我们备份手机联系人时，导出到SD卡时，会在SD卡中生成一个vcf文件，用于保存联系人姓名，手机号码。
vCard 规范容许公开交换个人数据交换 (Personal Data Interchange PDI)信息，在传统纸质商业名片可找到这些信息。规范定义电子名片（或叫vCard）的格式。
而在Android上使用vcard就要借助第三方包:
将它复制进工程，然后Add jar即可，实现代码很简单，如下：
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) //判断存储卡是否存在 { OutputStreamWriter writer; File file = new File(Environment.getExternalStorageDirectory(),"example.vcf"); //得到存储卡的根路径，将example.vcf写入到根目录下 try { writer = new OutputStreamWriter(new FileOutputStream(file), "UTF-8"); //create a contact VCardComposer composer = new VCardComposer(); ContactStruct contact1 = new ContactStruct(); contact1.name ="John" ; contact1.company = "The Company"; contact1.addPhone(Contacts.Phones.TYPE_MOBILE, "15651865008", null, true); //create vCard representation String vcardString; vcardString = composer.createVCard(contact1, VCardComposer.VERSION_VCARD30_INT); //write vCard to the output stream writer.write(vcardString); // writer.write("/n"); //add empty lines between contacts // repeat for other contacts // ... writer.close(); Toast.makeText(c, "已成功导入SD卡中！", Toast.LENGTH_SHORT).show(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (VCardException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } else{ Toast.makeText(c, "写入失败，SD卡不存在！", Toast.LENGTH_SHORT).show(); }由于要对存储卡做读写操作，所以要加读写权限: