Android 调用闪光灯

1.打开闪光灯

try {
                Log.i("tag", "~~~~~~~~~~~打开闪光灯~~~~~~~~~~~");
                camera = Camera.open();
                camera.startPreview();
                Parameters parameters = camera.getParameters();
                parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
                camera.setParameters(parameters);
            } catch (Exception e) {
                e.printStackTrace();
            }

2.关闭闪光灯

try {
                Log.i("tag", "~~~~~~~~~~~关闭闪光灯~~~~~~~~~~~");
                Parameters parameters = camera.getParameters();
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                camera.setParameters(parameters);
                camera.release();
                camera = null;
            } catch (Exception e) {
                e.printStackTrace();
            }

小米3手机上调用此方法没有作用。