缓冲进度条或加载进度条，在加载页面或者视频加载过程中，为了做到更好的UI及App功能体验交互，这些缓冲加载的等待效果是必不可少的；

下面来看一下旋转的动画效果：那么，他们的具体源码在这里：loading_1:

<?xml version="1.0" encoding="utf-8"?>
<rotate 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="1080.0" >

    <shape
        android:innerRadiusRatio="3"
        android:shape="ring"
        android:thicknessRatio="8"
        android:useLevel="false" >
        <gradient
            android:centerColor="#FFDC35"
            android:centerY="0.50"
            android:endColor="#CE0000"
            android:startColor="#FFFFFF"
            android:type="sweep"
            android:useLevel="false" />
    </shape>

</rotate>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item >
        <rotate
            android:drawable="@drawable/movie_loading"
            android:fromDegrees="0.0"
            android:pivotX="50.0%"
            android:pivotY="50.0%"
            android:toDegrees="1080.0" />
    </item>

</layer-list>

<?xml version="1.0" encoding="UTF-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:oneshot="false" >

    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_01"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_02"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_03"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_04"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_05"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_06"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_07"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_08"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_09"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_10"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_11"
            android:gravity="left" />
    </item>
    <item android:duration="150">
        <clip
            android:clipOrientation="horizontal"
            android:drawable="@drawable/loading_12"
            android:gravity="left" />
    </item>

</animation-list>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:gravity="center_horizontal"
    android:background="#222222">

    <ProgressBar
        android:id="@+id/loading_1"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginTop="60dp"
        android:indeterminate="false"
        android:padding="5dp"
        android:indeterminateDrawable="@drawable/loading_1" />

    <ProgressBar
        android:id="@+id/loading_2"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginTop="60dp"
        android:indeterminate="false"
        android:padding="5dp"
        android:indeterminateDrawable="@drawable/loading_2" />

    <ProgressBar
        android:id="@+id/loading_3"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:indeterminate="false"
        android:layout_marginTop="60dp"
        android:padding="5dp"
        android:indeterminateDrawable="@drawable/loading_3" />

</LinearLayout>

后待续。。。

缓冲进度条或加载进度条