Android Removable button

The essential

1  PackageCom.example.administrator.mystudent.ButtonMove;2 3 Importandroid.app.Activity;4 ImportAndroid.os.Bundle;5 ImportAndroid.util.DisplayMetrics;6 ImportAndroid.util.Log;7 Importandroid.view.MotionEvent;8 ImportAndroid.view.View;9 ImportAndroid.widget.Button;Ten ImportAndroid.widget.Toast; One  A ImportCOM.EXAMPLE.ADMINISTRATOR.MYSTUDENT.R; -  -  Public classButtonmoveactivityextendsActivity { the  -     PrivateButton btn1; -     Private intScreenWidth; -     Private intScreenHeight; +  - @Override +     protected voidonCreate (Bundle savedinstancestate) { A         Super. OnCreate (savedinstancestate); at Setcontentview (r.layout.activity_button_move); -  -         //displaymetrics take screen size resolution -Displaymetrics dm=getresources (). Getdisplaymetrics (); -Screenwidth=Dm.widthpixels; -Screenheight=dm.heightpixels-50; in  -BTN1 =(Button) Findviewbyid (R.ID.BTN1); toBtn1.setontouchlistener (NewMyontouchlistener ()); +  -     } the  *     classMyontouchlistenerImplementsView.ontouchlistener { $         intlastx,lasty;Panax Notoginseng  - @Override the          Public BooleanOnTouch (View V, motionevent event) { +             intEa=event.getaction (); ALOG.I ("TAG", "Touch:" +ea); the  +             Switch(EA) { -                  CaseMotionevent.action_down: $  $Lastx= (int) event.getrawx ();//gets the original x-coordinate of the touch event touch Location -Lasty= (int) Event.getrawy (); -                      Break; the  -                  CaseMotionevent.action_move:Wuyi                     intDx= (int) event.getrawx ()-Lastx; the                     intDy= (int) Event.getrawy ()-lasty; -  Wu                     intL=v.getleft () +DX; -                     intB=v.getbottom () +dy; About                     intR=v.getright () +DX; $                     intT=v.gettop () +dy; -  -                     //The following determines whether the move exceeds the screen -                     if(l<0){ AL=0; +r=l+v.getwidth (); the                     } -  $                     if(t<0){ theT=0; theb=t+v.getheight (); the                     } the  -                     if(r>screenwidth) { inR=ScreenWidth; thel=r-v.getwidth (); the                     } About  the                     if(b>screenheight) { theb=ScreenHeight; thet=b-v.getheight (); +                     } - v.layout (L, T, R, b); the BayiLastx= (int) event.getrawx (); theLasty= (int) Event.getrawy (); the Toast.maketext (Getapplicationcontext (), -"Current Location:" +l+ "," +t+ "," +r+ "," +B, - toast.length_short). Show (); the  the                     //using the Invalidate () Refresh interface (post multithreading) the v.postinvalidate (); the                      Break; -                  Casemotionevent.action_up: the                      Break; the             } the             return false;94         } the     } the  the}

Android Removable button