我成功地从URL解析了数据，但是我无法解析内部数组中的数据。
我应该怎样做才能使用JSON解析从数组内部的数组中解析数据？
以下是我的代码：
public class MainActivity extends Activity {
private ProgressDialog pDialog;
// URL to get contacts JSON
private static String url = "http://docs.blackberry.com/sampledata.json";
private static final String TAG_vehicleType = "vehicalType";
private static final String TAG_vehicleColor = "vehicleColor";
private static final String TAG_Fuel = "fuel";
private static final String TAG_Name = "name";
private static final String TAG_ExperiencePoints = "experiencePoints";
private static final String TAG_TREADTYPE = "treadType";
// Hashmap for ListView
ArrayList<Vehical> contactList;
String name, exp;
ListView list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<Vehical>();
list = (ListView) findViewById(R.id.listView1);
// Calling async task to get json
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler sh = new ServiceHandler();
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONArray contacts = new JSONArray(jsonStr);
Log.d("contacts: ", "> " + contacts);
Log.d("contacts size: ", "> " + contacts.length() + "");
for (int j = 0; j < contacts.length(); j++) {
JSONObject c = contacts.getJSONObject(j);
String fuel = c.getString(TAG_Fuel);
String vehicleType = c.getString("vehicleType");
String vehicleColor = c.getString("vehicleColor");
String treadType = c.getString("treadType");
JSONArray approvedarray = c
.getJSONArray("approvedOperators");
ArrayList<ApprovedOperators> op = new ArrayList<ApprovedOperators>();
for (int i = 0; i < approvedarray.length(); i++) {
JSONObject d = approvedarray.getJSONObject(i);
String name = d.getString(TAG_Name);
int exp = d.getInt(TAG_ExperiencePoints);
op.add(new ApprovedOperators(name, exp));
// exp = c1.getString(TAG_exp);
}
Vehical contact = new Vehical(vehicleType,
vehicleColor, fuel, treadType, op);
contactList.add(contact);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
list.setAdapter(new CustomAdapter(MainActivity.this, contactList));
}
}}
这是我的CustomAdapter课程：
public class CustomAdapter extends BaseAdapter{
Activity context;
ArrayList<Vehical>arrayList;
LayoutInflater inflater;
public CustomAdapter(Context context ,ArrayList<Vehical>Arraylist){
this.context = (Activity)context;
this.arrayList = Arraylist;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return arrayList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return arrayList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
convertView = inflater.inflate(R.layout.list_item, parent,false);
TextView Type =(TextView)convertView.findViewById(R.id.type);
TextView color =(TextView)convertView.findViewById(R.id.color);
TextView fuel =(TextView)convertView.findViewById(R.id.fuel);
TextView treadType =(TextView)convertView.findViewById(R.id.textviewname);
Type.setText(arrayList.get(position).getVehicleType());
color.setText(arrayList.get(position).getVehicleColor());
fuel.setText(arrayList.get(position).getFuel());
treadType.setText(arrayList.get(position).getTreadType());
// TODO Auto-generated method stub
return convertView;
}
}
答案 0 :(得分：0)
制作服务处理程序类，而不是使用以下代码
公共类MainActivity扩展了Activity {
// new url
// String url = "http://demo.mysamplecode.com/Servlets_JSP/CountryJSONData";
private ProgressDialog pDialog;
// URL to get JSON Contacts
private static String url = "http://docs.blackberry.com/sampledata.json";
// JSON Node names
private static final String TAG_CONTACTS = "approvedOperators";
private static final String TAG_VEICHLETYPE = "vehicleType";
private static final String TAG_VEHICLECOLOR = "vehicleColor";
private static final String TAG_FUEL = "fuel";
String name;
String experiencePoints;
CustomAdapter Adapter;
Context context;
ListView listview;
TextView textView;
// Contacts JSONArray
JSONArray Contacts = null;
JSONArray approvedOperators = null;
ArrayList<VehicleItem> vehicleDetailList;
ArrayList<OperaterItems> operatorDataList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
vehicleDetailList = new ArrayList<VehicleItem>();
operatorDataList = new ArrayList<OperaterItems>();
context = this;
listview = (ListView) findViewById(R.id.listview);
//textView = (TextView)findViewById(R.id.textView);
// Calling async task to get Json
new GetContacts().execute();
/*listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> ADAPTER, View view, int position,
long id) {
// TODO Auto-generated method stub
String NAME = null, EXPERIENCE = null ;
ArrayList<OperaterItems> secondList = vehicleDetailList.get(position).getOperatorDataList();
for(int i = 0; i < secondList.size(); i++){
OperaterItems items = new OperaterItems();
NAME += secondList.get(i).getName();
EXPERIENCE += secondList.get(i).getExperiencePoints();
name="";
name+= "Name:"+NAME+"\n";
name+="Experience: "+EXPERIENCE+"\n";
textView.setText(name);
}
Toast.makeText(context,
"NAME ON CLICKED POSITION..."+position+"\n"+NAME+"\n EXPERIENCE"+"\n"+EXPERIENCE,
Toast.LENGTH_LONG).show();
}
});*/
}
private class GetContacts extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
super.onPreExecute();
// Showing Progress Dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please Wait...");
pDialog.setCancelable(false);
pDialog.show();
}
protected Void doInBackground(Void... arg0) {
// Creating ServiceHandeler Class instance
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
