Android uses Viewpager to start the app with the left and right swipe interface

Android uses Viewpager to start the app with the left and right swipe interface

/**

* 1. Load the Viewpager control in the layout Android.support.v4.view.ViewPager
* 2. Initialize Viewpager
* 3. Initialization of the data source
* 4. Create an adapter---> Inherit pageradapter override 4 methods
* 5. Bind Adapter
* 6. Setting Listener Events */

1. Load the Viewpager control in the layout Android.support.v4.view.ViewPager

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Tools:context=". Mainactivity " > 　　 Add Viewpager layout     <Android.support.v4.view.ViewPager  android:id= "@+id/vpager"  A        Ndroid:background= "@drawable/guide_1"  android:layout_width= "Match_parent"  Android:layout_height= "match_parent" ></  Android.support.v4.view.ViewPager>         <ButtonAndroid:id= "@+id/enter"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentbottom= "true"Android:layout_centerhorizontal= "true"Android:layout_marginbottom= "20DP"Android:onclick= "OnEnter"android:visibility= "Gone"Android:text= "Enter" /></Relativelayout>

4. Create an adapter---> Inherit pageradapter override 4 methods
The main implementation of four methods

　　

public int GetCount ()   //Gets the number of views loaded in the view
Determines whether a page view is determined to be related to the Instantiateitem returned by a particular focus object (Viewgroup,int). The method is a pageradapter normal need.

public boolean isviewfromobject (View arg0, Object arg1)  
Add a View

Destroying views

public void Destroyitem (ViewGroup container, int position, object object)

Public class Mypageradapter extends Pageradapter {private List<View>list; Public Mypageradapter (List<View>list)    {this.list = list;    } @Override public int getcount () {return list.size ();    } @Override public boolean isviewfromobject (View arg0, Object arg1) {return arg0 = = Arg1; }/** * Add view */public Object Instantiateitem (viewgroup container, int position) {View V = list.get (        position);        Add the View object to the ViewGroup Container.addview (v);    return v; }/** * Remove view */public void Destroyitem (ViewGroup container, int position, object object) {container    . Removeview (List.get (position)); }        }

2. Initialize Viewpager
* 3. Initialization of the data source
* 5. Bind Adapter
* 6. Setting Listener Events

Public class Mainactivity extends Activity implements Onpagechangelistener {private Viewpager viewpager; Data source Private List<View>list;        Adapter private Mypageradapter Adapter;    Button Btn3;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Btn3 = (Button) Findviewbyid (r.id.enter);        Viewpager = (Viewpager) Findviewbyid (R.id.vpager); List = new ArrayList<View>();        Inindata ();        adapter = new Mypageradapter (list);        Bind adapter Viewpager.setadapter (adapter);        Set the monitoring Viewpager.setonpagechangelistener (this); /*new Handler (). postdelayed (New Runnable () {@Override public void run () {Intent in                 Tent = new Intent (mainactivity.this, One.class);                 StartActivity (Intent);            Finish ();        }}, (), */} public void Inindata () {ImageView iv1 = new ImageView (this);        Iv1.setbackgroundresource (r.drawable.guide_1);        List.add (IV1);        ImageView iv2 = new ImageView (this);        Iv2.setbackgroundresource (r.drawable.guide_2);        List.add (IV2);        ImageView iv3 = new ImageView (this);        Iv3.setbackgroundresource (R.drawable.guide_3);        List.add (IV3);        ImageView iv4 = new ImageView (this);        Iv4.setbackgroundresource (R.drawable.guide_4);    List.add (IV4); } public void OnEnter (View V) {new Handler (). Post (new Runnable () {@Override public void run () {Intent                 Intent = new Intent (mainactivity.this, one.class);                 StartActivity (Intent);            Finish ();    }        });     }/** * There are three states (0,1,2).     * Arg0 ==1 's time is sliding, * the arg0==2 of the hour of the implied sliding, * arg0==0 of the hour implied that nothing has been done.    */public void onpagescrollstatechanged (int arg0) {log.i ("tag", "onpagescrollstatechanged" +arg0); }/** * arg0: Current page, and the page you clicked to swipe arg1: percent of current page offset arg2: Pixel position of the current page offset */public void onpagescrolled (i    NT arg0, float arg1, int arg2) {log.i ("tag", "onpagescrolled" +arg0+ "--" +arg1+ "--->" +arg2);     }/** * This method is called after the page has been jumped, * arg0 is the position (position number) of the page you are currently selecting.        */public void onpageselected (int arg0) {log.i ("tag", "onpageselected" +arg0);        if (arg0 = = 3) {btn3.setvisibility (view.visible); }    }}

Use Viewpager to display the upper ad campaign, add an asynchronous task,

Use Setcurrentitem (index) to set the current page

Class Myasynctask extends Asynctask<Void, void, void>{protected void Doinbackground (void ... params) {while (true) {//Determines whether the current asynchronous task is canceled                if (iscancelled ()) {break;                    } try {thread.sleep (2000);                                    Publishprogress ();                } catch (Exception e) {e.printstacktrace ();        }} return null;            } protected void onprogressupdate (void ... values) {super.onprogressupdate (values);                Viewpager.setcurrentitem (++index%4);                    if (index==4) {Intent Intent = new Intent (mainactivity.this, One.class);                    StartActivity (Intent);                    Finish ();                    index=0;                                        Viewpager.removeallviews ();                    Viewpager.setcurrentitem (0);                  Add ();              }        }    } 

Android uses Viewpager to start the app with the left and right swipe interface