在AndroidN(7.0)前你对手电筒的控制也许是这样的:
Camera camera = Camera.open();
if(open){
Parameters mParameters = camera.getParameters();
mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
camera.setParameters(mParameters);
} else {
Parameters mParameters = camera.getParameters();
mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
camera.setParameters(mParameters);
}
camera.release();
但在Android N(7.0)及以后,也许你就发现不灵了,那你就需要这样做了:
在Android(M)6.0 后,Android引入了新的API,对闪光灯的控制通过CameraManager处理;首先简单的对两个类进行说明:
(1)CameraManager.java:
可通过CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);获得,通过此类与相机设备进行通信。
(2)CameraCharacteristics.java:
给定指定的相机设备ID,通过此类查询相关硬件信息。
手电筒操作
try {
//获取CameraManager
CameraManager mCameraManager = (CameraManager) MyApplication.getContext().getSystemService(Context.CAMERA_SERVICE);
//获取当前手机所有摄像头设备ID
String[] ids = mCameraManager.getCameraIdList();
for (String id : ids) {
CameraCharacteristics c = mCameraManager.getCameraCharacteristics(id);
//查询该摄像头组件是否包含闪光灯
Boolean flashAvailable = c.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
/*
* 获取相机面对的方向
* CameraCharacteristics.LENS_FACING_FRONT 前置摄像头
* CameraCharacteristics.LENS_FACING_BACK 后只摄像头
* CameraCharacteristics.LENS_FACING_EXTERNAL 外部的摄像头
*/
Integer lensFacing = c.get(CameraCharacteristics.LENS_FACING);
if (flashAvailable != null && flashAvailable
&& lensFacing != null && lensFacing == CameraCharacteristics.LENS_FACING_BACK) {
//打开或关闭手电筒
mCameraManager.setTorchMode(id, OPEN? true:false);
}
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
以上就是本文的全部内容,希望对大家的学习有所帮助。