Как починить android.os.NetworkOnMainThreadException

blits

Здравствуйте. Пытаюсь сделать POST запрос на ajax страницу с помощью HttpURLConnection. Сильно не пинайте, я только сегодня начал практиковать Java и Android. Тестю на API 22 (Intel x86). В обычном хроме та же страница нормально загружается. Logcat:

03-24 10:23:26.842 4679-4679/? I/art: Late-enabling -Xcheck:jni
03-24 10:23:27.402 4679-4679/com.gobonus.gobonus D/AndroidRuntime: Shutting down VM
03-24 10:23:27.427 4679-4679/com.gobonus.gobonus E/AndroidRuntime: FATAL EXCEPTION: main Process: com.gobonus.gobonus, PID: 4679 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gobonus.gobonus/com.gobonus.gobonus.WelcomeActivity}: android.os.NetworkOnMainThreadException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2358) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420) at android.app.ActivityThread.access$900(ActivityThread.java:154) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5294) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Caused by: android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147) at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110) at libcore.io.IoBridge.connectErrno(IoBridge.java:137) at libcore.io.IoBridge.connect(IoBridge.java:122) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456) at java.net.Socket.connect(Socket.java:882) at com.android.okhttp.internal.Platform.connectSocket(Platform.java:174) at com.android.okhttp.Connection.connect(Connection.java:152) at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276) at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211) at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382) at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106) at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:217) at com.gobonus.gobonus.Request.<init>(Request.java:65) at com.gobonus.gobonus.WelcomeActivity.onCreate(WelcomeActivity.java:15) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420) at android.app.ActivityThread.access$900(ActivityThread.java:154) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5294) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) at
</init>

com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)  03-24 10:23:27.498 4679-4690/com.gobonus.gobonus W/art: Suspending all threads took: 26.757ms Request.java:

package com.gobonus.gobonus;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
public class Request { private final String USER_AGENT = "GoBonus Android Client 1.0"; private final String API_SERVER = "http://192.168.2.21"; public String Content; public Request (String session_token, String uri, String params) { String urlParameters = "session_token="+session_token+"&"+params; // url params byte[] postData = new byte[0]; System.setProperty("http.agent", USER_AGENT); // user agent truck // api = android.os.Build.VERSION_CODES.KITKAT) { postData = urlParameters.getBytes( StandardCharsets.UTF_8 ); } else postData = urlParameters.getBytes(Charset.forName("UTF-8")); int postDataLength = postData.length; URL url = null; try { url = new URL( API_SERVER + uri); } catch (MalformedURLException e) { e.printStackTrace(); } HttpURLConnection conn= null; try { conn = (HttpURLConnection) url.openConnection(); } catch (IOException e) { e.printStackTrace(); } conn.setDoOutput( true ); conn.setInstanceFollowRedirects( false ); try { conn.setRequestMethod("POST"); } catch (ProtocolException e) { e.printStackTrace(); } conn.setRequestProperty( "Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty( "charset", "utf-8"); conn.setRequestProperty( "Content-Length", Integer.toString( postDataLength )); conn.setUseCaches( false ); try { DataOutputStream wr = new DataOutputStream( conn.getOutputStream()); wr.write( postData ); conn.connect(); Content = ConvertData(conn); } catch (IOException e) { e.printStackTrace(); } } protected String ConvertData (HttpURLConnection url) throws IOException { // local variables String line; StringBuffer text = new StringBuffer(); InputStreamReader in = new InputStreamReader((InputStream) url.getContent()); BufferedReader buff = new BufferedReader(in); do { line = buff.readLine(); text.append(line + "\n"); } while (line != null); return text.toString(); }
}

WelcomeActivity.java

package com.gobonus.gobonus;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class WelcomeActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView WebTest = (TextView) findViewById(R.id.webTest); WebTest.setText(new Request("123", "/ajax", "foo=bar").Content); setContentView(R.layout.activity_welcome); } public void LoginGo(View view) { Intent intent = new Intent(WelcomeActivity.this, LoginActivity.class); startActivity(intent); }
}

Манифест

<!--?xml version="1.0" encoding="utf-8"?-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.gobonus.gobonus"> <!-- To auto-complete the email text field in the login form with the user's emails --> <uses-permission android:name="android.permission.GET_ACCOUNTS"> <uses-permission android:name="android.permission.READ_PROFILE"> <uses-permission android:name="android.permission.READ_CONTACTS"> <uses-permission android:name="android.permission.INTERNET"> <application android:allowbackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsrtl="true" android:theme="@style/GB"> <activity android:name=".WelcomeActivity"> <intent-filter> <action android:name="android.intent.action.MAIN"> <category android:name="android.intent.category.LAUNCHER"> </category></action></intent-filter> </activity> <activity android:name=".LoginActivity" android:label="@string/title_activity_login" android:parentactivityname=".WelcomeActivity"> <meta-data android:name="android.support.PARENT_ACTIVITY" android:value="com.gobonus.gobonus.WelcomeActivity"> </meta-data></activity> </application>
</uses-permission></uses-permission></uses-permission></uses-permission></manifest>

Layout

<!--?xml version="1.0" encoding="utf-8"?--> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="com.gobonus.gobonus.WelcomeActivity"> <button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/sign" android:id="@+id/button" android:background="#B6B6B6" android:layout_marginbottom="162dp" android:onclick="LoginGo" android:layout_alignparentbottom="true" android:layout_alignright="@+id/button2" android:layout_alignend="@+id/button2" android:layout_alignparentleft="true" android:layout_alignparentstart="true"> </button><button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/reg" android:id="@+id/button2" android:background="#B6B6B6" android:layout_aligntop="@+id/button" android:layout_alignparentleft="true" android:layout_alignparentstart="true" android:layout_margintop="82dp" android:layout_alignparentright="true" android:layout_alignparentend="true"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="New Text" android:id="@+id/webTest" android:layout_alignparenttop="true" android:layout_centerhorizontal="true" android:layout_margintop="56dp">
</textview></button></relativelayout>
1 ответ

blits

Эксепшн NetworkOnMainThreadException говорит о том, что вы используете сетевые запросы в главном потоке, используйте AsyncTask для запуска запроса в отдельном от UI потока.

И Метод setContentView, нужно вызывать до того, как будете обращаться к элементам разметки.

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_welcome); TextView WebTest = (TextView) findViewById(R.id.webTest); WebTest.setText(new Request("123", "/ajax", "foo=bar").Content); }

UPD

Пример запроса через AsyncTask. Метод doInBackground выполняется в отдельном от UI потоке, после того, как вы выполнили запрос и получили ответ, ваши данные упадут в onPostExecute, который выполняется уже в потоке UI. Не обращайтесь к потоку UI в doInBackground, вызовет Exception.

public class WelcomeActivity extends AppCompatActivity { TextView WebTest; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_welcome); WebTest = (TextView) findViewById(R.id.webTest); new AsyncRequest().execute("123", "/ajax", "foo=bar"); } class AsyncRequest extends AsyncTask<string, integer,="" string="">{ @Override protected String doInBackground(String... arg) { return new Request(arg[0], arg[1], arg[2]).Content; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); WebTest.setText(s); } }
}
</string,>

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