android - Camera2问题

Question

在6.0.1系统做定制相机开发，调用系统API CameraManager.getCameraList()。获取的cameraId数组为空。事实上设备是有一个摄像头的。为什么会拿不到？请教下是什么原因？有没有其他手段避开这个问题顺利完成相机定制？

Answer 1

Without obtaining camera permission, the real phone displays two values ​​0 (Non-removable cameras use integers starting at 0 for their identifiers) and 1 (both front and rear cameras);
Official document What is shown above is CameraManager.getCameraIdList(), not CameraManager.getCameraList(). CameraManager.getCameraIdList()，而不是CameraManager.getCameraList()，
这个 API 是 Android 21 添加的，检查下 targetSdkVersionThis API was added in Android 21. Check whether targetSdkVersion is lower than 21.