Android app exits by pressing the back key twice and android app by pressing the back key twice.

Android app exits by pressing the back key twice and android app by pressing the back key twice.

Override onKeyDown () method

System. currentTimeMillis (): the function of this method is to return the current computer time. The time expression format is the number of milliseconds between the current computer time and GMT time (Greenwich Mean Time) 00:00:00, January 1, January 1, 1970.

Private long exitTime = 0;

@ Override
Public boolean onKeyDown (int keyCode, KeyEvent event ){
If (keyCode = KeyEvent. KEYCODE_BACK
& Event. getAction () = KeyEvent. ACTION_DOWN ){

If (System. currentTimeMillis ()-exitTime)> 2000 ){
Toast. makeText (getApplicationContext (), "exit the program again ",
Toast. LENGTH_SHORT). show ();
ExitTime = System. currentTimeMillis ();
} Else {
Finish ();
System. exit (0 );
}
Return true;
}
Return super. onKeyDown (keyCode, event );
}

 

Override onBackPressed () method

@ Override
Public void onBackPressed (){
// Select the back key again within 2 seconds
If (System. currentTimeMillis ()-Mexico time> 2000 ){
Toast. makeText (this, "log out again once", Toast. LENGTH_SHORT). show ();
Mexico time = System. currentTimeMillis ();
} Else {
Finish ();
// If the value is not zero, the system exits unexpectedly! 0 indicates normal exit!
// System. exit (0 );
}
}