我想只打开相机闪光灯（不带摄像头preVIEW）编程的机器人。我用Google搜索，但帮助我发现叫我去此页

I want to turn on only the camera flash light (not with camera preview) programmatically in Android. I googled for it but the help i found referred me to this page

有没有人有任何联系或来样code？

Does anyone have any links or sample code?

推荐答案

对于这个你应该做这样的：

For this you should do like :

检查闪光灯是否 可用？

Check whether flash light is available or not ?

如果是的话那么关闭/开启

If yes then Turn Off/On

如果没有，那么你可以任何根据您的应用程序做的。 需要

If no then you can do whatever according to your app. needs

对于检查闪光可用性在设备：

您可以使用以下

 context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

这将返回true，如果闪存可用，否则为false。

which will return true if a flash is available, false if not.

请参阅http://developer.android.com/reference/android/content/pm/PackageManager.html了解更多信息。

对于开/关手电筒打开：

我GOOGLE了出去，上了这一下android.permission.FLASHLIGHT。 Android的舱单的许可看起来很有希望：

I googled out and got this about android.permission.FLASHLIGHT. Android manifests' permission looks promising:

 <!-- Allows access to the flashlight -->
 <permission android:name="android.permission.FLASHLIGHT"
             android:permissionGroup="android.permission-group.HARDWARE_CONTROLS"
             android:protectionLevel="normal"
             android:label="@string/permlab_flashlight"
             android:description="@string/permdesc_flashlight" />

然后利用相机并设置Camera.Parameters.此处所使用的主要参数是FLASH_MODE_TORCH.

Then make use of Camera and set Camera.Parameters. The main parameter used here is FLASH_MODE_TORCH.

如：

code片段，打开相机闪光灯。

Code Snippet to turn on camera flash light.

Camera cam = Camera.open();     
Parameters p = cam.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
cam.setParameters(p);
cam.startPreview();

code段关闭摄像头LED灯。

Code snippet to turn off camera led light.

  cam.stopPreview();
  cam.release();

我刚刚发现，使用该权限的项目。检查快速设置SRC code。在这里 HTTP：//$c$c.google.com/p/quick-settings/ （注：此链接现在是打破）

I just found a project that uses this permission. Check quick-settings' src code. here http://code.google.com/p/quick-settings/ (Note: This link is now broken)

有关手电筒直接看http://$c$c.google.com/p/quick-settings/source/browse/trunk/quick-settings/#quick-settings/src/com/bwx/bequick/flashlight （注：此链接现在是打破）

For Flashlight directly look http://code.google.com/p/quick-settings/source/browse/trunk/quick-settings/#quick-settings/src/com/bwx/bequick/flashlight (Note: This link is now broken)

Update6 你也可以尝试添加一个SurfaceView作为这个答案LED手电筒Galaxy Nexus的控制由什么API？ 这似乎是解决方案，许多手机上的作品。

Update6 You could also try to add a SurfaceView as described in this answer LED flashlight on Galaxy Nexus controllable by what API? This seems to be solution that works on many phones.

更新5 主要更新

我已经找到替代的链接（上述损坏的链接）：http://www.java2s.com/Open-Source/Android/Tools/quick-settings/com.bwx.bequick.flashlight.htm现在，您可以使用这个链接。 [更新：14/9/2012此链接现在是打破]

I have found alternate Link(for above broken links): http://www.java2s.com/Open-Source/Android/Tools/quick-settings/com.bwx.bequick.flashlight.htm You can now use this link. [Update : 14/9/2012 This link is now broken]

更新1

另一种开放源代码code： http://$c$c.google.com/p/torch/source/browse/

Another OpenSource Code : http://code.google.com/p/torch/source/browse/

更新2

示例，演示如何使LED在摩托罗拉Droid： HTTP：//$c$c.google。 COM / P / droidled /

Example showing how to enable the LED on a Motorola Droid : http://code.google.com/p/droidled/

另一个开源$ C ​​$ C：

Another Open Source Code :

HTTP：//$c$c.google.com/p/covedesigndev/    HTTP：//$c$c.google.com/p/search-light/

http://code.google.com/p/covedesigndev/ http://code.google.com/p/search-light/

更新3（对于小部件开启/关闭摄像头LED）

如果你想开发一个小部件，打开/关闭你的摄像头LED，那么你必须参考我的回答Widget为开/关摄像头手电筒安卓打开。

If you want to develop a widget that turns on/off your camera led, then you must refer my answer Widget for turning on/off camera flashlight in android..

更新4

如果你想设置光摆脱摄像头的强度LED可以参考Can更改Android设备的LED亮度？满后..请注意，只有扎根HTC设备支持此功能。

If you want to set intensity of light emerging from camera LED you can refer Can I change the LED intensity of an Android device? full post.. Note that only rooted HTC devices support this feature.

的问题：

也有一些问题，同时打开/关闭手电筒。例如。对于设备没有 FLASH_MODE_TORCH 或者即使有，那么手电筒多年平均值开启等。

There are also some problems while turning On/Off flashlight. eg. for the devices not having FLASH_MODE_TORCH or even if it has, then flashlight doesnot turn ON etc.

通常情况下三星产生了很多问题。

Typically Samsung creates alot of problems.

您可以参考有关问题的文章给出：

You can refer about problems in the given below list:

使用相机闪光灯在Android的

Turn在三星Galaxy王牌2.2.1与放大器的开/关摄像头LED /闪光灯; Galaxy Tab的