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如何获得json数组的总数no？我想在json文件中获得tolal no的id，我们可以看到有两个id。因此，不要数两个应该是两个。如何获得json数组的总数？
总数不应该显示两个。因为在json中存在两个id。我们怎么能得到这个数字？ 在图像中看到我得到整个JSON。 但是我想要点击“引导”按钮后，只有两个“id”的总数没有。 lead.json
[
{
"id": "449876",
"First Name": "Govind",
"Middle Name" :"Shripatrao",
"Last Name":"Suryawanshi",
"City":"Gurgaon",
"Country":"India",
"Contact No":"+91 8586925935",
"email": "[email protected]",
"Budget":"Starting at ?1.7 Crores onwards",
"Project":" -",
"App Platform":"UtilityApp-Android",
"Source":"Organic",
"Campaign":"NA",
"Lead Time":"11/8/2015 2:51:32",
"IP Address":"182.64.13.180"
},
{
"id": "425676",
"First Name": "Karan",
"Middle Name" :"Singh",
"Last Name":"Rana",
"City":"Chandigarh",
"Country":"India",
"Contact No":"+91 9854563132",
"email": "[email protected]",
"Budget":"Starting at ?3.35 Crore onwards",
"Project":" Myst",
"App Platform":"UtilityApp-Android",
"Source":"Organic",
"Campaign":"NA",
"Lead Time":"9/15/2015 12:05:28",
"IP Address":"182.71.22.178"
}
]
主要活动
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import tatahousingleads.com.tatahousingleads.app.AppController;
public class MainActivity extends Activity {
// json array response url
private String urlJsonArry = "http://milagro.in/wip/apps/n/lead.json";
private static String TAG = MainActivity.class.getSimpleName();
private Button btnMakeObjectRequest, btnMakeArrayRequest;
// Progress dialog
private ProgressDialog pDialog;
private TextView txtResponse;
// temporary string to show the parsed response
private String jsonResponse;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// btnMakeObjectRequest = (Button) findViewById(R.id.btnObjRequest);
btnMakeArrayRequest = (Button) findViewById(R.id.btnArrayRequest);
txtResponse = (TextView) findViewById(R.id.txtResponse);
pDialog = new ProgressDialog(this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
btnMakeArrayRequest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// making json array request
makeJsonArrayRequest();
}
});
}
private void makeJsonArrayRequest() {
showpDialog();
JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
try {
// Parsing json array response
// loop through each json object
jsonResponse = "";
for (int i = 0; i < response.length(); i++) {
JSONObject lead = (JSONObject) response
.get(i);
String id = lead.getString("id");
String firstname = lead.getString("First Name");
String middname = lead.getString("Middle Name");
String lanme = lead.getString("Last Name");
String city =lead.getString("City");
String country =lead.getString("Country");
String contactno =lead.getString("Contact No");
String email = lead.getString("email");
String budget = lead.getString("Budget");
String project = lead.getString("Project");
String appplatform = lead.getString("App Platform");
jsonResponse += "Id: " + id + "\n\n";
jsonResponse += "First Name: " +firstname + "\n\n";
jsonResponse += "Middle Name: " + middname + "\n\n";
jsonResponse += "Last Name: " + lanme + "\n\n";
jsonResponse += "City: " + city + "\n\n";
jsonResponse += "Country: " + country + "\n\n";
jsonResponse += "Contact No: " + contactno + "\n\n";
jsonResponse += "Email: " + email + "\n\n";
jsonResponse += "Budget: " + budget + "\n\n";
jsonResponse += "Project: " + project + "\n\n";
jsonResponse += "App Platform : " + appplatform + "\n\n\n";
}
txtResponse.setText(jsonResponse);
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),
"Error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
hidepDialog();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
hidepDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(req);
}
private void showpDialog() {
if (!pDialog.isShowing())
pDialog.show();
}
private void hidepDialog() {
if (pDialog.isShowing())
pDialog.dismiss();
}
}
activity_main.xml中
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbarStyle="insideInset"
android:scrollbars="vertical" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnArrayRequest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:text="Leads"
/>
<TextView
android:id="@+id/txtResponse"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/btnArrayRequest"
android:layout_marginTop="20px"
android:padding="20dp" />
</LinearLayout>
</ScrollView>
JsonArray.length（）会给你JsonArray的长度。 –
请确定。解释你真正需要的。您已经使用response.length（）来获取长度。 – Ayyappan
response.length（）所有准备好给你。 – anonymous