Make button show Toast message only once for subsequent presses

Question

I am very new to android and this is my first day doing it. I am creating this app which has 2 buttons and is responsible for changing the color of the layout once it is pressed. As the button is pressed, I am using Toast class to display a message saying that the color is changed. But I want the logic to be such that the toast message for a particular button is displayed only once and not for subsequent same button presses. To do this I used a boolean flag and as soon as the button is clicked, changed the boolean variable to false and then not display the toast message. But there is a problem in this logic. The app will not display the toast message for future clicks. I would really appreciate if anyone would help me a little bit in this logic so that the app would know be smart enough to handle future presses.

public class MainActivity extends AppCompatActivity {
    private Button myblue_button;
    private Button mygreen_button;
    private LinearLayout backGround;
    private TextView textArea;
    boolean forBLue = true;
    boolean forGreen = true;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    textArea = (TextView) findViewById(R.id.textID); //id for text area to later change it
    backGround = (LinearLayout) findViewById(R.id.linearlayoutID);
    myblue_button = (Button) findViewById(R.id.blue_button);
    myblue_button.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View view) {
            backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_bright));
            textArea.setText("Now we feel blue");
            if (forBLue == true){
                Toast.makeText(MainActivity.this,"Now we feel blue",Toast.LENGTH_SHORT).show();
                forBLue = false;
            }
        }
    });

    mygreen_button = (Button) findViewById(R.id.green_button);
    mygreen_button.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
            textArea.setText("Now we feel green");
            if (forGreen == true) {
                Toast.makeText(MainActivity.this, "Now we feel green", Toast.LENGTH_SHORT).show();
                forGreen = false;
            }
        }
    });
}
}

Following is the XML file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearlayoutID"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>

<TextView
    android:id = "@+id/textID"
    android:text="Click the button that best represents your mood"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    />
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"

    >
<Button
    android:id="@+id/blue_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="BLUE"
    android:layout_weight="1"
    />
<Button
    android:id="@+id/green_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="GREEN"
    android:layout_weight="1"
    />
</LinearLayout>>

Answer 1

Do it like this:

boolean shouldShowToastOnBlue = true;
boolean shouldShowToastOnGreen = true;

...

myblue_button.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View view) {
        backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_bright));
        textArea.setText("Now we feel blue");
        if (shouldShowToastOnBlue){
            Toast.makeText(MainActivity.this,"Now we feel blue",Toast.LENGTH_SHORT).show();
            shouldShowToastOnBlue = false;
        }
        shouldShowToastOnGreen = true;
    }
});

mygreen_button = (Button) findViewById(R.id.green_button);
mygreen_button.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View view) {
        backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
        textArea.setText("Now we feel green");
        if (shouldShowToastOnGreen) {
            Toast.makeText(MainActivity.this, "Now we feel green", Toast.LENGTH_SHORT).show();
            shouldShowToastOnGreen = false;
        }
        shouldShowToastOnBlue = true;
    }
});

Answer 2

You need to do this :

if (forBLue == true){
                Toast.makeText(MainActivity.this,"Now we feel blue",Toast.LENGTH_SHORT).show();
                forBLue = false;
                forGreen = true ;//edit here
            }

and :

if (forGreen == true) {
                Toast.makeText(MainActivity.this, "Now we feel green", Toast.LENGTH_SHORT).show();
                forGreen = false;
                forBlue = true;//edit here
            }

Answer 3

private int blue, green = 0;

myblue_button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_blue_bright));
                textArea.setText("Now we feel blue");
                if (blue == 0){
                    Toast.makeText(MainActivity.this,"Now we feel blue",Toast.LENGTH_SHORT).show();
                    blue = 1;
                    green = 0;
                }
            }
        });

        mygreen_button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                backGround.setBackgroundColor(getResources().getColor(android.R.color.holo_green_light));
                textArea.setText("Now we feel green");
                if (green == 0) {
                    Toast.makeText(MainActivity.this, "Now we feel green", Toast.LENGTH_SHORT).show();
                    green = 1;
                    blue = 0;
    }
            }
        });
    }
    }

Here is a code this will fix your problem.