我希望使用JSON从数据库中获取一些信息到我的Android应用程序，但是当我运行我的应用程序时，我在LOG中有一个错误，正好在这一行：JSONObject json = jsonParser.makeHttpRequest(url_pays_detials, "GET", params);
这是我的JAVA CODE：
ViewPays.java
package com.example.projet;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.view.WindowManager;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
public class ViewPays extends Activity {
TextView pays, langue, capitale, monnaie, richesse;
ImageView img;
static String imageLocation="";
String return_img="", id;
//Progress bar
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
// single pays url
private static final String url_pays_detials = "http://goldengym.ma/myTest/get_pays.php";
// JSON Node names
private static final String TAG_SUCCES = "succes";
private static final String TAG_PAYS = "pays";
private static final String TAG_ID = "id";
private static final String TAG_NOM = "nom";
private static final String TAG_PHOTO = "photo";
private static final String TAG_LANGUE = "langage";
private static final String TAG_CAPITALE = "capitale";
private static final String TAG_MONNAIE = "monnaie";
private static final String TAG_RICHESSE = "richesse";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.pays);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
img = (ImageView)findViewById(R.id.img_pays);
// getting pays details from intent
Intent i = getIntent();
// getting pays id (pid) from intent
id = i.getStringExtra(TAG_ID);
// Getting complete pays details in background thread
new GetPaysDetails().execute();
}
class GetPaysDetails extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ViewPays.this);
pDialog.setMessage("Chargement des détails...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... params) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int succes;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("id", id));
// getting pays details by making HTTP request
// Note that pays details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(url_pays_detials, "GET", params);
// check your log for json response
Log.d("Single pays Details", json.toString());
// json success tag
succes = json.getInt(TAG_SUCCES);
if (succes == 1) {
// successfully received pays details
JSONArray paysObj = json.getJSONArray(TAG_PAYS); // JSON Array
// get first pays object from JSON Array
JSONObject r_pays = paysObj.getJSONObject(0);
// pays with this pid found
// Edit Text
pays = (TextView)findViewById(R.id.txt_pays);
langue = (TextView)findViewById(R.id.txt_lang);
capitale = (TextView)findViewById(R.id.txt_capitale);
monnaie = (TextView)findViewById(R.id.txt_monnaie);
richesse = (TextView)findViewById(R.id.txt_richesse);
// display pays data in EditText
pays.setText(r_pays.getString(TAG_NOM));
langue.setText(r_pays.getString(TAG_LANGUE));
capitale.setText(r_pays.getString(TAG_CAPITALE));
monnaie.setText(r_pays.getString(TAG_MONNAIE));
richesse.setText(r_pays.getString(TAG_RICHESSE));
return_img = r_pays.getString(TAG_PHOTO);
loadImage(return_img);
}else{
// pays with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
Bitmap bitmap;
void loadImage(String image_location){
URL imageURL = null;
try {
imageURL = new URL(image_location);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection connection= (HttpURLConnection)imageURL.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream inputStream = connection.getInputStream();
bitmap = BitmapFactory.decodeStream(inputStream);//Convert to bitmap
img.setImageBitmap(bitmap);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
JSONParser.java
package com.example.projet;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
LOG
03-05 22:45:00.978: D/Launcher.LauncherModel(20943): --> package:com.example.projet
03-05 22:45:01.243: D/Launcher.LauncherModel(20943): --> update package com.example.projet
03-05 22:45:01.243: D/Launcher.LauncherModel(20943): --> package:com.example.projet
03-05 22:45:01.363: V/BackupManagerService(20666): updatePackageParticipantsLocked: com.example.projet
03-05 22:45:01.518: D/PackageBroadcastService(21010): Received broadcast action=android.intent.action.PACKAGE_REMOVED and uri=com.example.projet
03-05 22:45:01.983: V/BackupManagerService(20666): updatePackageParticipantsLocked: com.example.projet
03-05 22:45:03.133: W/DeepLinking(29845): no deep link install data found for com.example.projet
03-05 22:45:03.328: D/PackageBroadcastService(21010): Received broadcast action=android.intent.action.PACKAGE_ADDED and uri=com.example.projet
03-05 22:45:03.338: D/PackageAddedReceiver(20848): package added com.example.projet
03-05 22:45:03.748: D/PackageBroadcastService(21010): Received broadcast action=android.intent.action.PACKAGE_REPLACED and uri=com.example.projet
03-05 22:45:08.013: E/AndroidRuntime(30717): at com.example.projet.JSONParser.makeHttpRequest(JSONParser.java:62)
03-05 22:45:08.013: E/AndroidRuntime(30717): at com.example.projet.ViewPays$GetPaysDetails$1.run(ViewPays.java:99)
你能帮我解决这个错误吗:)
提前谢谢