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;  
    }