Android Toast Tip Press two times back key to exit

1  Public classMainactivityextendsActivity {2 3 @Override4     protected voidonCreate (Bundle savedinstancestate) {5         Super. OnCreate (savedinstancestate);6 Setcontentview (r.layout.activity_main);7 8     }9 Ten     LongStartTime; One  A @Override -      Public voidonbackpressed () { -         if(System.currenttimemillis ()-StartTime < 2000) { the             Super. onbackpressed (); -}Else { -StartTime =System.currenttimemillis (); -  +Toast toast =NewToast ( This); -  +LinearLayout layout =NewLinearLayout ( This); A layout.setorientation (linearlayout.vertical); at Layout.setbackgroundcolor (color.yellow); -              -TextView TV1 =NewTextView ( This); -Tv1.settext ("Hint"); - tv1.setgravity (gravity.center); -              inTextView TV2 =NewTextView ( This); -Tv2.settext ("Press the Back button again to exit"); to tv2.setgravity (gravity.center); +              - Layout.addview (TV1); the Layout.addview (TV2); *  $ Toast.setview (layout);Panax NotoginsengToast.setgravity (gravity.center_vertical | Gravity.fill_horizontal, 0,-200); - toast.setduration (toast.length_short); the toast.show (); +  A         } the  +     } -  $}

mainactivity

Android Toast Tip Press two times back key to exit