText(MedicosActivity.this, selected.getNome() , Toast.LENGTH_SHORT).show();
return true;
}
});
}
private void init() {
if (jsonString.isEmpty())
jsonString = JsonUtil.loadJSON(MedicosActivity.this, "data.json");
if (contatosCollection == null)
contatos = JsonUtil.parseJSON(jsonString);
if (areas == null){
areas = new ArrayList<>();
createGroupList();
}
if (contatosCollection == null){
contatosCollection = new HashMap<>();
createCollection();
}
}
private void createGroupList() {
for(Contato c : contatos){
if (!areas.contains(c.getArea())){
areas.add(c.getArea());
}
}
}
private void createCollection() {
for (Contato c : contatos){
List<Contato> ctg = contatosCollection.get(c.getArea());
if (ctg == null){
ctg = new ArrayList<>();
contatosCollection.put(c.getArea(), ctg);
}
ctg.add(c);
}
}
}
增加導致錯誤的JSON解析類：
private static ArrayList<Contato> contatoList = new ArrayList<>();
public static ArrayList<Contato> parseJSON(String jsonString){
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray jsonArray = jsonObject.optJSONArray("medicos");
for (int i = 0; i < jsonArray.length(); i++){
JSONObject medicoObj = jsonArray.getJSONObject(i);
JSONObject end = medicoObj.getJSONObject("endereco");
JSONArray coord = end.getJSONArray("coord");
LatLng latLng = new LatLng(coord.getDouble(0), coord.getDouble(1));
JSONArray telefones = medicoObj.getJSONArray("telefone");
String[] tels = new String[telefones.length()];
for (int j = 0; i < telefones.length(); i++) {
tels[i] = telefones.get(i).toString();
}
Contato c = new Contato(
medicoObj.getString("area")
, medicoObj.getString("nome")
, end.getString("rua")
, Integer.parseInt(end.getString("numero"))
, end.getString("complemento")
, tels
, latLng
);
contatoList.add(c);
}
return contatoList;
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
您確定傳遞給適配器的數據沒有重複的值嗎？ –
是的..謝謝你，你讓我調試只是。我想瘋了，認爲問題是我的適配器，並沒有看着數組值。其實問題是ArrayList從JSON獲取數據時得到了重複。更改我的解析器代碼來檢查重複項，並且工作正常。將發佈答案。 –