Android的 - activity_main不能得到解决或不是场 [英] Android - activity_main cannot be resolved or is not a field
问题描述
previous人都有过相同的错误消息,但解决方案一直删除或修改一些进口android.R。我没有这样的进口,所以我真的失去了
我想获得一个样品的Android谷歌地图程序的运行。
我下面这个教程。 <一href="http://www.vogella.com/articles/AndroidGoogleMaps/article.html">http://www.vogella.com/articles/AndroidGoogleMaps/article.html
不过,日食给了我这个错误,当我粘贴在code:activity_main不能得到解决或不是场
这发生在MainActivity在这个片段中的code
公共布尔onCreateOptionsMenu(功能菜单){
。getMenuInflater()膨胀(R.menu.activity_main,菜单);
返回true;}
特定的错误是在R.menu.activity_main的部分。
下面是我的activity_main.xml文件。
&LT; RelativeLayout的的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:layout_width =match_parent
机器人:layout_height =match_parent
工具:上下文=MainActivity。&GT;
&LT;片段
机器人:ID =@ + ID /图
机器人:layout_width =match_parent
机器人:layout_height =match_parent
类=com.google.android.gms.maps.MapFragment/&GT;
&LT; / RelativeLayout的&GT;
这里是我的全部MainActivity.java类
包com.example.mapssample;
进口android.app.Activity;
进口android.os.Bundle;
进口android.view.Menu;
进口com.google.android.gms.maps.CameraUpdateFactory;
进口com.google.android.gms.maps.GoogleMap;
进口com.google.android.gms.maps.MapFragment;
进口com.google.android.gms.maps.model.BitmapDescriptorFactory;
进口com.google.android.gms.maps.model.LatLng;
进口com.google.android.gms.maps.model.Marker;
进口com.google.android.gms.maps.model.MarkerOptions;
公共类MainActivity延伸活动{
static final的经纬度HAMBURG =新的经纬度(53.558,9.927);
static final的经纬度基尔=新的经纬度(53.551,9.993);
私人GoogleMap的地图;
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
地图=((MapFragment)getFragmentManager()。findFragmentById(R.id.map))
.getMap();
标记汉堡= map.addMarker(新MarkerOptions()。位置(汉堡)
.title伪(汉堡));
标记基尔= map.addMarker(新MarkerOptions()
.position(基尔)
.title伪(基尔)
是.snippet(基尔是酷)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
//瞬间将相机与汉堡的15变焦。
map.moveCamera(CameraUpdateFactory.newLatLngZoom(汉堡,15));
//放大,相机动画。
map.animateCamera(CameraUpdateFactory.zoomTo(10),2000,NULL);
}
@覆盖
公共布尔onCreateOptionsMenu(功能菜单){
。getMenuInflater()膨胀(R.menu.activity_main,菜单);
返回true;
}
}
感谢您提前为您的帮助。对不起,我的code一些靠不住的缩进,我不停地给四个额外的空间,以使其显示为code和它有一点点奇怪。
新建,错误日志。
感谢你这么多,你有什么想法,这是什么意思?
