“包R不存在”从命令行使用Gradle构建时出错 [英] "Package R does not exist" error when building with Gradle from command line

问题描述

我正尝试从命令行创建 Android 项目，其中包含 Gradle ，但当我想要改变目录结构。

目前是这样的：

 。 
└──main 
├──AndroidManifest.xml 
├──ic_launcher-web.png 
├──java 
│└──com 
│└──myproject 
│└──MainActivity.java 
└──res 
├──... 
├──layout 
│├─ ─activity_main.xml 
│└──fragment_main.xml 
├──... 
 ... 
  

然后我执行：

  ./ gradlew clean build 
 
  >建立成功
  
好的。一切都好。但现在我想创建一个新目录，所以：
 
 
 
创建一个 ui 目录并移动 MainActivity.java  there：
 。 
└──main 
├──AndroidManifest.xml 
├──ic_launcher-web.png 
├──java 
│└──com 
│└──myproject 
│└──ui 
│└──MainActivity.java 
└──res 
├──... 
├─ ─布局
│├──activity_main.xml 
│└──fragment_main.xml 
├──... 
 ... 
 
  package com .myproject.ui; 
 
 //进口
 
公共类MainActivity扩展ActionBarActivity {
 ... 
} 
  
在 AndroidManifest.xml 中修改它的 android：name  
 $ b 
 < activity 
 android：name =。ui.MainActivity
 android： label =@ string / app_name> 
 ... 
< / activity> 
  
然后尝试再次编译它： 
 
 
  ./ gradlew clean build 
  
出现以下错误：
  /home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:19：error ：包R不存在
 setContentView（R.layout.activity_main）; 
 ^ 
 /home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:23：error：package R does not exist 
 .add（ R.id.container，new PlaceholderFragment（））
 ^ 
 /home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:33：error：package R不存在
 getMenuInflater（）。inflate（R.menu.main，menu）; 
 ^ 
 /home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:43：error：package R does not exist 
 if（id == R.id.action_settings）{
 ^ 
 /home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:60：error：package R does不存在
查看rootView = inflater.inflate（R.layout.fragment_main，container，false）; 
 
 BUILD FAILED 
  
我做错了什么？任何想法？
 
 
 
谢谢。
解决方案
您在您的活动中声明了错误的软件包。
 
 
 
确保包中包含com.example.blah; 声明你的Activity与你的 AndroidManifest.xml 中的包声明相匹配。
 
I'm attemping to build an Android project with Gradle from command line, but found a problem when I want to change the directory structure. 

Currently is like this:
.
└── main
    ├── AndroidManifest.xml
    ├── ic_launcher-web.png
    ├── java
    │   └── com 
    │       └── myproject
    │           └── MainActivity.java
    └── res 
        ├── ... 
        ├── layout
        │   ├── activity_main.xml
        │   └── fragment_main.xml
        ├── ... 
        ...
Then I execute:
./gradlew clean build
That ends with:
BUILD SUCCESSFUL
Ok. All fine. But now I want to create a new directory, so:

I create an ui directory and move MainActivity.java there:
.
└── main
    ├── AndroidManifest.xml
    ├── ic_launcher-web.png
    ├── java
    │   └── com
    │       └── myproject
    │           └── ui
    │               └── MainActivity.java
    └── res
        ├── ...
        ├── layout
        │   ├── activity_main.xml
        │   └── fragment_main.xml
        ├── ...
        ...
Modify its package:
package com.myproject.ui;

// imports

public class MainActivity extends ActionBarActivity {
    ...
}
Modify its android:name attribute in AndroidManifest.xml:
<activity 
    android:name=".ui.MainActivity" 
    android:label="@string/app_name" >
    ...
</activity>
And try to compile it again:
./gradlew clean build
With following errors:
/home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:19: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
/home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:23: error: package R does not exist
                    .add(R.id.container, new PlaceholderFragment())
                          ^
/home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:33: error: package R does not exist
        getMenuInflater().inflate(R.menu.main, menu);
                                   ^
/home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:43: error: package R does not exist
        if (id == R.id.action_settings) {
                   ^
/home/birei/MyDummyProject/MyProject/src/main/java/com/myproject/ui/MainActivity.java:60: error: package R does not exist
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);

BUILD FAILED
What am I doing wrong? Any ideas?

Thank you.
解决方案
This usually happens when you are declaring the wrong package in your Activity.

Make sure the package com.example.blah; declaration in your Activity matches the package declaration in your AndroidManifest.xml.

                        
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