Android Tutorial -Clicking the back button twice to exit an activity

Clicking the back button twice to exit an activity

import android.widget.Toast; public class MainActivity extends AppCompatActivity {

private static final int TIME_LIMIT=2000; private long backPressedTime;

// Add the following code

@Override public void onBackPressed() { if(TIME_LIMIT+backPressedTime>System.currentTimeMillis()) { super.onBackPressed(); } else { Toast.makeText(getBaseContext(),"Press Back again to Exit",Toast.LENGTH_SHORT).show(); } backPressedTime=System.currentTimeMillis(); } }