12.15 PullDoorView中Scroller

心已赠人 2022-08-06 03:08 132阅读 0赞

参考：

http://blog.csdn.net/liuhe688/article/details/6660823

http://blog.csdn.net/manymore13/article/details/12219687

PullDoorView中有一段代码：

1.  // 这个Interpolator你可以设置别的 我这里选择的是有弹跳效果的Interpolator  
2.          Interpolator polator = **new** BounceInterpolator();  
3.          mScroller = **new** Scroller(mContext, polator);

BounceInterpolator是一个插值器，可用于Scroller、view、animation、

public void negative(View v) \{    
        Animation anim = new RotateAnimation(currAngle, currAngle - 180, Animation.RELATIVE\_TO\_SELF, 0.5f,    
                Animation.RELATIVE\_TO\_SELF, 0.5f);    
        /\*\* 匀速插值器 \*/    
        LinearInterpolator lir = new LinearInterpolator();    
        anim.setInterpolator(lir);    
        anim.setDuration(1000);    
        /\*\* 动画完成后不恢复原状 \*/    
        anim.setFillAfter(true);    
        currAngle -= 180;    
        if (currAngle < -360) \{    
            currAngle = currAngle + 360;    
        \}    
        piechart.startAnimation(anim);    
    \}

动画定义文件/res/anim/scale.xml如下：  
\[html\] view plaincopy  
<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android"    
    android:interpolator="@android:anim/bounce\_interpolator">    
    <scale    
        android:fromXScale="1.0"    
        android:toXScale="2.0"    
        android:fromYScale="1.0"    
        android:toYScale="2.0"    
        android:pivotX="0.5"    
        android:pivotY="50%"    
        android:duration="2000"/>    
    <alpha    
        android:fromAlpha="0.0"    
        android:toAlpha="1.0"    
        android:duration="3000"/>    
</set>

动画定义文件/res/anim/rotate.xml如下：  
\[html\] view plaincopy  
<?xml version="1.0" encoding="utf-8"?>    
<set xmlns:android="http://schemas.android.com/apk/res/android"    
    android:interpolator="@android:anim/accelerate\_decelerate\_interpolator">    
    <rotate    
        android:fromDegrees="0"    
        android:toDegrees="+360"    
        android:pivotX="50%"    
        android:pivotY="50%"    
        android:duration="5000"/>    
</set>

下面是几种常见的插值器：

<table style="color:rgb(0,0,0); font-family:Arial; font-size:14px; line-height:26px"> 
 <tbody> 
  <tr> 
   <th>Interpolator对象</th> 
   <th>资源ID</th> 
   <th>功能作用</th> 
  </tr> 
  <tr> 
   <td>AccelerateDecelerateInterpolator</td> 
   <td>@android:anim/accelerate_decelerate_interpolator</td> 
   <td>先加速再减速</td> 
  </tr> 
  <tr> 
   <td>AccelerateInterpolator</td> 
   <td>@android:anim/accelerate_interpolator</td> 
   <td>加速</td> 
  </tr> 
  <tr> 
   <td>AnticipateInterpolator</td> 
   <td>@android:anim/anticipate_interpolator</td> 
   <td>先回退一小步然后加速前进</td> 
  </tr> 
  <tr> 
   <td>AnticipateOvershootInterpolator</td> 
   <td>@android:anim/anticipate_overshoot_interpolator</td> 
   <td>在上一个基础上超出终点一小步再回到终点</td> 
  </tr> 
  <tr> 
   <td>BounceInterpolator</td> 
   <td>@android:anim/bounce_interpolator</td> 
   <td>最后阶段弹球效果</td> 
  </tr> 
  <tr> 
   <td>CycleInterpolator</td> 
   <td>@android:anim/cycle_interpolator</td> 
   <td>周期运动</td> 
  </tr> 
  <tr> 
   <td>DecelerateInterpolator</td> 
   <td>@android:anim/decelerate_interpolator</td> 
   <td>减速</td> 
  </tr> 
  <tr> 
   <td>LinearInterpolator</td> 
   <td>@android:anim/linear_interpolator</td> 
   <td>匀速</td> 
  </tr> 
  <tr> 
   <td>OvershootInterpolator</td> 
   <td>@android:anim/overshoot_interpolator</td> 
   <td>快速到达终点并超出一小步最后回到终点</td> 
  </tr> 
 </tbody> 
</table>

然后我们可以这样使用一个插值器：

**\[html\]**  [view plain][] [copy][view plain]

1.  **<****set** android:interpolator="@android:anim/accelerate\_interpolator"**>**  
2.  ...  
3.  **</****set****>**

**\[html\]**  [view plain][] [copy][view plain]

1.  **<****alpha** android:interpolator="@android:anim/accelerate\_interpolator"  
2.      ...**/>**

[view plain]: http://blog.csdn.net/liuhe688/article/details/6660823#