Android 短信的备份

接着上文《Android 内容提供者的实现》，继续实战

打开File Exploer，找到mmssms.db数据库，导出

打开mmssms.db

新建项目，布局如下：

<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"
    tools:context=".MainActivity" >

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

</RelativeLayout>

代码如下：

package com.wuyudong.readsms;

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

public class MainActivity extends Activity {

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

    public void click(View view) {
        // content://sms/
        Uri uri = Uri.parse("content://sms/");
        ContentResolver resolver = getContentResolver();
        Cursor cursor = resolver.query(uri, new String[] { "address", "date",
                "type", "body" }, null, null, null);
        while (cursor.moveToNext()) {
            String address = cursor.getString(0);
            String date = cursor.getString(1);
            String type = cursor.getString(2);
            String body = cursor.getString(3);
            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();
    }

}

运行之，提示错误：权限问题。于是添加权限android.permission.READ_SMS和android.permission.WRITE_SMS

再次运行，搞定，成功读取系统短信

接下来继续修改程序，使之完成短信的备份功能

新建文件smsInfo.java

package com.wuyudong.domain;
public class smsInfo {
    private String body;
    private String date;
    private String type;
    private String address;

    public smsInfo(String body, String date, String type, String address) {
        super();
        this.body = body;
        this.date = date;
        this.type = type;
        this.address = address;
    }
    public String getBody() {
        return body;
    }

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

    public String getDate() {
        return date;
    }

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

    public String getType() {
        return type;
    }

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

    public String getAddress() {
        return address;
    }

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

新建SmsUtils.java

package com.wuyudong.readsms;

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

import org.xmlpull.v1.XmlSerializer;

import com.wuyudong.domain.smsInfo;

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

public class SmsUtils {
    /**
     *
     * @param smsInfos 短信的集合
     * @param context 上下文
     */
    public static void backUpSms(List<smsInfo> smsInfos, Context context){
         File file = new File(Environment.getExternalStorageDirectory(),
                    "backup1.xml");
            try {
                FileOutputStream fos = new FileOutputStream(file);
                // 获取xml序列化器
                XmlSerializer xs = Xml.newSerializer();
                xs.setOutput(fos, "utf-8");
                //生成xml头
                xs.startDocument("utf-8", true);
                //添加xml根节点
                xs.startTag(null, "message");
                for (smsInfo info : smsInfos) {
                    xs.startTag(null, "sms");
                    xs.startTag(null, "body");
                    xs.text(info.getBody());
                    xs.endTag(null, "body");
                    xs.startTag(null, "date");
                    xs.text(info.getDate());
                    xs.endTag(null, "date");
                    xs.startTag(null, "address");
                    xs.text(info.getAddress());
                    xs.endTag(null, "address");
                    xs.startTag(null, "type");
                    xs.text(info.getType());
                    xs.endTag(null, "type");
                    xs.endTag(null, "sms");
                }
                xs.endTag(null, "message");
                //生成xml头
                xs.endDocument();
                fos.close();
                Toast.makeText(context, "备份成功", 0).show();

            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Toast.makeText(context, "备份失败", 0).show();
            }
    }
}

添加权限：android.permission.WRITE_EXTERNAL_STORAGE

MainActivity.java中的代码如下：

package com.wuyudong.readsms;

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

import com.wuyudong.domain.smsInfo;

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

public class MainActivity extends Activity {

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

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

}

运行项目后，生成backup1.xml文件，打开后

<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<message>
    <sms>
        <body>ggg</body>
        <date>1466043889225</date>
        <address>1223</address>
        <type>1</type>
    </sms>
    <sms>
        <body>dsfgfdg</body>
        <date>1466043867803</date>
        <address>34543</address>
        <type>1</type>
    </sms>
……………………
……………………
……………………
</message>