android - 向 Bluemix 部署的 Node.js 应用程序发送 httppost 请求时出现 "Unfortunately app has stopped"错误

Question

我正在创建一个 Android 应用程序，但是在使用 httppost 方法将参数发送到 Bluemix 部署的 Node.js 服务器时，我收到“不幸的是应用程序已停止”错误。谁能帮我解决这个问题？

我有疑问，无法收到来自 Node.js 的响应，票证链接:Am not able to send my request parameters to bluemix deployed node.js

Jave 代码如下:

      package com.example.rest;

       import java.io.IOException;
       import java.io.UnsupportedEncodingException;
       import java.util.ArrayList;
       import java.util.List;
      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 android.support.v7.app.ActionBarActivity;
     import android.app.Dialog;
     import android.content.SharedPreferences;
     import android.os.Bundle;
     import android.util.Log;
      import android.view.Menu;
      import android.view.MenuItem;
      import android.view.View;
     import android.widget.Adapter;
     import android.widget.Button;
      import android.widget.EditText;
     import android.widget.TextView;
    import android.widget.Toast;

 public class MainActivity extends ActionBarActivity {


String url = "http://mobilefeedbackform.mybluemix.net/";
List<NameValuePair> params;
SharedPreferences pref;
Dialog reset;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button breg1 = (Button) findViewById(R.id.buttonreg);

    breg1.setOnClickListener(new View.OnClickListener() {



        public void onClick(View v) {

            final EditText Name =(EditText) findViewById(R.id.editTextreg5);
            final EditText Email =(EditText) findViewById(R.id.editTextreg);
            final EditText Passwd =(EditText) findViewById(R.id.editTextreg2);

            if(Name.getText().toString().length()==0)
            {
                Toast.makeText(MainActivity.this,
                        "Please enter Name", Toast.LENGTH_LONG)
                        .show();
                return;
            }

            else if(Email.getText().toString().length()==0)
            {
                Toast.makeText(MainActivity.this,
                        "Please enter EmailId", Toast.LENGTH_LONG)
                        .show();
                return;
            }

            else if(Passwd.getText().toString().length()==0)
            {
                Toast.makeText(MainActivity.this,
                        "Please enter Password", Toast.LENGTH_LONG)
                        .show();
                return;
            }
            else
            {
                String nametxt = Name.getText().toString();
                String emailtxt = Email.getText().toString();
                String passwdtxt = Passwd.getText().toString();

             // Creating HTTP client
                HttpClient httpClient = new DefaultHttpClient();
                // Creating HTTP Post
                HttpPost httpPost = new HttpPost("http://mobilefeedbackform.mybluemix.net");

                // Building post parameters
                // key and value pair
                List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(3);
                nameValuePair.add(new BasicNameValuePair("name", nametxt));
                nameValuePair.add(new BasicNameValuePair("email", nametxt));
                nameValuePair.add(new BasicNameValuePair("password", passwdtxt));

                // Url Encoding the POST parameters
                try {
                    httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
                } catch (UnsupportedEncodingException e) {
                    // writing error to Log
                    e.printStackTrace();
                }

                // Making HTTP Request
                try {
                    HttpResponse response = httpClient.execute(httpPost);

                    // writing response to log
                    Log.d("Http Response:", response.toString());
                } catch (ClientProtocolException e) {
                    // writing exception to log
                    e.printStackTrace();
                } catch (IOException e) {
                    // writing exception to log
                    e.printStackTrace();

                }




            }
            }



        });

}

我的错误日志如下:

  04-24 18:26:13.799: E/AndroidRuntime(528): FATAL EXCEPTION: main
04-24 18:26:13.799:     E/AndroidRuntime(528):android.os.NetworkOnMainThreadException
04-24 18:26:13.799: E/AndroidRuntime(528):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
04-24 18:26:13.799: E/AndroidRuntime(528):  at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
04-24 18:26:13.799: E/AndroidRuntime(528):  at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
04-24 18:26:13.799: E/AndroidRuntime(528):  at java.net.InetAddress.getAllByName(InetAddress.java:220)
 04-24 18:26:13.799: E/AndroidRuntime(528):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
 04-24 18:26:13.799: E/AndroidRuntime(528):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
 04-24 18:26:13.799: E/AndroidRuntime(528):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at com.example.rest.MainActivity$1.onClick(MainActivity.java:106)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at android.view.View.performClick(View.java:3511)
   04-24 18:26:13.799: E/AndroidRuntime(528):   at android.view.View$PerformClick.run(View.java:14105)
   04-24 18:26:13.799: E/AndroidRuntime(528):   at android.os.Handler.handleCallback(Handler.java:605)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at android.os.Handler.dispatchMessage(Handler.java:92)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at android.os.Looper.loop(Looper.java:137)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at android.app.ActivityThread.main(ActivityThread.java:4424)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at java.lang.reflect.Method.invokeNative(Native Method)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at java.lang.reflect.Method.invoke(Method.java:511)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  04-24 18:26:13.799: E/AndroidRuntime(528):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
   04-24 18:26:13.799: E/AndroidRuntime(528):   at dalvik.system.NativeStart.main(Native Method)

Answer 1

该错误是因为您正在尝试在 Android 的主线程和 strictmode 上进行网络调用正在激活策略以阻止它。您可以在 android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork 这一行的堆栈跟踪中看到这一点。

您应该考虑在单独的线程上执行网络调用。严格模式旨在帮助为最终用户提供更好的体验。