在Eclipse中開發android的應用程式時，有時想檢視函式的內部實現，但是當在函式上點選ctrl和滑鼠左鍵的時候，

往往出現如下提示： 

Class File Editor

Source not found

The JAR of this class file belongs to container 'Android'  which does not allow modifications to source attachments on its entries.

因此按照如下操作新增對應的原始碼：

選擇workspace 裡面的專案，點選右鍵--->Build Path-->configure build path -->liberaries-->選擇一個jar包--->點選左側的展開三角按鈕--->

展開後選擇Source attachment --->點選右側的 Edit 按鈕--->彈出對話方塊，並選擇External File---->找到指定的原始檔壓縮包。或者可使用外部原始檔目錄。點選OK。

進去以後發現還是不能檢視，同樣的提示！

仔細讀英文的後半部分，在libs中直接引用的第三方jar包不讓其做任何修改。包括新增原始檔參看。

因此在android工程下新建一個lib目錄，將jar包從libs轉移到lib中。然後重複以上過程。

結果就可以查看了！不過一執行你的程式，馬上報錯無法找到class的錯誤。 = =!  死衚衕了~

看來只能將第三方jar放到libs了。

有的牛人這樣解決了：

In order to link the sources and javadoc to a .jar library that is automatically linked by Eclipse you have to do the following.

1. Place all three .jar files in the libs folder.
2. Create .properties file in the libs folder with the name of the library .jar (see example).
3. Specify the relative paths to the sources and javadoc .jar in the .properties file.
4. Close and re-open the Eclipse project! Optionally refresh the project.
5. Select an object of the linked library in the source code.
6. Open the Javadoc view in Eclipse to check the documentation (see screenshot).
7. Open the source code declaration (default shortcut: F3) of the selected object.

<code style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="str" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">/libs/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.jar</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">
</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">libs</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.jar</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">properties
</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">libs</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">javadoc</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">jar
</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">libs</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">/</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">sources</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">jar</span></code>

Contents of gson-2.2.2.jar.properties

<code style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;"><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">src</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">=</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">sources</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">jar
doc</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">=</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">gson</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2.2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="lit" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent; color: rgb(128, 0, 0);">2</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">-</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">javadoc</span><span class="pun" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">.</span><span class="pln" style="margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; background-color: transparent;">jar</span></code>

You can of course move the javadoc and sources .jar into other folders and specify relative paths. That's up to you.

最終，我想到了一個解決辦法：

新建一個lib目錄

將需要的jar包全部拷貝到該目錄下

依次對每個jar包執行 上面綠色 部分操作

完成後右鍵lib目錄，點選build path--> use as source folder

即可解決檢視原始碼的問題，也可使程式正常執行。

在Eclipse中開發android的應用程式時，有時想檢視函式的內部實現，但是當在函式上點選ctrl和滑鼠左鍵的時候，

往往出現如下提示： 

Class File Editor

Source not found

The JAR of this class file belongs to container 'Android'  which does not allow modifications to source attachments on its entries.

最普遍常見的是android-support-v4沒法看到其中的註釋和原始碼，滑鼠放到類上提示：

Note: This element neither has attached source nor attached Javadoc and hence no Javadoc could be found.

一般來說如果環境配置好了，Android的所有類和所有方法都能看到其程式碼和註釋，以下分兩步，將註釋和程式碼全部配置正確。

1.Android本身jar包的原始碼

這裡假設已經把需要下載的都下載下來了，右鍵專案====》build path====》configure build path

在libraries裡選擇Android x.x.x裡面有Android.jar，這就是開發時所依賴的Android本身的sdk的jar包，點開，裡面有兩個需要配置，

source attachment和javadoc location，前者是原始碼，配置好後可實現ctrl+滑鼠左鍵直接點開想看的Android的類，

後者是原始碼的註釋檔案，配置好後可實現滑鼠放在想看到類上，會顯示出來這個類或者方法的介紹

選擇source attachment配置項，點選右邊edit，選擇external location===》external folder，然後找到正確的路徑，我的是在E:/eclipse/sdk/sources/android-19

選擇javadoc location配置項，edit，選擇javadoc url===》browse，然後找到正確路徑，我的是在file:/E:/eclipse/sdk/docs/reference

完成上面這些就可以正常檢視Android內部常用的類註釋和原始碼了

2.檢視外部依賴jar包的原始碼

這裡假設你已經把外部依賴的jar包正確匯入並且編譯通過了，但是ctrl+滑鼠左鍵想看程式碼或者想看其註釋卻不可行的情況，

首先在libs下面找到引入的包，這裡以android-support-v4.jar為例，

在libs下新建android-support-v4.jar.properties檔案，即與引用的jar包同名最後加上.properties的檔案

其內容如下：

src = E:\\eclipse\\sdk\\extras\\android\\support\\v4\\src

這裡路徑要根據你自己的路徑進行調整，配置之後退出eclipse，在進入，就可以正常查看了。

作者：jason0539