获取未安装的APK图标

/*  
 * 采用了新的办法获取APK图标，之前的失败是因为android中存在的一个BUG,通过  
 * appInfo.publicSourceDir = apkPath;来修正这个问题，详情参见:  
 * http://code.google.com/p/android/issues/detail?id=9151  
 */    
public static Drawable getApkIcon(Context context, String apkPath) {    
    PackageManager pm = context.getPackageManager();    
    PackageInfo info = pm.getPackageArchiveInfo(apkPath,    
            PackageManager.GET_ACTIVITIES);    
    if (info != null) {    
        ApplicationInfo appInfo = info.applicationInfo;    
        appInfo.sourceDir = apkPath;    
        appInfo.publicSourceDir = apkPath;    
        try {    
            return appInfo.loadIcon(pm);    
        } catch (OutOfMemoryError e) {    
            Log.e("ApkIconLoader", e.toString());    
        }    
    }    
    return null;    
}