requestWindowFeature 调用时机不对，在创建自定义的Dialog时，设置自定义view，在onCreate里的正确调用顺序
requestWindowFeature->super.onCreate(savedInstanceState)->获取当前Window对象（Window window = getWindow()）->setContentView()->设置Window参数（WindowManager.LayoutParam）window.setAttributes()
requestWindowFeature 调用时机不对，在创建自定义的Dialog时，设置自定义view，在onCreate里的正确调用顺序
requestWindowFeature->super.onCreate(savedInstanceState)->获取当前Window对象（Window window = getWindow()）->setContentView()->设置Window参数（WindowManager.LayoutParam）window.setAttributes()
本文标题：requestFeature() must be called
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