当我称之为 mCamera = Camera.open（）返回空值，这可能是造成这？我的设备是的Nexus 7。

我已经有中设置的权限我的的Andr​​oidManifest.xml ：

 ＆LT;使用-权限的Andr​​oid：名称=android.permission.CAMERA/＆GT;
 

解决方案

想通了，

您需要调用 Camera.open（0）。

这是唯一有效的和工作的NEXUS 7的设备，因为它只有一个摄像头，所以如果只针对该设备才有用。

When I call mCamera = Camera.open() it returns null, what could be causing this? My device is the Nexus 7.

I already have the permissions set in my AndroidManifest.xml:

<uses-permission android:name="android.permission.CAMERA" />

Figured it out,

You need to call Camera.open(0).

THIS IS ONLY VALID AND WORKING ON THE NEXUS 7 device, as it only has one camera, so is only useful if targeting that device only.