Android implements picture automatic carousel and supports gesture left and right infinite sliding _android

Source: Internet
Author: User
Tags object object set background static class

No more nonsense to say, first to everyone on the left and right infinite sliding code.

1. Left and right infinite sliding

public class Mainactivity extends Appcompatactivity {private static Viewpager Viewpager; private radiogroup Group;//Picture Capital
Source, the actual project needs to be obtained from the network private int[] Imageids = {r.drawable.ym1, r.drawable.ym2, r.drawable.ym3, r.drawable.ym4};
An array of stored pictures private list<imageview> mlist;
The current index position and the previous index position private static int index = 0, Preindex = 0;
Whether to require a carousel flag private Boolean iscontinue = true;
Timer, used to implement the carousel private Timer timer = new timer ();
Private MyHandler Mhandler; public static class MyHandler extends Handler {private weakreference<mainactivity> weakreference, public MyHandler (mainactivity activity)
{weakreference = new weakreference<> (activity);} @Override public void Handlemessage (message msg) {if (weakreference.get ()!= null) {index++; Viewpager.setcurrentitem
DEX);
Super.handlemessage (msg); }} @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (
R.layout.activity_main);
Initview ();
InitData ();
AddListener (); //Let the current picture be located in the middle of the position in order to begin to be able to slide viewpager.setcurrentitem (imageids.length * 100);
Initradiobutton (imageids.length); Note that this sentence and the above order can not be written back, otherwise the first dot will not display the selected state Startswitch (); /** * Initialization control/public void Initview () {Viewpager = (Viewpager) Findviewbyid (r.id.viewpager); group = (Radiogroup) findv
Iewbyid (R.id.group); /** * Initialization data */public void InitData () {mlist = new arraylist<> (); Viewpager.setadapter (pageradapter); Mhandler =
New MyHandler (this);
/** * Add listener/public void AddListener () {Viewpager.addonpagechangelistener (Onpagechangelistener);
Viewpager.setontouchlistener (Ontouchlistener); /** * do picture carousel/public void Startswitch () {//Perform timed task Timer.schedule (new TimerTask () {@Override public void run () {//First
To determine if a carousel is needed, we're sending a message if (iscontinue) {mhandler.sendemptymessage (1);}}
}, 3000, 3500);//delay 3 seconds, send messages every 3.5 seconds; /** * Based on the number of pictures to initialize the button * @param length picture is the set of the long * * private void Initradiobutton (int length) {for (int i = 0; i < length; i++) {ImageView ImageView = new ImageView (this); imageView.setimageresource (R.drawable.rg_selector)//Set Background selector imageview.setpadding (20, 0, 0, 0);//Set the spacing between each button/ Add the button to the Radiogroup Group.addview (ImageView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_
CONTENT);
The first button is selected by default because the first picture Group.getchildat (0) is displayed by default. setenabled (FALSE); }/** * Based on current touch events to determine whether to carousel/view.ontouchlistener Ontouchlistener = new View.ontouchlistener () {@Override public boolean Ontouch (View V, motionevent event) {switch (event.getaction ()) {//Stop the picture when the finger is pressed and scratched MotionEvent.ACTION_DOWN:case M
OtionEvent.ACTION_MOVE:isContinue = false;
Break
Default:iscontinue = true;
Return false;//Note that only false can be returned, if the return True,dwon will consume the event, move cannot get the event,//cause the picture cannot slide}}; /** * According to the currently selected page Settings button selected/Viewpager.onpagechangelistener Onpagechangelistener = new Viewpager.onpagechangelistener () {@ Override public void onpagescrolled (int position, float positionoffset, int positionoffsetpixels) {} @Override public voi d onpageselected (int position) {index = position;//current position assignment to index setCurrentdot (index% imageids.length);//Because there are only four buttons, so here we want to the length area, guaranteed range of 0 to 4} @Override public void onpagescrollstatechanged (int state)
{
}
}; /** * Set the status of the corresponding position button * @param i current position */private void Setcurrentdot (int i) {if (Group.getchildat (i)!= null) {Group.getchild at (i). SetEnabled (FALSE)//The current button is selected to display the blue} if (Group.getchildat (preindex)!= null) {Group.getchildat (Preindex). SetEnabled (TRUE);//Last unchecked. Show Gray Preindex = i;//current position to previous, continue next Carousel}} pageradapter Pageradapter = new Pageradapter () {@Override public int getcount ()
{//Returns a larger value in order to implement an infinite round-broadcast return integer.max_value;} @Override public boolean isviewfromobject (view view, Object object) {return View = = object;} @Override public Object ins Tantiateitem (ViewGroup container, int position) {position = position% imageids.length;//Because the position is very large,
The position we need cannot be larger than the picture set length//So imageview ImageView = new ImageView (mainactivity.this);
Imageview.setimageresource (Imageids[position]);
Imageview.setscaletype (ImageView.ScaleType.FIT_XY); Container.addvIew (ImageView);
Mlist.add (ImageView);
return ImageView; @Override public void Destroyitem (ViewGroup container, int position, object) {//note do not do anything here, because we need to slide to the left, otherwise it will produce I
Ndexoutofboundsexception}}; @Override protected void OnDestroy () {Super.ondestroy ();//Cancel Timer if (timer!= null) {preindex = 0; Timer.cancel ()
; }
}
}

