使用如何在 Android 中以编程方式打开相机闪光灯？，我试着打开手电筒。我用于测试的设备是 Galaxy SIII。以下是我的 java 文件中的代码。
camera = Camera.open();
Parameters p = camera.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();
在清单文件中，已声明以下权限。
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
但是，当我尝试从手机上的应用程序打开手电筒时，应用程序崩溃了。我猜这可能是因为设备本身不支持手电筒。logcat如下
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 17220 ++
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 17220 --
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 1902 ++
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 1902 --
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 2204 ++
05-17 07:52:30.489: E/AudioPolicyService(1902): getOutput() tid 2204 --
05-17 07:52:30.504: E/AudioMixer(1902): MOON > checkSEC_PCM ++ 1
05-17 07:52:30.504: E/AudioMixer(1902): MOON > checkSEC_PCM ++ 1
05-17 07:52:30.504: E/AudioResampler(1902): Unsupported sample format, 1 bits, 1 channels
05-17 07:52:30.619: E/AndroidRuntime(4740): FATAL EXCEPTION: main
05-17 07:52:30.619: E/AndroidRuntime(4740): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.app/com.example.app$Potter}: java.lang.RuntimeException: Fail to connect to camera service
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread.deliverResults(ActivityThread.java:3182)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3225)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread.access$1100(ActivityThread.java:140)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1275)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.os.Handler.dispatchMessage(Handler.java:99)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.os.Looper.loop(Looper.java:137)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread.main(ActivityThread.java:4898)
05-17 07:52:30.619: E/AndroidRuntime(4740): at java.lang.reflect.Method.invokeNative(Native Method)
05-17 07:52:30.619: E/AndroidRuntime(4740): at java.lang.reflect.Method.invoke(Method.java:511)
05-17 07:52:30.619: E/AndroidRuntime(4740): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
05-17 07:52:30.619: E/AndroidRuntime(4740): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
05-17 07:52:30.619: E/AndroidRuntime(4740): at dalvik.system.NativeStart.main(Native Method)
05-17 07:52:30.619: E/AndroidRuntime(4740): Caused by: java.lang.RuntimeException: Fail to connect to camera service
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.hardware.Camera.native_setup(Native Method)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.hardware.Camera.<init>(Camera.java:348)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.hardware.Camera.open(Camera.java:325)
05-17 07:52:30.619: E/AndroidRuntime(4740): at com.example.app.MainActivity$Potter.startActivityWithName(MainActivity.java:100)
05-17 07:52:30.619: E/AndroidRuntime(4740): at com.example.app.MainActivity$Potter.onActivityResult(MainActivity.java:183)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.Activity.dispatchActivityResult(Activity.java:5390)
05-17 07:52:30.619: E/AndroidRuntime(4740): at android.app.ActivityThread.deliverResults(ActivityThread.java:3178)
05-17 07:52:30.619: E/AndroidRuntime(4740): ... 11 more
05-17 07:52:30.664: E/android.os.Debug(2271): !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error
05-17 07:52:38.849: E/MtpService(2094): In MTPAPP onReceive:android.intent.action.BATTERY_CHANGED
05-17 07:52:38.849: E/MtpService(2094): battPlugged Type : 2
05-17 07:52:39.419: E/Launcher(22785): Error finding setting, default accessibility to not found: accessibility_enabled
05-17 07:52:44.159: E/Watchdog(2271): !@Sync 8677
我应该怎么做才能使这项工作或者我如何首先检查设备是否支持闪光灯打开？