Android 错误:Json解析错误:无法将java.lang.String类型的值连接转换为JSONObject
我在我的listactivity中没有得到Json响应。我尝试了所有方法,但都没有显示结果。在logcat中,我获得了成功的连接,并且可以看到数据。但是在我的listview中,它显示了此异常。 这是我的密码Android 错误:Json解析错误:无法将java.lang.String类型的值连接转换为JSONObject,android,json,jsonexception,Android,Json,Jsonexception,我在我的listactivity中没有得到Json响应。我尝试了所有方法,但都没有显示结果。在logcat中,我获得了成功的连接,并且可以看到数据。但是在我的listview中,它显示了此异常。 这是我的密码 public class TypeMenu extends AppCompatActivity { private String TAG = TypeMenu.class.getSimpleName(); private ProgressDialog pDialog; private
public class TypeMenu extends AppCompatActivity {
private String TAG = TypeMenu.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = "http://cloud.granddubai.com/brtemp/index.php";
ArrayList<HashMap<String, String>> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_type_menu);
contactList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new GetContacts().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class GetContacts extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(TypeMenu.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
Toast.makeText(getApplicationContext(),
"Toast",
Toast.LENGTH_LONG)
.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray contacts = jsonObj.getJSONArray("menu_type");
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
String id = c.getString("id");
String type = c.getString("type");
//String email = c.getString("email");
// String address = c.getString("address");
// String gender = c.getString("gender");
// Phone node is JSON Object
//JSONObject phone = c.getJSONObject("phone");
//String mobile = phone.getString("mobile");
// String home = phone.getString("home");
// String office = phone.getString("office");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", type);
//contact.put("email", email);
//contact.put("mobile", mobile);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
TypeMenu.this, contactList,
R.layout.list_item, new String[]{"id", "type"}, new int[] {R.id.id,
R.id.type});
lv.setAdapter(adapter);
}
}
}
公共类类型菜单扩展AppCompative活动{
私有字符串标记=TypeMenu.class.getSimpleName();
私人对话;
私有ListView lv;
//获取联系人JSON的URL
专用静态字符串url=”http://cloud.granddubai.com/brtemp/index.php";
ArrayList联系人列表;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity类型菜单);
contactList=新的ArrayList();
lv=(ListView)findViewById(R.id.list);
新建GetContacts().execute();
}
/**
*异步任务类通过HTTP调用获取json
*/
私有类GetContacts扩展异步任务{
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
//显示进度对话框
pDialog=新建进度对话框(TypeMenu.this);
setMessage(“请稍候…”);
pDialog.setCancelable(假);
pDialog.show();
Toast.makeText(getApplicationContext(),
“敬酒”,
吐司长度(长)
.show();
}
@凌驾
受保护的Void doInBackground(Void…arg0){
HttpHandler sh=新的HttpHandler();
//向url发出请求并获得响应
字符串jsonStr=sh.makeServiceCall(url);
Log.e(标签,“来自url的响应:+jsonStr”);
if(jsonStr!=null){
试一试{
JSONObject jsonObj=新的JSONObject(jsonStr);
//获取JSON数组节点
JSONArray contacts=jsonObj.getJSONArray(“菜单类型”);
//通过所有触点循环
对于(int i=0;ivalue
联系人:put(“id”,id);
联系人。输入(“姓名”,类型);
//联系方式。放置(“电子邮件”,电子邮件);
//联系人:put(“mobile”,mobile);
//将联系人添加到联系人列表
联系人列表。添加(联系人);
}
}捕获(最终JSONException e){
Log.e(标记“Json解析错误:”+e.getMessage());
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Toast.makeText(getApplicationContext(),
Json分析错误:“+e.getMessage(),
吐司长度(长)
.show();
}
});
}
}否则{
e(标记“无法从服务器获取json”);
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
Toast.makeText(getApplicationContext(),
