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();
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