【发布时间】：2014-02-24 05:46:52
【问题描述】：
我正在尝试从 Android 应用程序调用 Asmx（.net Web 服务）。但是当我提供数据时，它给出了错误：
AndroidRuntime(591): FATAL EXCEPTION: Thread-75
AndroidRuntime(591): java.lang.NullPointerException: println needs a message
在 logcat 中显示数据正在运行：
D\Req value1(540): NetPositionReport{arg0=64396; b=Om$@!#@M^#R; }
可能是什么问题？
MainActivity.java
package com.example.clientnetpositionreport;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
EditText e1;
Button b1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1=(Button) findViewById(R.id.btn);
b1.setOnClickListener(new OnClickListener(){
public void onClick(View v){
e1=(EditText)findViewById(R.id.evofclientcode);
Intent i=new Intent(MainActivity.this,GetReport.class);
i.putExtra("ClientCode",e1.getText().toString());
startActivity(i);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
GetReport.java
package com.example.clientnetpositionreport;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.TextView;
public class GetReport extends Activity{
private static final String NAMESPACE ="http://xxxxxxx
private static final String URL = "http://xxxxxxxxxxxx/services/xxxx.asmx";
private static final String METHOD_NAME = "xxxxxxx";
private static final String SOAP_ACTION = "http://xxxx/xxxxxxxxx";
private String webResponse = "";
private Handler handler = new Handler();
private Thread thread;
private TextView textView1;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(1);
setContentView(R.layout.activity_tv);
textView1 = (TextView) findViewById(R.id.textview1);
//int val=getIntent().getExtras().getInt("Title");
String title= getIntent().getExtras().getString("ClientCode");
//Log.d("Data is", val);
System.out.println("Data is "+title);
startWebAccess(title);
}
public void startWebAccess(String a){
final String aa=a;
thread = new Thread(){
public void run(){
try{
Log.d("Req value0R", "Starting...");//log.d is used for debug
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
//simple object access protocol
PropertyInfo fromProp =new PropertyInfo();
fromProp.setName("arg0");
fromProp.setValue(aa);
fromProp.setType(String.class);
request.addProperty(fromProp);
PropertyInfo fromProp2 =new PropertyInfo();
fromProp2.setName("b");
fromProp2.setValue("Om$@!#@M^#R");
fromProp2.setType(String.class);
request.addProperty(fromProp2);
Log.d("Req value1", request.toString());
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = false;
envelope.setOutputSoapObject(request);
Log.d("Req value2", envelope.toString());
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
System.out.println("problem1");
androidHttpTransport.debug = true;
System.out.println("problem2");
Log.d("Req value2B", androidHttpTransport.toString());
System.out.println("problem3");
androidHttpTransport.call(SOAP_ACTION, envelope);
System.out.println("problem4");
Log.d("Req value2C", androidHttpTransport.toString());
System.out.println("problem5");
Object objectResult = (Object)envelope.getResponse();
System.out.println("problem6");
webResponse = objectResult.toString();
System.out.println("problem7");
}
catch(Exception e){
System.out.println("problem8");
Log.d("Req value4", e.getMessage() );
webResponse = "Connection/Internet problem";
webResponse = "Connection/Internet problem";
// Toast.makeText(getApplicationContext(), "Loading problem/Server down", Toast.LENGTH_SHORT).show();
}
handler.post(createUI);
}
};
thread.start();
}
final Runnable createUI = new Runnable() {
public void run(){
if(webResponse!=null) {
textView1.setText(webResponse);
}
else {
webResponse ="No data provided presently";
textView1.setText(webResponse);
}
}
};
}
注意：控制台输出直到 problem6。这意味着价值是 Null（我的想法。）所以请记住这一点。
Activity_Main.xml
<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=".MainActivity" >
<TextView
android:id="@+id/tvofclientcode"
android:layout_width="100dp"
android:layout_height="30dp"
android:text="Client Code"
/>
<EditText
android:id="@+id/evofclientcode"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_toRightOf="@+id/tvofclientcode"
android:inputType="text"/>
<Button
android:id="@+id/btn"
android:layout_width="100dp"
android:layout_height="40dp"
android:layout_below="@+id/tvofclientcode"
android:text="Submit"/>
</RelativeLayout>
可能是什么问题？
注意： log.d 方法正在获取字符串值，所以这不是某些相关情况下的问题。
【问题讨论】：
标签： java android web-services soap asmx