how to show one time toast messages in android studio

Question

I wanted to add a `toast message` when clicked on a button and I added it. Now I want show it only **one time**, that means the toast message will **not show again** if clicked on the button after the first time **also after a restart of app**.
Please help me!

Answer 1

You can do it with SharedPreferences that you store in another class like Utility.java:

public class Utility {

    public static SharedPreferences preferences(Context context) {
        return PreferenceManager.getDefaultSharedPreferences(context);
    }

    public static Boolean hasSendToast(Context context) {
        return preferences(context).getBoolean("Toast", false);
    }

    public static void setSendToast(Context context, Boolean bool) {
        preferences(context).edit()
                .putBoolean("Toast", bool).apply();
    }
}

And use it with your Toast inside the onClickListener in your MainActivity.java like this:

public class MainActivity extends AppCompatActivity {

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

        Button button = findViewById(R.id.button);
        button.setOnClickListener(v -> {
            if (!Utility.hasSendToast(getApplicationContext())) {
                Toast.makeText(getApplicationContext(), "My Toast", Toast.LENGTH_SHORT)
                        .show();
                Utility.setSendToast(getApplicationContext(), true);
            }
        });
    }
}