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带有列表导航的 Android ActionBar : save selected item position during configuration change?

我有一个带有列表导航模式的ActionBar。问题是从导航微调器中选择项目后,当屏幕方向更改时,导航微调器选择的索引重置为0。如何在配置更改期间保留微调器的选定索引?谢谢 最佳答案 你应该覆盖onSaveInstanceState并将选定的导航列表位置保存到bundle中。不要忘记在onCreate中恢复位置.看下面的例子:publicclassMainActivity{privatestaticfinalStringCURRENT_FRAGMENT_TAG="fragmentPosition";@Inject@Named("nav

android.support.v4.app.FragmentPagerAdapter getItem(int position) 被调用两次?

我有一个包含fragment的View寻呼机。当fragment寻呼机适配器第一次被实例化时,必须实现的getItem(intposition)方法被调用两次,这在fragment中造成了麻烦,因为我正在根据位置获取数据。因此,例如,LOG打印显示它首先是位置0,然后是位置1。知道为什么会这样吗?我在这里遵循示例:http://wptrafficanalyzer.in/blog/implementing-horizontal-view-swiping-using-viewpager-and-fragmentpageradapter-in-android/ 最

java - 安卓 2.2 : How to make an app to run automaticly on startup & how to make an app start another app

主题几乎说明了一切。 最佳答案 使用BroadcastReceiver接收ActionBOOT_COMPLETED的Intent。在onReceive()方法中为您的Activity创建一个Intent:@OverridepublicvoidonReceive(Contextcontext,Intentintent){IntentmyIntent=newIntent(context,YourActivity.class);context.startActivity(myIntent);}

android - ACTION_DISCOVERY_STARTED 从未调用过 android

我有下一个代码:publicclassAddPrinterextendsListActivity{@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);bluetoothAdapter.startDiscovery();filter=newIntentFilter();filter.addAction(BluetoothDevice.ACTION_FOUND);filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_S

安卓NDK : Function va_start/va_end could not be resolved

我试图在我的项目中使用va_start和va_end函数,但eclipse不想将其解析为函数。gcc编译整个项目没有错误...[我的文件.cpp]#include#include[...]inlinevoidShowDbgMsg(constchar*str,...){va_listargptr;va_start(argptr,str);vprintf(str,argptr);va_end(argptr);}[...][Android.mk][...]LOCAL_C_INCLUDES:=jni/pvrTools/jni/igel/$(STLPORT_BASE)/stlport[...]e

android - 权限拒绝 : starting Intent sharing with gmail

我尝试在我的应用程序中与gmail共享一些文本:StringshareBody="blablabla";IntentsharingIntent=newIntent(Intent.ACTION_VIEW);sharingIntent.setType("plain/text");sharingIntent.setClassName("com.google.android.gm","com.google.android.gm.ComposeActivityGmail");sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,"

flutter Bloc : No ancestor could be found starting from the context?

我是Flutter的新手,也是Bloc的新手。编译代码时出现错误:ThefollowingassertionwasthrownbuildingLogin(dirty,state:_LoginFormState#44e7f):BlocProvider.of()calledwithacontextthatdoesnotcontainaBlocoftypeBtnBloc.NoancestorcouldbefoundstartingfromthecontextthatwaspassedtoBlocProvider.of().Thiscanhappenifthecontextyouusecome

flutter Bloc : No ancestor could be found starting from the context?

我是Flutter的新手,也是Bloc的新手。编译代码时出现错误:ThefollowingassertionwasthrownbuildingLogin(dirty,state:_LoginFormState#44e7f):BlocProvider.of()calledwithacontextthatdoesnotcontainaBlocoftypeBtnBloc.NoancestorcouldbefoundstartingfromthecontextthatwaspassedtoBlocProvider.of().Thiscanhappenifthecontextyouusecome

java - 解决SecurityException : Permission Denial: starting Intent. 我需要什么权限?

我想从应用程序打开Play商店。在三星还好,在一加手机就失败了。我不知道alibaba是从哪里来的。很奇怪。异常java.lang.SecurityException:权限被拒绝:启动Intent{act=android.intent.action.VIEWdat=http://play.google.com/...cmp=com.alibaba.intl.android.apps.poseidon/com.alibaba.android.intl.weex.activity.WeexPageActivity}来自ProcessRecord{a1dd30c15827:a2bliving

android - 类 PagerAdapter (android) 中 instantiateItem 函数中 'position' 的混淆

我目前正在学习水平View分页教程:http://mobile.tutsplus.com/tutorials/android/android-user-interface-design-horizontal-view-paging/出于测试目的,我在instantiateItem(...)函数中添加了以下行作为第一行:Log.d("SimpleViewPagerActivity","Position"+position);(以下内容令人困惑,所以如果您自己尝试示例以了解我在以下段落中谈论的内容会更好):在此示例中,有5个ViewPager位置(从零开始)并且Activity设置为从位置