Android Switch Lag solution

If you want to make the app user's slide experience smooth, then you have to have a complete concept of the activity and fragment life cycle, and under what circumstances the events will be triggered.

In the project that you are currently doing, have encountered such problems, then put their own solutions listed, focusing on Onpause,onstop,onstart,onresume event processing.

Some time-consuming operations delay loading, showing the overall page first.

When switching to certain complex pages, hide and show them first, and if they are not, it is not necessary to hide them, and if they are serious, it is highly recommended to hide them and improve the user experience.

The code is as follows:

 Packagecom.hengtiansoft.mecb.fragment;Importjava.io.IOException;Importjava.util.ArrayList;Importjava.util.List;ImportAndroid.os.Bundle;ImportAndroid.os.Handler;ImportAndroid.support.v4.view.ViewPager;ImportAndroid.support.v4.view.ViewPager.OnPageChangeListener;ImportAndroid.view.LayoutInflater;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.ListView;ImportAndroid.widget.RadioButton;ImportAndroid.widget.RadioGroup;ImportAndroid.widget.Toast;ImportAndroid.widget.RadioGroup.OnCheckedChangeListener;ImportCOM.HENGTIANSOFT.MECB.R;ImportCom.hengtiansoft.mecb.adapter.FragmentTabPagerAdapter;ImportCom.hengtiansoft.mecb.adapter.ProductOnSaleAdapter;ImportCom.hengtiansoft.mecb.model.MenuProductOnSaleModel;ImportCom.viewpagerindicator.UnderlinePageIndicator; Public classMenuproductfragmentextendsbasefragment{PrivateViewpager Mvpproductpage; PrivateFragmenttabpageradapter Mtabpagerproductadapter; PrivateList<basefragment>mproducttabfragment; PrivateRadiogroup Mrgproducttab; PrivateRadioButton Mrbonsale; PrivateRadioButton Mrbforsale; PrivateRadioButton Mrboffsale; PrivateUnderlinepageindicator Mindicator; PrivateView MView; //smooth display of threads used for switching    PrivateHandler Handler =NewHandler (); @Override PublicView Oncreateview (layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {MView = Inflater.inflate (r.layout.fragment_menu_product, container,false);                Initview (MView); returnMView; } @Override Public voidOnStart () {Super. OnStart (); Handler.postdelayed (NewRunnable () { Public voidrun () {setData (MView); }        }, 200);    Setlistener (MView); } @Override Public voidOnresume () {Super. Onresume (); Handler.postdelayed (NewRunnable () { Public voidrun () {mvpproductpage.setvisibility (view.visible); }        }, 0); } @Override Public voidOnPause () {Super. OnPause (); Handler.postdelayed (NewRunnable () { Public voidrun () {mvpproductpage.setvisibility (view.invisible); }        }, 100); }        Private voidInitview (view view) {Mvpproductpage=(Viewpager) View.findviewbyid (r.id.vp_product_page); Mindicator=(Underlinepageindicator) View.findviewbyid (R.id.indicator_product_sort); Mrgproducttab=(Radiogroup) View.findviewbyid (R.id.rg_product_tab); Mrbonsale=(RadioButton) View.findviewbyid (R.id.rb_product_onsale); Mrboffsale=(RadioButton) View.findviewbyid (R.id.rb_product_offsale); Mrbforsale=(RadioButton) View.findviewbyid (R.id.rb_product_forsale); }        Private voidsetData (view view) {Mproducttabfragment=NewArraylist<basefragment>(); Mproducttabfragment.add (Newproductonsalefragment ()); Mproducttabfragment.add (Newproductforsalefragment ()); Mproducttabfragment.add (Newproductoffsalefragment ()); Mtabpagerproductadapter=NewFragmenttabpageradapter (Mproducttabfragment, Getchildfragmentmanager ());        Mvpproductpage.setadapter (Mtabpagerproductadapter); Mvpproductpage.setoffscreenpagelimit (2);        Mindicator.setviewpager (Mvpproductpage); Mindicator.setfades (false); }        Private voidSetlistener (view view) {Mrgproducttab.setoncheckedchangelistener (NewOncheckedchangelistener () {@Override Public voidOnCheckedChanged (Radiogroup arg0,intCheckedid) {                if(Checkedid = =Mrbonsale.getid ()) {Mvpproductpage.setcurrentitem (0,false); }Else if(Checkedid = =Mrbforsale.getid ()) {Mvpproductpage.setcurrentitem (1,false); }Else{Mvpproductpage.setcurrentitem (2,false);                }            }        }); Mindicator.setonpagechangelistener (NewOnpagechangelistener () {@Override Public voidOnpagescrollstatechanged (intposition) {} @Override Public voidOnpagescrolled (intARG0,floatArg1,intarg2) {} @Override Public voidOnpageselected (intposition) {                Switch(position) { Case0: mrbonsale.setchecked (true);  Break;  Case1: mrbforsale.setchecked (true);  Break;  Case2: mrboffsale.setchecked (true);  Break; default:                     Break;                            }            }        }); }}

Android Switch Lag solution