Duplicate focus when using requestFocus in an Edittext

Question

I created a screen with 2 fields EditText, one with numerical input and another text. What I want is to execute a validation in the first field when it loses focus, and if invalid, return the focus to this first field to be written.

The problem is when I use .requestfocus(), the two fields stay with the focus cursor, even using .clearfocus() in the second field, the cursor is only in the first but if I type something it takes the keyboard and the input of the data in the second field.

For me it should be obvious when requesting the focus of a field, this be selected assuming its settings and automatically disable the other. I put down a very simple example. I thank anyone who can enlighten me.

package com.example.android.teste;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
EditText numero, texto;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    numero = findViewById(R.id.editText);
    texto = findViewById(R.id.editText2);
    numero.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if (!b) {
            //Executo uma validação e conforme resultado inválido retorno no campo para redigitar.
            numero.requestFocus();
            }
        }
    });
    }
}

<EditText
    android:id="@+id/editText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="32dp"
    android:ems="10"
    android:inputType="number"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="32dp"
    android:ems="10"
    android:inputType="textPersonName"
    android:text="Name"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/editText" />

Answer 1

Trade it for something like this:

public class MainActivity extends AppCompatActivity {
    EditText numero, texto;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        numero = findViewById(R.id.editText);
        texto = findViewById(R.id.editText2);

        texto.setOnFocusChangeListener((view, hasFocus) -> {
            if (!numeroPassouNaValidacao() && hasFocus) {
                view.clearFocus();
                esconderTeclado(view);
                numero.requestFocus();
                mostrarTeclado(numero);
            }
        });

    }

    private boolean numeroPassouNaValidacao() {
        return false;
    }


    private void esconderTeclado(View view) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }

    private void mostrarTeclado(View view) {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(view, 0);
    }



}

What you solved was a combination of passing the Systener to the other Edittext (which can work if there are several fields, but it was the only way you solved), applying clearFocus() in the View that just received the focus, hide the keyboard manually (otherwise it stays on the screen), do the requestFocus() in the number field and show the keyboard.