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

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

try {
File file = new File("/sdcard/test.txt");
FileInputStream inStream = new FileInputStream(file);
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024*5];
int length = -1;
while((length = inStream.read(buffer)) != -1 ){
outStream.write(buffer, 0, length);
}
outStream.close();
inStream.close();
String txt= outStream.toString();

} catch (IOException e){
setTitle(e.toString());
}

5.写通讯录

ContentValues values = new ContentValues();
Uri rawContactUri = getContentResolver().insert(RawContacts.CONTENT_URI, values);
long rawContactId = ContentUris.parseId(rawContactUri);
values.clear();
values.put(Data.RAW_CONTACT_ID, rawContactId);
values.put(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE);
values.put(StructuredName.GIVEN_NAME, name);
getContentResolver().insert(Data.CONTENT_URI, values);
values.clear();
values.put(Data.RAW_CONTACT_ID, rawContactId);
values.put(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE);
values.put(Phone.NUMBER, num);
values.put(Phone.TYPE, Phone.TYPE_HOME);
getContentResolver().insert(Data.CONTENT_URI, values);