Den Fokus in EditText einstellen.

package mercator.mobilepos.android.metricgroup.com.mercator;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.DialogInterface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.text.InputType;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import mercator.mobilepos.android.metricgroup.com.mercator.Database.UserDataSource;
import mercator.mobilepos.android.metricgroup.com.mercator.Entities.UserFromMaster;


public class LoginActivity extends AppCompatActivity implements View.OnKeyListener {

    private EditText mETUserNumber;
    private EditText mETPwt;
    private TextView mTVUserName;
    public int userIndetifier;
    final Context context = this;
    public static String BEDIENER = "";





    UserFromMaster userMaster = null;
    PublicFunction pfct = new PublicFunction();
    UserDataSource dataSource = new UserDataSource(this);

    @Override
    public boolean onKey(View viewUser, int keyCode, KeyEvent keyEvent)
    {
        String userPassword = mETPwt.getText().toString();
        if (viewUser == mETPwt)
        {
            if (keyEvent.getAction() == KeyEvent.ACTION_DOWN)
            {
                switch (keyCode)
                {
                    case KeyEvent.KEYCODE_ENTER:
                        if (false == mETPwt.getText().toString().isEmpty())
                        {
                            userIndetifier = Integer.parseInt(mETUserNumber.getText().toString());
                            String suchwert = mETUserNumber.getText().toString();
                            userMaster = dataSource.getUserDataFromMaster(suchwert);
                            PublicFunction.USER_IDENTIFIER = userIndetifier;
                            if(userMaster != null) {

                                if (userPassword.equals(userMaster.userPwt)) {
                                    PublicFunction.USER_IDENTIFIER = userIndetifier;
                                    SearchUserAndShow();
                                    Intent i = new Intent();
                                    i.setClass(getApplicationContext(), MainActivity.class);
                                    startActivity(i);
                                    this.finish();
                                } else {
                                    ShowMessage("Falsches Passwort!");
                                }
                            }
                            else
                            {
                                ShowMessage("Falsche Bedienernummer!");
                            }
                            return true;
                        }
                        else
                        {
                            ShowMessage("Bitte Passwort eingeben!");
                        }

                        break;
                }
            }

        }

        else if (viewUser == mETUserNumber)
        {
            if (keyEvent.getAction() == KeyEvent.ACTION_DOWN)
            {
                switch (keyCode)
                {

                    case KeyEvent.KEYCODE_ENTER:
                        if (false == mETUserNumber.getText().toString().isEmpty())
                        {
                            userIndetifier = Integer.parseInt(mETUserNumber.getText().toString());
                            if (true == pfct.isValidInput(mETUserNumber.getText().toString()))
                            {
                                PublicFunction.USER_IDENTIFIER = userIndetifier;
                                if (mETUserNumber.getText().length() >= 1)
                                {
                                    SearchUserAndShow();

                                }
                                else
                                {
                                    ShowMessage("Passwort zu kurz!");
                                    mETPwt.setText("");
                                }
                            }
                            else
                            {
                                ShowMessage(getString(R.string.invalid_amount));
                            }

                            return true;
                        }

                        else
                        {
                            ShowMessage("Bitte Benutzernummer eingeben!");
                        }
                        break;
                }
            }
        }

        return false;

    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dialog_login);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT);



        Button buttonClose = (Button) findViewById(R.id.btn_close);
        buttonClose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder alert = new AlertDialog.Builder(context);
                alert.setTitle("Verlassen der Anwendung!");
                alert.setMessage("Geben Sie bitte das Passwort ein!");


                final EditText input = new EditText(context);

                input.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_PASSWORD);
                alert.setView(input);

                alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {

                        String srt = input.getEditableText().toString();
                        if (srt.equals("..."))
                        {
                            finish();
                        }
                        else  if (true == srt.isEmpty())
                        {
                            ShowMessage("Kein Passwort eingegeben!");
                        }

                        else if (!srt.equals("..."))
                        {
                            ShowMessage("Falsches Passwort!");

