Question

I m试图利用以下手段创建Spinner。但我收到<条码>NullPointerException。

        Register.registerlist.setAdapter(spinnernamelist);

谁能帮助我? 谢谢。

ArrayAdapter<String> spinnernamelist= new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, Register.namelist);
    spinnernamelist.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    Register.registerlist=(Spinner)findViewById(R.id.showlist);
    Register.registerlist.setAdapter(spinnernamelist);

Mylogcat输出 -

11-22 07:43:30.881: E/AndroidRuntime(1200): java.lang.IllegalStateException: Could not execute method of the activity
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.view.View$1.onClick(View.java:3019)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.view.View.performClick(View.java:3460)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.view.View$PerformClick.run(View.java:13955)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.os.Handler.handleCallback(Handler.java:605)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.os.Looper.loop(Looper.java:137)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.app.ActivityThread.main(ActivityThread.java:4340)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at java.lang.reflect.Method.invokeNative(Native Method)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at java.lang.reflect.Method.invoke(Method.java:511)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at dalvik.system.NativeStart.main(Native Method)
11-22 07:43:30.881: E/AndroidRuntime(1200): Caused by: java.lang.reflect.InvocationTargetException
11-22 07:43:30.881: E/AndroidRuntime(1200):     at java.lang.reflect.Method.invokeNative(Native Method)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at java.lang.reflect.Method.invoke(Method.java:511)
11-22 07:43:30.881: E/AndroidRuntime(1200):     at android.view.View$1.onClick(View.java:3014)
11-22 07:43:30.881: E/AndroidRuntime(1200):     ... 11 more
11-22 07:43:30.881: E/AndroidRuntime(1200): Caused by: java.lang.NullPointerException
11-22 07:43:30.881: E/AndroidRuntime(1200):     at Picture.Capture.Register.callPictureTake(Register.java:56)

Answer 1

明显无效,因此,<代码>Registerlist必须取消。 findViewById(......),如果在活动母体内看不到该识别符号,则该编号无效。确保你推荐的身份证确实是你要求它参加的活动。

Answer 2

很可能,<代码>Registerlist是无效的,在你试图对其实施某种方法时,你会获得一个无效的例外。

• 正确开标

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