好像没有刷新页面所致,你贴下logcat看看
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03-07 01:19:18.253: W/dalvikvm(298): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
03-07 01:19:18.283: E/AndroidRuntime(298): FATAL EXCEPTION: main
03-07 01:19:18.283: E/AndroidRuntime(298): java.lang.NullPointerException
03-07 01:19:18.283: E/AndroidRuntime(298): at com.yuneach.cyclopedia.MainActivity.onKeyDown(MainActivity.java:201)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.view.KeyEvent.dispatch(KeyEvent.java:1037)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.app.Activity.dispatchKeyEvent(Activity.java:2068)
03-07 01:19:18.283: E/AndroidRuntime(298): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.view.ViewRoot.handleMessage(ViewRoot.java:1735)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.os.Handler.dispatchMessage(Handler.java:99)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.os.Looper.loop(Looper.java:123)
03-07 01:19:18.283: E/AndroidRuntime(298): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-07 01:19:18.283: E/AndroidRuntime(298): at java.lang.reflect.Method.invokeNative(Native Method)
03-07 01:19:18.283: E/AndroidRuntime(298): at java.lang.reflect.Method.invoke(Method.java:521)
03-07 01:19:18.283: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-07 01:19:18.283: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-07 01:19:18.283: E/AndroidRuntime(298): at dalvik.system.NativeStart.main(Native Method)
03-07 01:19:24.303: I/Process(298): Sending signal. PID: 298 SIG: 9