Android短信的备份

首先需要加入必用的权限：

android.permission.WRITE_SMS

android.permission.READ_SMS

android.permission.WRITE_EXTERNAL_STORAGE

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="click"
        android:text="备份所有的短信" />

</RelativeLayout>

 备用短信的方法类：

package com.example.duduanxing.domain;

public class dxxx {

	private long date;
	private int type;
	private String body;
	private String address;
	private int id;
	public dxxx() {

	}

	public dxxx(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 dxxx(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 int getId() {
		return id;
	}

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

	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;
	}

}

调用备份短信的方法类：

package com.example.duduanxing;

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

import org.xmlpull.v1.XmlSerializer;

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

import com.example.duduanxing.domain.dxxx;

public class SmsUtils {
	/**
	 * @param dxxx短信的集合
	 * @param context上下文
	 */
	public static void backUpSms(List<dxxx> dxxx, Context context) {
		try {
			XmlSerializer serializer = Xml.newSerializer();
			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 (dxxx info : dxxx) {
				serializer.startTag(null, "smss");
				serializer.attribute(null, "id", info.getId() + "");

				serializer.startTag(null, "body");
				serializer.text(info.getBody());
				serializer.endTag(null, "body");

				serializer.startTag(null, "address");
				serializer.text(info.getAddress());
				serializer.endTag(null, "address");

				serializer.startTag(null, "type");
				serializer.text(info.getType() + "");
				serializer.endTag(null, "type");

				serializer.startTag(null, "date");
				serializer.text(info.getDate() + "");
				serializer.endTag(null, "date");

				serializer.endTag(null, "smss");
			}
			serializer.endTag(null, "smss");
			serializer.endDocument();
			os.close();
			Toast.makeText(context, "备份成功", 0).show();
		} catch (IOException e) {
			e.printStackTrace();
			Toast.makeText(context, "澶囦唤澶辫触", 0).show();
		}
	}
}

主类：

package com.example.duduanxing;

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

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

import com.example.duduanxing.domain.dxxx;

public class MainActivity extends Activity {

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

	public void click(View view) {
		// 获取全部的路径
		Uri uri = Uri.parse("content://sms/");
		// 得到系统的中间人
		ContentResolver resolver = getContentResolver();
		// 路径、获取哪些列的信息、选择条件、参数、是否排序
		Cursor cursor = resolver.query(uri, new String[] { "address", "date",
				"type", "body" }, null, null, null);
		List<dxxx> dxxxs = new ArrayList<dxxx>();
		
		while (cursor.moveToNext()) {
			String address = cursor.getString(0);
			long date = cursor.getLong(1);
			int type = cursor.getInt(2);
			String body = cursor.getString(3);
			dxxx dxxx = new dxxx(date, type, body, address);
			dxxxs.add(dxxx);
			/*
			 * System.out.println("address" + address);
			 * System.out.println("date" + date); System.out.println("type" +
			 * type); System.out.println("body" + body);
			 * System.out.println("--------------------");
			 */

		}
		cursor.close();
		//备份的集合、上下文
		SmsUtils.backUpSms(dxxxs, this);
	}
}