The application of--listview in simulating micro-blog

The application of the ListView in the Simulation Micro-blog

Use the ListView to do a mock-up microblogging (--------------should be done by teacher

The job requirements are implemented as follows:

Here are the effects of my own program:

Analyze the problem:

Use of 1.ListView and Listview_item

2. Entity classes

3.ListView Writing of custom adapters

4.ListView of bound data sources and controls

5. inheritance: Baseadapter

The following is my own code: (Custom adapter)

1 Package Cn.edu.bzu.adapter;2  3 import java.util.List;4  5 import cn.edu.bzu.entity.Information;6 import cn.edu.bzu.weibo_looking. R;7 import Android.content.Context;8 import Android.view.LayoutInflater;9 import Android.view.View;Ten import Android.view.ViewGroup; One import Android.widget.BaseAdapter; A import Android.widget.ImageView; - import Android.widget.TextView; -   the /** - * Custom Adapter to implement ListView display - * @author Monster - * @date: 2015-04-28 +  */ -  Public classMyadapter extends Baseadapter { +     PrivateList<information>list; A     PrivateContext Mcontext; at     PrivateLayoutinflater Minflater; -     //Defining construction Methods -      PublicMyadapter (list<information>list, Context mcontext) { - super (); -          This. List =list; -          This. Mcontext =Mcontext; in     } -   to @Override +      Public intGetCount () { -         returnlist.size (); the     } *   $ @OverridePanax Notoginseng      PublicObject GetItem (intposition) { -         returnList.Get(position); the     } +   A @Override the      Public LongGetitemid (intposition) { +         returnposition; -     } $   $ @Override -      PublicView GetView (intposition, View Convertview, ViewGroup parent) { -Viewholder holder=NULL; the         if(convertview==NULL){ -Convertview=minflater. from(Mcontext). Inflate (R.layout.listview_item,NULL);//layout into viewWuyiHolder=NewViewholder (); the             //instantiating a control -Holder. Image=(ImageView) Convertview.findviewbyid (R.ID.IV); WuHolder. Name=(TextView) Convertview.findviewbyid (r.id.name); -Holder. Time=(TextView) Convertview.findviewbyid (r.id.time); AboutHolder. contents=(TextView) Convertview.findviewbyid (r.id.contents); $Convertview.settag (holder);//setting Settag to optimize programs -}Else{ -Holder=(Viewholder) Convertview.gettag (); -         } A         //Assigning a value to a control +Holder. Image.setbackgroundresource (list.Get(position). Getimgid ()); theHolder. Name.settext (list.Get(position). GetName ()); -Holder. Time.settext (list.Get(position). GetDate ()); $Holder. Contents.settext (list.Get(position). GetContent ()); the         returnConvertview; the     } the       the     classviewholder{ - ImageView Image; in TextView Name; the TextView time; the TextView Contents; About     } the}

Analyze the problem:

In the above custom adapter Myadapter code, the GetView method is the most important, but also requires methods such as Getcount,getitem,getitemid.

The following is the Mainactivity code:

1 Package cn.edu.bzu.weibo_looking;2  3 import java.util.ArrayList;4 import java.util.List;5  6 import Cn.edu.bzu.adapter.MyAdapter;7 import cn.edu.bzu.entity.Information;8 import Android.os.Bundle;9 import Android.widget.ListView;Ten import android.app.Activity; One   A  Public classMainactivity extends Activity { -     PrivateListView ListView; -     PrivateMyadapter Adapter; the     PrivateList<information>list; - @Override -     protected voidonCreate (Bundle savedinstancestate) { - super.oncreate (savedinstancestate); + Setcontentview (r.layout.activity_main); -SetData ();//Data Source + Initview (); A     } at     Private voidInitview () { -         //Initializing the control -listview=(ListView) Findviewbyid (r.id.lv); -Listview.setadapter (adapter);//Binding Adapter -     } -     Private voidSetData () { in         //set up a data source -list=NewArraylist<information>(); toList.add (NewInformation (R.DRAWABLE.IMG1,"Wang","2015-05-08","Moonset Wu Ti Frost all over the sky")); +List.add (NewInformation (R.DRAWABLE.IMG2,"Dufu","2015-05-08","Jiangfeng Isaribi to worry about sleep")); -List.add (NewInformation (R.DRAWABLE.IMG3,"Libai","2015-05-08","Gusu City outside Hanshan Temple")); theList.add (NewInformation (R.DRAWABLE.IMG4,"Hades","2015-05-08","Midnight Bell to the passenger ship")); *Adapter=NewMyadapter (list, mainactivity. This); $     }          Panax Notoginseng}

Analyze the problem:

1. Establishment and setting of data sources

2. Control use (Initialize)

3. Bindings for adapters

　　

Simulate Weibo to see the application of--listview