安卓中出现过的一些容易被忽略的异常整理

1.在外部开启activity时需要新开一个task,从service里开启activity时出现了这个异常。

w/system.err: android.util.androidruntimeexception: calling startactivity() from outside of an activity context requires the flag_activity_new_task flag. is this really what you want?
w/system.err:   at android.app.contextimpl.startactivity(contextimpl.java:944)
w/system.err:   at android.app.contextimpl.startactivity(contextimpl.java:931)

表示要添加一个flag,建议的flag_activity_new_task是一种activity启动方式，创建一个新的activity.

2.在setadapter()之后加addheaderview()会发生异常.

• when first introduced, this method could only be called before setting the adapter with setadapter(listadapter). starting with kitkat, this method may be called at any time.
• kitkat:october 2013: android 4.4, kitkat, another tasty treat. android 4.4之后可以在任何地方调用，4.4之前的版本都会报错。

w/system.err: java.lang.illegalstateexception: cannot add header view to list -- setadapter has already been called.
w/system.err:   at android.widget.listview.addheaderview(listview.java:257)
w/system.err:   at android.widget.listview.addheaderview(listview.java:286)

3.textview.settext()只能放charsequence类的参数，如果放的是整型数字，会报如下错误。

出现这个异常的原因的settext()里也可以放字符串资源id,如果放的是整形则会去r文件里找这个id对应的字符串，所以会出现notfoundexception的异常，即是找不到这个资源id所对应的文字。

注：charsequence类的子类有string,stringbuffer,stringbuilder

e/inputeventreceiver: exception dispatching input event.
e/messagequeue-jni: exception in messagequeue callback: handlereceivecallback
e/messagequeue-jni: android.content.res.resources$notfoundexception: string resource id #0x28

4.spinner设置监听问题

如果用onitemclicklistener会发生异常，异常如下。

setonitemclicklistener cannot be used with a spinner.

应该用onitemselectedlistener,这是一个很容易就会踩的坑。

w/system.err: java.lang.runtimeexception: unable to start activity 
java.lang.runtimeexception: setonitemclicklistener cannot be used with a spinner.
w/system.err:   at android.app.activitythread.performlaunchactivity(activitythread.java:2180)
w/system.err:   at android.app.activitythread.handlelaunchactivity(activitythread.java:2230)
w/system.err:   at android.app.activitythread.access$600(activitythread.java:141)
w/system.err:   at android.app.activitythread$h.handlemessage(activitythread.java:1234)
w/system.err:   at android.os.handler.dispatchmessage(handler.java:99)
w/system.err:   at android.os.looper.loop(looper.java:137)
w/system.err:   at android.app.activitythread.main(activitythread.java:5041)
w/system.err:   at java.lang.reflect.method.invokenative(native method)
w/system.err:   at java.lang.reflect.method.invoke(method.java:511)
w/system.err:   at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793)
w/system.err:   at com.android.internal.os.zygoteinit.main(zygoteinit.java:560)
w/system.err:   at dalvik.system.nativestart.main(native method)
w/system.err: caused by: java.lang.runtimeexception: setonitemclicklistener cannot be used with a spinner.

5.在service里调用progressdialog.show()方法时，会出现异常

如果没有将progress设为可悬浮在其它应用上方，并设置相应的权限，那么在service等其它组件中调用dialog.show()时，会无法获得当前windows，故无法正常显示dialog.

w/system.err: android.view.windowmanager$badtokenexception: unable to add window -- token null is not for an application
w/system.err:   at android.view.viewrootimpl.setview(viewrootimpl.java:571)
w/system.err:   at android.view.windowmanagerglobal.addview(windowmanagerglobal.java:246)
w/system.err:   at android.view.windowmanagerimpl.addview(windowmanagerimpl.java:69)
w/system.err:   at android.app.dialog.show(dialog.java:281)

//context传入为application
 progressdialog = new progressdialog(context);
    progressdialog.setmessage(msg);
    progressdialog.setcancelable(cancelable);
    progressdialog.setcanceledontouchoutside(false);
    progressdialog.show();

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对的支持。如果你想了解更多相关内容请查看下面相关链接