我想显示我朋友的列表。我不明白为什么String无法转换为json。我理解152（MainActivity）中的错误
JSONObject o = new JSONObject(response.toString());
但我不知道为什么......
JSONException: Value com.vk.sdk.api.VKResponse@42b49418 of type java.lang.String cannot be converted to JSONObject
在日志中，此响应显示响应：
{
"response": {
"count": 40,
"items": [{
"id": 10543136,
"first_name": "Филип",
"last_name": "Канна",
"sex": 2,
"city": {
"id": 1710959,
"title": "Кишинев"
},
"online": 0
}, ........
JSON如何看起来像VK服务器
response: {
count: 693,
items: [{
id: 1987761,
first_name: 'Александром',
last_name: 'Мирмильштейном',
sex: 2,
city: {
id: 60,
title: 'Казань'
},
online: 0
}, {
id: 153796,
first_name: 'Александром',
last_name: 'Москалюком',
sex: 2,
city: {
id: 1568,
title: 'Черновцы'
},
online: 0
}, {
id: 10741,
first_name: 'Александром',
last_name: 'Мынзой',
sex: 2,
city: {
id: 1,
title: 'Москва'
},
online: 0
}]
}
我的主要活动
public class MainActivity extends Activity {
TextView text;
getFriendTask task;
ListView listView1;
VKAccessToken token;
ArrayList<Friend> friendArrayList;
ArrayAdapter<Friend> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
VKUIHelper.onCreate(this);
VKSdk.initialize(listener, "4571964");
VKSdk.authorize(new String[]{"friends"});
text=(TextView)findViewById(R.id.txt);
}
public void FriendClick(View view) {
friendArrayList=new ArrayList<Friend>();
task=new getFriendTask();
task.execute();
listView1=(ListView)findViewById(R.id.list);
adapter=new FriendAdapter(getApplicationContext(), R.layout.friendlist, friendArrayList);
listView1.setAdapter(adapter);
}
class getFriendTask extends AsyncTask<Void, Void, Void> {
protected void onPostExecute(Void result){
super.onPostExecute(result);
adapter.notifyDataSetChanged();
}
@Override
protected Void doInBackground(Void... params) {
if(listener!=null) {
VKRequest request = new VKRequest("friends.get", VKParameters.from(VKApiConst.FIELDS, "first_name, last_name, sex, bdate, city"));
request.start();
request.executeWithListener(new VKRequest.VKRequestListener() {
@Override
public void onComplete(VKResponse response) {
super.onComplete(response);
Toast.makeText(MainActivity.this, response.responseString, Toast.LENGTH_LONG).show();
try{
JSONObject o = new JSONObject(response.toString());
JSONArray jsonArray = o.getJSONArray("response");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Friend fr = new Friend();
fr.setFirst_name(jsonObject.getString("first_name"));
fr.setLast_name(jsonObject.getString("last_name"));
fr.setSex(jsonObject.getString("sex"));
fr.setBdate(jsonObject.getString("bdate"));
fr.setCity(jsonObject.getString("city"));
friendArrayList.add(fr);
}
}catch (JSONException e){
e.printStackTrace();
}
Log.i("Are You Ready???", "Response - "+response.responseString);
}
@Override
public void onError(VKError error) {
super.onError(error);
Log.i("Are You Ready to Fly???", "EEEror - "+error.errorMessage);
}
@Override
public void attemptFailed(VKRequest request, int attemptNumber, int totalAttempts) {
super.attemptFailed(request, attemptNumber, totalAttempts);
}
});
}
return null;
}
}
VKSdkListener listener=new VKSdkListener() {
@Override
public void onCaptchaError(VKError vkError) {
}
@Override
public void onTokenExpired(VKAccessToken vkAccessToken) {
}
@Override
public void onAccessDenied(VKError vkError) {
Log.d("Gooooo", " My error - "+vkError.errorMessage);
}
public void onReceiveNewToken(VKAccessToken newToken){
Log.d("Gooooo", "My token - "+newToken.accessToken);
token=newToken;
}
};
@Override
protected void onResume() {
super.onResume();
VKUIHelper.onResume(this);
}
@Override
protected void onDestroy() {
super.onDestroy();
VKUIHelper.onDestroy(this);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
VKUIHelper.onActivityResult(requestCode, resultCode, data);
}
public void onAutoClick(View view) {
}}
我的模特朋友
class Friend{
String first_name;
String last_name;
String sex;
String bdate;
String city;
public Friend(){}
public Friend(String first_name, String last_name, String sex, String bdate, String city){
super();
this.first_name=first_name;
this.last_name=last_name;
this.sex=sex;
