最近在做一个Android 备份软件，刚刚把短信的备份与恢复做完。短信的备份主要是对数据库mmssms.db的sms表进行数据的导出，当然这里是跨应用的，所以要使用contendResolver来访问，最后把数据导出成xml文件。恢复时再对xml文件解析。备份时注意，不要备份thread_id字段，否则恢复时，手机中查看不到恢复的短信。
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在 2011年LinuxIDC.com\10月\10月\Android 短信的备份与恢复（导入导出）
短信导出源码：
package cn.sqk.sms; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.PrintWriter; import java.text.SimpleDateFormat; import java.util.Date; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.xmlpull.v1.XmlSerializer; import cn.sqk.constants.SmsField; import android.content.ContentResolver; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteException; import android.net.Uri; import android.os.Environment; import android.util.Log; import android.util.Xml; import android.widget.Toast; public class ExportSmsXml { Context context; public static final String SMS_URI_ALL = "content://sms/"; private FileOutputStream outStream = null; private XmlSerializer serializer; public ExportSmsXml(Context context) { this.context = context; } public void xmlStart() { String path = Environment.getExternalStorageDirectory().getPath() + "/exportSms"; File file = new File(path); if (!file.exists()) { file.mkdirs(); } File file2 = new File(path, "message.xml"); try { outStream = new FileOutputStream(file2); serializer = Xml.newSerializer(); serializer.setOutput(outStream, "UTF-8"); serializer.startDocument("UTF-8", true); serializer.startTag(null, "sms"); } catch (Exception e) { e.printStackTrace(); } } public boolean createXml() throws Exception { this.xmlStart(); Cursor cursor = null; try { ContentResolver conResolver = context.getContentResolver(); String[] projection = new String[] { SmsField.ADDRESS, SmsField.PERSON, SmsField.DATE, SmsField.PROTOCOL, SmsField.READ, SmsField.STATUS, SmsField.TYPE, SmsField.REPLY_PATH_PRESENT, SmsField.BODY,SmsField.LOCKED,SmsField.ERROR_CODE, SmsField.SEEN }; // type=1是收件箱，==2是发件箱;read=0表示未读，read=1表示读过，seen=0表示未读，seen=1表示读过 Uri uri = Uri.parse(SMS_URI_ALL); cursor = conResolver.query(uri, projection, null, null, "_id asc"); if (cursor.moveToFirst()) { // 查看数据库sms表得知 subject和service_center始终是null所以这里就不获取它们的数据了。 String address; String person; String date; String protocol; String read; String status; String type; String reply_path_present; String body; String locked; String error_code; String seen; do { // 如果address == null，xml文件中是不会生成该属性的,为了保证解析时，属性能够根据索引一一对应，必须要保证所有的item标记的属性数量和顺序是一致的 address = cursor.getString(cursor.getColumnIndex(SmsField.ADDRESS)); if (address == null) { address = ""; } person = cursor.getString(cursor.getColumnIndex(SmsField.PERSON)); if (person == null) { person = ""; } date = cursor.getString(cursor.getColumnIndex(SmsField.DATE)); if (date == null) { date = ""; } protocol = cursor.getString(cursor.getColumnIndex(SmsField.PROTOCOL)); if (protocol == null) {// 为了便于xml解析 protocol = ""; } read = cursor.getString(cursor.getColumnIndex(SmsField.READ)); if (read == null) { read = ""; } status = cursor.getString(cursor.getColumnIndex(SmsField.STATUS)); if (status == null) { status = ""; } type = cursor.getString(cursor.getColumnIndex(SmsField.TYPE)); if (type == null) { type = ""; } reply_path_present = cursor.getString(cursor.getColumnIndex(SmsField.REPLY_PATH_PRESENT)); if (reply_path_present == null) {// 为了便于XML解析 reply_path_present = ""; } body = cursor.getString(cursor.getColumnIndex(SmsField.BODY)); if (body == null) { body = ""; } locked = cursor.getString(cursor.getColumnIndex(SmsField.LOCKED)); if (locked == null) { locked = ""; } error_code = cursor.getString(cursor.getColumnIndex(SmsField.ERROR_CODE)); if (error_code == null) { error_code = ""; } seen = cursor.getString(cursor.getColumnIndex(SmsField.SEEN)); if (seen == null) { seen = ""; } // 生成xml子标记 // 开始标记 serializer.startTag(null, "item"); // 加入属性 serializer.attribute(null, SmsField.ADDRESS, address); serializer.attribute(null, SmsField.PERSON, person); serializer.attribute(null, SmsField.DATE, date); serializer.attribute(null, SmsField.PROTOCOL, protocol); serializer.attribute(null, SmsField.READ, read); serializer.attribute(null, SmsField.STATUS, status); serializer.attribute(null, SmsField.TYPE, type); serializer.attribute(null, SmsField.REPLY_PATH_PRESENT, reply_path_present); serializer.attribute(null, SmsField.BODY, body); serializer.attribute(null, SmsField.LOCKED, locked); serializer.attribute(null, SmsField.ERROR_CODE, error_code); serializer.attribute(null, SmsField.SEEN, seen); // 结束标记 serializer.endTag(null, "item"); } while (cursor.moveToNext()); } else { return false; } } catch (SQLiteException ex) { ex.printStackTrace(); Log.d("SQLiteException:", ex.getMessage()); }finally { if(cursor != null) { cursor.close();//手动关闭cursor，及时回收 } } serializer.endTag(null, "sms"); serializer.endDocument(); outStream.flush(); outStream.close(); return true; } }