解决闪光灯代码在Nexus5上面打不开的问题
参考:http://blog.csdn.net/cy524563/article/details/41545387
关键在于:
int textureId = 0;
whyCamera.setPreviewTexture(new SurfaceTexture(textureId));//关键代码:解决在Nexus5上面打不开闪光灯的问题
之前在网上找到的关键代码均不含有以上两行代码,所以导致在Nexus5手机上面打不开闪光灯。
详细代码如下:自定义了一个类,用于执行闪关灯的打开、关闭、销毁等功能。
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
package com.why.flashlight50.model; import android.app.Activity; import android.content.Context; import android.content.pm.FeatureInfo; import android.content.pm.PackageManager; import android.graphics.SurfaceTexture; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.Parameters; import android.util.Log; import android.widget.Toast; public class LedCamera { private static final String TAG = "LedCamera"; private static Camera whyCamera = null; private static Parameters whyparameters = null; private static Activity activityObj;//activity对象,由activity界面中传入:比如MainActivity,用于获取view //给whyCamera变量赋值 public static void prepareCameraLed(Activity activity){ activityObj = activity; if (!isSupportFlashlightSimple(activityObj)) { Toast.makeText(activity, "当前设备没有闪光灯", Toast.LENGTH_LONG).show(); return; }else{ if(whyCamera == null){ try{ whyCamera = Camera.open(); Log.v("ObjectCode", "LedCamera:whyCamera="+whyCamera.hashCode()); Log.v("ObjectCode", "LedCamera:activityObj="+activityObj.hashCode()); return; }catch(Exception localException){ localException.printStackTrace(); } } } } //给whyCamera变量赋值 public static void prepareCameraLed(Context context){ if (!isSupportFlashlightSimple(context)) { Toast.makeText(context, "当前设备没有闪光灯", Toast.LENGTH_LONG).show(); return; }else{ if(whyCamera == null){ try{ whyCamera = Camera.open(); Log.v("ObjectCode", "LedCamera:whyCamera="+whyCamera.hashCode()); Log.v("ObjectCode", "LedCamera:activityObj="+context.hashCode()); return; }catch(Exception localException){ localException.printStackTrace(); } } } } //开启闪光灯 public static void openCameraLed(){ if(whyCamera != null){ try{ int textureId = 0; whyCamera.setPreviewTexture(new SurfaceTexture(textureId));//关键代码:解决在Nexus5上面打不开闪光灯的问题 whyparameters = whyCamera.getParameters(); Log.v(TAG,"openCameraLed=="+whyparameters.getFlashMode()); if ((whyparameters != null) && (whyparameters.getFlashMode() != null)) { whyparameters.setFlashMode("torch");//修改为字符串 whyCamera.setParameters(whyparameters); } Log.v(TAG,"openCameraLed=="+whyparameters.getFlashMode()); //打开预览 whyCamera.startPreview(); return; }catch(Exception localException){ localException.printStackTrace(); } } } //关闭闪光灯 public static void closeCameraLed(){ if(whyCamera != null){ try{ whyparameters = whyCamera.getParameters(); Log.v(TAG,"closeCameraLed=="+whyparameters.getFlashMode()); if ((whyparameters != null) && (whyparameters.getFlashMode() != null)) { whyparameters.setFlashMode("off");//修改为字符串 whyCamera.setParameters(whyparameters); } Log.v(TAG,"closeCameraLed=="+whyparameters.getFlashMode()); //关闭预览 whyCamera.stopPreview(); return; }catch(Exception localException){ localException.printStackTrace(); } } } //释放camera资源 public static void releaseCameraLed() { if (whyCamera != null){ try { whyCamera.release(); whyCamera = null; return; } catch (Exception localException) { localException.printStackTrace(); } } } /** * 判断手机是否支持闪光灯 * @param context * @return */ public static boolean isSupportFlashlight(Context context) { PackageManager packageManager = context.getPackageManager(); FeatureInfo[] features = packageManager.getSystemAvailableFeatures(); for(FeatureInfo f : features) { if(PackageManager.FEATURE_CAMERA_FLASH.equals(f.name)) return true; } return false; } /** * 判断手机是否支持闪光灯--简单版 * @param context * @return */ public static boolean isSupportFlashlightSimple(Context context) { PackageManager packageManager = context.getPackageManager(); if(packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)){ return true; } return false; } }