Android实现桌面悬浮小火箭效果

本文实例为大家分享了android实现悬浮小火箭效果的具体代码，供大家参考，具体内容如下

思路

使用serivce在后台启动小火箭
小火箭使用windowmanager实现。
用ontoch监听实现小火箭的拖拽。

代码实现

public class rocketservice extends service {

   private windowmanager mwm;
   private view view;
   private int startx ;
   private int starty ;
   private layoutparams params;

   @override
   public ibinder onbind(intent intent) {
      return null ;
   }

   @override
   public void oncreate() {
      super .oncreate();
     system. out .println("服务创建。。。。" );
      mwm = (windowmanager) getsystemservice(window_service );
      winwidth = mwm.getdefaultdisplay(). getwidth();
      winheight = mwm .getdefaultdisplay().getheight ();

      params = new windowmanager.layoutparams();
      params. height = windowmanager.layoutparams.wrap_content ;
      params. width = windowmanager.layoutparams.wrap_content ;
      params. flags = windowmanager.layoutparams.flag_keep_screen_on
          | windowmanager.layoutparams.flag_not_focusable ;
      params. format = pixelformat. translucent ;
      params. type = windowmanager.layoutparams.type_phone ;
      params. gravity = gravity. left + gravity. top;

      view = layoutinflater.from( this).inflate(r.layout. rocket , null );
      //拿到 imageview，设置帧动画
     imageview ivrocket = (imageview) view .findviewbyid(r.id. rocket);
     ivrocket.setimageresource(r.drawable. rocket );
     animationdrawable drawable = (animationdrawable) ivrocket.getdrawable();
     drawable.start();
      mwm.addview( view, params);

      // 设置view的触摸事件，让它可以被拖拽
      view.setontouchlistener( new ontouchlistener() {

        @override
        public boolean ontouch(view v, motionevent event) {
          switch (event.getaction()) {
          case motionevent. action_down:
             startx = ( int ) event.getrawx();
             starty = ( int ) event.getrawy();
             break ;
          case motionevent. action_move:
             int dx = (int ) (event.getrawx() - startx );
             int dy = (int ) (event.getrawy() - starty );
             // 更新浮窗位置
             params. x += dx;
             params. y += dy;

             // 限制窗口坐标不超过屏幕
             if (params .x < 0) {
               params. x = 0;
            }

             if (params .x > winwidth - view .getwidth()) {
               params. x = winwidth - view .getwidth();
            }

             if (params .y < 0) {
               params. y = 0;
            }

             if (params .y > winheight - view .getheight()) {
               params. y = winheight - view .getheight();
            }

             mwm.updateviewlayout( view, params );
             startx = ( int ) event.getrawx();
             starty = ( int ) event.getrawy();
             break ;
          case motionevent. action_up:
             // 手指抬起起，需要发射火箭，限定发射火箭的范围
             if (params .x > 0 && params. x < winwidth
                 && params. y > winheight - 500) {
               sendrocket();
            }
             break ;
          }

          return true ;// 不再把事件传递给onclick处理
       }

     });
   }

   private handler mhandler = new handler() {
      @override
      public void handlemessage(message msg) {
          int y = msg.arg1 ;
          params. y = y;
          mwm.updateviewlayout( view, params);
     }
   };
   private int winwidth ;
   private int winheight ;

   // 发射火箭
   private void sendrocket() {
      // 用子线程更新y轴
      new thread(new runnable() {

        @override
        public void run() {
          int pos = 1000;
          for (int i=0; i <= 10; i++) {
               int y = pos-100*i;
               //休眠100ms发消息
               try {
                 thread. sleep(100);
               } catch (interruptedexception e) {
                  // todo auto-generated catch block
                 e.printstacktrace();
               }

               message msg = message.obtain();
               msg. arg1 = y;
               mhandler.sendmessage(msg);
          }
       }
     }).start();
   }

   @override
   public void ondestroy() {
      // todo auto-generated method stub
      super .ondestroy();
      if (mwm != null && view != null) {
        mwm.removeview( view);
        view = null ;
     }

   }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。