我正在尝试将Android系统与PHP和MySQL连接起来，以创建一个简单的登录活动。我正在使用运行4.2 Android版本的genymotion模拟器。
我在我的代码中使用该线程使其在后台运行，并使用JSON以平滑的方式获取数据。
但问题是系统崩溃并强行关闭。如果有人能帮助我，我会很感激。
02-02 21:29:46.260: E/AndroidRuntime(1363): FATAL EXCEPTION: main
02-02 21:29:46.260: E/AndroidRuntime(1363): android.os.NetworkOnMainThreadException
02-02 21:29:46.260: E/AndroidRuntime(1363): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
02-02 21:29:46.260: E/AndroidRuntime(1363): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
02-02 21:29:46.260: E/AndroidRuntime(1363): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-02 21:29:46.260: E/AndroidRuntime(1363): at libcore.io.IoBridge.connect(IoBridge.java:112)
02-02 21:29:46.260: E/AndroidRuntime(1363): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-02 21:29:46.260: E/AndroidRuntime(1363): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-02 21:29:46.260: E/AndroidRuntime(1363): at java.net.Socket.connect(Socket.java:842)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
02-02 21:29:46.260: E/AndroidRuntime(1363): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
02-02 21:29:46.260: E/AndroidRuntime(1363): at pack.coderzheaven.JSONParser.makeHttpRequest(JSONParser.java:65)
02-02 21:29:46.260: E/AndroidRuntime(1363): at pack.coderzheaven.AndroidPHPConnectionDemo$CheckLogin$1.run(AndroidPHPConnectionDemo.java:118)
02-02 21:29:46.260: E/AndroidRuntime(1363): at android.os.Handler.handleCallback(Handler.java:730)
02-02 21:29:46.260: E/AndroidRuntime(1363): at android.os.Handler.dispatchMessage(Handler.java:92)
02-02 21:29:46.260: E/AndroidRuntime(1363): at android.os.Looper.loop(Looper.java:137)
02-02 21:29:46.260: E/AndroidRuntime(1363): at android.app.ActivityThread.main(ActivityThread.java:5103)
02-02 21:29:46.260: E/AndroidRuntime(1363): at java.lang.reflect.Method.invokeNative(Native Method)
02-02 21:29:46.260: E/AndroidRuntime(1363): at java.lang.reflect.Method.invoke(Method.java:525)
02-02 21:29:46.260: E/AndroidRuntime(1363): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
02-02 21:29:46.260: E/AndroidRuntime(1363): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-02 21:29:46.260: E/AndroidRuntime(1363): at dalvik.system.NativeStart.main(Native Method)
package pack.coderzheaven;
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();
}
*/
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;
}
}
package pack.coderzheaven;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
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.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class AndroidPHPConnectionDemo extends Activity {
Button b;
EditText et, pass;
String Username, Password;
TextView tv;
HttpPost httppost;
StringBuffer buffer;
HttpResponse response;
HttpClient httpclient;
List<NameValuePair> nameValuePairs;
String pid;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
private static final String url_check_login = "http://10.0.3.2/check.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PERSON = "person";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "username";
private static final String TAG_pass = "password";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b = (Button) findViewById(R.id.Button01);
et = (EditText) findViewById(R.id.username);
pass = (EditText) findViewById(R.id.password);
tv = (TextView) findViewById(R.id.tv);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// login();
// Getting complete person details in background thread
new CheckLogin().execute();
}
});
}
/**
* Background Async Task to Get complete person details
* */
class CheckLogin extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AndroidPHPConnectionDemo.this);
pDialog.setMessage("Loading person details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting person details in background thread
* */
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting person details by making HTTP request
// Note that person details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_check_login, "GET", params);
// check your log for json response
Log.d("Single person Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received person details
JSONArray productObj = json
.getJSONArray(TAG_PERSON); // JSON Array
// get first product object from JSON Array
JSONObject person = productObj.getJSONObject(0);
et.setText(person.getString(TAG_NAME));
pass.setText(person.getString(TAG_pass));
Log.e("success in login", "SUCCESS IN LOGIN");
}
else {
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
pDialog.dismiss();
}
}
<?php
require_once('db_config.php');
// array for JSON response
$response = array();
//if(isset($_GET['Username'])and isset($_POST['Password'])){
if(isset($_GET['pid'])){
// $username = $_POST['Username'];
// $password = $_POST['Password'];
$pid = $_GET['pid'];
// $query_search = "select username, password from members where username = '".$username."' AND password = '".$password. "'";
$query_search = "select from members where pid = '".$pid."'";
$query_exec = mysql_query($query_search) or die(mysql_error());
if (mysql_num_rows($query_exec) > 0)
{
$result = mysql_fetch_array($query_exec);
$person = array();
$person['username']=$result[username];
$person['password']=$result['password'];
// success
$response["success"] = 1;
// user node
$response["person"] = array();
array_push($response["person"], $person);
// echoing JSON response
echo json_encode($response);
}
else
{
// no user found
$response["success"] = 0;
$response["message"] = "No User found";
// echo no users JSON
echo json_encode($response);
}
}
else
{
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
答案 0 :(得分：1)
问题是AsyncTask中的runOnUiThread。你得到了异常，因为你将UI线程捆绑了太长时间。使用AsyncTask是正确的做法，但是你从内部调用runOnUiThread，这没有意义，因为它不再是异步的。
这样的事情：
/**
* Background Async Task to Get complete person details
* */
class CheckLogin extends AsyncTask<String, String, String> {
JSONArray productObj;
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AndroidPHPConnectionDemo.this);
pDialog.setMessage("Loading person details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Getting person details in background thread
* */
@Override
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting person details by making HTTP request
// Note that person details url will use GET request
JSONObject json = jsonParser.makeHttpRequest(
url_check_login, "GET", params);
// check your log for json response
Log.d("Single person Details", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully received person details
productObj = json
.getJSONArray(TAG_PERSON); // JSON Array
}
else {
// product with pid not found
}
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once got all details
if ( productObj != null ) {
// get first product object from JSON Array
JSONObject person = productObj.getJSONObject(0);
et.setText(person.getString(TAG_NAME));
pass.setText(person.getString(TAG_pass));
Log.e("success in login", "SUCCESS IN LOGIN");
}
pDialog.dismiss();
}
}