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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();

}

}

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