添加開始活動時意外停止（意圖）

我的啓動活動擴展了ListActivity，並使用底部有列表視圖和按鈕的佈局。當我嘗試將onclicklistener設置爲按鈕時，該應用程序現在在啓動時崩潰。這是我的日誌：添加開始活動時意外停止（意圖）

04-18 13:03:09.667: ERROR/AndroidRuntime(4388): FATAL EXCEPTION: main 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.me/com.me.CheckListDemoActivity}: java.lang.ClassCastException: android.widget.ImageButton 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.os.Looper.loop(Looper.java:123) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at java.lang.reflect.Method.invoke(Method.java:521) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at dalvik.system.NativeStart.main(Native Method) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388): Caused by: java.lang.ClassCastException: android.widget.ImageButton 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at com.me.CheckListDemoActivity.onCreate(CheckListDemoActivity.java:31) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
04-18 13:03:09.667: ERROR/AndroidRuntime(4388):  ... 11 more 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436): FATAL EXCEPTION: main 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.me.CheckListDemoActivity}: java.lang.ClassCastException: android.widget.ImageButton 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.os.Looper.loop(Looper.java:123) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at java.lang.reflect.Method.invoke(Method.java:521) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at dalvik.system.NativeStart.main(Native Method) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436): Caused by: java.lang.ClassCastException: android.widget.ImageButton 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at com.me.CheckListDemoActivity.onCreate(CheckListDemoActivity.java:30) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  ... 11 more

來源

2011-04-18 LuxuryMode

您試圖在CheckListDemoActivity的第30行上投射某個ImageButton，它可能是一個按鈕（反之亦然）。

來源

2011-04-18 17:16:39 Abhinav

賓果！接得好。我在我的活動中使用了Button，來抓住它，而不是ImageButton。 – LuxuryMode 2011-04-18 17:22:24

標記答案已解決，我們可以稱它爲一天。 ;） – Abhinav 2011-04-18 18:38:13

的問題是在這裏：

04-18 13:05:42.589: ERROR/AndroidRuntime(4436): Caused by: java.lang.ClassCastException: android.widget.ImageButton 
04-18 13:05:42.589: ERROR/AndroidRuntime(4436):  at com.me.CheckListDemoActivity.onCreate(CheckListDemoActivity.java:30)

什麼是com.me.CheckListDemoActivity線30？

來源

2011-04-18 17:14:46 adamp

添加開始活動時意外停止（意圖）

回答

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