本文介绍了错误HTTP connectionandroid.os.NetworkOnMainThreadException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当我开始了我的应用我有仿真器4.1和4.2，即使我已经在网上发权限的问题，logcat中显示了这种mssage：
在HTTP connectionandroid.os.NetworkOnMainThreadException？
包com.example.eagletracking;进口的java.io.InputStream;进口java.text.SimpleDateFormat的;
进口的java.util.ArrayList;
进口的java.util.Calendar;进口org.apache.http.HttpEntity;
进口org.apache.http.Htt presponse;
进口org.apache.http.NameValuePair;
进口org.apache.http.client.HttpClient;
进口org.apache.http.client.entity.UrlEn codedFormEntity;
进口org.apache.http.client.methods.HttpPost;
进口org.apache.http.impl.client.DefaultHttpClient;
进口org.apache.http.message.BasicNameValuePair;进口android.app.Activity;
进口android.app.AlertDialog;
进口android.content.Context;
进口android.content.DialogInterface;
进口android.content.Intent;
进口android.database.Cursor;
进口android.database.sqlite.SQLiteDatabase;
进口android.location.Location;
进口android.location.LocationListener;
进口android.location.LocationManager;
进口android.media.audiofx.BassBoost.Settings;
进口android.net.ConnectivityManager;
进口android.net.NetworkInfo;
进口android.os.Bundle;
进口android.os.Handler;
进口android.util.Log;
进口android.widget.Toast;公共类GPSTrackingActivity扩展活动实现LocationListener的{
吐司面包;
布尔isGPSAvaible;
私人的LocationManager流明;
私人位置定位;
私有静态字符串键= DBconection.key;
日历的currentdate;
SimpleDateFormat的格式;
公共静态双重纬度; //纬度
公共静态双经度; //经度 处理程序处理程序=新的处理程序（）{
公共无效的handleMessage（android.os.Message MSG）{
如果（msg.what == 0）{ 同步（）; } 否则如果（msg.what == 1）{
updateDatabase（位置）;
} } }; @覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.accueil）; 如果（isInternetAvailable（本））{ 主题日=新的Thread（）{ 公共无效的run（）{
尝试{
而（真）{
视频下载（80000）;
{
handler.sendEmptyMessage（0）;
} }
}赶上（例外五）{
e.printStackTrace（）;
}
}
};
th.start（）; } }
公共静态布尔isInternetAvailable（上下文的背景下）{
布尔isInternetAvailable = FALSE; 尝试{
ConnectivityManager connectivityManager =（ConnectivityManager）上下文
.getSystemService（Context.CONNECTIVITY_SERVICE）;
的NetworkInfo NETWORKINFO = connectivityManager
.getActiveNetworkInfo（）; 如果（NETWORKINFO =空＆放大器;！及（networkInfo.isConnected（）））{
isInternetAvailable = TRUE;
}
}赶上（例外的例外）{
// 没做什么
} 返回isInternetAvailable;
} @覆盖
保护无效onResume（）{
super.onResume（）;
尝试{
LM =（的LocationManager）getSystemService（LOCATION_SERVICE）;
isGPSAvaible = lm.isProviderEnabled（LocationManager.GPS_PROVIDER）;
如果（isGPSAvaible）
{
abonnementGPS（）; }
}赶上（例外五）{
e.printStackTrace（）;
} }
私人无效abonnementGPS（）{
lm.requestLocationUpdates（LocationManager.GPS_PROVIDER，10000，0，
这个）;
如果（LM！= NULL）{
位置= LM
.getLastKnownLocation（LocationManager.GPS_PROVIDER）;
主题日=新的Thread（）{ 公共无效的run（）{
尝试{
而（位置！= NULL）{
视频下载（6000）;
{
handler.sendEmptyMessage（1）;
} }
}赶上（例外五）{
e.printStackTrace（）;
