Android发展_备份短信

短信备份的原理
短信备份的原理。是用内容提供者读取短信，然后保存。
public class SmsBackupUtils {

	// 回调接口

	public interface SmsBackupCallback {

		/**

		 * 短信备份前调用

		 * @param total    短信的总条数

		 */

		public void beforeSmsbackup(int total);

		/**

		 * 短信调用中调用

		 * @param progress  短信的进度

		 */

		public void progressSmsbackup(int progress);

	}

	/**

	 * 短信备份的方法,备份到xml文件里,由于xml文件跨平台性强  这是一个耗时操作,应该放在子线程中运行

	 *

	 * @param context 上下文

	 * @param path 备份到哪个路径

	 * @throws Exception

	 */

	public static void smsBackup(Context context, String path,SmsBackupCallback callBack) throws Exception {

		// xml的序列化器

		XmlSerializer serializer = Xml.newSerializer();

		File file = new File(path);

		FileOutputStream fos = new FileOutputStream(file);

		// 设置參数

		serializer.setOutput(fos, "utf-8");

		// 開始

		serializer.startDocument("utf-8", true);

		serializer.startTag(null, "smss");

		ContentResolver resolver = context.getContentResolver();

		Uri uri = Uri.parse("content://sms");// 包括全部短信

		Cursor cursor = resolver.query(uri, new String[] { "address", "date",

				"type", "body" }, null, null, null);

		/*dialog.setMax(cursor.getCount());

		progressBar1.setMax(cursor.getCount());*/

		callBack.beforeSmsbackup(cursor.getCount());

		int progress = 0;

		while (cursor.moveToNext()) {

			serializer.startTag(null, "sms");

			serializer.startTag(null, "address");

			String address = cursor.getString(0);

			serializer.text(address);

			serializer.endTag(null, "address");

			serializer.startTag(null, "date");

			String date = cursor.getString(1);

			serializer.text(date);

			serializer.endTag(null, "date");

			serializer.startTag(null, "type");

			String type = cursor.getString(2);

			serializer.text(type);

			serializer.endTag(null, "type");

			serializer.startTag(null, "body");

			String body = cursor.getString(3);

			serializer.text(body);

			serializer.endTag(null, "body");

			serializer.endTag(null, "sms");

			progress++;

			/*dialog.setProgress(progress);

			progressBar1.setProgress(progress);*/

			callBack.progressSmsbackup(progress);

			SystemClock.sleep(1000);

		}

		cursor.close();

		serializer.endTag(null, "smss");

		serializer.endDocument();

	}

}