[android] 短信的备份

使用ddms给模拟器发送几条短信,找到短信数据库导出

/data/data/com.android.providers.telephony/databases/mmssms.db

数据库字段:address(手机号),date(日期),type1接收,2发送),body(内容)

 

在系统的全部源代码中找到packages/providers/TelephonyProvider

查看清单文件,找到provider节点,

看到android:readPermisssion=”android.permission.READ_SMS” 

android:writePermission=”android.permission.WRITE_SMS” 权限

找到TelephonyProvider类里的satic静态代码块,看到规则部分,最简单的content://sms/

 

调用Uri类的parse(string) 方法,获取到Uri对象

调用getContentResolver()方法,获取ContentResolver对象,中间人对象

调用ContentResolver对象的query(uri,projection,selection,selectArgs,sortOrder)方法,得到Cursor对象,参数:projectionString[] 查询字段,条件,参数,排序

while循环Cursor对象,调用Cursor对象的moveToNext() ,调用Cursor对象的getString(),调用Cursor对象的getClumnIndex()

数据中日期date字段是时间戳毫秒值

在清单文件中定义一下权限

 

当短信内容比较少的时候没问题,多的时候会有问题,应该是遍读遍备份。

根据xml文件的序列化那节,完成保存到文件中。保存到sd卡的时候也要权限

activity:

 

package com.tsh.backsmstrue;

import java.util.ArrayList;
import java.util.List;

import com.tsh.backsmstrue.domain.SmsInfo;
import com.tsh.backsmstrue.utils.SmsUtil;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    /**
     * 备份短信
     * @param v
     */
    public void backupSms(View v){
        Uri uri=Uri.parse("content://sms/");
        ContentResolver resolver=getContentResolver();
        String[] projection=new String[]{"address","date","type","body"};
        Cursor cursor=resolver.query(uri, projection, null, null, null);
        List<SmsInfo> smss=new ArrayList<SmsInfo>();
        while(cursor.moveToNext()){
            String body=cursor.getString(cursor.getColumnIndex("body"));
            System.out.println(body);
            System.out.println("===========");
            SmsInfo smsinfo=new SmsInfo();
            smsinfo.setAddress("110");
            smsinfo.setMessage(body);
            smss.add(smsinfo);
        }
        SmsUtil.backSms2(smss, this);
        cursor.close();
    }
}

 

工具类:

package com.tsh.backsmstrue.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.util.List;

import org.xmlpull.v1.XmlSerializer;

import com.tsh.backsmstrue.domain.SmsInfo;

import android.content.Context;
import android.os.Environment;
import android.util.Xml;
import android.view.View;
import android.widget.Toast;


public class SmsUtil {
    /**
     * 备份短信第二种
     * @param v
     */
    public static void backSms2(List<SmsInfo> smsInfos,Context context){
        XmlSerializer serializer=Xml.newSerializer();
        try {
            File file=new File(Environment.getExternalStorageDirectory(),"backup2.xml");
            FileOutputStream os=new FileOutputStream(file);
            serializer.setOutput(os, "utf-8");
            serializer.startDocument("utf-8", true);
            serializer.startTag(null, "smss");
            for(SmsInfo sms:smsInfos){
                serializer.startTag(null, "sms");
                serializer.attribute(null, "tel", sms.getAddress());
                serializer.text(sms.getMessage());
                serializer.endTag(null, "sms");
            }
            serializer.endTag(null, "smss");
            serializer.endDocument();
            os.close();
            Toast.makeText(context, "保存成功", 0).show();
        } catch (Exception e) {
            Toast.makeText(context, "保存失败", 0).show();
        }
    }
}

 

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