R 1不能被解析到一个变量 - 的Hello World [英] R cannot be resolved to a variable - Hello World

问题描述

我知道很多人有过这样的问题，我已搜查谷歌/堆栈溢出，但我有点仍然无法弄清我做错了。

 包的HelloWorld;
进口android.app.Activity;
进口android.os.Bundle;
进口android.widget.TextView;

公共类HelloWorldActivity延伸活动{
    / **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;
 // TextView的电视=新的TextView（本）;
 //字符串Hello =的Hello World！;
 // tv.setText（你好）;
 //的setContentView（TV）;
}
}
 

我试图寻找不必要的进口android.R; 语句，以及建筑/清洁/清爽/等等，但我似乎无法弄清楚。也许这是与我安装我的软件开发工具包的方式有问题？我不觉得有什么，但我很新的这所以很可能我的地方做了一个大错。

另外，我收到此错误：

[2011-12-13 18点18分46秒 - com.android.ide.eclipse.adt.internal.project.AndroidManifestHelper]分析器例外，C：\用户\ MYNAME \ Android的开发\的Hello World \的Hello World \的Andr​​oidManifest.xml：处理指令目标匹配[XX] [MM] [11]不允许

。

谁能帮助我？谢谢！

编辑：我的XML文件：

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;舱单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=的HelloWorld Mylove
    安卓版code =1
    机器人：VERSIONNAME =1.0＆GT;

    ＆LT;使用-SDK安卓的minSdkVersion =10/＆GT;

    ＆lt;应用
        机器人：图标=@可绘制/ ic_launcher
        机器人：标签=@字符串/ APP_NAME＆GT;
        ＆LT;活动
            机器人：名称=。HelloWorldActivity
            机器人：标签=@字符串/ APP_NAME＆GT;
            ＆LT;意向滤光器＆gt;
                ＆lt;作用机器人：名称=android.intent.action.MAIN/＆GT;

                ＆LT;类机器人：名称=android.intent.category.LAUNCHER/＆GT;
            ＆所述; /意图滤光器＆gt;
        ＆LT; /活性GT;
    ＆LT; /用途＆gt;

＆LT; /舱单＆GT;
 

解决方案

请参阅此行您的清单的（在开放的＆LT;舱单/＆GT; 标签）的

 包=的HelloWorld Mylove
 

这不是有效的软件包名称，必须改变。通常一个包名由小写的话，用点分隔出来，例如：

  com.hello.world
 

请参阅命名一个包。更改为一个有效的名称。

由于这是总的一些工作，因为你必须在不同的places¹改变它的（有时失败，我出于某种原因）的，我建议刚通过创建一个新项目在Eclipse中新的Andr​​oid项目向导。这会问你包的名称在步骤4。请一定要按照上面提到的命名约定。您应该结束了pretty的大同小异code。另外，您可以尝试在项目资源管理器在你的项目上单击右键，选择 Android的工具 - ＆GT;重命名应用程序包。

¹的显现出来，你的* .java文件都存储在文件夹中，源文件中的包语句的

I know many people have had this problem and I have searched Google/Stack Overflow, but I somehow still can't figure out what I'm doing wrong.

package HelloWorld;
import android.app.Activity;
import android.os.Bundle;    
import android.widget.TextView;

public class HelloWorldActivity extends Activity {
    /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
 //   TextView tv = new TextView(this);
 //   String hello = "Hello World!";
 //   tv.setText(hello);
 //   setContentView(tv);
}
}

I tried searching for unnecessary import android.R; statements, as well as building/cleaning/refreshing/etc, but I just can't seem to figure it out. Maybe it's a problem with the way I've installed my SDKs? I don't think there is, but I'm very new to this so it's likely I made a blunder somewhere.

Also, I am getting this error:

[2011-12-13 18:18:46 - com.android.ide.eclipse.adt.internal.project.AndroidManifestHelper] Parser exception for C:\Users\MYNAME\Android Development\Hello World\Hello World\AndroidManifest.xml: The processing instruction target matching "[xX][mM][lL]" is not allowed.

Can anyone help me? Thanks!

EDIT: My XML file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="HelloWorld Mylove"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".HelloWorldActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

解决方案

See this line in your manifest (at the opening of the <manifest /> tag)

package="HelloWorld Mylove"

That's not a valid package name and has to change. Usually a package name consists out of lowercase words, seperated by dots, e.g.:

com.hello.world

See Naming a Package. Change this to a valid name.

Since this is overall a bit of work, because you have to change it in various places¹ (and sometimes failed for me for some reason), I'd recommend just creating a new project via the new android project wizard in eclipse. This will ask you for a package name in step 4. Make sure to follow the naming conventions mentioned above. You should end up with pretty much the same code. Alternatively you can try to right-click on your project in the project explorer and select Android Tools -> Rename Application Package.

¹ The manifest itself, the folders where your *.java files are stored, the package statement within the source files

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