06-07 22:45:25.226:E / AndroidRuntime(29901):致命异常:主要
06-07 22:45:25.226:E / AndroidRuntime(29901):java.lang.NoClassDefFoundError的:com.google.android.gms.R $设置样式
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(来源不明)
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.google.android.gms.maps.MapFragment.onInflate(来源不明)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.Activity.onCreateView(Activity.java:4713)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.view.LayoutInflater.inflate(LayoutInflater.java:489)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.view.LayoutInflater.inflate(LayoutInflater.java:396)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.view.LayoutInflater.inflate(LayoutInflater.java:352)
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:260)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.Activity.setContentView(Activity.java:1893)
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.example.mapssample.MainActivity.onCreate(MainActivity.java:23)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.Activity.performCreate(Activity.java:5058)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2174)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.ActivityThread.access $ 700(ActivityThread.java:141)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1267)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.os.Handler.dispatchMessage(Handler.java:99)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.os.Looper.loop(Looper.java:137)
06-07 22:45:25.226:E / AndroidRuntime(29901):在android.app.ActivityThread.main(ActivityThread.java:5059)
06-07 22:45:25.226:E / AndroidRuntime(29901):在java.lang.reflect.Method.invokeNative(本机方法)
06-07 22:45:25.226:E / AndroidRuntime(29901):在java.lang.reflect.Method.invoke(Method.java:511)
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:792)
06-07 22:45:25.226:E / AndroidRuntime(29901):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
06-07 22:45:25.226:E / AndroidRuntime(29901):在dalvik.system.NativeStart.main(本机方法)
1),那么你的布局文件存在吗?它是在布局文件夹,然后应该不会是
R.layout.activity_main
2)你仍然需要导入您的项目中R档
com.example.mapssample.R;
3)如果在你的code无差错R档自动生成。有时,当你无法解决R档错误意味着你有问题,其他地方的项目。尝试清洁工程。它可能的帮助。
4)你并不真正需要的菜单,用于测试项目。你也表明activity_main文件已经包含在项目,这就是布局文件夹中。刚刚发表评论的菜单部分,看看。
Previous people have had the same error message, but the solution has always been to remove or modify some import "android.R". I have no such import so I'm really lost
I'm trying to get a sample android google maps program running.
I'm following this tutorial. http://www.vogella.com/articles/AndroidGoogleMaps/article.html
However, eclipse gives me this error when I paste over the code: "activity_main cannot be resolved or is not a field"
This happens in MainActivity in this snippet of code
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;}
The specific error is in the "R.menu.activity_main" part.
Here is my activity_main.xml file.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</RelativeLayout>
And here is my full MainActivity.java class
package com.example.mapssample;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
public class MainActivity extends Activity {
static final LatLng HAMBURG = new LatLng(53.558, 9.927);
static final LatLng KIEL = new LatLng(53.551, 9.993);
private GoogleMap map;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = map.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Thank you in advance for all your help. Sorry for some wonky indenting in my code, I kept giving four extra spaces to make it appear as code and it got a little weird.
New, error log.
Thank you so much, do you have any idea what this means?
06-07 22:45:25.226: E/AndroidRuntime(29901): FATAL EXCEPTION: main
06-07 22:45:25.226: E/AndroidRuntime(29901): java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.google.android.gms.maps.MapFragment.onInflate(Unknown Source)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.Activity.onCreateView(Activity.java:4713)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:260)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.Activity.setContentView(Activity.java:1893)
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.example.mapssample.MainActivity.onCreate(MainActivity.java:23)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.Activity.performCreate(Activity.java:5058)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2174)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.ActivityThread.access$700(ActivityThread.java:141)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1267)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.os.Looper.loop(Looper.java:137)
06-07 22:45:25.226: E/AndroidRuntime(29901): at android.app.ActivityThread.main(ActivityThread.java:5059)
06-07 22:45:25.226: E/AndroidRuntime(29901): at java.lang.reflect.Method.invokeNative(Native Method)
06-07 22:45:25.226: E/AndroidRuntime(29901): at java.lang.reflect.Method.invoke(Method.java:511)
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
06-07 22:45:25.226: E/AndroidRuntime(29901): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
06-07 22:45:25.226: E/AndroidRuntime(29901): at dalvik.system.NativeStart.main(Native Method)
1) Where does your layout file exist? is it under layout folder then shouldn't it be
R.layout.activity_main
2) You still have to import your projects R file
com.example.mapssample.R;
3) R file is automatically generated if there's no error in your code. Sometimes when you get can't resolve R file error means you have problem somewhere else in the project. Try clean project. It might help.
4) You don't really need menu for testing this project. Also the activity_main file you showed is already included in the project and that's in layout folder. Just comment the menu part and see.
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