如何打开“前置摄像头”在Android平台上?
更一般地说,如果一台设备有多个嵌入式摄像头, 有没有一种方法可以特别初始化其中一个?
我在Android参考文档中没有找到它:
- https://developer.android。 com/reference/android/hardware/Camera.html
- https://developer.android.com/reference/android/hardware/camera2/package-summary.html
- https://developer.android.com/reference/android/hardware/camera2/CameraManager.html
三星 SHW-M100S 有两个摄像头。如果没有提到使用两个摄像头,知道三星是怎么做的......?
More generally, if a device has more than one embedded camera,
is there a way to initialize one of them in particular?
I didn't find it in Android reference documentation:
- https://developer.android.com/reference/android/hardware/Camera.html
- https://developer.android.com/reference/android/hardware/camera2/package-summary.html
- https://developer.android.com/reference/android/hardware/camera2/CameraManager.html
Samsung SHW-M100S has two cameras. If there is no reference to use two cameras, any idea how Samsung did...?
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在
AndroidManifest.xml
文件中添加以下权限:注意: 此功能在 Gingerbread(2.3) 及以上 Android 版本中可用。
Add the following permissions in the
AndroidManifest.xml
file:Note: This feature is available in Gingerbread(2.3) and Up Android Version.
所有旧答案的方法均已被 Google 弃用(据说是因为这样的麻烦),从 API 21 开始,您需要 使用相机 2 API:
在较新的API中,您拥有几乎完整的功能< /strong> 通过Android设备摄像头和文档明确建议
,然后使用获得的CameraId打开摄像头:
99%的前置摄像头id =“1”,后置摄像头id =“0”
根据这个:
但是,这意味着如果设备情况很少见,例如只有 1 个前置摄像头平板电脑,您需要计算您拥有多少个嵌入式摄像头,并按以下顺序放置摄像头的顺序它的重要性(“0”)。因此 CAMERA_FACING_FRONT == 1 CAMERA_FACING_BACK == 0,这意味着后置摄像头比前置摄像头更重要。
我不知道在所有 Android 设备上识别前置摄像头的统一方法。简单地说,由于某些原因,设备内的 Android 操作系统无法真正找出哪个摄像头的确切位置:也许唯一的摄像头硬编码 ID 是一个代表其重要性的整数,或者可能在某些设备上,无论你转向哪一侧都会是......“后退”。
文档:https://developer. android.com/reference/android/hardware/camera2/package-summary.html
显式示例:https://github.com/googlesamples/android-Camera2Basic
对于较旧的 API(不推荐,因为它无法在较新的 Android 手机上运行)版本和传输是一件痛苦的事情)。只需使用相同的整数 CameraID (1) 打开前置摄像头,如此答案:
如果你信任 OpenCV来做摄像头部分:
内部
使用以下内容作为前置摄像头:
All older answers' methods are deprecated by Google (supposedly because of troubles like this), since API 21 you need to use the Camera 2 API:
In the newer API you have almost complete power over the Android device camera and documentation explicitly advice to
and then use obtained CameraId to open the camera:
99% of the frontal cameras have id = "1", and the back camera id = "0"
according to this:
However, this means if device situation is rare like just 1-frontal -camera tablet you need to count how many embedded cameras you have, and place the order of the camera by its importance ("0"). So CAMERA_FACING_FRONT == 1 CAMERA_FACING_BACK == 0, which implies that the back camera is more important than frontal.
I don't know about a uniform method to identify the frontal camera on all Android devices. Simply said, the Android OS inside the device can't really find out which camera is exactly where for some reasons: maybe the only camera hardcoded id is an integer representing its importance or maybe on some devices whichever side you turn will be .. "back".
Documentation: https://developer.android.com/reference/android/hardware/camera2/package-summary.html
Explicit Examples: https://github.com/googlesamples/android-Camera2Basic
For the older API (it is not recommended, because it will not work on modern phones newer Android version and transfer is a pain-in-the-arse). Just use the same Integer CameraID (1) to open frontal camera like in this answer:
If you trust OpenCV to do the camera part:
Inside
use the following for the frontal camera:
从 Android 2.1 开始,Android 在其 SDK 中仅支持单个摄像头。这很可能会在未来的 Android 版本中添加。
As of Android 2.1, Android only supports a single camera in its SDK. It is likely that this will be added in a future Android release.
要打开后置摄像头:-
要打开前置摄像头:-
我无法使其适用于 API 28 及更高版本。此外,在某些设备中无法直接打开前置摄像头(取决于制造商)。
To open the back camera:-
To open the front camera:-
I could not make it work for API 28 and above. Also, opening the front camera directly is not possible in some devices(depends on the manufacturer).
对于 API 21 (5.0) 及更高版本,您可以使用 CameraManager API
For API 21 (5.0) and later you can use the CameraManager API's
随着 Android 2.3 (Gingerbread) 的发布,您现在可以使用
android .hardware.Camera
类获取摄像头数量、有关特定摄像头的信息,并获取对特定Camera
的引用。查看新的Camera
API 这里。With the release of Android 2.3 (Gingerbread), you can now use the
android.hardware.Camera
class to get the number of cameras, information about a specific camera, and get a reference to a specificCamera
. Check out the newCamera
APIs here.build.gradle
设置视图
build.gradle
Set View
/* 这不是正确的方法,这是运行 Android 4.0 或更早版本的旧设备的解决方案。这可用于测试目的,但不建议用于主要开发。该解决方案只能被视为临时解决方案。但这个解决方案已经帮助了很多人,所以我不打算删除这个答案*/
/* This is not the proper way, this is a solution for older devices that run Android 4.0 or older. This can be used for testing purposes, but not recommended for main development. This solution can be considered as a temporary solution only. But this solution has helped many so I don't intend to delete this answer*/
我发现这效果很好。
I found this works nicely.