Android 7.0 手电筒控制实现

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();

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();
}