2. One-way sliding

public class Mainactivity extends Appcompatactivity {private static Viewpager Viewpager; private radiogroup Group;//Picture Capital
Source, the actual project needs to be obtained from the network private int[] Imageids = {r.drawable.ym1, r.drawable.ym2, r.drawable.ym3, r.drawable.ym4};
An array of stored pictures private list<imageview> mlist;
The current index position and the previous index position private static int index = 0, Preindex = 0;
Whether to require a carousel flag private Boolean iscontinue = true;
Timer, used to implement the carousel private Timer timer = new timer ();
Private MyHandler Mhandler; public static class MyHandler extends Handler {private weakreference<mainactivity> weakreference, public MyHandler (mainactivity activity)
{weakreference = new weakreference<> (activity);} @Override public void Handlemessage (message msg) {if (weakreference.get ()!= null) {index++; Viewpager.setcurrentitem
DEX);
Super.handlemessage (msg); }} @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (
R.layout.activity_main);
Initview ();
InitData ();
AddListener (); InItradiobutton (imageids.length);
Startswitch (); /** * Initialization control/public void Initview () {Viewpager = (Viewpager) Findviewbyid (r.id.viewpager); group = (Radiogroup) findv
Iewbyid (R.id.group); /** * Initialization data */public void InitData () {mlist = new arraylist<> (); Viewpager.setadapter (pageradapter); Mhandler =
New MyHandler (this);
/** * Add listener/public void AddListener () {Viewpager.addonpagechangelistener (Onpagechangelistener);
Viewpager.setontouchlistener (Ontouchlistener); /** * do picture carousel/public void Startswitch () {//Perform timed task Timer.schedule (new TimerTask () {@Override public void run () {//First
To determine if a carousel is needed, we're sending a message if (iscontinue) {mhandler.sendemptymessage (1);}}
}, 3000, 3500);//delay 3 seconds, send messages every 3.5 seconds; /** * Based on the number of pictures to initialize the button * @param length picture is the set of the long * * private void Initradiobutton (int length) {for (int i = 0; i < length;
i++) {ImageView ImageView = new ImageView (this); Imageview.setimageresource (r.drawable.rg_selector);//Set Background selector Imageview.setpadding (20, 0, 0, 0)//Set the spacing between each button//Add the button to theRadiogroup Group.addview (ImageView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
The first button is selected by default because the first picture Group.getchildat (0) is displayed by default. setenabled (FALSE); }/** * Based on current touch events to determine whether to carousel/view.ontouchlistener Ontouchlistener = new View.ontouchlistener () {@Override public boolean Ontouch (View V, motionevent event) {switch (event.getaction ()) {//Stop the picture when the finger is pressed and scratched MotionEvent.ACTION_DOWN:case M
OtionEvent.ACTION_MOVE:isContinue = false;
Break
Default:iscontinue = true;
Return false;//Note that only false can be returned, if the return True,dwon will consume the event, move cannot get the event,//cause the picture cannot slide}}; /** * According to the currently selected page Settings button selected/Viewpager.onpagechangelistener Onpagechangelistener = new Viewpager.onpagechangelistener () {@ Override public void onpagescrolled (int position, float positionoffset, int positionoffsetpixels) {} @Override public voi d onpageselected (int position) {index = position;//current position assignment to index Setcurrentdot (index% imageids.length);//Because there are only four buttons, So we're here to the length area, guaranteed range 0 to 4} @Override public void OnpagescrollstatechanGED (int state) {}}; /** * Set the status of the corresponding position button * @param i current position */private void Setcurrentdot (int i) {if (Group.getchildat (i)!= null) {Group.getchild at (i). SetEnabled (FALSE)//The current button is selected to display the blue} if (Group.getchildat (preindex)!= null) {Group.getchildat (Preindex). SetEnabled (TRUE);//Last unchecked. Show Gray Preindex = i;//current position to previous, continue next Carousel}} pageradapter Pageradapter = new Pageradapter () {@Override public int getcount ()
{//Returns a larger value in order to implement an infinite round-broadcast return integer.max_value;} @Override public boolean isviewfromobject (view view, Object object) {return View = = object;} @Override public Object ins Tantiateitem (ViewGroup container, int position) {position = position% imageids.length;//Because the position is very large,
The position we need cannot be larger than the picture set length//So imageview ImageView = new ImageView (mainactivity.this);
Imageview.setimageresource (Imageids[position]);
Imageview.setscaletype (ImageView.ScaleType.FIT_XY);
Container.addview (ImageView);
Mlist.add (ImageView);
return ImageView; @Override public void Destroyitem (ViewGroup container, INT position, object) {Container.removeview (Mlist.get (position));}; @Override protected void OnDestroy () {Super.ondestroy ();//Cancel Timer if (timer!= null) {preindex = 0; index = 0; Tim
Er.cancel (); }
}
}

