[转]android两次按返回键退出程序实现

16lz 2021-01-23

privatestaticBooleanisExit=false;
privatestaticBooleanhasTask=false;
TimertExit=newTimer();
TimerTasktask=newTimerTask(){
@Override
publicvoidrun(){
isExit=false;
hasTask=true;
}
};
publicbooleanonKeyDown(intkeyCode,KeyEventevent){
//TODOAuto-generatedmethodstub
if(keyCode==KeyEvent.KEYCODE_BACK){
//System.out.println("userbackdown");
if(isExit==false){
isExit=true;
Toast.makeText(this,"再按一次退出程序",Toast.LENGTH_SHORT).show();
if(!hasTask){
tExit.schedule(task,2000);
}}else{
}
finish();
System.exit(0);
}
}
returnfalse;
}

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