}
}
};
th.start（）;
}
} 私人无效同步（）{
DBconection maBaseSQLite =新DBconection（GPSTrackingActivity.this）;
SQLiteDatabase分贝= maBaseSQLite.getReadableDatabase（）;
光标C = maBaseSQLite.getAllRows（）;
INT COL = c.getCount（）; //山坳= 0加莱enregistrement归仁
// verifie拉状态
如果（COL == 0）{
Toast.makeText（GPSTrackingActivity.this，加莱最近搜索
Toast.LENGTH_LONG）.show（）;
//修护乐contenue冠军登录等MOT德过时 }其他{
c.moveToFirst（）;
而（c.isAfterLast（）== FALSE）{
// INT转换为字符串铸造
串ID =+ c.getInt（0）;
串经度= c.getString（1）;
串纬度= c.getString（2）;
字符串时间= c.getString（3）;
串key_employe = c.getString（4）;
InputStream为= NULL;
ArrayList的＆LT;＆的NameValuePair GT; namevaluepairs中=新的ArrayList＆LT;＆的NameValuePair GT;（
4）;
// nameValuePairs.add（新BasicNameValuePair（ID，
// CH1））;
nameValuePairs.add（新BasicNameValuePair（经度
经度））;
namevaluepairs中
。新增（新BasicNameValuePair（纬度，纬度））;
nameValuePairs.add（新BasicNameValuePair（时间，时间））;
nameValuePairs.add（新BasicNameValuePair（key_employe，key_employe））;
c.moveToNext（）;
尝试{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httppost =新HttpPost（
http://10.0.2.2:8888/android/synchron.php）;
httppost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpclient.execute（httppost）;
HttpEntity实体= response.getEntity（）;
是= entity.getContent（）;
}赶上（例外五）{
Log.d（connexion_expired
错误http连接+ e.toString（））;
}
} } c.close（）;
maBaseSQLite.del（）;
maBaseSQLite.close（）;
} 私人无效updateDatabase（地点）{
DBconection maBaseSQLite =新DBconection（GPSTrackingActivity.this）;
SQLiteDatabase DB = maBaseSQLite.getWritableDatabase（）; // maBaseSQLite.onCreate（DB）;
//maBaseSQLite.onUpgrade(DB，0，0）;
经度= location.getLatitude（）;
纬度= location.getLatitude（）;
的currentdate = Calendar.getInstance（）;
格式化=新的SimpleDateFormat（YYYY / MMM / DD HH：MM：SS）;
maBaseSQLite.addPoint（将String.valueOf（经度）
将String.valueOf（纬度），
formatter.format（currentDate.getTime（）），（关键））;
Log.i（插入，OK）;
maBaseSQLite.close（）;
} @覆盖
公共无效onLocationChanged（位置为arg0）{
} @覆盖
公共无效onProviderDisabled（字符串为arg0）{
// TODO自动生成方法存根 } @覆盖
公共无效onProviderEnabled（字符串为arg0）{
// TODO自动生成方法存根 } @覆盖
公共无效onStatusChanged（字符串为arg0，ARG1 INT，捆绑ARG2）{
// TODO自动生成方法存根 }
}
解决方案
当你在主UI线程上运行的网络相关操作时NetworkOnMainThread例外。的
您使用应该使用的AsyncTask为此也可以创建自己的线程。
您正在主UI线程上的HTTP请求。
检查标题的4个步骤根据以上尤其是话题的链接。
例如：
类TheTask扩展的AsyncTask＆LT;太虚，太虚，太虚＆GT;
{
在preExecute保护无效（）
{super.on preExecute（）;
//显示progressdialog。
} 保护无效doInBackground（无效... PARAMS）
{
//网络相关opearaiton。这里不更新用户界面 返回null;
} 保护无效onPostExecute（虚空结果）
{
super.onPostExecute（结果）;
//解雇progressdialog。
//更新UI
}
}
when I launched my application I have a problem with emulator 4.1 and 4.2 even I have already made the Internet permission, logcat shows this mssage:Error in http connectionandroid.os.NetworkOnMainThreadException ?