3. Add a picture to the Judgment (final version)

public class Mainactivity extends Appcompatactivity {private static Viewpager Viewpager; private radiogroup Group;//Picture Capital
Source, the actual project needs to be obtained from the network//private int[] Imageids = {r.drawable.ym1, r.drawable.ym2, r.drawable.ym3, r.drawable.ym4};
Private int[] Imageids = {R.DRAWABLE.YM1};
An array of stored pictures private list<imageview> mlist;
The current index position and the previous index position private static int index = 0, Preindex = 0;
Whether to require a carousel flag private Boolean iscontinue = true;
Timer, used to implement the carousel private Timer timer = new timer ();
Private MyHandler Mhandler; public static class MyHandler extends Handler {private weakreference<mainactivity> weakreference, public MyHandler (mainactivity activity)
{weakreference = new weakreference<> (activity);} @Override public void Handlemessage (message msg) {if (weakreference.get ()!= null) {index++; Viewpager.setcurrentitem
DEX);
Super.handlemessage (msg); }} @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_main);
Initview ();
InitData ();
AddListener ();
Initradiobutton (imageids.length); Note that this sentence and the above order can not be written back, otherwise the first dot will not display the selected state Startswitch (); /** * Initialization control/public void Initview () {Viewpager = (Viewpager) Findviewbyid (r.id.viewpager); group = (Radiogroup) findv
Iewbyid (R.id.group); /** * Initialization data */public void InitData () {mlist = new arraylist<> (); Viewpager.setadapter (pageradapter); Mhandler =
New MyHandler (this);
/** * Add listener/public void AddListener () {Viewpager.addonpagechangelistener (Onpagechangelistener);
Viewpager.setontouchlistener (Ontouchlistener); /** * do picture carousel/public void Startswitch () {//Perform timed task Timer.schedule (new TimerTask () {@Override public void run () {//First
To determine if a carousel is needed, we're sending a message if (iscontinue) {if (imageids.length!=1)//More than one picture is Carousel mhandler.sendemptymessage (1);}
}, 3000, 3500);//delay 3 seconds, send messages every 3.5 seconds; /** * Based on the number of pictures to initialize the button * @param length picture is the set of the long * * private void Initradiobutton (int length) {for (int i = 0; i < length; i++) {ImageView ImageView = new ImageView (this); if (length = = 1) {imageview.setvisibility (view.gone); return;} imageview.setimageresource (R.drawable.rg_selector); Set the background selector imageview.setpadding (20, 0, 0, 0);//Set the spacing between each button//Add the button to the Radiogroup Group.addview (ImageView,
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
