片段 - InstantiationException:没有空的构造 - >谷歌地图V2? [英] Fragment - InstantiationException: no empty Constructor -> Google Maps v2?
问题描述
我收到此错误信息,当我通过应用程序,更改按钮重新打开关闭的应用程序:
产生的原因:java.lang.InstantiationException:。不能实例化类COM * FragmentContact $ 1;没有空的构造
我发现有关内类的几个技巧,并让他们静等,但这些FragmentContact是公开类中的 *。java的文件和< STRONG>有一个公共的空构造。 我使用谷歌地图API V2在这个项目中,做一招地方从互联网上设置我的图形页面。看看这里:
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,捆绑savedInstanceState){
视图V = inflater.inflate(R.layout.fragment_contact,NULL);
尝试 {
MapsInitializer.initialize(this.getActivity()getApplicationContext());
}赶上(GooglePlayServicesNotAvailableException E){
e.printStackTrace();
}
片段=新SupportMapFragment(){
@覆盖
公共无效onActivityCreated(包savedInstanceState){
super.onActivityCreated(savedInstanceState);
MMAP = fragment.getMap();
如果(MMAP!= NULL){
setupMap();
}
}
};
。getFragmentManager()的BeginTransaction()代替(R.id.fragment_orte_map_parent,片段).commit();
返回伏;
}
当我将这个图形页面,事出一切工作正常。也许有人可以解释我做错了。
我的完整的堆栈跟踪:
04-17 16:15:22.115:E / AndroidRuntime(22182):致命异常:主要
04-17 16:15:22.115:E / AndroidRuntime(22182):java.lang.RuntimeException的:无法启动的活动ComponentInfo {* COM / COM * MainActivity。}:android.support.v4.app.Fragment $ InstantiationException :无法实例片段COM * FragmentContact $ 1:确保类名称存在,是公开的,并且有一个空的构造是公
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2357)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread.access $ 600(ActivityThread.java:153)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1247)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.os.Handler.dispatchMessage(Handler.java:99)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.os.Looper.loop(Looper.java:137)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread.main(ActivityThread.java:5226)
04-17 16:15:22.115:E / AndroidRuntime(22182):在java.lang.reflect.Method.invokeNative(本机方法)
04-17 16:15:22.115:E / AndroidRuntime(22182):在java.lang.reflect.Method.invoke(Method.java:511)
04-17 16:15:22.115:E / AndroidRuntime(22182):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:795)
04-17 16:15:22.115:E / AndroidRuntime(22182):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-17 16:15:22.115:E / AndroidRuntime(22182):在dalvik.system.NativeStart.main(本机方法)
04-17 16:15:22.115:E / AndroidRuntime(22182):android.support.v4.app.Fragment $ InstantiationException:产生的原因无法实例片段COM * FragmentContact $ 1:确保类名称存在,是公众,并有一个空的构造是公
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.support.v4.app.Fragment.instantiate(Fragment.java:405)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1767)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:208)
04-17 16:15:22.115:E / AndroidRuntime(22182):在COM * MainActivity.onCreate(MainActivity.java:20)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.Activity.performCreate(Activity.java:5104)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)
04-17 16:15:22.115:E / AndroidRuntime(22182):11 ...更多
04-17 16:15:22.115:E / AndroidRuntime(22182):java.lang.InstantiationException:产生的原因。不能实例化类COM * FragmentContact $ 1;没有空的构造
04-17 16:15:22.115:E / AndroidRuntime(22182):在java.lang.Class.newInstanceImpl(本机方法)
04-17 16:15:22.115:E / AndroidRuntime(22182):在java.lang.Class.newInstance(Class.java:1319)
04-17 16:15:22.115:E / AndroidRuntime(22182):在android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-17 16:15:22.115:E / AndroidRuntime(22182):18 ...更多
但这些FragmentContact是一个公共类A *的.java文件,并有一个公共的空构造。
该错误不抱怨 FragmentContact
。这是抱怨的第一个内部类 FragmentContact
的( FragmentContact $ 1
)。你不能有一个片段
实现为一个内部类的东西,因为它不能从外部类以外的实例化。 A 静态
内部类是好的。
I get this error message, when I open a closed App again via App-Change button:
Caused by: java.lang.InstantiationException: can't instantiate class com.*.FragmentContact$1; no empty constructor
I've found several tips about Inner-Classes and to make them static etc. But these FragmentContact is a public class in a *.java-file and has a public empty constructor. I'm using Google Maps Api v2 in this project and do a trick somewhere from the internet to setup my MapView. Look here:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_contact, null);
try {
MapsInitializer.initialize(this.getActivity().getApplicationContext());
} catch (GooglePlayServicesNotAvailableException e) {
e.printStackTrace();
}
fragment = new SupportMapFragment() {
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mMap = fragment.getMap();
if (mMap != null) {
setupMap();
}
}
};
getFragmentManager().beginTransaction().replace(R.id.fragment_orte_map_parent, fragment).commit();
return v;
}
When I cut this MapView-thing out everything work fine. Maybe someone can explain what I'm doing wrong.