                        }
                    }
                });
                alert.setNegativeButton("Abbrechen", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {

                        dialog.cancel();
                    }
                });
                AlertDialog alertDialog = alert.create();
                alertDialog.show();
            }


        });


        Button buttonLogin = (Button) findViewById(R.id.btn_login);

        buttonLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                if (true == mETUserNumber.getText().toString().isEmpty())
                {
                    ShowMessage("Keine Personalnummer eingegeben!");


                }
                else
                {
                    userIndetifier = Integer.parseInt(mETUserNumber.getText().toString());

                }
                String suchwert = mETUserNumber.getText().toString();
                userMaster = dataSource.getUserDataFromMaster(suchwert);
                String userPassword = mETPwt.getText().toString();

                if (null != userMaster) {
                    if (true == pfct.isValidInput(mETUserNumber.getText().toString())) {
                        PublicFunction.USER_IDENTIFIER = userIndetifier;
                        SearchUserAndShow();

                        if (userPassword.equals(userMaster.userPwt)) {
                            Intent i = new Intent();
                            i.setClass(getApplicationContext(), MainActivity.class);
                            startActivity(i);
                            finish();

                        } else {

                            if (mETPwt.getText().toString().equals("")) {
                                ShowMessage("Bitte Passwort eingeben!");
                            } else {
                                ShowMessage("Falsches Passwort!");
                            }
                        }



                    }
                }
                if (null == userMaster && false == mETUserNumber.getText().toString().isEmpty()
                        && (mETPwt.getText().toString().equals("") || true == mETPwt.getText().toString().isEmpty()) )
                {
                    ShowMessage("Falsche Personalnummer!");
                }
                else if (null == userMaster && false == mETUserNumber.getText().toString().isEmpty()
                        && !mETPwt.equals(""))
                {
                    ShowMessage("Falsche Personalnummer und falsches Passwort!");
                }
            }


        });



        mETUserNumber = (EditText) findViewById(R.id.et_usernumber);
        mETPwt = (EditText) findViewById(R.id.et_pwt);
        mTVUserName = (TextView) findViewById(R.id.tv_user_name);

        mETPwt.setOnKeyListener(this);
        mETPwt.setFocusableInTouchMode(true);
        mETUserNumber.setFocusableInTouchMode(true);
        mETUserNumber.setOnKeyListener(this);

       
    }


    private void SearchUserAndShow()
    {
        String suchwert = mETUserNumber.getText().toString();
        userMaster = dataSource.getUserDataFromMaster(suchwert);

        if (null != userMaster)
        {
            mTVUserName.setText(userMaster.userName);
            BEDIENER = mTVUserName.getText().toString();

            if (true == mETPwt.getText().toString().isEmpty())
            {
                mETPwt.setEnabled(true);
                mETUserNumber.clearFocus();
                mETUserNumber.requestFocus(View.FOCUS_DOWN);

            }
        }
        else
        {
            mETPwt.setEnabled(true);
            mETUserNumber.clearFocus();
            mETUserNumber.requestFocus(View.FOCUS_DOWN);
        }
    }
    private void ShowMessage(String msg)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        builder.setMessage(msg)
                .setTitle(R.string.dialog_title)
                .setIcon(R.drawable.ic_achtung)
                .setCancelable(false)
        ;

        MediaPlayer mp = MediaPlayer.create(this, R.raw.fehler);
        mp.start();

        builder.setPositiveButton(R.string.ok_btn, new DialogInterface.OnClickListener()
        {
            public void onClick(DialogInterface dialog, int id)
            {
                mETUserNumber.requestFocus();
                mTVUserName.setText("");
                mETPwt.setText("");
            }
        });

        AlertDialog dialog = builder.create();
        dialog.show();
    }
}

EditText test = (EditText) findViewById(R.id.et_pwt);
        test.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (hasFocus) {
                    SearchUserAndShow();
                } else {
                    Toast.makeText(getApplicationContext(), "lost the focus", Toast.LENGTH_LONG).show();
                }
            }
        });