如何在Android对话框中显示用户输入的EditText值

Question

my modified sample of my work basically below i have 2 editboxes i want the values of the both to be shown in an alertbox, rest of the code works fine, the alertbox does show up but without the entered values.

public class Main extends Activity {

    EditText username = null;
    EditText password = null;
    Button login;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        EditText usern = (EditText) findViewById(R.id.username);
        EditText pass = (EditText) findViewById(R.id.password);
        Button login = (Button) findViewById(R.id.login);
        String usernm = usern.getText().toString();
        String passnm = pass.getText().toString();
        final Builder alert = new AlertDialog.Builder(this)
            .setTitle("SHOW FIELDS")
            .setMessage("USERNAME:" + usernm + "  PASSWORD:" + passnm)
            .setNegativeButton("CLOSE", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) { 
                    // do nothing
                    closeContextMenu();
                }
             });
         login.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 alert.show();
             }
         });

Answer 1

you will need to get EditText's value on button so show in AlertDialog as :

login.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
          usernm = usern.getText().toString();
          passnm = pass.getText().toString();
             alert.show();
         }

and declare both usernm and passnm at class level

EDIT : or best way create a method to show alert and call it on button click as:

  public void showalert(){
          usernm = usern.getText().toString();
          passnm = pass.getText().toString();
          alert = new AlertDialog.Builder(Main.this)
            .setTitle("SHOW FIELDS")
            .setMessage("USERNAME:" + usernm + "  PASSWORD:" + passnm)
            .setNegativeButton("CLOSE", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) { 
                    // do nothing
                    closeContextMenu();
                }
             });
     alert.show();
    }

and call this method on button click as:

 login.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
        showalert();
     }:
 });

and declare all variables at class level by which you can access it in whole class as :

public class Main extends Activity {
EditText usern ;
EditText pass ;
Button login;

String usernm ,passnm; //<<< Declare here
Builder alert;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
     usern = (EditText) findViewById(R.id.username);
     pass = (EditText) findViewById(R.id.password);
     login = (Button) findViewById(R.id.login);

         login.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
              showalert();
         }
     });
 }