如何将可扩展列表视图转换为列表视图，并在Android中将回收列表视图作为子视图
并显示类似Google Play商店。
如何将可扩展列表视图转换为列表视图..... 我需要您的帮助来解决我的问题。 sample
这是json：
{
"category": [
{
"id": "23",
"category_name": "Sports",
"category_image": "avenger,jpg",
"sub_category": [
{
"id": "6",
"name": "Cricket"
},
{
"id": "9",
"name": "footbal"
}
]
},
{
"id": "24",
"category_name": "General Knowledge",
"category_image": "|avengers.jpg",
"sub_category": [
{
"id": "5",
"name": "Science"
}
]
},
]
}
这是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, 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, 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;
}
}
这是JsonParser：
public class JSONParser {
public JSONParser() {
}
public String makeServiceCall(String serviceUrl) {
Boolean registered = false;
StringBuffer response = new StringBuffer();
URL url = null;
HttpURLConnection conn = null;
try {
url = new URL(serviceUrl);
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(30000);
conn.setDoOutput(false);
conn.setUseCaches(false);
conn.setRequestMethod("GET");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded;charset=UTF-8");
int status = conn.getResponseCode();
if (status != 200) {
throw new IOException("Post failed with error code " + status);
}
registered = true;
// Get Response
InputStream is = conn.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = rd.readLine()) != null) {
response.append(line);
}
rd.close();
} catch (Exception e) {
e.printStackTrace();
/* ErrorLogger.writeLog(claimNo, "Error Msg : "+e.getMessage()+"..."+ErrorLogger.StackTraceToString(e), "sendSyncService Failed");
response.append("Error");*/
}
Log.v("Response:", response.toString());
return response.toString();
}
}
这是主要作用力：
public class Main2Activity extends AppCompatActivity {
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
private ProgressDialog mprocessingdialog;
private static String url = "http://10.0.2.2/quiz/13.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
mprocessingdialog = new ProgressDialog(this);
// get the listview
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
new DownloadJason().execute();
}
private class DownloadJason extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
// Showing Progress dialog
mprocessingdialog.setTitle("Please Wait..");
mprocessingdialog.setMessage("Loading");
mprocessingdialog.setCancelable(false);
mprocessingdialog.setIndeterminate(false);
mprocessingdialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
// TODO Auto-generated method stub
JSONParser jp = new JSONParser();
String jsonstr = jp.makeServiceCall(url);
Log.d("Response = ", jsonstr);
if (jsonstr != null) {
// For Header title Arraylist
listDataHeader = new ArrayList<String>();
// Hashmap for child data key = header title and value = Arraylist (child data)
listDataChild = new HashMap<String, List<String>>();
try {
JSONObject jsonObject = new JSONObject(jsonstr);
JSONArray dataArray = jsonObject.getJSONArray("category");
for(int i=0;i<dataArray.length();i++)
{
JSONObject internalObject = dataArray.getJSONObject(i);
listDataHeader.add(internalObject.getString("category_name"));
JSONArray jsonArray = internalObject.getJSONArray("sub_category");
ArrayList<String> subCategoryList = new ArrayList<>();
for(int j=0;j<jsonArray.length();j++)
{
subCategoryList.add(jsonArray.getJSONObject(j).getString("name"));
}
listDataChild.put(listDataHeader.get(i),subCategoryList);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(),
"Please Check internet Connection", Toast.LENGTH_SHORT)
.show();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
mprocessingdialog.dismiss();
//call constructor
listAdapter = new ExpandableListAdapter(getApplicationContext(), listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
}
}