Android短信备份及数据插入实现代码解析

实现备份短信到xml文件和像短信中插入一条数据

一、实现短信将备份到xml文件中

在布局文件中定义一个按钮，定义点击事件为copyclick

mainactivity.java：

package com.lgqrlchinese.heima76android_copysms;

import android.manifest;
import android.content.pm.packagemanager;
import android.database.cursor;
import android.net.uri;
import android.os.environment;
import android.support.v4.app.activitycompat;
import android.support.v4.content.contextcompat;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.util.xml;
import android.view.view;
import android.widget.toast;

import org.xmlpull.v1.xmlserializer;

import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;

public class mainactivity extends appcompatactivity {
  //动态获取权限
  static final string[] permission = new string[]{
      manifest.permission.read_sms,
      manifest.permission.write_external_storage,
  };

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);

    //动态获取权限
    mypermission();
  }

  //点击按钮查询短信数据库内容，然后备份
  public void copyclick(view view) {

    try {
      //获取xml序列化实例
      xmlserializer serializer = xml.newserializer();
      //设置序列化参数
      file file = new file(environment.getexternalstoragedirectory().getpath(), "smsbackup.xml");
      fileoutputstream fos = new fileoutputstream(file);
      serializer.setoutput(fos, "utf-8");
      //开始写xml文档的开头
      serializer.startdocument("utf-8", true);
      //开始写根节点
      serializer.starttag(null, "smss");

      //短信数据库内容也通过内容提供者暴露出来，所以我们只需要通过内容解析者去操作数据库
      uri uri = uri.parse("content://sms/");
      cursor cursor = getcontentresolver().query(uri, new string[]{"address", "date", "body"}, null, null, null);
      while (cursor.movetonext()) {
        string address = cursor.getstring(0);
        string date = cursor.getstring(1);
        string body = cursor.getstring(2);

        //写sms节点
        serializer.starttag(null, "sms");

        //写address节点
        serializer.starttag(null, "address");
        serializer.text(address);
        serializer.endtag(null, "address");

        //写body节点
        serializer.starttag(null, "body");
        serializer.text(body);
        serializer.endtag(null, "body");

        //写date节点
        serializer.starttag(null, "date");
        serializer.text(date);
        serializer.endtag(null, "date");

        serializer.endtag(null, "sms");

      }

      serializer.endtag(null, "smss");
      serializer.enddocument();


    } catch (filenotfoundexception e) {
      e.printstacktrace();
      system.out.println("异常1");
    } catch (ioexception e) {
      e.printstacktrace();
      system.out.println("异常2");
    }


  }

  //动态获取权限
  public void mypermission() {
    if (contextcompat.checkselfpermission(this, manifest.permission.read_contacts) != packagemanager.permission_granted) {
      //android 6.0申请权限
      activitycompat.requestpermissions(this, permission, 1);
    } else {
      toast.maketext(this, "成功", toast.length_short).show();
    }
  }

}

当然权限是必要的

 <uses-permission android:name="android.permission.read_sms"/>
 <uses-permission android:name="android.permission.write_external_storage"/>

这样就在sd卡根目录备份了xml文件

在真机6.0测试中遇到存储address崩溃问题，调试好久。先打印addredss，没有问题；存储死数据没有问题，最后发现在输出打印室有个address为null。查看手机，是因为有个短信草稿，我想了两个都能想到的的解决办法：

1.删除或发送手机里的草稿

2.在代码中进行判断

if (address != null) {

          serializer.starttag(null, "address");
          serializer.text(address);
          serializer.endtag(null, "address");
        } else {
          serializer.text("这是草稿");
        }

二、向短信的数据库中插入数据（5.0及之后就不允许外部应用修改，直允许读取，不做过多记录）

import android.manifest;
import android.content.contentvalues;
import android.content.pm.packagemanager;
import android.net.uri;
import android.support.v4.app.activitycompat;
import android.support.v4.content.contextcompat;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.toast;

public class mainactivity extends appcompatactivity {
  //动态获取权限
  static final string[] permission = new string[]{
      manifest.permission.read_sms,
  };

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    mypermission();
  }

  //点击按钮在短信数据库插入数据
  public void insertclick(view view) {
    uri uri = uri.parse("ocntent://sms");
    contentvalues values = new contentvalues();
    values.put("address", "17865318803");
    values.put("body", "我是你的影子");
    values.put("date", system.currenttimemillis());
    getcontentresolver().insert(uri, values);
  }

  //动态获取权限
  public void mypermission() {
    if (contextcompat.checkselfpermission(this, manifest.permission.read_contacts) != packagemanager.permission_granted) {
      //android 6.0申请权限
      activitycompat.requestpermissions(this, permission, 1);
    } else {
      toast.maketext(this, "成功", toast.length_short).show();
    }
  }
}

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