解决UVCCamera项目报错:could not open camera:err=-1

在使用UVCCamera时，打开外部摄像头时崩溃并抛出异常:could not open camera:err=-1

E AndroidRuntime: FATAL EXCEPTION: BaseActivity
E AndroidRuntime: Process: com.serenegiant.usbcameratest, PID: 8236
E AndroidRuntime: java.lang.UnsupportedOperationException: open failed:result=-1
E AndroidRuntime: 	at com.serenegiant.usb.UVCCamera.open(UVCCamera.java:205)
E AndroidRuntime: 	at com.serenegiant.usbcameratest.MainActivity$2$1.run(MainActivity.java:153)
E AndroidRuntime: 	at android.os.Handler.handleCallback(Handler.java:790)
E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:99)
E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:164)
E AndroidRuntime: 	at android.os.HandlerThread.run(HandlerThread.java:65)
W ActivityManager:   Force finishing activity com.serenegiant.usbcameratest/.MainActivity

解决方案

1. 修改NDK版本
   NDK版本改为14
2. 将编译器改为GCC
   取消libuvccamera / src / main / jni / Application.mk 文件中的注解NDK_TOOLCHAIN_VERSION := 4.9