根据app主包名判断某个apk是否存在

/**     *      * @param context     * @param packageName 主包名 例如com.test.example     * @return     */    public boolean checkApkExist(Context context, String packageName) {        if (TextUtils.isEmpty(packageName)) {            return false;        }        try {            PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);            return true;        } catch (PackageManager.NameNotFoundException e) {            return false;        }    }