String jsonstr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Responce:", ">" + jsonstr);
if (jsonstr != null) {
// vehicleDetailList = new ArrayList<VehicleItem>();
// ArrayList<OperaterItems> operatorDataList;
try {
JSONArray Contacts = new JSONArray(jsonstr);
// looping through all contacts
for (int i = 0; i < Contacts.length(); i++) {
JSONObject c = Contacts.getJSONObject(i);
VehicleItem vehiclesItem = new VehicleItem();
vehiclesItem.setVehicleType(c.getString("vehicleType"));
vehiclesItem.setVehicleColor(c
.getString("vehicleColor"));
vehiclesItem.setFuel(c.getString("fuel"));
vehiclesItem.setTreadType(c.getString("treadType"));
Log.d("FIRST DATA........", "vehicleType" + "\n"
+ "vehicleColor" + "\n" + "fuel" + "\n"
+ "treadType");
JSONArray approvedOperators = c
.getJSONArray("approvedOperators");
ArrayList<OperaterItems> operatorDataList = new ArrayList<OperaterItems>();
for (int j = 0; j < approvedOperators.length(); j++) {
JSONObject b = approvedOperators.getJSONObject(j);
OperaterItems operatersItem = new OperaterItems();
operatersItem.setName(b.getString("name"));
operatersItem.setExperiencePoints(b
.getString("experiencePoints"));
Log.d("dg......", "opName" + "\n" + "opexp");
operatorDataList.add(operatersItem);
// vehiclesItem.setOperatorDataList(operatorDataList);
// String opName = b.getString("name");
// String opexp = b.getString("experiencePoints");
// hashmap.put(i, opName);
// Log.d(i+"",opName+"");
}
vehiclesItem.setOperatorDataList(operatorDataList);
vehicleDetailList.add(vehiclesItem);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Coludn't get any data from url");
}
return null;
}
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress Dialog
if (pDialog.isShowing())
pDialog.dismiss();
CustomAdapter apdapter = new CustomAdapter(context,
vehicleDetailList);
listview.setAdapter(apdapter);
// vehicleDetailList.get(0).getOperatorDataList().get(0).getName();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
公共类CustomAdapter扩展了BaseAdapter {
Activity context;
ArrayList<OperaterItems> operatorDataList;
ArrayList<VehicleItem>vhlist;
LayoutInflater inflater;
/*public CustomAdapter(ArrayList<OperaterItems>oplist,Context context){
this.context1 = (Activity)context1;
this. operatorDataList = oplist;
}*/
public CustomAdapter(Context context,ArrayList<VehicleItem>vlist){
this.context = (Activity)context;
this.vhlist = vlist;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return vhlist.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return vhlist.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = context.getLayoutInflater();
convertView = inflater.inflate(R.layout.list_item, parent,false);
LinearLayout linearLayout = (LinearLayout)convertView.findViewById(R.id.customLinearLayout);
TextView vehicleType = (TextView)convertView.findViewById(R.id.vehicleType);
TextView vehiclecolor = (TextView)convertView.findViewById(R.id.vehicleColor);
TextView fuel = (TextView)convertView.findViewById(R.id.fuel);
TextView treadType = (TextView)convertView.findViewById(R.id.treadType);
TextView objname = (TextView)convertView.findViewById(R.id.name);
TextView exp = (TextView)convertView.findViewById(R.id.exp);
//VehicleItem veItem = new VehicleItem();
vehicleType.setText(vhlist.get(position).getVehicleType());
vehiclecolor.setText(vhlist.get(position).getVehicleColor());
fuel.setText(vhlist.get(position).getFuel());
treadType.setText(vhlist.get(position).getTreadType());
//objname.setText(vhlist.get(position).g)
//OperaterItems items = new OperaterItems();
ArrayList<OperaterItems> opList = vhlist.get(position).getOperatorDataList();
for(int i = 0; i < opList.size(); i++){
TextView tv = new TextView(context);
tv.setText(opList.get(i).getName());
tv.setTextColor(context.getResources().getColor(android.R.color.holo_red_dark));
TextView tv2 = new TextView(context);
tv2.setText(opList.get(i).getExperiencePoints());
tv2.setTextColor(context.getResources().getColor(android.R.color.holo_purple));
linearLayout.addView(tv);
linearLayout.addView(tv2);
//vhlist.aa
}
// objname.setText（vhlist.get（position）.getOperatorDataList（）。get）; // exp.setText（operatorDataList.get（position）.getExperiencePoints（））;
return convertView;
}
}
public class OperaterItems {
private String name, experiencePoints;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getExperiencePoints() {
return experiencePoints;
}
public void setExperiencePoints(String experiencePoints) {
this.experiencePoints = experiencePoints;
}
}
public class VehicleItem {
private String vehicleType, vehicleColor, fuel, treadType;
private ArrayList<OperaterItems> operatorDataList;
public ArrayList<OperaterItems> getOperatorDataList() {
return operatorDataList;
}
public void setOperatorDataList(ArrayList<OperaterItems> operatorDataList) {
this.operatorDataList = operatorDataList;
}
public String getVehicleType() {
return vehicleType;
}
public void setVehicleType(String vehicleType) {
this.vehicleType = vehicleType;
}
public String getVehicleColor() {
return vehicleColor;
}
public void setVehicleColor(String vehicleColor) {
this.vehicleColor = vehicleColor;
}
public String getFuel() {
return fuel;
}
public void setFuel(String fuel) {
this.fuel = fuel;
}
public String getTreadType() {
return treadType;
}
public void setTreadType(String treadType) {
this.treadType = treadType;
}
}