android dialog加载中动画效果

//显示动画

dialog = new Dialog(context, R.style.loading);
        dialog.setContentView(R.layout.loadinglayout);//此处布局为一个progressbar
        dialog.setCancelable(true); // 可以取消
        dialog.show();
        WindowManager.LayoutParams params = dialog.getWindow().getAttributes();
        params.height = -1;
        params.width = -1;
        params.format=1;
        params.flags = LayoutParams.FLAG_FULLSCREEN | LayoutParams.FLAG_LAYOUT_IN_SCREEN;
        dialog.getWindow().setAttributes(params);

dialog.cancel(); //去掉dialog

 //dialog中设置的布局progressbar

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
   >

    <ProgressBar
        android:id="@+id/loadingbar"
        style="@style/loadingStyle"
        android:layout_width="fill_parent"
        android:layout_height="130dp"
        android:layout_gravity="center">
    </ProgressBar>

</LinearLayout>

//dialog和progressbar分别用的style

<!-- 使用frame动画制作的logo炫动效果 -->
   <style name="loadingStyle">
       <item name="android:indeterminateDrawable">@anim/loading</item>
   </style>

   <style name="loading">
       <item name="android:layout_width">fill_parent</item>
       <item name="android:layout_height">fill_parent</item>
       <item name="android:windowFullscreen">true</item>
       <item name="android:windowNoTitle">true</item>
       <item name="android:backgroundDimEnabled">false</item> <!-- 模糊 -->
       <item name="android:windowIsFloating">true</item><!-- 类似windows的弹出Dialog -->
       <item name="android:windowContentOverlay">@null</item><!-- 不要头部阴影 -->
         <item name="android:windowBackground">@color/transparent</item>   <!-- 背景颜色设置透明-->
   </style>

progressbar中Style引用的动画

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

    <item android:duration="150" android:drawable="@drawable/load1" />
    <item android:duration="150" android:drawable="@drawable/load2" />
    <item android:duration="150" android:drawable="@drawable/load3" />
    <item android:duration="150" android:drawable="@drawable/load4" />
    <item android:duration="150" android:drawable="@drawable/load5" />
    <item android:duration="150" android:drawable="@drawable/load6" />

</animation-list>