我有一个问题：我想在模拟器上通过php显示来自mysql数据库的数据，我发现异常
Connection to 127.0.0.1 refused
我将127.0.0.1更改为localhost或10.0.2.1或10.0.2.2它是相同的。
我使用 EasyPhp ，我已经多次重置我的电脑和服务器，但它是一样的。
当我在浏览器上执行链接时，它可以正常工作。
package com.example.androidhive;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
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.util.Log;
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;
public class AllProductsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://127.0.0.1/android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
// products JSONArray
JSONArray products = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditProductActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllProductsActivity.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
package com.example.androidhive;
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"), 10);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
Log.e("Buffer Error", "getting JSon String from server :-- " + sb.toString());
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;
}
}
03-26 00:21:10.348: W/System.err(334): org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.1:1080 refused
03-26 00:21:10.358: W/System.err(334): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:178)
03-26 00:21:10.358: W/System.err(334): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
03-26 00:21:10.358: W/System.err(334): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
03-26 00:21:10.358: W/System.err(334): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:348)
03-26 00:21:10.379: W/System.err(334): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
03-26 00:21:10.379: W/System.err(334): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
03-26 00:21:10.389: W/System.err(334): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
03-26 00:21:10.389: W/System.err(334): at com.example.androidhive.JSONParser.makeHttpRequest(JSONParser.java:62)
03-26 00:21:10.389: W/System.err(334): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:128)
03-26 00:21:10.389: W/System.err(334): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
03-26 00:21:10.389: W/System.err(334): at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-26 00:21:10.429: W/System.err(334): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-26 00:21:10.451: W/System.err(334): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-26 00:21:10.458: W/System.err(334): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
03-26 00:21:10.471: W/System.err(334): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
03-26 00:21:10.471: W/System.err(334): at java.lang.Thread.run(Thread.java:1096)
03-26 00:21:10.478: W/System.err(334): Caused by: java.net.ConnectException: /127.0.0.1:1080 - Connection refused
03-26 00:21:10.488: W/System.err(334): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:254)
03-26 00:21:10.488: W/System.err(334): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:533)
03-26 00:21:10.488: W/System.err(334): at java.net.Socket.connect(Socket.java:1055)
03-26 00:21:10.488: W/System.err(334): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
03-26 00:21:10.498: W/System.err(334): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
03-26 00:21:10.498: W/System.err(334): ... 15 more
03-26 00:21:10.528: E/Buffer Error(334): Error converting result java.lang.NullPointerException
03-26 00:21:10.548: E/JSON Parser(334): Error parsing data org.json.JSONException: End of input at character 0 of
03-26 00:21:10.578: W/dalvikvm(334): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
03-26 00:21:10.659: E/AndroidRuntime(334): FATAL EXCEPTION: AsyncTask #1
03-26 00:21:10.659: E/AndroidRuntime(334): java.lang.RuntimeException: An error occured while executing doInBackground()
03-26 00:21:10.659: E/AndroidRuntime(334): at android.os.AsyncTask$3.done(AsyncTask.java:200)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.lang.Thread.run(Thread.java:1096)
03-26 00:21:10.659: E/AndroidRuntime(334): Caused by: java.lang.NullPointerException
03-26 00:21:10.659: E/AndroidRuntime(334): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:131)
03-26 00:21:10.659: E/AndroidRuntime(334): at com.example.androidhive.AllProductsActivity$LoadAllProducts.doInBackground(AllProductsActivity.java:1)
03-26 00:21:10.659: E/AndroidRuntime(334): at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-26 00:21:10.659: E/AndroidRuntime(334): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-26 00:21:10.659: E/AndroidRuntime(334): ... 4 more
03-26 00:21:12.128: E/WindowManager(334): Activity com.example.androidhive.AllProductsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@43e50508 that was originally added here
03-26 00:21:12.128: E/WindowManager(334): android.view.WindowLeaked: Activity com.example.androidhive.AllProductsActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@43e50508 that was originally added here
03-26 00:21:12.128: E/WindowManager(334): at android.view.ViewRoot.<init>(ViewRoot.java:247)
03-26 00:21:12.128: E/WindowManager(334): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
03-26 00:21:12.128: E/WindowManager(334): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
03-26 00:21:12.128: E/WindowManager(334): at android.view.Window$LocalWindowManager.addView(Window.java:424)
03-26 00:21:12.128: E/WindowManager(334): at android.app.Dialog.show(Dialog.java:241)
03-26 00:21:12.128: E/WindowManager(334): at com.example.androidhive.AllProductsActivity$LoadAllProducts.onPreExecute(AllProductsActivity.java:118)
03-26 00:21:12.128: E/WindowManager(334): at android.os.AsyncTask.execute(AsyncTask.java:391)
03-26 00:21:12.128: E/WindowManager(334): at com.example.androidhive.AllProductsActivity.onCreate(AllProductsActivity.java:58)
03-26 00:21:12.128: E/WindowManager(334): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-26 00:21:12.128: E/WindowManager(334): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-26 00:21:12.128: E/WindowManager(334): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-26 00:21:12.128: E/WindowManager(334): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-26 00:21:12.128: E/WindowManager(334): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-26 00:21:12.128: E/WindowManager(334): at android.os.Handler.dispatchMessage(Handler.java:99)
03-26 00:21:12.128: E/WindowManager(334): at android.os.Looper.loop(Looper.java:123)
03-26 00:21:12.128: E/WindowManager(334): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-26 00:21:12.128: E/WindowManager(334): at java.lang.reflect.Method.invokeNative(Native Method)
03-26 00:21:12.128: E/WindowManager(334): at java.lang.reflect.Method.invoke(Method.java:521)
03-26 00:21:12.128: E/WindowManager(334): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-26 00:21:12.128: E/WindowManager(334): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-26 00:21:12.128: E/WindowManager(334): at dalvik.system.NativeStart.main(Native Method)
03-26 00:21:16.099: I/Process(334): Sending signal. PID: 334 SIG: 9
答案 0 :(得分：5)
如果您在设备中使用127.0.0.1，则它指向设备中的localhost。您必须使用服务器的IP。
祝你好运
答案 1 :(得分：0)
模拟器是另一台机器。
找到您的计算机的IP并使用它代替127.0.0.1