[英]Android/Java: detect if device has a BACK Camera
How do I detect if the device has a camera on the BACK? 如何检测设备背面是否有摄像头?
This is my code to detect if the device has a Flashlight: 这是我检测设备是否有手电筒的代码:
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)
|| (_camera.getParameters().getSupportedFlashModes() != null)) hasFlashlight = true;
else hasFlashlight = false;
But it is TRUE even if the device only has a Front Camera without the flashlight. 但即使设备只有没有手电筒的前置摄像头,它也是正确的。
For API >= 9 : you can use Camera.getCameraInfo with something like this : 对于API> = 9:您可以使用Camera.getCameraInfo ,如下所示:
int backCameraId = -1;
for(int i=0;i<Camera.getNumberOfCameras();i++){
CameraInfo cameraInfo = new CameraInfo();
Camera.getCameraInfo(i,cameraInfo);
if(cameraInfo.facing==CameraInfo.CAMERA_FACING_BACK) {
backCameraId = i;
break;
}
}
Log.d(TAG, "back camera exists ? "+(backCameraId>-1));
Log.d(TAG, "back camera id :"+backCameraId);
For API >= 21, you are advised to use the Camera2 API : 对于API> = 21,建议您使用Camera2 API:
String backCameraId = null;
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
for(String cameraId:manager.getCameraIdList()){
CameraCharacteristics cameraCharacteristics = manager.getCameraCharacteristics(cameraId);
Integer facing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING);
if(facing==CameraMetadata.LENS_FACING_BACK) {
backCameraId = cameraId;
break;
}
}
Log.d(TAG, "back camera exists ? "+(backCameraId!=null));
Log.d(TAG, "back camera id :"+backCameraId);
Try check the number of Cameras: 尝试检查相机的数量:
import android.hardware.Camera;
int numberOfCameras = Camera.getNumberOfCameras();
If it is greater than 1, pretty sure got a rear camera. 如果它大于1,相当肯定有后置摄像头。
public boolean isRearCameraAvailable(Context context) {
return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA);
}
Checks if the device has a camera facing away from the device user 检查设备是否有远离设备用户的摄像头
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