background引起错误：Error inflating class

具体错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.serenegiant.usbcameratest/com.serenegiant.usbcameratest.MainActivity}: 
    android.view.InflateException: Binary XML file line #32 in com.serenegiant.usbcameratest:layout/activity_main: 
    Binary XML file line #32 in com.serenegiant.usbcameratest:layout/activity_main: 
    Error inflating class com.serenegiant.widget.SimpleUVCCameraTextureView

解决办法：

一般是因为缺少构造函数。吾看了代码，是有这个函数的。于是再看：

Caused by: java.lang.UnsupportedOperationException: TextureView doesn't support displaying a background drawable
2021-12-01 19:35:02.992 11716-11716/? E/AndroidRuntime:     at android.view.TextureView.setBackgroundDrawable(TextureView.java:328)

原来是background这个属性已经不支持了，去掉就正常了。