one time read ACTION_MOVE on touch listener

Question

I want it to form a word on the letters with the touchlistener. But when it comes to a letter, it repeatedly writes that letter. How do I get this to be taken in one go?

So if "harf1" is written as the letter of the word, it will not be written again.

Here is the code:

linearLayout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {


                switch (event.getActionMasked()){
                    case MotionEvent.ACTION_DOWN:
                        if (isDownWord1(event.getX(),event.getY()))
                            yazi.setText("A");
                        if (isDownWord2(event.getX(),event.getY()))
                            yazi.setText("B");
                        if (isDownWord3(event.getX(),event.getY()))
                            yazi.setText("C");
                        if (isDownWord4(event.getX(),event.getY()))
                            yazi.setText("D");
                        break;
                    case MotionEvent.ACTION_MOVE:
                        if (isDownWord1(event.getX(),event.getY()))
                            yazi.setText(yazi.getText().toString() + "A");
                        if (isDownWord2(event.getX(),event.getY()))
                            yazi.setText(yazi.getText().toString() + "B");
                        if (isDownWord3(event.getX(),event.getY()))
                            yazi.setText(yazi.getText().toString() + "C");
                        if (isDownWord4(event.getX(),event.getY()))
                            yazi.setText(yazi.getText().toString() + "D");
                        break;
                    case MotionEvent.ACTION_UP:
                        yazi.setText("");
                        break;
                }
                return true;
            }
        });
    }

    public boolean isDownWord1(float x,float y){
        if(x < harf1.getRight() && x > harf1.getLeft() &&  y > harf1.getTop() && y < harf1.getBottom())
        return true;
        else
          return false;
    }

    public boolean isDownWord2(float x,float y){
        if(x < harf2.getRight() && x > harf2.getLeft() &&  y > harf2.getTop() && y < harf2.getBottom())
            return true;
        else
            return false;
    }

    public boolean isDownWord3(float x,float y){
        if(x < harf3.getRight() && x > harf3.getLeft() &&  y > harf3.getTop() && y < harf3.getBottom())
            return true;
        else
            return false;
    }

    public boolean isDownWord4(float x,float y){
        if(x < harf4.getRight() && x > harf4.getLeft() &&  y > harf4.getTop() && y < harf4.getBottom())
            return true;
        else
            return false;
    }

That's XML File:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/game_screen_bg"
    tools:context=".GameLevel1">

    <TextView
        android:id="@+id/harf1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="93dp"
        android:layout_marginLeft="93dp"
        android:layout_marginTop="475dp"
        android:text="A"
        android:textSize="50dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/harf2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="408dp"
        android:layout_marginEnd="63dp"
        android:layout_marginRight="63dp"
        android:text="B"
        android:textSize="50dp"
        app:layout_constraintEnd_toStartOf="@+id/harf3"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/harf3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="471dp"
        android:layout_marginEnd="95dp"
        android:layout_marginRight="95dp"
        android:text="C"
        android:textSize="50dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/harf4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="188dp"
        android:layout_marginRight="188dp"
        android:layout_marginBottom="114dp"
        android:text="D"
        android:textSize="50dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <TextView
        android:id="@+id/yazi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="108dp"
        android:layout_marginLeft="108dp"
        android:layout_marginTop="200dp"
        android:text="TextView"
        android:textSize="50dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:id="@+id/xxxx"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#10000000"
        android:orientation="horizontal" />

</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

Before appending a character to the yazi TextView, you just need to check whether the last character of yazi is not the same as the new character; so change the switch case of the MotionEvent.ACTION_MOVE to:

case MotionEvent.ACTION_MOVE:
    String text = yazi.getText().toString();
    String lastChar = text.substring(text.length() - 1);
    if (isDownWord1(event.getX(), event.getY()) && !lastChar.equals("A"))
        yazi.setText(yazi.getText().toString() + "A");
    if (isDownWord2(event.getX(), event.getY()) && !lastChar.equals("B"))
        yazi.setText(yazi.getText().toString() + "B");
    if (isDownWord3(event.getX(), event.getY()) && !lastChar.equals("C"))
        yazi.setText(yazi.getText().toString() + "C");
    if (isDownWord4(event.getX(), event.getY()) && !lastChar.equals("D"))
        yazi.setText(yazi.getText().toString() + "D");
    break;