如何更改单击的按钮的颜色，但使其只能同时更改一个按钮的颜色？

Question

How can I make it so that instead of displaying text whenever a button is clicked, instead the background color of each button changes and only one button can be that color at the same time?

package com.example.scrolltes1;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.KeyEventDispatcher;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import static android.graphics.Color.BLUE;
import static android.graphics.Color.GRAY;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    boolean constrain = true;

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


        Button button1 = findViewById(R.id.button1);
        Button button2 = findViewById(R.id.button2);
        Button button3 = findViewById(R.id.button3);

        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
            switch (v.getId()) {
                case R.id.button1:
                    Toast.makeText(this, "Button 1 clicked", Toast.LENGTH_SHORT).show();
                    break;
                case R.id.button2:
                    Toast.makeText(this, "Button 2 clicked", Toast.LENGTH_SHORT).show();
                    break;
                case R.id.button3:
                    Toast.makeText(this, "Button 3 clicked", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    }

would it just be possible to replace everything inside of the Toast.makeText parenthesis with something that changes background color?

Answer 1

you could create a custom layout with a specific color for each button:

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.button1
        Toast ToastMessage = Toast.makeText(this,"Button 1 clicked", Toast.LENGTH_SHORT);
        View toastView = ToastMessage.getView();
        toastView.setBackgroundResource(R.layout.custom_color);
        ToastMessage.show();
        break;

    // more cases
    }
   }

See this article for more details about the solution: https://www.android-examples.com/change-toast-message-background-color-in-android/

If this helps, don't hesitate to accept it as an answer:)