Android Problem on Widget ImageButton click

Question

I'm new in Android development, and my English is awfull.

I have an application with a homescreen widget.

When I start application, in main activity, I can select options for widget (these options are saved to a DB).

Then, I add a Widget, that it have an ImageButton on it, to the homescreen. The click on ImageButton works fine.

If I kill the application activity with some Task Manager, delete the widget, and add it again. The click on ImageButton crash.

Is this normally?

Here you have the error:

java.lang.RuntimeException: Unable to start service cat.aat.quoteswidget.Widget$UpdateService@45d1b188 with Intent { cmp=cat.aat.quoteswidget/.Widget$UpdateService }: java.lang.NullPointerException
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3282)
at android.app.ActivityThread.access$3600(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2211)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:144)
at android.app.ActivityThread.main(ActivityThread.java:4937)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at cat.aat.quoteswidget.Widget$UpdateService.buildUpdate(Widget.java:130)
at cat.aat.quoteswidget.Widget$UpdateService.onStart(Widget.java:90)
at android.app.Service.onStartCommand(Service.java:420)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3267)
... 10 more

Thanks!

Answer 1

在Widget.java文件的第130行的UpdateService的buildUpdate()方法中，您有一个NullPointerException 。