Android：致命異常：主要。我做錯了什麼？

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我很開心的android開發人員。我想從服務器獲取一些數據，方法 - Post.As我明白我需要做請求，比我需要將HttpEntity轉換爲字符串，然後將字符串轉換爲json。活動文件的代碼：Android：致命異常：主要。我做錯了什麼？

package com.example.earchive; 

import java.io.IOException; 
import java.util.ArrayList; 
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.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 org.apache.http.util.EntityUtils; 
import org.json.JSONObject; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 

public class LoginActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_login); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.login, menu); 
/*** Work with login button ***/   
     final Button button = (Button) findViewById(R.id.login_bt); 
     button.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       HttpClient httpclient = new DefaultHttpClient(); 
       HttpPost httppost = new HttpPost("https://go.earchive.ca/json/user.php"); 

       try 
       { 
        EditText email  = (EditText)findViewById(R.id.email); 
        EditText password = (EditText)findViewById(R.id.password); 

        // Add your data 
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); 
        nameValuePairs.add(new BasicNameValuePair("em", email.getText().toString())); 
        nameValuePairs.add(new BasicNameValuePair("pa", password.getText().toString())); 
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 

        // Execute HTTP Post Request 

        HttpResponse response = httpclient.execute(httppost); 
        HttpEntity entity = response.getEntity(); 
        String result = EntityUtils.toString(entity); 

        try { 

         JSONObject obj = new JSONObject(result); 

         Log.d("My App", obj.toString()); 

        } catch (Throwable t) { 
         Log.e("My App", "Could not parse malformed JSON: \"" + result + "\""); 
        }     



       } catch (ClientProtocolException e) { 
        // TODO Auto-generated catch block 
       } catch (IOException e) { 
        // TODO Auto-generated catch block 
       } 
       //System.out.println(Arrays.toString(response)); 



      } 
     }); 
/*** End of work with login button ***/   


     return true; 


    } 
}

XML文件的代碼：

<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:background="@drawable/bkg_2" 
    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=".LoginActivity" > 

    <EditText 
     android:id="@+id/email" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/password" 
     android:layout_alignParentTop="true" 
     android:layout_alignRight="@+id/password" 
     android:layout_marginTop="162dp" 
     android:background="@color/white" 
     android:ems="10" 
     android:inputType="textEmailAddress" 
     android:padding="5px" /> 

    <ImageView 
     android:id="@+id/imageView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="41dp" 
     android:src="@drawable/lettera" /> 

    <ImageView 
     android:id="@+id/imageView2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/imageView1" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="16dp" 
     android:src="@drawable/scritta" /> 

    <EditText 
     android:id="@+id/password" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_centerVertical="true" 
     android:background="@color/white" 
     android:ems="10" 
     android:inputType="textPassword" 
     android:padding="5px" /> 

    <Button 
     android:id="@+id/login_bt" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/password" 
     android:layout_alignRight="@+id/password" 
     android:layout_below="@+id/password" 
     android:layout_marginTop="16dp" 
     android:text="Login" 
     android:background="@color/red" 
     android:textColor="@color/white" 

     /> 

    <CheckBox 
     android:id="@+id/checkBox1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/imageView2" 
     android:layout_below="@+id/button1" 
     android:layout_marginTop="16dp" 
     android:text="Remember me" 
     android:checked="true" 
     /> 

</RelativeLayout>

輸出：

02-11 10:19:10.378: D/dalvikvm(1302): GC_FOR_ALLOC freed 56K, 4% free 3327K/3452K, paused 31ms, total 33ms 
02-11 10:19:10.788: D/gralloc_goldfish(1302): Emulator without GPU emulation detected. 
02-11 10:19:23.398: D/InputEventConsistencyVerifier(1302): KeyEvent: ACTION_UP but key was not down. 
02-11 10:19:23.398: D/InputEventConsistencyVerifier(1302): in android.widget.EditText{b1e49448 VFED..CL .F....I. 179,489-589,548 #7f090001 app:id/password} 
02-11 10:19:23.398: D/InputEventConsistencyVerifier(1302): 0: sent at 1624812000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=1624812, downTime=1624667, deviceId=0, source=0x101 } 
02-11 10:19:24.318: D/dalvikvm(1302): GC_FOR_ALLOC freed 153K, 6% free 3688K/3908K, paused 34ms, total 39ms 
02-11 10:19:26.638: D/AndroidRuntime(1302): Shutting down VM 
02-11 10:19:26.638: W/dalvikvm(1302): threadid=1: thread exiting with uncaught exception (group=0xb1afbba8) 
02-11 10:19:26.658: E/AndroidRuntime(1302): FATAL EXCEPTION: main 
02-11 10:19:26.658: E/AndroidRuntime(1302): Process: com.example.earchive, PID: 1302 
02-11 10:19:26.658: E/AndroidRuntime(1302): android.os.NetworkOnMainThreadException 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at java.net.InetAddress.getAllByName(InetAddress.java:214) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at com.example.earchive.LoginActivity$1.onClick(LoginActivity.java:65) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.view.View.performClick(View.java:4438) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.view.View$PerformClick.run(View.java:18422) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.os.Handler.handleCallback(Handler.java:733) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.os.Handler.dispatchMessage(Handler.java:95) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.os.Looper.loop(Looper.java:136) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at java.lang.reflect.Method.invoke(Method.java:515) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
02-11 10:19:26.658: E/AndroidRuntime(1302):  at dalvik.system.NativeStart.main(Native Method)

是正確的路？感謝所有

來源

2014-02-11 Boris Kuzevanov

你正在沉重/慢工作的主線程，這可能是最糟糕的事情要做，如果你想獲取或發送數據/網絡，或者你需要做一些緩慢的工作嘗試移動到另一個線程。 – Ayoub

沒有。我有其他問題 –

我需要在其他課上做這個代碼？ –