Android Honeycomb上的DexClassLoader

Question

我正在研究一个试图通过DexClassLoader加载外部库的项目.这在2.3中非常有效:

    public class FormularDisplayLoader {
public final static String PATH ="/data/data/at.mSystem.client/files/mSystem_Client_FormularLibrary.jar";
        private DexClassLoader classLoader;

            public FormularDisplayLoader(Context context){
                    this.context = context;
                    this.classLoader = new DexClassLoader("/data/data/at.mSystem.client/
    files/mSystem_Client_FormularLibrary.jar",
                        context.getFilesDir().getAbsolutePath(),
                        null,
                        FormularDisplayLoader.class.getClassLoader());
            }

            public View getDisplay(String className) throws ErrorCodeException{
                    try {
                            Class c = classLoader.loadClass(className);
                            Method m = c.getMethod("getDisplay", Context.class);
                            View ret = (View) m.invoke(c.newInstance(), context);
                            return ret;
                    } catch (Exception e) {
                            e.printStackTrace();
                            throw new
    ErrorCodeException(FormularErrorCode.NO_DISPLAY_AVAILABLE_FOR_FORMULAR);
                    }
            }

    }

不幸的是,当尝试将此应用程序移植到Honeycomb时(因为此应用程序的实际目标是平板电脑),DexClassLoader会抛出异常:

02-23 09:30:58.221: ERROR/dalvikvm(8022): Can't open dex cache '/data/
dalvik-cache/
data@d...@at.mSystem.client@files@mSystem_Client_FormularLibrary....@classes.dex':
No such file or directory
02-23 09:30:58.221: INFO/dalvikvm(8022): Unable to open or create
cache for /data/data/at.mSystem.client/files/
mSystem_Client_FormularLibrary.jar (/data/dalvik-cache/
data@d...@at.mSystem.client@files@mSystem_Client_FormularLibrary....@classes.dex)
02-23 09:30:58.231: WARN/System.err(8022):
java.lang.ClassNotFoundException:
at.mSystem.client.formular.contract.ContractListFormularDisplay in
loader dalvik.system.DexClassLoader@40630308
02-23 09:30:58.241: WARN/System.err(8022):     at
dalvik.system.DexClassLoader.findClass(DexClassLoader.java:240)
02-23 09:30:58.241: WARN/System.err(8022):     at
java.lang.ClassLoader.loadClass(ClassLoader.java:548)
02-23 09:30:58.261: WARN/System.err(8022):     at
java.lang.ClassLoader.loadClass(ClassLoader.java:508)
02-23 09:30:58.261: WARN/System.err(8022):     at
at.mSystem.client.system.formularmodule.formular.FormularDisplayLoader.getDisplay(FormularDisplayLoader.java:
35)

似乎DexClassLoader忽略了第2个参数(dexOutputDir),因为我的示例中的context.getFilesDir().getAbsolutePath()的值是"/ data/data/at.mSystem.client/files".

你有任何想法如何解决？或者这是某种蜂窝虫？

谢谢,

罗兰

Answer 1

查看更改历史记录，这应该在 Android 3.1 中得到修复。