arrays - How to add set as wallpaper option in following code in Android -

i creating swipe action in android app. working perfectly. want create set wallpaper option user can set current image wallpaper. add code. not working. please me make current image wallpaper.

code-

public class fullimageactivity extends activity {      int position;     linearlayout full;     button btn;      public integer[] mthumbid = {                 r.drawable.kri1, r.drawable.kri2,                 r.drawable.kri3, r.drawable.kri4,                 r.drawable.kri5, r.drawable.kri6,                 r.drawable.kri7, r.drawable.kri8,                 r.drawable.kri9     };      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.full_image);          // intent data         intent = getintent();          // selected image id         position = i.getextras().getint("id");                 full = (linearlayout) findviewbyid(r.id.full);         btn = (button)findviewbyid(r.id.btn);         changebackground();         btn.setonclicklistener(new button.onclicklistener(){             @override             public void onclick(view arg0) {             wallpapermanager mywallpapermanager = wallpapermanager.getinstance(getapplicationcontext());             try {                 mywallpapermanager.setresource(mthumbid[position]);             } catch (ioexception e) {                 e.printstacktrace();            }         }});         activityswipedetector activityswipedetector = new activityswipedetector(this);         full.setontouchlistener(activityswipedetector);     }      private void changebackground(){         full.setbackgroundresource(mthumbid[position]);    }      public class activityswipedetector implements view.ontouchlistener {          static final string logtag = "activityswipedetector";         static final int min_distance = 100;         private float downx, upx;         activity activity;          public activityswipedetector(activity activity){             this.activity = activity;         }          public void onrighttoleftswipe(){             log.i(logtag, "righttoleftswipe!");             if(position < mthumbid.length - 1){                 position++;                  changebackground();             }     }          public void onlefttorightswipe(){             log.i(logtag, "lefttorightswipe!");             if(position > 0){                 position--;                 changebackground();            }         }          public boolean ontouch(view v, motionevent event) {             switch(event.getaction()){                 case motionevent.action_down: {                     downx = event.getx();                     return true;                 }                 case motionevent.action_up: {                     upx = event.getx();                      float deltax = downx - upx;                      // swipe horizontal?                     if(math.abs(deltax) > min_distance){                         // left or right                         if(deltax < 0) { this.onlefttorightswipe(); return true; }                         if(deltax > 0) { this.onrighttoleftswipe(); return true; }                     }                     else {                             log.i(logtag, "swipe " + math.abs(deltax) + " long, need @ least " + min_distance);                             return false; // don't consume event                     }                       return true;                 }             }             return false;         }     }  

did declare set wallpaper permission in androidmanifest?

<uses-permission android:name="android.permission.set_wallpaper" />