android随笔14——短信备份以及xml解…

来源：互联网发布：java枚举的声明编辑：程序博客网时间：2024/06/08 19:14

public class SmsUtils {

public static void backupSms(Context ctx){

//备份短信之前先判断是否有SD卡,以及SD卡是否足够

  if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
   //没有SD卡
   Toast.makeText(ctx,"没有SD卡,无法备份短信", 0).show();
   return;
  }
  //判断SD卡存储空间是否足够
  File sdFile =Environment.getExternalStorageDirectory();
  if(sdFile.getFreeSpace()<10*1024*1024){
   Toast.makeText(ctx,"SD卡空间不足,无法备份短信", 0).show();
   return;
  }

Uri uri = Uri.parse("Content://sms");//获得一个URI对象

String[] projection = newString[]{"address","date","type","body"};//指定从db文件中哪几列获取值

Cursor cursor =ctx.getContentResolver().query(uri,projection,null,null,null);

try {

XmlSerializer serializer = Xml.newSerializer();

String path =Environment.getExternalStorageDirectory().getAbsolutePath()+"//backup_sms_z10.xml";

serializer.setOutput(newFileOutputStream(path),"UTF-8");

serializer.startDocument("UTF-8", true);//true 是说明这是一个单独的文件

serializer.startTag(null, "smss");//

serializer.attribute(null,"size",""+cursor.getCount());//cursor.getCount()必须为字符串

//查询数据库,返回cursor指向,第一行的上一行

while(cursor.moveToNext()){

String address = cursor.getString(0);

String date = cursor.getString(1);

String type = cursor.getString(2);

String body = cursor.getString(3);

serializer.startTag(null,"sms");

//address

serializer.startTag(null,"address");

serializer.text(address);

serializer.endTag(null, "address");

// date

serializer.startTag(null,"date");

serializer.text(date);

serializer.endTag(null, "date");

// type

serializer.startTag(null,"type");

serializer.text(type);

serializer.endTag(null, "type");

// body

serializer.startTag(null,"body");

serializer.text(body);

serializer.endTag(null, "body");

serializer.endTag(null, "sms");

}

serializer.endTag(null, "serializer");//

serializer.endDocument();

serializer.flush(); //刷新

} catch (Exception e) {

e.printStackTrace();

}

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