執行doInBackround方法時發生錯誤

Question

我正在使用要使用KSOAP的Web服務發送要存儲在數據庫中的詳細信息。Web服務正常工作沒有問題。 當我不使用AsyncTask類時，此代碼有效。 我是android新手，這是我第一次嘗試使用AsyncTask類，但它不起作用。 我附上了日志貓錯誤，doinbackround方法出了點問題。 我究竟做錯了什么？ 請幫忙

public class Registration extends Activity{
private static final String SOAP_ACTION = "http://tempuri.org/register";
private static final String OPERATION_NAME = "register";
private static final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
private static final String SOAP_ADDRESS = "http://10.0.2.2:54714/WebSite1/Service.asmx";
Button sqlRegister, sqlView;

EditText  sqlFirstName,sqlLastName,sqlEmail,sqlMobileNumber,sqlCurrentLocation,sqlUsername,sqlPassword;

@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.registration);
sqlFirstName = (EditText) findViewById(R.id.etFname);
sqlLastName = (EditText) findViewById(R.id.etLname);
sqlEmail = (EditText) findViewById(R.id.etEmail);
sqlMobileNumber = (EditText) findViewById(R.id.etPhone);
sqlCurrentLocation = (EditText) findViewById(R.id.etCurrentLoc);

sqlUsername = (EditText) findViewById(R.id.etUsername);
sqlPassword = (EditText) findViewById(R.id.etPwd);

sqlRegister = (Button) findViewById(R.id.bRegister);
sqlRegister.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {
        switch (v.getId()){
        case R.id.bRegister:
        new LongOperation().execute("");
        break;
      }
     }
    });
}

private class LongOperation extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
         String firstname = sqlFirstName.getText().toString();
         String lastname = sqlLastName.getText().toString();
         String emailadd = sqlEmail.getText().toString();
         String number = sqlMobileNumber.getText().toString();
         String loc = sqlCurrentLocation.getText().toString();
         String uname = sqlUsername.getText().toString();
         String pwd = sqlPassword.getText().toString();

         SoapObject Request = new SoapObject(WSDL_TARGET_NAMESPACE,OPERATION_NAME);
         Request.addProperty("fname", String.valueOf(firstname));
         Request.addProperty("lname", String.valueOf(lastname));
         Request.addProperty("email", String.valueOf(emailadd));
         Request.addProperty("num", String.valueOf(number));
         Request.addProperty("loc", String.valueOf(loc));
         Request.addProperty("username", String.valueOf(uname));
         Request.addProperty("password", String.valueOf(pwd));
         Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show();

         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         envelope.dotNet = true;
         envelope.setOutputSoapObject(Request);
         HttpTransportSE httpTransport  = new HttpTransportSE(SOAP_ADDRESS);
         try
         {
            httpTransport.call(SOAP_ACTION, envelope);
             SoapObject response = (SoapObject)envelope.getResponse();
             int result =  Integer.parseInt(response.getProperty(0).toString());
             if(result == '1')
             {
                 return "Registered";
             }
             else
             {
                 return "Not Registered";
             }
         }catch(Exception e){
            e.printStackTrace();
        }
         return null;

    }      

    @Override
    protected void onPostExecute(String result) {
        if(result=="Registered")
        {
        Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show();
        }
        else if(result =="Not Registered")
        {
        Toast.makeText(Registration.this, "Try Again", Toast.LENGTH_LONG).show();
        }
        else
        {
            Toast.makeText(Registration.this, "Somethings wrong", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onPreExecute() {
    }

    @Override
    protected void onProgressUpdate(Void... values) {
    }
    }   
 }

////編輯

public class Registration extends Activity{
private static final String SOAP_ACTION = "http://tempuri.org/register";
private static final String OPERATION_NAME = "register";
private static final String WSDL_TARGET_NAMESPACE = "http://tempuri.org/";
private static final String SOAP_ADDRESS = "http://10.0.2.2:54714/WebSite1/Service.asmx";
Button sqlRegister, sqlView;

EditText  sqlFirstName,sqlLastName,sqlEmail,sqlMobileNumber,sqlCurrentLocation,sqlUsername,sqlPassword;

