The method of dynamically adding view and realizing pseudo infinite loop in Android Viewpager _android

This article illustrates the method of dynamically adding view and realizing pseudo infinite loops in Android Viewpager. Share to everyone for your reference, specific as follows:

The use of Viewpager, we are familiar with, it can achieve sliding between the left and right, there is a demand, that is, the number of pages loaded in Viewpager is not determined, but based on the amount of data to determine. A common application is to display a picture of the news in a detailed page of the news.

Now let's take a look at the code:

Activity_main.xml

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"
  android:layout_width= "Match_ Parent "
  android:layout_height=" match_parent ">
  <android.support.v4.view.viewpager
    android:id= "@+id/list_pager"
    android:layout_width= "fill_parent"
    android:layout_height= "150DP"
    />
</ Relativelayout>

Fragment_page.xml

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  android:layout_width=" match_parent "
  android:layout_height=" Match_parent "
  android: gravity= "center"
  android:background= "#ffff44" >
  <textview
    android:id= "@+id/txt_num"
    Android:layout_width= "Fill_parent"
    android:layout_height= "fill_parent"
    android:text= "1"
    android: Textsize= "22DP"
    android:gravity= "center"/>
</LinearLayout>

Viewpageadapter.java

Import Android.support.v4.view.PagerAdapter;
Import Android.view.View;
Import Android.view.ViewGroup;
Import java.util.List;
/**
 * Created by CG on 2015/10/28.
 * * Public
class Viewpageadapter extends Pageradapter {
  private list<view> list_view;
  Public Viewpageadapter (list<view> list_view) {
    this.list_view = List_view;
  }
  @Override public
  int GetCount () {return
    integer.max_value;
  }
  @Override Public
  Boolean isviewfromobject (View view, Object object) {return
    view==object
  }
  @Override public
  Object instantiateitem (viewgroup container, int position) {
    Container.addview (list_ View.get (position% list_view.size ()));
    Return List_view.get (position% list_view.size ());
  }
  @Override public
  void Destroyitem (ViewGroup container, int position, object object) {
    Container.removeview ( List_view.get (position% list_view.size ()));
  }

Mainactivity.java

Import Android.os.Bundle;
Import Android.support.v4.view.ViewPager;
Import android.support.v7.app.AppCompatActivity;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.widget.TextView;
Import java.util.ArrayList;
Import java.util.List; /** * Dynamically add view to Viewpager and implement infinite loop/public class Mainactivity extends Appcompatactivity {private Viewpager List_page
  R
  Private list<view> List_view;
  Private Viewpageadapter Adpter;
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_main);
    List_pager = (Viewpager) Findviewbyid (R.id.list_pager);
    List_view = new arraylist<> (); This is only set to 4. Because in the implementation application, when we load the page, you will know the number of the page according to the amount of data//Generally, we will be based on the number of list<> or string[to determine how many pages for (int i=
      0;i<4;i++) {View view = Layoutinflater.from (this). Inflate (R.layout.fragment_page,null); TextView txt_num = (TextView) View.findviewbyid (r.id.txt_NUM);
      Txt_num.settext (i + "");
    List_view.add (view);
    } adpter = new Viewpageadapter (List_view);
    List_pager.setadapter (Adpter);
    At first. The current page is the first to the maximum half for circular sliding int currentitem = INTEGER.MAX_VALUE/2;
    Let the first current page be 0//currentitem = CurrentItem-((INTEGER.MAX_VALUE/2)% 4);
  List_pager.setcurrentitem (CurrentItem);

 }
}

Effect Chart:

I hope this article will help you with the Android program.