具体报错信息：

09-19 10:36:48.163 181-212/? W/Vold: Failed to unmount /storage/udisk (Device or resource busy, retries 6, action 0)
09-19 10:36:48.536 181-212/? E/ProcessKiller: Process com.example.petrochina_oil (27188) has open file /mnt/media_rw/udisk/ad_res/myupdates/petrochina_oil-v1.1.5-20190918_161401.apk

原因是因为文件占用：

/**
     * 获取apk包的信息：版本号，名称，图标等
     *
     * @param //absPath  apk包的绝对路径
     * @param //context 
     */
    public static ApplicationInfo apkInfo(String absPath, Context context) {
        ApplicationInfo appInfo = null;
        String version = "";
        PackageManager pm = context.getPackageManager();
        PackageInfo pkgInfo = pm.getPackageArchiveInfo(absPath, PackageManager.GET_ACTIVITIES);
        if (pkgInfo != null) {
            appInfo = pkgInfo.applicationInfo;
            /* 必须加这两句，不然下面icon获取是default icon而不是应用包的icon */
            appInfo.sourceDir = absPath;
            appInfo.publicSourceDir = absPath;
            String appName = pm.getApplicationLabel(appInfo).toString();// 得到应用名 
            String packageName = appInfo.packageName; // 得到包名
            version = pkgInfo.versionName; // 得到版本信息
            /* icon1和icon2其实是一样的 */
            //获取u盘里面的文件图标会导致文件占用
            Drawable icon1 = pm.getApplicationIcon(appInfo);// 得到图标信息
            Drawable icon2 = appInfo.loadIcon(pm);
            String pkgInfoStr = String.format("PackageName:%s, Vesion: %s, AppName: %s", packageName, version, appName);
            Log.i(MainActivity.TAG, String.format("PkgInfo: %s", pkgInfoStr));
        }
        return appInfo;
    }

将以下这两行注释掉就可以了：

Drawable icon1 = pm.getApplicationIcon(appInfo);// 得到图标信息
Drawable icon2 = appInfo.loadIcon(pm);