Crash problem

java.lang.RuntimeException: Camera is being used after Camera.release() was called

preview callback Time problem , Refer to the following ：

mCamera.setPreviewCallback(null) ;
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();

stay stopPreview and release Before calling setPreviewCallback(null)  That's it

At the end of the call closecamera, To give setPreviewCallback Clear it out

You can refer to ：

https://blog.csdn.net/pbm863521/article/details/75111379