以下是我的Main.java文件的代码：
package com.exampe.jsonoutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class Main extends Activity implements OnClickListener {
Button b;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initialization();
}
private void initialization() {
b = (Button) findViewById(R.id.button1);
b.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onClick(View arg0) {
try{
HttpParams httpparams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpparams, 10000);
HttpConnectionParams.setSoTimeout(httpparams, 10000);
HttpParams p = new BasicHttpParams();
p.setParameter("Id", 1);
HttpClient hc = new DefaultHttpClient();
String url = "http://localhost/Android%20Output/fetch.php";
HttpPost httppost = new HttpPost(url);
try{
Log.i(getClass().getSimpleName(), "Send task - Start");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("Id",1));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
ResponseHandler<String> responseHandler = new BasicResponseHandler();
String responseBody = hc.execute(httppost,
responseHandler);
// Parse
JSONObject json = new JSONObject(responseBody);
JSONArray jArray = json.getJSONArray("posts");
ArrayList<HashMap<String, String>> mylist =
new ArrayList<HashMap<String, String>>();
for (int i = 0; i < jArray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = jArray.getJSONObject(i);
String s = e.getString("post");
JSONObject jObject = new JSONObject(s);
map.put("Id", jObject.getString("Id"));
map.put("First Name", jObject.getString("F_Name"));
map.put("Middle Name", jObject.getString("M_Name"));
map.put("Last Name", jObject.getString("L_Name"));
mylist.add(map);
}
Toast.makeText(this, responseBody, Toast.LENGTH_LONG).show();
} catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
// Log.i(getClass().getSimpleName(), "send task - end");
} catch (Throwable t) {
Toast.makeText(this, "Request failed: " + t.toString(),
Toast.LENGTH_LONG).show();
}
}
}
该行
nameValuePairs.add(new BasicNameValuePair("Id",1));
导致错误消息The constructor BasicNameValuePair(String, int) is undefined
如何解决？
答案 0 :(得分：1)
您可以像这样使用asyncTask：
@Override
public void onClick(View arg0) {
new NetworkThread().execute();
}
public class NetworkThread extends AsyncTask<Void, Void, String>
{
@Override
protected String doInBackground(Void... params) {
String responseBody = "";
try{
HttpParams httpparams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpparams, 10000);
HttpConnectionParams.setSoTimeout(httpparams, 10000);
HttpParams p = new BasicHttpParams();
p.setParameter("Id", 1);
HttpClient hc = new DefaultHttpClient();
String url = "http://localhost/Android%20Output/fetch.php";
HttpPost httppost = new HttpPost(url);
try{
Log.i(getClass().getSimpleName(), "Send task - Start");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("Id","1"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
ResponseHandler<String> responseHandler = new BasicResponseHandler();
responseBody = hc.execute(httppost,
responseHandler);
// Parse
JSONObject json = new JSONObject(responseBody);
JSONArray jArray = json.getJSONArray("posts");
ArrayList<HashMap<String, String>> mylist =
new ArrayList<HashMap<String, String>>();
for (int i = 0; i < jArray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = jArray.getJSONObject(i);
String s = e.getString("post");
JSONObject jObject = new JSONObject(s);
map.put("Id", jObject.getString("Id"));
map.put("First Name", jObject.getString("F_Name"));
map.put("Middle Name", jObject.getString("M_Name"));
map.put("Last Name", jObject.getString("L_Name"));
mylist.add(map);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
// Log.i(getClass().getSimpleName(), "send task - end");
} catch (Throwable t) {
responseBody = "Request failed: ";
}
return responseBody;
}
@Override
protected void onPostExecute(String result) {
Toast.makeText( Main.this, result,
Toast.LENGTH_LONG).show();
super.onPostExecute(result);
}
}
答案 1 :(得分：0)
嗨，在nameValuePairs方法中都有两个字符串值，所以你必须将整数转换为字符串值。
Integer.toString(your_int_value);
使用此代码将整数转换为字符串