导读：public void onBackPressed() { long nowTime = System.currentTimeMillis() ; if(nowTime - oldTime2000){ oldTime = nowTime ; Toast.makeText(this, 请双击back退出程序, Toast.LENGTH_SHORT).show() ; }else{ finish() ; } }...
public void onBackPressed() {
long nowTime = System.currentTimeMillis() ;
if(nowTime - oldTime>2000){
oldTime = nowTime ;
Toast.makeText(this, "请双击back退出程序", Toast.LENGTH_SHORT).show() ;
}else{
finish() ;
}
}
