Android开启闪光灯的方法 Android打开手电筒功能

 public class FlashUtils { private static FlashUtils utils; private static Camera camera; public static boolean mIsOpen = true; //使用单例模式在这里初始化相机 public static FlashUtils getInstance() { if (utils == null) { utils = new FlashUtils(); } try { if (camera == null) { camera = Camera.open(); } } catch (Exception e) { if (camera != null) { camera.release(); } camera = null; } return utils; } //参考二维码工具的闪光灯 public void switchFlash() { try { Parameters parameters = camera.getParameters(); if (mIsOpen) { if (parameters.getFlashMode().equals("torch")) { return; } else { parameters.setFlashMode("torch"); } } else { if (parameters.getFlashMode().equals("off")) { return; } else { parameters.setFlashMode("off"); } } camera.setParameters(parameters); } catch (Exception e) { finishFlashUtils(); } mIsOpen = !mIsOpen; } //页面销毁的时候调用此方法 public void finishFlashUtils() { if (camera != null) { camera.stopPreview(); camera.release(); } camera = null; } }