Android抛物线下载动画制作过程

下载动画经常出现在下载需求多的app中，比如游戏下载平台，应用市场……

先看看效果图：

实现

private void startanim() {  
  //以bitmap创建new imageview
  iv.setdrawingcacheenabled(true); 
  bitmap bitmap = iv.getdrawingcache();  
  imageview logo = new imageview(this);   
  logo.setscaletype(imageview.scaletype.fit_xy);   
  logo.setimagebitmap(bitmap); 
  int[] startlocation = new int[2];  
  iv.getlocationinwindow(startlocation);   
  end.getlocationinwindow(location_download); 
  setanim(logo, startlocation, location_download);
}

设置动画

private void setanim(final imageview logo, int[] startlocation,int[] location_download) {  
 viewgroup animmasklayout = createanimlayout();  
 animmasklayout.addview(logo);// 把动画小球添加到动画层 
 // 计算位移
 final view view = addviewtoanimlayout(logo, startlocation);
 // 动画位移的x坐标   
 int endy = location_download[1] - startlocation[1];
 // 动画位移的y坐标  
 translateanimation translateanimationx = new translateanimation(0,  endx, 0, 0);  
 translateanimationx.setinterpolator(new linearinterpolator());   
 translateanimationx.setrepeatcount(0);// 动画重复执行的次数  
 translateanimationx.setfillafter(true);  translateanimation 
 translateanimationy = new translateanimation(0, 0, 0, endy);   
 translateanimationy.setinterpolator(new accelerateinterpolator());  
 translateanimationy.setrepeatcount(0);// 动画重复执行的次数  
 translateanimationx.setfillafter(true);  animationset set = new 
 animationset(false); 
 set.setfillafter(false);  
 set.addanimation(translateanimationy);  
 set.addanimation(translateanimationx); 
 set.setduration(2000);// 动画的执行时间  
 view.startanimation(set);  // 动画监听事件  
 set.setanimationlistener(new animation.animationlistener() {  
    // 动画的开始    
    @override  
    public void onanimationstart(animation animation) {  
       logo.setvisibility(view.visible);  
   }     
   @override 
   public void onanimationrepeat(animation animation) {  
   }   
   // 动画的结束    
   @override  
   public void onanimationend(animation animation) {      
       logo.setvisibility(view.gone);  
   } 
  });
}

创建动画父布局

private viewgroup createanimlayout() {
  viewgroup rootview = (viewgroup) getwindow().getdecorview();    
  linearlayout animlayout = new linearlayout(this);    
  linearlayout.layoutparams lp = new linearlayout.layoutparams(
    linearlayout.layoutparams.match_parent, linearlayout.layoutparams.match_parent);  
  animlayout.setlayoutparams(lp);   
  animlayout.setid(integer.max_value);  
  animlayout.setbackgroundresource(android.r.color.transparent);   
  rootview.addview(animlayout); 
  return animlayout;
}

设置动画布局参数

private static view addviewtoanimlayout(final view view, int[] location) { 
 int x = location[0]; 
 int y = location[1]; 
 linearlayout.layoutparams lp = new linearlayout.layoutparams(80, 80); 
 lp.leftmargin = x; 
 lp.topmargin = y; 
 view.setlayoutparams(lp); 
 return view;
}

代码就到此结束了，看起来并不难，动手试试吧。

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。