欢迎页出现白屏问题 刚启动欢迎页面，出现白屏问题 通过设置主题的背景解决
背景用Drawable实现
1.定义drawable
<selector /> ........StateListDrawable
<level-list /> ........LevelListDrawable
<layer-list /> ........LayerDrawable
<transition /> ........TransitionDrawable
<color /> ........ColorDrawable
<shape /> ........GradientDrawable
<scale /> ........ScaleDrawable
<clip /> ........ClipDrawable
<rotate /> ........RotateDrawable
<animation-list/> .....AnimationDrawable
<inset /> ........InsetDrawable
<bitmap /> ........BitmapDrawable
<nine-patch /> ........NinePatchDrawable
xml：
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<solid android:color="@color/app_background" />
</shape>
</item>
<item android:bottom="48dp">
<bitmap
android:gravity="center"
android:src="@drawable/logo" />
</item>
</layer-list>
2.定义Activity的样式
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style
name="Theme.Default.NoActionBar"
parent="@android:style/Theme.Holo.Light.NoActionBar" >
<item name="android:windowBackground">@drawable/login</item>
</style>
</resources>
3.主题设置到指定的Activity上
<activity
android:name="WelcomeActivity"
android:theme="@style/Theme.Default.NoActionBar"/>