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Progressbar 實(shí)現(xiàn)Loading動(dòng)畫

網(wǎng)絡(luò)加載，播放視頻 loading 時(shí)候界面會(huì)顯示 轉(zhuǎn)圈 等待提示動(dòng)畫，使用Android 自帶的Progressbar 即可實(shí)現(xiàn)，在使用的時(shí)候控制其Visible 屬性；

布局layout目錄文件中添加Progressbar

<ProgressBar
            android:id="@+id/help_center_loading_prgbar"
            style="@style/CustomProgressBar_Small"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:visibility="visible"/>

Value/style.xml中添加：

<style name="CustomProgressBar_Small">
        <item name="android:indeterminateDrawable">@drawable/progress_small_holo</item>
        <item name="android:minWidth">27dip</item>
        <item name="android:maxWidth">27dip</item>
        <item name="android:minHeight">27dip</item>
        <item name="android:maxHeight">27dip</item>
    </style>

drawable 目錄添加progress_small_holo.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<!--
 Copyright 2010, The Android Open Source Project

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
             android:drawable="@drawable/loading_small"
             android:pivotX="50%"
             android:pivotY="50%"
             android:fromDegrees="0"
             android:toDegrees="720" />
    </item>
</layer-list>