如何将JSON字符串解析为ListView

Question

所以我开始编写Java Android程序，并试图解析我创建的JSON字符串。所以，我想把它解析成ListView，我需要人们来帮助我

我的实验JSON文件：

[ 
{ 
"HoTen":" Nguyu1ec5n Vu0103n A",
"NamSinh":1999,
"DiaChi":"Hu00e0 Nu1ed9i"
},
{+},
{+},
{+},
{+},
{+},
{+},
{+},
{+}
]

我的代码，但它不起作用：

protected void onPostExecute(String s) {
//Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
try {
mangLV = new ArrayList<String>();
JSONArray jsonArray = new JSONArray(s);
JSONObject jsonObject = new JSONObject(s);
for (int i =0;i<=jsonObject.length();i++)
{
JSONObject  object = jsonArray.getJSONObject(i);
//HoTen.getString("HoTen");
String HoTen = object.getString("HoTen");
int NamSinh = object.getInt("NamSinh");
String DiaChi = object.getString("DiaChi");
}
ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,mangLV);
lvSinhVien.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}

Answer 1

希望这将帮助您

protected void onPostExecute(String s) {
//Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
try {
ArrayList<String> mangLV = new ArrayList<String>();
JSONArray jsonArray = new JSONArray(s);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
//HoTen.getString("HoTen");
String HoTen = object.getString("HoTen");
int NamSinh = object.getInt("NamSinh");
String DiaChi = object.getString("DiaChi");
String result = String.format("HoTen: %s, NamSinh: %s, DiaChi: %s",
HoTen, NamSinh, DiaChi);
mangLV.add(result);
}
ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, mangLV);
lvSinhVien.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}

Answer 2

您似乎没有使用JSONObject jsonObject = new JSONObject(s);。您的for应该是for(int i = 0; i<=jsonArray.length();i++)，从而使您的jsonObject过时。此外，您正在向适配器传递一个空列表！您从未在mangLV列表中添加任何内容。

试试这个代码：

protected void onPostExecute(String s) {
//Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
try {
mangLV = new ArrayList<String>();
JSONArray jsonArray = new JSONArray(s);
for(int i = 0; i < jsonArray.length(); i++)
{
JSONObject object = jsonArray.getJSONObject(i);
String HoTen = object.getString("HoTen");
int NamSinh = object.getInt("NamSinh");
String DiaChi = object.getString("DiaChi");
String result = "HoTen " + HoTen + " | NamSinh " + NamSinh + " | DiaChi " + DiaChi;
mangLV.add(result);  //After fetching the values, add the objects to your list    
}
ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,mangLV);
lvSinhVien.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}

这应该会添加到您的ListView对象中，如下所示：

HoTen Nguyu1ec5n Vu0103n A | NamSinh 1999 | DiaChi Hu00e0 Nu1ed9i