“无法从服务器获取json。请检查LogCat以了解可能的错误!”,
吐司长度(长)
.show();
}
});
}
返回null;
}
@凌驾
受保护的void onPostExecute(void结果){
super.onPostExecute(结果);
//关闭进度对话框
if(pDialog.isShowing())
pDialog.disclose();
/**
*将解析的JSON数据更新到ListView中
* */
ListAdapter=新的SimpleAdapter(
TypeMenu.this,contactList,
R.layout.list_项,新字符串[]{“id”,“type”},新int[]{R.id.id,
R.id.type});
低压设置适配器(适配器);
}
}
}
这是我的logcat味精
12-15 14:25:26.092 549-962/com.example.zass.brocoli E/TypeMenu:
来自url的响应:连接
成功[{“id”:“1”,“type”:“pizza”},{“id”:“8”,“type”:“Special”
提供{“id”:“2”,“type”:“面食”},{“id”:“7”,“type”:“汤”},{“id”:“6”,“type”:“饮料”},{“id”:“5”,“type”:“早餐”},{“id”:“3”,“type”:“千层面”},{“id”:“4”,“type”:“沙拉”}]
12-15 14:25:26.092 549-962/com.example.zass.broccoli E/TypeMenu:Json解析错误:无法连接java.lang.String类型的值
将转换为JSONObject
这是我希望在listview中显示的url的输出
[{“id”:“1”,“type”:“pizza”},{“id”:“8”,“type”:“特价”},{“id”:“6”,“type”:“饮料”},{“id”:“5”,“type”:“早餐”},{“id”:“3”,“type”:“千层面”},{“id”:“4”,“type”:“沙拉”}]
这是我的json文件,它在服务器上运行良好
这是我的list_item.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/id"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/type"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
编辑了一些代码,请尝试下面的代码
try {
JSONArray jsonArry = new JSONArray(jsonStr);
// looping through All Contacts
for (int i = 0; i < jsonArry.length(); i++) {
JSONObject c = jsonArry.getJSONObject(i);
String id = c.getString("id");
String type = c.getString("type");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", type);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
试试看{
JSONArray jsonArry=新JSONArray(jsonStr);
//通过所有触点循环
for(int i=0;i try {
JSONArray jsonArry = new JSONArray(jsonStr);
// looping through All Contacts
for (int i = 0; i < jsonArry.length(); i++) {
JSONObject c = jsonArry.getJSONObject(i);
String id = c.getString("id");
String type = c.getString("type");
// tmp hash map for single contact
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", id);
contact.put("name", type);
// adding contact to contact list
contactList.add(contact);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
JSONArray jsonArry = new JSONArray(jsonStr);
for (int i = 0; i < jsonArry.length(); i++) {
JSONObject c = jsonArry.getJSONObject(i);
String id = c.getString("id");
String type = c.getString("type");
HashMap<String, String> contact = new HashMap<>();
contact.put("id", id);
contact.put("name", type);
contactList.add(contact);
}
ListAdapter adapter = new SimpleAdapter(
TypeMenu.this, contactList,
R.layout.list_item, new String[]{"id", "type"}, new int[] {R.id.id,
R.id.type});
ListAdapter adapter = new SimpleAdapter(
TypeMenu.this, contactList,
R.layout.list_item, new String[]{"id", "name"}, new int[] {R.id.id,
R.id.type});
<?php
include ('config.php');
$id = $_GET['id'];
$sql = mysqli_query($conn,"SELECT * FROM menu_type ");
$response['details'] = array();
$i=0;
while($result = mysqli_fetch_array($sql))
{
$arr['id']= $result['id'];
$arr['type']= $result['type'];
array_push($response['details'],$arr);
}
echo json_encode($response);
?>
JSONObject jsonObj = new JSONObject(jsonStr);
JSONArray detailArray = jsonObj.optJSONArray("details");
for (int i = 0; i < detailArray.length(); i++) {
JSONObject c = detailArray.getJSONObject(i);
String id = c.getString("id");
String type = c.getString("type");
HashMap<String, String> contact = new HashMap<>();
contact.put("id", id);
contact.put("name", type);
contactList.add(contact);
}