HttpURLConnection類的getOutputStream有plroblem

Question

我做一個Android應用程序，並用於HttpURLConnection的，POST方法， HoloEverywhere圖書館 但我有問題... 爲什麼會發生到我不知道問題... IM認爲， getOutputStream（）錯誤，因爲如果使用getOutputStream（）方法顯示消息「應用程序不幸，*已停止。」並停止應用程序。

main.java

import java.io.BufferedOutputStream; 
import java.io.IOException; 
import java.io.OutputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 

import android.os.Bundle; 
import android.util.Log; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ImageView; 
import android.widget.TextView; 

import com.actionbarsherlock.app.SherlockActivity; 

public class Main extends SherlockActivity { 
    EditText ID, PS; 
    String myId, myPs, myResult; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     findViewById(R.id.login_button).setOnClickListener(mClickListener); 
    } 

    Button.OnClickListener mClickListener = new Button.OnClickListener() { 
     public void onClick(View v) { 
      ID = (EditText)findViewById(R.id.id_text); 
      PS = (EditText)findViewById(R.id.ps_text); 
      myId = ID.getText().toString(); 
      myPs = PS.getText().toString(); 
      HttpPostData(); 
     } 
    }; 

    public void HttpPostData() { 
     try { 
      URL communion_login = new URL("http://communion.gntc.net/Default.aspx"); 
      HttpURLConnection connection = (HttpURLConnection) communion_login.openConnection(); 
      connection.setRequestProperty("content-type", "application/x-www-form-urlencoded"); 
      connection.setRequestMethod("POST"); 

      connection.setDoInput(true); 
      connection.setDoOutput(true); 
      connection.setUseCaches(false); 
      connection.setDefaultUseCaches(false); 

      StringBuffer buffer = new StringBuffer(); 
      buffer.append("LoginView1$txtID").append("=").append(myId).append("&"); 
      buffer.append("LoginView1$txtPW").append("=").append(myPs); 

      OutputStream opstrm = new BufferedOutputStream(connection.getOutputStream()); 
      opstrm.write(buffer.toString().getBytes()); 
      opstrm.flush(); 
      opstrm.close(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

---

logcat的

05-01 02:15:20.618: D/AndroidRuntime(5632): Shutting down VM 
05-01 02:15:20.618: W/dalvikvm(5632): threadid=1: thread exiting with uncaught exception (group=0x416dc2a0) 
05-01 02:15:20.633: E/AndroidRuntime(5632): FATAL EXCEPTION: main 
05-01 02:15:20.633: E/AndroidRuntime(5632): android.os.NetworkOnMainThreadException 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpConnection.connect(HttpConnection.java:128) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpEngine.connect(HttpEngine.java:310) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:188) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at com.nathaniel.gntc_communion.Main.HttpPostData(Main.java:67) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at com.nathaniel.gntc_communion.Main$1.onClick(Main.java:40) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.view.View.performClick(View.java:4261) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.view.View$PerformClick.run(View.java:17356) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.os.Handler.handleCallback(Handler.java:615) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.os.Handler.dispatchMessage(Handler.java:92) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.os.Looper.loop(Looper.java:137) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at android.app.ActivityThread.main(ActivityThread.java:4921) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at java.lang.reflect.Method.invokeNative(Native Method) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at java.lang.reflect.Method.invoke(Method.java:511) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
05-01 02:15:20.633: E/AndroidRuntime(5632):  at dalvik.system.NativeStart.main(Native Method) 

我想想的getOutputStream（）< <有一個問題...

Answer 1

android.os.NetworkOnMainThreadException

您正在嘗試在UI線程，該線程的Android 3.0+設備將不允許進行網絡操作。他們將拋出此異常，表明您正在UI線程上執行網絡操作。 嘗試使用AsyncTask或單獨的Thread執行網絡操作