package com.example.eagletracking;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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 android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.media.audiofx.BassBoost.Settings;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;
public class GPSTrackingActivity extends Activity implements LocationListener {
Toast toast;
boolean isGPSAvaible;
private LocationManager lm;
private Location location;
private static String key =DBconection.key;
Calendar currentDate;
SimpleDateFormat formatter;
public static double latitude; // latitude
public static double longitude; // longitude
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 0) {
synchronisation();
}
else if (msg.what == 1) {
updateDatabase(location);
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.accueil);
if (isInternetAvailable(this)) {
Thread th = new Thread() {
public void run() {
try {
while (true) {
Thread.sleep(80000);
{
handler.sendEmptyMessage(0);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
th.start();
}
}
public static boolean isInternetAvailable(Context context) {
boolean isInternetAvailable = false;
try {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager
.getActiveNetworkInfo();
if (networkInfo != null && (networkInfo.isConnected())) {
isInternetAvailable = true;
}
} catch (Exception exception) {
// Do Nothing
}
return isInternetAvailable;
}
@Override
protected void onResume() {
super.onResume();
try {
lm = (LocationManager) getSystemService(LOCATION_SERVICE);
isGPSAvaible = lm.isProviderEnabled (LocationManager.GPS_PROVIDER);
if (isGPSAvaible)
{
abonnementGPS();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void abonnementGPS() {
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 0,
this);
if (lm != null) {
location = lm
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Thread th = new Thread() {
public void run() {
try {
while (location != null) {
Thread.sleep(6000);
{
handler.sendEmptyMessage(1);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
th.start();
}
}
private void synchronisation() {
DBconection maBaseSQLite = new DBconection(GPSTrackingActivity.this);
SQLiteDatabase db = maBaseSQLite.getReadableDatabase();
Cursor c = maBaseSQLite.getAllRows();
int col = c.getCount(); // col=0 pas de enregistrement qui
// verifie la condition
if (col == 0) {
Toast.makeText(GPSTrackingActivity.this, "Pas de donnees ",
Toast.LENGTH_LONG).show();
// effacer le contenue champ login et mot de passe
} else {
c.moveToFirst();
while (c.isAfterLast() == false) {
// conversion int to string casting
String id = "" + c.getInt(0);
String longitude = c.getString(1);
String latitude = c.getString(2);
String time = c.getString(3);
String key_employe = c.getString(4);
InputStream is = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
4);
// nameValuePairs.add(new BasicNameValuePair("id",
// ch1));
nameValuePairs.add(new BasicNameValuePair("longitude",
longitude));
nameValuePairs
.add(new BasicNameValuePair("latitude", latitude));
nameValuePairs.add(new BasicNameValuePair("time", time));
nameValuePairs.add(new BasicNameValuePair("key_employe", key_employe));
c.moveToNext();
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://10.0.2.2:8888/android/synchron.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.d("connexion_expired",
"Error in http connection" + e.toString());
}
}
}
c.close();
maBaseSQLite.del();
maBaseSQLite.close();
}
private void updateDatabase(Location location) {
DBconection maBaseSQLite = new DBconection(GPSTrackingActivity.this);
SQLiteDatabase DB = maBaseSQLite.getWritableDatabase();
// maBaseSQLite.onCreate(DB);
//maBaseSQLite.onUpgrade(DB, 0, 0);
longitude= location.getLatitude();
latitude=location.getLatitude();
currentDate = Calendar.getInstance();
formatter = new SimpleDateFormat("yyyy/MMM/dd HH:mm:ss");
maBaseSQLite.addPoint(String.valueOf(longitude),
String.valueOf(latitude),
formatter.format(currentDate.getTime()),(key));
Log.i("insert ", "ok");
maBaseSQLite.close();
}
@Override
public void onLocationChanged(Location arg0) {
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
解决方案
NetworkOnMainThread exception occurs when you are running network related operation on the main UI thread. http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
You use should use a asynctask for this purpose or create your own thread.
You are making a http request on the main ui thread.
http://developer.android.com/reference/android/os/AsyncTask.html
Check the link above especially the topic under the heading The 4 steps.
Example:
class TheTask extends AsyncTask<Void,Void,Void>
{
protected void onPreExecute()
{ super.onPreExecute();
//display progressdialog.
}
protected void doInBackground(Void ...params)
{
//Network related opearaiton. Do not update ui here
return null;
}
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
//dismiss progressdialog.
//update ui
}
}
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