关于android.os.SystemProperties的使用

最新推荐文章于 2024-10-10 11:40:28 发布

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本文介绍了如何在Android项目中正确导入第三方库layoutlib.jar，并解决了在编译过程中出现的Java堆内存溢出错误。提供了修改eclipse.ini文件的具体步骤及使用用户库的方法。

android.os.SystemProperties在SDK的库中是没有的，需要把Android SDK 目录下data下的layoutlib.jar文件加到当前工程的附加库路径中，然后在源程序中就可以Import了。

但是这样做会出现一个问题，编译的时候会报错：Unable to execute dex: Java heap space 。在网上找了一下，这个链接比较有帮助：http://programfeelings.blogspot.com/2011/03/unable-to-execute-dex-java-heap-space.html

上面这个链接需要翻墙才能访问，我把内容复制在下面：


最近要用到第三方的庫android-sdk-windows\platforms\android-8\data\layoutlib.jar，但出現Conversion to Dalvik format failed: Unable to execute dex: null這個問題。且出現對話方塊

As Android developer, I have met a strange problem when I want use a third party jar, it remained me that:
Dex Loader] Unable to execute dex: null
Conversion to Dalvik format failed: Unable to execute dex: null
out of memory error…An internal error occurred during: “Build Project”.
Java heap space

This is the DEX Error，I find the solutions by Google, one way is to modify the eclipse.ini, you can increase the memory allocated in eclipse.ini to this: -Xms128m -Xmx512m or something higher, but this didn’t work for me. After modify the eclipse.ini, I cannot start the eclipse. By StackOverflow, I find a solution:

eclipse.ini file must have -vm on first line and path on second line. don’t try to put everything into one line!
-vm
C:\Program Files\Java\jdk1.6.0_07\bin\javaw.exe

After add the -vm and the path in my eclipse.ini, I can start my Eclipse and the problem has been resolved.

Another way to solve the ” Conversion to Dalvik format failed: Unable to execute dex: null” problem is using the user library, the concrete steps are as follows:
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 …