-5

我对返回 String Value 的 Spinner 的最终变量有疑问。

请在下面的代码中显示注释，以使我的 Q 更清晰。完整的课程代码：

package com.hesham.sams;


import java.io.ByteArrayInputStream;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import android.os.Bundle;
import android.os.StrictMode;
import android.app.Activity;
import android.content.Intent;
//import android.content.Context;
import android.graphics.Typeface;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
//import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;


public class ContactusActivity extends Activity  {




@Override
protected void onCreate(Bundle savedInstanceState) {


    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_contactus);


    final TextView subjectTxt = (TextView) findViewById(R.id.subjectTxt);
    final TextView emailTxtusfrom = (TextView)   findViewById(R.id.emailfromTxtus);
     final TextView messageTxt = (TextView) findViewById(R.id.messageTxt);

    Button lButton = (Button)findViewById(R.id.sendbtn);


    Typeface font = Typeface.createFromAsset(getAssets(), "extrafine.ttf");  
    subjectTxt.setTypeface(font);
    emailTxtusfrom.setTypeface(font);
    messageTxt.setTypeface(font);

    String array_spinner[];
    array_spinner=new String[3];
    array_spinner[0]="general";
    array_spinner[1]="quisiton";
    array_spinner[2]="suggsution";

     final Spinner spinner = new Spinner(this);

        ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(
                this, android.R.layout.simple_spinner_item, array_spinner);
        spinnerArrayAdapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item );

        spinner = (Spinner) findViewById( R.id.spinner1 ); // the problem goes //here it should using final >> final spinner .. Con below >>

        spinner.setAdapter(spinnerArrayAdapter);

         spinner.getSelectedItem().toString();



                    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

                    StrictMode.setThreadPolicy(policy); 


lButton.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {

             Properties props = new Properties();
              props.put("mail.smtp.host", "smtp.gmail.com");
              props.put("mail.smtp.socketFactory.port", "465");
              props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
              props.put("mail.smtp.auth", "true");
              props.put("mail.smtp.port", "465");


              Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
                                protected PasswordAuthentication getPasswordAuthentication() {
              return new PasswordAuthentication("hesham.elnemr@gmail.com", "7323873");
              }
              });

              ;  


              try {
              Message message = new MimeMessage(session);
              message.setFrom(new InternetAddress(emailTxtusfrom.getText().toString()));
              message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("hesham.elnemr@gmail.com"));
            message.setSubject(subjectTxt.getText().toString());          
            message.setContent("bfbfdbdfrt55555"+messageTxt.getText().toString() + spinner.getSelectedItem().toString(), "text/html; charset=utf-8"); // here told me that's //spinner as above should use final note : setContent take String value .

              Transport.send(message);

              } catch (MessagingException e) {
              throw new RuntimeException(e);
              }

    }
    });









}
 }

如何使用带有微调器变量的 final 来解决 void 问题？

4

1 回答 1

0

改变

final Spinner spinner = new Spinner(this);

到

final Spinner spinner = (Spinner) findViewById( R.id.spinner1 );

由于final变量与您给它们的第一个实例相关联，因此您真的不需要制作 Spinner 来找到您正在寻找的那个。由于您希望在您的方法中创建的匿名侦听器中使用 Spinner，final因此需要。

还

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

在我看来，永远不应该使用它，它违背了 StrictMode 的目的，它迫使你的代码变得更好一点。

于 2013-02-28T00:35:55.320 回答