请帮看看下面的代码,想实现按回退按钮,浏览器返回上一页,但实现结果是程序崩溃了? 好像没有刷新页面所致,你贴下logcat看看 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 03-07 01:19:18.253: D/AndroidRuntime(298): Shutting down VM03-07 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: main03-07 01:19:18.283: E/AndroidRuntime(298): java.lang.NullPointerException03-07 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 空指针了,onKeyDown中mWebView 你这玩意使用的是全局变量。你初始化过的是局部变量,你干嘛定义2个webview? 关于tabhost的宽度问题~~~~急!!! 关于Absolutelayout 状态栏抖动问题,急急急!!!!!!! android 登录个人邮箱 android2.3 HDMI android tabhost的问题 曾有JAVA基础.现自学Android开发.可以吗? 如何实现和IPhone类似的特效 百度地图覆盖物傻瓜教程 android opengl 问题 android NullPointerException闪退 Android 动画移动控件后,控件失去焦点,求求帮助!
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