推荐回答（3个）
可以统一调整Activity或者application的style，在manifest中设置对应的android:theme="@android:style/Theme.Holo"。
对于任意widget，都可以设置其background，xml中指定android:background=""对应的图片就可以啦
把你style里面的AppTheme样式修改为下面的样式
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