Press Back Again to Exit

In this tutorial we will learn, how to implement the “Press back again to exit” functionality, which only leaves the app, if you press the back button 2 times within a certain time frame. This way we won’t close our app immediatly. Have fun!

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MainActivity.java
package com.example.application.exampleapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private long backPressedTime;
    private Toast backToast;

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

    @Override
    public void onBackPressed() {
        if (backPressedTime + 2000 > System.currentTimeMillis()) {
            backToast.cancel();
            super.onBackPressed();
            return;
        } else {
            backToast = Toast.makeText(getBaseContext(), "Press back again to exit", Toast.LENGTH_SHORT);
            backToast.show();
        }

        backPressedTime = System.currentTimeMillis();
    }
}