Realizing Viewpager function with Gesturedetector

This program : Use the Android gesture event to make a picture browser.
Description : Perhaps the first to see the picture browser, everyone in mind is Viewpager bar. But in fact, with Gesturedetector can also be achieved,
The advantages are:
1. Simple.
2. Consume less memory. After the author tests, this way in 24 pictures still do not appear oom anomaly. And Viewpager, I put 7 in the mobile phone will not be.
(This method actually replaced the original picture, itself will only have a picture in memory)
3. Pictures can be stretched freely
The disadvantages are:
There is no animation effect of sliding.

As for the future choice of which way to achieve, the reader choose their own.

For a detailed usage of gesturedetector see:
http://blog.csdn.net/getchance/article/details/8478993

Steps :
1. in the view file :

<relativelayout xmlns: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 " >                <ImageViewandroid:id="@+id/imageview"android:layout_width= "Fill_parent" android:layout_height="fill_parent" />                        </relativelayout>

2. in the control file :

 PackageCom.example.imagebrowser;Importandroid.app.Activity;ImportAndroid.content.res.Resources;Importandroid.graphics.drawable.Drawable;ImportAndroid.os.Bundle;ImportAndroid.view.GestureDetector;ImportAndroid.view.MotionEvent;ImportAndroid.widget.ImageView; Public  class mainactivity extends Activity {    //data Field    Private int[] Mimageid;PrivateImageView Mimageview;Private intmcurrentposition=0;Final intMrightflag =0;Final intMleftflag =1;PrivateGesturedetector Gesturedetector;@Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main);        InitComponent ();        SetImage ();    Processgesturedetector (); }//the method is used-init UI components    Private void initcomponent() {mimageview= (ImageView) Findviewbyid (R.id.imageview); }//the method is used to set image    Private void setimage() {mimageid=New int[]{r.drawable.pic1,r.drawable.pic2,r.drawable.pic3,r.drawable.pic4, R.drawable.pic5,r.drawable.pic6,r.drawa        BLE.PIC7,R.DRAWABLE.PIC8};           Resources resources = Getbasecontext (). Getresources ();        drawable imagedrawable = resources.getdrawable (Mimageid[mcurrentposition]);    Mimageview.setbackgrounddrawable (imagedrawable); }//the method is used to process Gesturedetector    Private void Processgesturedetector() {Gesturedetector.ongesturelistener Ongesturelistener =NewGesturedetector.simpleongesturelistener () {//Instantiation Listener            @Override               Public Boolean onfling(Motionevent E1, motionevent E2,floatVelocityx,floatVELOCITYY) {floatx = E2.getx ()-E1.getx ();floaty = e2.gety ()-e1.gety ();if(X >0) {Doresult (Mrightflag); }Else if(X <0) {Doresult (Mleftflag); }return true;        }          }; Gesturedetector =NewGesturedetector (mainactivity. This, Ongesturelistener);//Use this listener to generate Gesturedetector instances}//the method Override Ontouchevent Method     Public Boolean ontouchevent(Motionevent event) {returnGesturedetector.ontouchevent (event); }//the method to handle switch Behavior:switch image     Public void Doresult(intAction) {Switch(action) { CaseMrightflag:mcurrentposition= (mcurrentposition+mimageid.length+1)%mimageid.length; SetImage (); Break; CaseMleftflag:mcurrentposition= (mcurrentposition+mimageid.length-1)%mimageid.length; SetImage (); Break; }      }  }

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Realizing Viewpager function with Gesturedetector