繪圖圈逐漸在android系統

Question

我要顯示一個圓圈被吸入的Android逐漸像這樣：

我應該如何開始呢？ 需要做什麼？

Answer 1

ProgressBar p 
p=(PregressBar)findViewById(R.id.p); 
ObjectAnimator animation = ObjectAnimator.ofInt (p, "progress", 0, 100); 
    animation.setDuration (3000); 
    animation.setInterpolator (new DecelerateInterpolator()); 
    animation.start();` 

如果是XML

<ProgressBar 
android:id="@+id/p" 
style="?android:attr/progressBarStyleHorizontal" 
android:layout_width="@dimen/progreess_circle" 
android:layout_height="@dimen/progreess_circle" 
android:layout_gravity="center" 
android:rotation="270" 
android:progress="0" 
android:drawingCacheQuality="low" 
android:progressDrawable="@drawable/circular" /> 

Circular.xml

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
android:innerRadiusRatio="2.3" 
android:shape="ring" 
android:thickness="10sp" > 
<solid android:color="@color/yellow_text_color" />