this.bdate=bdate;
this.city=city;
}
public String getFirst_name(){
return first_name;
}
public void setFirst_name(String first_name){
this.first_name=first_name;
}
public String getLast_name(){
return last_name;
}
public void setLast_name(String last_name){
this.last_name=last_name;
}
public String getSex(){
return sex;
}
public void setSex(String sex){
this.sex=sex;
}
public String getBdate(){
return bdate;
}
public void setBdate(String bdate){
this.bdate=bdate;
}
public String getCity(){
return city;
}
public void setCity(String city){
this.city=city;
}
}
My FriendAdapter
public class FriendAdapter extends ArrayAdapter<Friend> {
ArrayList<Friend> friendArrayList;
LayoutInflater inflater;
int Resource;
ViewHolder holder = new ViewHolder();
public FriendAdapter(Context context, int resource, ArrayList<Friend> objects) {
super(context, resource, objects);
inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource=resource;
friendArrayList=objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
View view=convertView;
if(view==null){
holder=new ViewHolder();
view=inflater.inflate(Resource, null);
holder.name=(TextView)view.findViewById(R.id.fname);
holder.laname=(TextView)view.findViewById(R.id.lname);
holder.s=(TextView)view.findViewById(R.id.sx);
holder.b=(TextView)view.findViewById(R.id.bd);
holder.c=(TextView)view.findViewById(R.id.ct);
view.setTag(holder);
}else{
holder=(ViewHolder) view.getTag();
}
holder.name.setText(friendArrayList.get(position).getFirst_name());
holder.laname.setText(friendArrayList.get(position).getLast_name());
holder.s.setText(friendArrayList.get(position).getSex());
holder.b.setText(friendArrayList.get(position).getBdate());
holder.c.setText(friendArrayList.get(position).getCity());
return view;
}
static class ViewHolder {
public TextView name;
public TextView laname;
public TextView s;
public TextView b;
public TextView c;
} }
错误
10-25 22:57:33.130 31812-31812/standandroid.ru.vktestapi W/System.err﹕ org.json.JSONException: Value com.vk.sdk.api.VKResponse@42b40ac0 of type java.lang.String cannot be converted to JSONObject
10-25 22:57:33.130 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at org.json.JSON.typeMismatch(JSON.java:111)
10-25 22:57:33.130 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:158)
10-25 22:57:33.130 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:171)
10-25 22:57:33.140 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at standandroid.ru.vktestapi.MainActivity$getFriendTask$1.onComplete(MainActivity.java:152)
10-25 22:57:33.140 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at com.vk.sdk.api.VKRequest$3.run(VKRequest.java:459)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:730)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:92)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at android.os.Looper.loop(Looper.java:137)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5137)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:525)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:756)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:572)
10-25 22:57:33.150 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at miui.dexspy.DexspyInstaller.main(DexspyInstaller.java:171)
10-25 22:57:33.160 31812-31812/standandroid.ru.vktestapi W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)
10-25 22:57:33.160 31812-31812/standandroid.ru.vktestapi I/Are You Ready???﹕ Response - {"response":{"count":40,"items":[{"id":10543136,"first_name":"Филип","last_name":"Канна","sex":2,"city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":12567913,"first_name":"Юлия","last_name":"Мурашева","sex":1,"bdate":"4.4","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":15349233,"first_name":"Алёна","last_name":"Волкова","sex":1,"bdate":"31.3","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":15890365,"first_name":"Алиса","last_name":"Голдур","sex":1,"bdate":"25.2","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":17445476,"first_name":"Лена","last_name":"Стурза","sex":1,"bdate":"6