@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.registration);
sqlFirstName = (EditText) findViewById(R.id.etFname);
sqlLastName = (EditText) findViewById(R.id.etLname);
sqlEmail = (EditText) findViewById(R.id.etEmail);
sqlMobileNumber = (EditText) findViewById(R.id.etPhone);
sqlCurrentLocation = (EditText) findViewById(R.id.etCurrentLoc);

sqlUsername = (EditText) findViewById(R.id.etUsername);
sqlPassword = (EditText) findViewById(R.id.etPwd);

sqlRegister = (Button) findViewById(R.id.bRegister);
sqlRegister.setOnClickListener(new View.OnClickListener() {

    public void onClick(View v) {
        switch (v.getId()){
        case R.id.bRegister:
        new LongOperation().execute("");
        break;
      }
     }
    });
}

private class LongOperation extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {
         String firstname = sqlFirstName.getText().toString();
         String lastname = sqlLastName.getText().toString();
         String emailadd = sqlEmail.getText().toString();
         String number = sqlMobileNumber.getText().toString();
         String loc = sqlCurrentLocation.getText().toString();
         String uname = sqlUsername.getText().toString();
         String pwd = sqlPassword.getText().toString();

         SoapObject Request = new SoapObject(WSDL_TARGET_NAMESPACE,OPERATION_NAME);
         Request.addProperty("fname", String.valueOf(firstname));
         Request.addProperty("lname", String.valueOf(lastname));
         Request.addProperty("email", String.valueOf(emailadd));
         Request.addProperty("num", String.valueOf(number));
         Request.addProperty("loc", String.valueOf(loc));
         Request.addProperty("username", String.valueOf(uname));
         Request.addProperty("password", String.valueOf(pwd));

         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
         envelope.dotNet = true;
         envelope.setOutputSoapObject(Request);
         HttpTransportSE httpTransport  = new HttpTransportSE(SOAP_ADDRESS);
         Log.d("work","work");
         try
         {
            httpTransport.call(SOAP_ACTION, envelope);
             SoapObject response = (SoapObject)envelope.getResponse();
             int result =  Integer.parseInt(response.getProperty(0).toString());
             if(result == 1)
             {
                 Log.d("reg","reg");
                 return "Registered";
             }
             else
             {
                 Log.d("no","no");
                 return "Not Registered";
             }
         }catch(Exception e){
            e.printStackTrace();
        }
         return null;

    }      

    @Override
    protected void onPostExecute(String result) {
        Log.d("tag","onpost");
        if(result!=null)
        {

            if(result.equals("Registered"))
                {
                    Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show();
                }
            else if(result.equals("Not Registered"))
                {
                    Toast.makeText(Registration.this, "Try Again", Toast.LENGTH_LONG).show();
                }
        }
        else
        {
            Toast.makeText(Registration.this, "Somethings wrong", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected void onPreExecute() {
    }

    @Override
    protected void onProgressUpdate(Void... values) {
    }

    }   

}

Answer 1

嘗試這個....

1. 始終將UI工作在UI線程中，將非UI工作在Non-UI線程中。

2. doInBackground是一個非UI線程，因此您不能從此在UI線程上發布任何內容。

3. Toast語句是doInBackgroud中的問題，請將其移至postExecute，后者正在UI線程上工作。

    Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show(); 

Answer 2

你在打電話

Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show();

在doInBackground（）里面，它不在UI線程中運行。 那導致了問題。

嘗試這個：

runOnUiThread(new Runnable() {
    public void run() {
         Toast.makeText(Registration.this, "You have been registered Successfully", Toast.LENGTH_LONG).show();
    }
});
}

或將Toast.makeText移至onPostExecute（）方法，該方法在UI線程中運行

Answer 3

這是因為您在doInBackground（）中調用Toast。 doInBackground中的任何UI都會使looper（）異常。 因此，請嘗試在AsynTask的PostExecute（）中將UI設置為

@Override
protected void onPostExecute(String result) {

 Toast.makeText(Registration.this, "You have been registered Successfully",Toast.LENGTH_LONG).show();

}
 }

這可能對您有幫助。

Answer 4

您不應該使用==比較字符串。

protected void onPostExecute(String result) {
        if(result=="Registered")

這可能是意外行為背后的原因。 嘗試使用類似

result.equals("registered")

讀這個