按鈕值的空指針異常

Question

我的網絡服務出現問題。我的佈局包含這些領域

username edittextbox 

password edittextbox 

gender button(male), button(female) 

mailid edittextbox 

每當我點擊按鈕的男性對性別的選擇應採取的字符串值作爲男性，女性應該採取女性。我無法寫出確切的代碼，因爲我是新來的android becoz，我得到了logcat中的空指針異常。

我想添加這些字符串值來請求我的web服務的obj將數據發送到服務器，如request.addProperty（「gender」，gender）;根據用戶選擇

有人請幫我寫的性別選擇確切的代碼，這樣我就不會在logcat中得到任何NPE

代碼

Button regmalebtn; 
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); 
public void register() { 
    Log.v(TAG, "Trying to Login"); 

    EditText etxt_user = (EditText) findViewById(R.id.regetfirstname); 
    EditText etxt_pass = (EditText) findViewById(R.id.regetlastname); 
    EditText etxt_dob = (EditText) findViewById(R.id.regetdob); 
    EditText etxt_email = (EditText) findViewById(R.id.regetemail); 
    EditText etxt_password = (EditText) findViewById(R.id.regetpwd); 
    EditText etxt_mobno = (EditText) findViewById(R.id.regetmobno); 
    EditText deviceid = null; 
    String fname = etxt_user.getText().toString(); 
    String lname = etxt_pass.getText().toString(); 
    String dob = etxt_dob.getText().toString(); 
    String email = etxt_email.getText().toString(); 
    String password = etxt_password.getText().toString(); 
    String mobno = etxt_mobno.getText().toString(); 
    String gender= regmalebtn.getText().toString(); 
    int latitude =**; 
    int longitude= **; 
    String device_id= "12345"; 
    // regmalebtn.sette 

// DefaultHttpClient client = new DefaultHttpClient(); 
    //HttpPost httppost = new HttpPost(
    //  "http://....."); 
    SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(
      SoapEnvelope.VER11); 

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
    soapEnvelope.dotNet = true; 
    soapEnvelope.setOutputSoapObject(request); 



    //String response1 = request.getProperty(0).toString() ; 
    request.addProperty("fname", fname); 
    request.addProperty("lname", lname); 
    request.addProperty("dateofbirth", dob); 
    request.addProperty("email", email); 
    request.addProperty("password", password); 
    request.addProperty("mobno", mobno); 
    request.addProperty("latitude", latitude); 
    request.addProperty("longitude", longitude); 
    request.addProperty("device_id", device_id); 
    request.addProperty("gender", gender); 
    //request.addProperty("latitude',latitude); 





    try { 
     androidHttpTransport.call(SOAP_ACTION, soapEnvelope); 

     SoapPrimitive resultsRequestSOAP = (SoapPrimitive) soapEnvelope 
       .getResponse(); 
     //SoapObject result = (SoapObject) soapEnvelope.getResponse(); 
     String resultData; 
     resultData = request.getProperty(0).toString(); 
    } catch (Exception e) { 

     e.printStackTrace(); 
    } 

} 

這些都是logcat的錯誤

06-16 11:55:58.955: ERROR/AndroidRuntime(471): FATAL EXCEPTION: Thread-8 
06-16 11:55:58.955: ERROR/AndroidRuntime(471): java.lang.NullPointerException 
06-16 11:55:58.955: ERROR/AndroidRuntime(471):  at com.soap.Register.register(Register.java:125) 
06-16 11:55:58.955: ERROR/AndroidRuntime(471):  at com.soap.Register$1$1.run(Register.java:66) 
06-16 11:55:58.965: WARN/ActivityManager(58): Force finishing activity com.soap/.Register 

Answer 1

您需要：

Button regmalebtn = (Button) findViewById(R.id.regetmalebtn); 

或類似的東西。

我不能看到你指定的其他地方你regmalebtn，所以這

String gender= regmalebtn.getText().toString(); 

會導致空指針，因爲你只有這

Button regmalebtn; 

ATM