.3.1995","online":1},{"id":20855237,"first_name":"Никита","last_name":"Чукля","sex":2,"online":1},{"id":22441902,"first_name":"Максим","last_name":"Чакир","sex":2,"bdate":"4.1.1994","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":23260033,"first_name":"Катя","last_name":"Кузьмина","sex":1,"bdate":"27.6.1994","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":24891252,"first_name":"Арина","last_name":"Горобец","sex":1,"bdate":"20.12.1994","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":33387222,"first_name":"Алёна","last_name":"Миколюк","sex":1,"bdate":"14.10","city":{"id":292,"title":"Одесса"},"online":1},{"id":38467274,"first_name":"Андрей","last_name":"Тросиненко","sex":2,"bdate":"19.3","online":0},{"id":38733273,"first_name":"Миха","last_name":"Романчук","sex":1,"bdate":"2.6.1937","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":39117080,"first_name":"Рома","last_name":"Беженарь","sex":2,"bdate":"14.10","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":45171519,"first_name":"Александр","last_name":"Огурцов","sex":2,"bdate":"22.6.1994","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":47147705,"first_name":"Никита","last_name":"Драгуцану","sex":2,"bdate":"28.12","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":58606740,"first_name":"Франческа","last_name":"Канна","sex":1,"bdate":"25.1","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":62678153,"first_name":"Лёша","last_name":"Кугут","sex":2,"city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":67485434,"first_name":"Ирина","last_name":"Трапезникова","sex":1,"bdate":"15.7","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":76249958,"first_name":"Никита","last_name":"Литвинов","sex":2,"online":1},{"id":78574119,"first_name":"Женя","last_name":"Чередниченко","sex":2,"city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":87816032,"first_name":"Саша","last_name":"Сергунин","sex":2,"bdate":"28.5.1994","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":91235673,"first_name":"Вадим","last_name":"Барский","sex":2,"bdate":"22.6.1994","city":{"id":1908479,"title":"Antananarivo"},"online":1},{"id":94373404,"first_name":"Никита","last_name":"Головко","sex":2,"bdate":"29.1","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":101047911,"first_name":"Алексей","last_name":"Кицак","sex":2,"bdate":"12.5","city":{"id":1710959,"title":"Кишинев"},"online":1},{"id":101208573,"first_name":"Глеб","last_name":"Глинянов","deactivated":"deleted","sex":2,"online":0},{"id":108330289,"first_name":"Саша","last_name":"Руденко","sex":2,"bdate":"16.6","online":0},{"id":129188949,"first_name":"Роман","last_name":"Бугаян","sex":2,"city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":139584680,"first_name":"Кристиан","last_name":"Мбала","sex":2,"bdate":"10.6","city":{"id":1710959,"title":"Кишинев"},"online":0},{"id":154083054,"first_name":"Оля","last_name":"За
答案 0 :(得分：2)
此
JSONObject o = new JSONObject(response.toString());
应该是这样的：
JSONObject o = new JSONObject(response.responseString);
因为您正在尝试将对象转换为字符串。它的toString方法将返回com.vk.sdk.api.VKResponse@42b40ac0，而不是json。
修改 简单地说：
您的JSON是一个对象。所以你可以先解析它：JSONObject o = new JSONObject(response.toString());。如果你想得到所有的朋友，你需要迭代它里面的数组。
为此你可以这样做：
JSONArray jsonArray = o.getJSONArray("items"); //the array is "items" not response.
for (int i = 0; i < jsonArray.length(); i++) { //simple iteration
JSONObject jsonObject = jsonArray.getJSONObject(i); //this contains 1 item
Friend fr = new Friend();
fr.setFirst_name(jsonObject.getString("first_name"));
fr.setLast_name(jsonObject.getString("last_name"));
fr.setSex(jsonObject.getString("sex")); //sex is an integer so you might want to change this
//fr.setBdate(jsonObject.getString("bdate"));//there is no such field "bdate" on this json
fr.setCity(jsonObject.getJSONObject("city").getString("title")); //city is an object. Not a string
friendArrayList.add(fr);
}
这是简单的JSON解析，您应该能够自己完成。您可能无法理解您可能想要开始阅读一些教程背后的结构。这是一个很好的起点：http://www.javacodegeeks.com/2013/10/android-json-tutorial-create-and-parse-json-data.html