在android-sdk-linux_x86/platforms/android-10/data/layoutlib.jar中包含了source中internal的api，在eclipse中导入这个jar包就可以使用internal的api了。
导入方法：
1. Right-click the project in Eclipse and select "Build Path -> Add Libraries...".
2. Select User Library from the list and click Next.
3. Click the "User Libraries..." button.
4. Click "New..." in the User Libraries dialog.
5. Give the user library a name and select the System library checkbox and click OK.
6. Highlight the newly added user library in the list and click the "Add JARs..." button and add the desired jar files.
7. Click OK on the User Libraries dialog.
8. Make sure the new user library is checked in the Add Library dialog and
不以这种方式添加会出现DEX error，切记