Android手机通讯录备份还原代码

最近想写段Android程序玩玩。开发环境 Eclipse ,Android 2.2

开发环境搭建

1.先安装jdk

2.下载安装eclipse

3.下载安装android sdk

4.安装eclipse插件  adt

5.配置 Window > Preferences 中的android sdk路径

6.创建 AVD 

实现方法很简单
1.把通讯录中的联系人，电话号码保存到txt文件中完成备份。
2.读取txt文件，导入到通讯录完成还原。

具体代码
1.添加 通讯录读写权限，存储卡写权限

<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_CONTACTS"></uses-permission>

2.写文件代码

File saveFile=new File("/sdcard/test.txt");
                FileOutputStream outStream;
try {
outStream = new FileOutputStream(saveFile);
       outStream.write(str.getBytes());
       outStream.close();
} catch (Exception e) {

setTitle(e.toString());
}

3.取通讯录联系人

str="";
       Cursor cur = getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null); 
       if (cur.moveToFirst()) { 
           int idColumn  = cur.getColumnIndex(ContactsContract.Contacts._ID); 
           int displayNameColumn = cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME); 
           do { 
              String contactId = cur.getString(idColumn); 
              String disPlayName = cur.getString(displayNameColumn); 
              str+=disPlayName;
              int phoneCount = cur.getInt(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)); 
              if(phoneCount>0){ 
                  Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,ContactsContract.CommonDataKinds.Phone.CONTACT_ID+ " = " + contactId, null, null);
                  int i=0;
                  String phoneNumber;
                  if(phones.moveToFirst()){ 
                      do{ 
                       i++;
                          phoneNumber= phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                          if(i==1)
                          str=str+","+phoneNumber;
                          System.out.println(phoneNumber); 
                      }while(phones.moveToNext()); 
                  } 
              } 
              str+="\r\n";
              } while (cur.moveToNext()); 
       } 
       } 

4.读文件代码