我是Bootstrap的新手。我想在我的演示项目中加入navbar。 ＆＃34;切换崩溃＆＃34;似乎没有按预期工作。当我点击＆＃34; Home＆＃34;或者说＆＃34;关于＆＃34;，没有任何反应。理想情况下，我本以为它会崩溃（类似于单击“切换导航”按钮时发生的情况）。请提出建议。我已经调查了类似的问题，但无法解决我的问题。
https://jsfiddle.net/shenoyvnm/s9w8vd7z/
12-31 20:00:15.407 3244-5501/? E/Camera2Client﹕ takePicture: Camera 0: Cannot take picture without preview enabled
12-31 20:00:15.408 6988-6988/? W/System.err﹕ java.lang.RuntimeException: takePicture failed
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.hardware.Camera.native_takePicture(Native Method)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.hardware.Camera.takePicture(Camera.java:1434)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at org.fawkes.fawkesrc.FawkesRCActivity$5.run(FawkesRCActivity.java:327)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.Activity.runOnUiThread(Activity.java:5524)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at org.fawkes.fawkesrc.FawkesRCActivity.onResume(FawkesRCActivity.java:298)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1258)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.Activity.performResume(Activity.java:6327)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.ActivityThread.-wrap11(ActivityThread.java)
12-31 20:00:15.408 6988-6988/? W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at android.os.Looper.loop(Looper.java:148)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5417)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
12-31 20:00:15.409 6988-6988/? W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)