#23 안드로이드 스튜디오 뒤로가기 두번눌러 앱 종료 (android onBackPressed) 예제 [ 홍드로이드 ]

< MainActivity.java >

package com.example.backbuttonexample;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
 
    private long backBtnTime = 0;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
 
 
    @Override
    public void onBackPressed() {
        long curTime = System.currentTimeMillis();
        long gapTime = curTime - backBtnTime;
 
        if(0 <= gapTime && 2000 >= gapTime) {
            super.onBackPressed();
        }
        else {
            backBtnTime = curTime;
            Toast.makeText(this, "한번 더 누르면 종료됩니다.",Toast.LENGTH_SHORT).show();
        }
 
 
    }
}