这是我的 PHP 文件，它需要从 android 接收分类变量，然后使用它可以从数据库中提取特定数据：
php
include('connect.php');
$asortid=$_POST['asortid'];
$asortlastname=$_POST['asortlastname'];
$asortemail=$_POST['asortemail'];
$afilter = $_POST['afilter'];
if ($afilter=='') { $asorturgency="5"}
if ($afilter!='') {
// SET FILTERS
if ($asortid=='' || $asortid=='All ID') { $mysortid="%"; } else{
$mysortid="%".$asortid."%";
}
if ($asortemail=='' || $asortemail=='Any Email') {
$mysortemail="%"; } else {
$mysortemail="%".$asortemail."%"; }
// MASTER RESULT QUERY
$query=mysql_query("SELECT * FROM names WHERE (id LIKE '".$mysortid."') AND (email LIKE '".$mysortemail."');
//execute query
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
// Finally, we can retrieve all of the found rows into an array using fetchAll
$rows = $stmt->fetchAll();
if ($rows) {
$response["success"] = 1;
$response["message"] = "Post Available!";
$response["posts"] = array();
foreach ($rows as $row) {
$post = array();
$post["id"] = $row["id"];
$post["firstname"] = $row["firstname"];
$post["middlename"] = $row["middlename"];
$post["lastname"] = $row["lastname"];
$post["email"] = $row["email"];
$post["comments"] = $row["comments"];
//update our repsonse JSON data
array_push($response["posts"], $post);
}
//echoing JSON response
echo json_encode($response);
}
else {
$response["success"] = 0;
$response["message"] = "No Post Available!";
die(json_encode($response));
}
这是我尝试发送要读取的帖子数据的android文件：
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
public class Display extends ListActivity {
// Progress Dialog
private ProgressDialog tDialog;
JSONParser myjsonParser = new JSONParser();
private static final String SORTNAMES = "http://leadpronow.com/demo/sortnames.php";
String sortid, sortname, sorturgency, filtered;
// JSON IDS:
private static final String TAG_DPOSTS = "posts";
private static final String TAG_DID = "id";
private static final String TAG_DFIRSTNAME = "firstname";
private static final String TAG_DMIDDLENAME = "middlename";
private static final String TAG_DLASTNAME = "lastname";
private static final String TAG_DEMAIL = " email";
private static final String TAG_DCOMMENTS = "comments";
// An array of all of our leads
private JSONArray mName = null;
// manages all of our comments in a list.
private ArrayList<HashMap<String, String>> mNameList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// note that use read_comments.xml instead of our single_post.xml
setContentView(R.layout.readpost);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
// loading the comments via AsyncTask
new LoadNames().execute();
}
public void updateJSONdata() {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(SORTNAMES);
try {
Intent in = getIntent();
filtered = in.getStringExtra("filtered");
sortid = in.getStringExtra("sortid");
sortemail = in.getStringExtra("sortemail");
sorturgency = in.getStringExtra("sorturgency");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair> (4);
nameValuePairs.add(new BasicNameValuePair("afilter", filtered));
nameValuePairs.add(new BasicNameValuePair("asortid", sortid));
nameValuePairs.add(new BasicNameValuePair("asortemail",sortemail));
nameValuePairs.add(new BasicNameValuePair("asorturgency",sorturgency));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse httpresponse = httpclient.execute(httppost);
} catch (ClientProtocolException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
mNamesList = new ArrayList<HashMap<String, String>>();
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(SORTNAMES);
try {
mLeads = json.getJSONArray(TAG_DPOSTS);
// looping through all posts according to the json object returned
for (int i = 0; i < mLeads.length(); i++) {
JSONObject c = mLeads.getJSONObject(i);
// gets the content of each tag
String did = c.getString(TAG_DID);
String dfirstname = c.getString(TAG_DFIRSTNAME);
String dmiddlename = c.getString(TAG_DMIDDLENAME);
String dlastname = c.getString(TAG_DLASTNAME);
String demail = c.getString(TAG_DEMAIL);
String dcomments = c.getString(TAG_DCOMMENTS);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_DID, did);
map.put(TAG_DFIRSTNAME, dfirstname);
map.put(TAG_DMIDDLENAME, dmiddlename);
map.put(TAG_DLASTNAME, dlastname);
map.put(TAG_DEMAIL, demail);
map.put(TAG_DCOMMENTS, dcomments);
// adding HashList to ArrayList
mLeadsList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into the listview.
*/
private void updateList() {
// For a ListActivity we need to set the List Adapter, and in order to
// do
// that, we need to create a ListAdapter. This SimpleAdapter,
// will utilize our updated Hashmapped ArrayList,
// use our single_post xml template for each item in our list,
// and place the appropriate info from the list to the
// correct GUI id. Order is important here.
ListAdapter adapter = new SimpleAdapter(this, mNamesList,
R.layout.singlelead, new String[] { TAG_DFIRSTNAME,
TAG_DMIDDLENAME, TAG_DLASTNAME, TAG_DID,
TAG_DEMAIL, TAG_DCOMMENTS},
new int[] { R.id.dlfirstname, R.id.dlmiddlename,
R.id.dllastname, R.id.dlid, R.id.dlemail,
R.id.dlcomments});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// getting values from selected ListItem
String longid = ((TextView) v.findViewById(R.id.id)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), EditUsers.class);
// sending pid to next activity
in.putExtra("Listitem", longid);
// starting new activity and expecting some response back
startActivity(in);
}
});
}
public class LoadLeads extends AsyncTask<Void, Void, Boolean> {
@Override
protected void onPreExecute() {
super.onPreExecute();
tDialog = new ProgressDialog(LeadDisplay.this);
tDialog.setMessage("Loading Leads...");
tDialog.setIndeterminate(false);
tDialog.setCancelable(true);
tDialog.show();
}
@Override
protected Boolean doInBackground(Void... arg0) {
updateJSONdata();
return null;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
tDialog.dismiss();
updateList();
}
}
}
所以我需要 id、名字、中间名、姓氏、电子邮件和评论才能显示在我的列表视图中。我的错误是没有可用的帖子。
07-31 09:58:43.943: E/JSON Parser(13176): Error parsing data org.json.JSONException: End of input at character 0 of
07-31 09:58:43.943: W/System.err(13176): org.json.JSONException: No value for posts
07-31 09:58:43.943: W/System.err(13176): at org.json.JSONObject.get(JSONObject.java:354)
07-31 09:58:43.943: W/System.err(13176): at org.json.JSONObject.getJSONArray(JSONObject.java:544)
07-31 09:58:43.943: W/System.err(13176): at com.example.mysqltest.LeadDisplay.updateJSONdata(LeadDisplay.java:151)
07-31 09:58:43.943: W/System.err(13176): at com.example.mysqltest.LeadDisplay$LoadLeads.doInBackground(LeadDisplay.java:252)
07-31 09:58:43.943: W/System.err(13176): at com.example.mysqltest.LeadDisplay$LoadLeads.doInBackground(LeadDisplay.java:1)
07-31 09:58:43.943: W/System.err(13176): at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-31 09:58:43.943: W/System.err(13176): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-31 09:58:43.943: W/System.err(13176): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
07-31 09:58:43.943: W/System.err(13176): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-31 09:58:43.943: W/System.err(13176): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-31 09:58:43.943: W/System.err(13176): at java.lang.Thread.run(Thread.java:856)
07-31 09:58:43.963: I/endeffect(13176): AbsListView.onMeasure(), getWidth()=1080,