The first button is selected by default because the first picture Group.getchildat (0) is displayed by default. setenabled (FALSE); }/** * Based on current touch events to determine whether to carousel/view.ontouchlistener Ontouchlistener = new View.ontouchlistener () {@Override public boolean Ontouch (View V, motionevent event) {switch (event.getaction ()) {//Stop the picture when the finger is pressed and scratched MotionEvent.ACTION_DOWN:case M
OtionEvent.ACTION_MOVE:isContinue = false;
Break
Default:iscontinue = true; } if (imageids.length = = 1) {return TRUE;//1 picture does not allow sliding} returns false;//Note that only false can be returned, if the return True,dwon will consume the event, move cannot get the event,//
Cause the picture cannot be slid}}; /** * According to the currently selected page Settings button selected/Viewpager.onpagechangelistener Onpagechangelistener = new Viewpager.onpagechangelistener () {@ Override public void onpagescrolled (int position, float Positionoffset, int positionoffsetpixels) {} @Override public void onpageselected (int position) {index = position;//current position assigned to index Setcurre Ntdot (index% imageids.length);//Because there are only four buttons, so here we want to the length area, guaranteed range of 0 to 4} @Override public void onpagescrollstatechanged (int
State) {}}; /** * Set the status of the corresponding position button * @param i current position */private void Setcurrentdot (int i) {if (Group.getchildat (i)!= null) {Group.getchild at (i). SetEnabled (FALSE)//The current button is selected to display the blue} if (Group.getchildat (preindex)!= null) {Group.getchildat (Preindex). SetEnabled (TRUE);//Last unchecked. Show Gray Preindex = i;//current position to previous, continue next Carousel}} pageradapter Pageradapter = new Pageradapter () {@Override public int getcount ()
{//Returns a larger value in order to implement an infinite round-broadcast return integer.max_value;} @Override public boolean isviewfromobject (view view, Object object) {return View = = object;} @Override public Object ins Tantiateitem (ViewGroup container, int position) {position = position% imageids.length;//Because the position is very large, And the position we need cannot be larger than the picture set length//So imageview ImageView = new ImageView (mainactivity.this);
Imageview.setimageresource (Imageids[position]);
Imageview.setscaletype (ImageView.ScaleType.FIT_XY);
Container.addview (ImageView);
Mlist.add (ImageView);
return ImageView; @Override public void Destroyitem (ViewGroup container, int position, object) {//note do not do anything here, because we need to slide to the left, otherwise it will produce I
Ndexoutofboundsexception Container.removeview (mlist.get (position));
}
}; @Override protected void OnDestroy () {Super.ondestroy ();//Cancel Timer if (timer!= null) {preindex = 0; index = 0; Tim
Er.cancel (); }
}
}

The above is a small set to introduce the Android image automatic carousel and support gestures around infinite sliding, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!

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