My complete Stacktrace:
04-17 16:15:22.115: E/AndroidRuntime(22182): FATAL EXCEPTION: main
04-17 16:15:22.115: E/AndroidRuntime(22182): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.*/com.*.MainActivity}: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.*.FragmentContact$1: make sure class name exists, is public, and has an empty constructor that is public
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2357)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread.access$600(ActivityThread.java:153)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.os.Handler.dispatchMessage(Handler.java:99)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.os.Looper.loop(Looper.java:137)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread.main(ActivityThread.java:5226)
04-17 16:15:22.115: E/AndroidRuntime(22182): at java.lang.reflect.Method.invokeNative(Native Method)
04-17 16:15:22.115: E/AndroidRuntime(22182): at java.lang.reflect.Method.invoke(Method.java:511)
04-17 16:15:22.115: E/AndroidRuntime(22182): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
04-17 16:15:22.115: E/AndroidRuntime(22182): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
04-17 16:15:22.115: E/AndroidRuntime(22182): at dalvik.system.NativeStart.main(Native Method)
04-17 16:15:22.115: E/AndroidRuntime(22182): Caused by: android.support.v4.app.Fragment$InstantiationException: Unable to instantiate fragment com.*.FragmentContact$1: make sure class name exists, is public, and has an empty constructor that is public
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.support.v4.app.Fragment.instantiate(Fragment.java:405)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.support.v4.app.FragmentState.instantiate(Fragment.java:97)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1767)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:208)
04-17 16:15:22.115: E/AndroidRuntime(22182): at com.*.MainActivity.onCreate(MainActivity.java:20)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.Activity.performCreate(Activity.java:5104)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2261)
04-17 16:15:22.115: E/AndroidRuntime(22182): ... 11 more
04-17 16:15:22.115: E/AndroidRuntime(22182): Caused by: java.lang.InstantiationException: can't instantiate class com.*.FragmentContact$1; no empty constructor
04-17 16:15:22.115: E/AndroidRuntime(22182): at java.lang.Class.newInstanceImpl(Native Method)
04-17 16:15:22.115: E/AndroidRuntime(22182): at java.lang.Class.newInstance(Class.java:1319)
04-17 16:15:22.115: E/AndroidRuntime(22182): at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
04-17 16:15:22.115: E/AndroidRuntime(22182): ... 18 more
But these FragmentContact is a public class in a *.java-file and has a public empty constructor.
The error is not complaining about FragmentContact
. It is complaining about the first inner class of FragmentContact
(FragmentContact$1
). You cannot have a Fragment
implemented as an inner class of anything, as it cannot be instantiated from outside the outer class. A static
inner class is fine.
这篇关于片段 - InstantiationException:没有空的构造 - &GT;谷歌地图V2?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!