如何使用volley将json文件解析成Listview
如何使用volley将json文件解析成Listview
提问于 2018-05-28 07:04:35
我正在做一个应用程序，我需要从互联网上获取一些数据，比如名称和电子邮件，我看了一些教程，关于如何使用volley来解析JSON文件，并从互联网上获取我的数据，这是可行的，但现在我想在ListView中显示一些数据( JSON文件中的所有名称)，但我的应用程序在运行时崩溃，以下是简化的代码：
public class MainActivity extends Activity {
// json array response url
private String urlJsonArry = "https://api.myjson.com/bins/1d60wu";
private String jsonResponse;
ListView nameList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
nameList = (ListView) findViewById(R.id.nameList);
JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
try {
ArrayList al = new ArrayList();
for (int i = 0; i < response.length(); i++) {
JSONObject person = (JSONObject) response
.get(i);
// al.add(response.get(i));
al.add(person.getString("name"));
}
ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, al);
nameList.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
// Adding request to request queue
RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
rQueue.add(req);
}}JSON代码
[
{
"name": "Ravi Tamada",
"email": "ravi8x@gmail.com",
"phone": {
"home": "08947 000000",
"mobile": "9999999999"
}
},
{
"name": "opeyemi sanusi",
"email": "rffddg@gmail.com",
"phone": {
"home": "08457 000000",
"mobile": "999944999"
}
},
{
"name": "james bond",
"email": "dfgdg@gmail.com",
"phone": {
"home": "05657 000000",
"mobile": "999944999"
}
},
{
"name": "Tommy",
"email": "tommy@gmail.com",
"phone": {
"home": "08946 000000",
"mobile": "0000000000"
}
}
]我只想在列表视图中显示每个数组中的名称，即- Ravi Tamada、opeyemi Sanusi、James bond等
回答 2
Stack Overflow用户
回答已采纳
发布于 2018-05-31 01:47:46
嗨，像下面这样替换你的请求代码，你就不会面临崩溃。我也签入了我的设备，现在我可以用数组填充listview了。你别忘了在清单中给出互联网的许可。
StringRequest req = new StringRequest(urlJsonArry,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
ArrayList al = new ArrayList();
JSONArray jsonArray = new JSONArray(response);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
if (jsonObject.has("name")) {
al.add(jsonObject.getString("name"));
}
}
ArrayAdapter adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, al);
nameList.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
// Adding request to request queue
RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
rQueue.add(req);Stack Overflow用户
发布于 2018-06-02 08:36:48
setContentView(R.layout.activity_main);失踪了
这段代码可以正常工作
package com.radline.radapp.radapp;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends Activity {
String urlJsonArry = "https://api.myjson.com/bins/1d60wu";
ListView nameList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nameList = (ListView) findViewById(R.id.nameList);
StringRequest req = new StringRequest(urlJsonArry,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
ArrayList al = new ArrayList();
JSONArray jsonArray = new JSONArray(response);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
if (jsonObject.has("name")) {
al.add(jsonObject.getString("name"));
}
}
ArrayAdapter adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, al);
nameList.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error", "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
// Adding request to request queue
RequestQueue rQueue = Volley.newRequestQueue(MainActivity.this);
rQueue.add(req);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50557293
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