MainActivity

package com.example.zong.testcopy;

import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.support.v4.content.ContentResolverCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void click(View view) {
        Uri uri = Uri.parse("content://sms/");
        ContentResolver resolver = getContentResolver();
        Cursor cursor = resolver.query(uri, new String[]{"address", "date", "type", "body"}, null, null, null);
        List<SmsInfo> smsInfos = new ArrayList<SmsInfo>();
        while (cursor.moveToNext()) {
            String address = cursor.getString(0);
            long date = cursor.getLong(1);
            int type = cursor.getInt(2);
            String body = cursor.getString(3);
            SmsInfo smsInfo = new SmsInfo(date, type, body, address);
            smsInfos.add(smsInfo);
        }

        cursor.close();
        SmsUtils.backUpSms(smsInfos, this);
    }

}

SmsInfo

package com.example.zong.testcopy;


public class SmsInfo {
    private long date;
    private int type;
    private String body;
    private String address;
    private int id;

    public int getId(){
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
    public SmsInfo(){

    }

    public SmsInfo(long date,int type,String body,String address,int id){
        this.date=date;
        this.type=type;
        this.body=body;
        this.address=address;
        this.id=id;
    }

    public SmsInfo(long date,int type,String body,String address){
        this.date=date;
        this.type=type;
        this.body=body;
        this.address=address;
    }

    public long getDate() {
        return date;
    }

    public void setDate(long date) {
        this.date = date;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public String getBody() {
        return body;
    }

    public void setBody(String body) {
        this.body = body;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

SmsUtils

package com.example.zong.testcopy;

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

import org.xmlpull.v1.XmlSerializer;

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

/**
 * Created by Zong on 2017/6/22.
 */
public class SmsUtils {
    public static void backupSms(List<SmsInfo> smsInfos, Context context) throws IOException {
        try {
            XmlSerializer serialier = Xml.newSerializer();
            File file = new File(Environment.getExternalStoragePublicDirectory(), "sms.xml");
            FileOutputStream os = new FileOutputStream(file);
            serialier.setOutput(os, "utf-8");
            serialier.startDocument("utf-8", true);
            serialier.startTag(null, "smss");
            for (SmsInfo info : smsInfos) {
                serialier.startTag(null, "smss");
                serialier.attribute(null, "id", info.getId() + "");

                serialier.startTag(null, "body");
                serialier.text(info.getBody());
                serialier.endTag(null, "body");
                serialier.startTag(null, "address");
                serialier.text(info.getAddress());
                serialier.endTag(null, "address");
                serialier.startTag(null, "type");
                serialier.text(info.getType() + "");
                serialier.endTag(null, "type");
                serialier.startTag(null, "date");
                serialier.text(info.getDate() + "");
                serialier.endTag(null, "date");

                serialier.endTag(null, "sms");
            }
            serialier.endTag(null, "sms");
            serialier.endDocument();
            os.close();
            Toast.makeText(context, "备份成功", 0).show();
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(context, "备份失败", 0).show();
        }
    }
}

AndroidMainFest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.zong.testcopy">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

    <uses-permission android:name="android.permission.READ_SMS"/>
    <uses-permission android:name="android.permission.WRITE_SMS"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"

</manifest>

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