我試圖建立一個插件系統,其中DexClassLoader從其他已安裝的包含碎片(我的插件)的apks獲取代碼,並在我的主機中顯示它們。這工作很好。DexClassLoader,重新加載代碼失敗,Signal 7
我也喜歡使插件hotswappable,這意味着我可以從插件更改代碼,安裝新的和主機會注意到並將加載新的代碼。如果我第一次更改代碼,這也適用。 (雖然我認爲它不應該,似乎我有這個代碼的一個錯誤的認識:
try {
requiredClass = Class.forName(fullName);
} catch(ClassNotFoundException e) {
isLoaded = false;
}
)
,如果我用同樣的插件,主機嘗試它第二次在requiredClass = classLoader.loadClass(fullName);
關閉與0x596ed4d6(代碼= 2)類似
libc的致命信號7(SIGBUS),螺紋28814 (ctivityapp.host)
有沒有人對DexClassLoader的功能有更深入的瞭解,並告訴我,這裏發生了什麼?我很堅持這一點。
繼承人的方法的完整的代碼加載外部代碼:
/**
* takes the name of a package as String, and tries to load the code from the corresponding akp using DexclassLaoder.
* Checking if a package is a valid plugin must be done before calling this.
* The Plugin must contain a public class UI that extends Fragment and implements plugin as a starting point for loading
* @param packageName The full name of the package, as String
* @return the plugins object if loaded, null otherwise
*/
private Plugin attachPluginToHost(String packageName) {
try {
Class<?> requiredClass = null;
final ApplicationInfo info = context.getPackageManager().getApplicationInfo(packageName,0);
final String apkPath = info.sourceDir;
final File dexTemp = context.getDir("temp_folder", 0);
final String fullName = packageName + ".UI";
boolean isLoaded = true;
// Check if class loaded
try {
requiredClass = Class.forName(fullName);
} catch(ClassNotFoundException e) {
isLoaded = false;
}
if (!isLoaded) {
final DexClassLoader classLoader = new DexClassLoader(apkPath, dexTemp.getAbsolutePath(), null, context.getApplicationContext().getClassLoader());
requiredClass = classLoader.loadClass(fullName);
}
if (null != requiredClass) {
// Try to cast to required interface to ensure that it's can be cast
final Plugin plugin = Plugin.class.cast(requiredClass.newInstance());
installedPlugins.put(plugin.getName(), plugin);
return plugin;
}
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
提前非常感謝!
如果您正在提取的apk/zip稱爲「myapp.apk」,則在DexClassLoader提取它的緩存目錄中會有一個「myapp.dex」文件。在爲新的apk/zip創建一個新的'DexClassLoader'之前刪除該文件,它確實可以工作。 – Dauntless 2016-01-26 08:40:58