Android实现短信加密功能（发送加密短信、解密本地短信）

短信加密此类功能由于新手学习的需求量较小，所以在网上很少有一些简单的demo供新手参考。小编做到此处也是花了比较多的时间自我构思，具体的过程也是不过多描述了，讲一下demo的内容。

 

demo功能：

1、可以发送短信并且加密（通过改变string中的char）

2、能够查看手机中的短信

3、能够给收到的加密短信解密。

涉及到的知识点：

1、intent bundle传递

2、contentresolver获取手机短信

3、listveiw与simpleadapter

4、发送短信以及为发送短信设置要监听的广播

遇到的问题：

1、发送短信字符过长会导致发送失败

解决方法：设置发送每条短信为70个字以内。

原理：每条短信限制160字符以内，每个汉字是2个字符。平时我们发送短信几乎不限长度，是因为一旦超过了单条短信的长度，手机会自动分多条发送，然后接收方分多条接收后整合在一起显示。

代码：

mainactivity:

import android.app.activity;
import android.content.intent;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.button;

public class mainactivity extends activity {

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

 initview();
 }

 private void initview() {
 button send=(button)findviewbyid(r.id.bt_send);
 button receive=(button)findviewbyid(r.id.bt_receive);

 send.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view view) {
  intent intent=new intent(mainactivity.this,sendactivity.class);
  startactivity(intent);
  }
 });

 receive.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view view) {
  intent intent=new intent(mainactivity.this,receiveactivity.class);
  startactivity(intent);
  }
 });
 }
}

sendactivity:

import android.app.activity;
import android.app.pendingintent;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.os.bundle;
import android.telephony.smsmanager;
import android.util.log;
import android.view.view;
import android.widget.button;
import android.widget.edittext;
import android.widget.toast;

/**
 * created by 佳佳 on 2015/12/21.
 */
public class sendactivity extends activity {

 private intentfilter sendfilter;
 private sendstatusreceiver sendstatusreceiver;

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

 initview();
 }

 private void initview() {
 button cancel = (button) findviewbyid(r.id.cancel_edit);
 button send = (button) findviewbyid(r.id.send_edit);
 final edittext phone = (edittext) findviewbyid(r.id.phone_edit_text);
 final edittext msginput = (edittext) findviewbyid(r.id.content_edit_text);

 //为发送短信设置要监听的广播
 sendfilter = new intentfilter();
 sendfilter.addaction("sent_sms_action");
 sendstatusreceiver = new sendstatusreceiver();
 registerreceiver(sendstatusreceiver, sendfilter);

 send.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
  toast.maketext(sendactivity.this, "加密发送中，请稍后...", toast.length_short).show();
  //接收edittext中的内容,并且进行加密
  //倘若char+8超出了表示范围，则把原字符发过去
  string address = phone.gettext().tostring();
  string content = msginput.gettext().tostring();
  string contents = "";
  for (int i = 0; i < content.length(); i++) {
   try {
   contents += (char) (content.charat(i) + 8);
   }catch (exception e) {
   contents += (char) (content.charat(i));
   }
  }

  //log.i("hahaha",contents);

  //发送短信
  //并使用sendtextmessage的第四个参数对短信的发送状态进行监控
  smsmanager smsmanager = smsmanager.getdefault();
  intent sentintent = new intent("sent_sms_action");
  pendingintent pi = pendingintent.getbroadcast(
   sendactivity.this, 0, sentintent, 0);
  smsmanager.sendtextmessage(address, null,
   contents.tostring(), pi, null);
  }
 });

 cancel.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view view) {
  finish();
  }
 });
 }

 class sendstatusreceiver extends broadcastreceiver {

 @override
 public void onreceive(context context, intent intent) {
  if (getresultcode() == result_ok) {
  //发送成功
  toast.maketext(context, "send succeeded", toast.length_long)
   .show();

  intent intent1 = new intent(sendactivity.this, receiveactivity.class);
  startactivity(intent1);
  finish();
  } else {
  //发送失败
  toast.maketext(context, "send failed", toast.length_long)
   .show();
  }
 }

 }

 @override
 protected void ondestroy() {
 super.ondestroy();
 //在activity摧毁的时候停止监听
 unregisterreceiver(sendstatusreceiver);
 }
}

receiveactivity:

import android.app.activity;
import android.content.intent;
import android.database.cursor;
import android.net.uri;
import android.os.bundle;
import android.util.log;
import android.view.view;
import android.widget.adapterview;
import android.widget.listview;
import android.widget.simpleadapter;
import android.widget.textview;

import java.text.simpledateformat;
import java.util.arraylist;
import java.util.date;
import java.util.hashmap;
import java.util.list;
import java.util.map;


public class receiveactivity extends activity implements adapterview.onitemclicklistener{
 private textview tv_address;
 private textview tv_body;
 private textview tv_time;
 private listview listview;
 private list<map<string, object>> datalist;
 private simpleadapter simple_adapter;

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

 initview();
 }

 @override
 protected void onstart() {
 super.onstart();
 refreshlist();
 }


 private void initview() {
 tv_address = (textview) findviewbyid(r.id.tv_address);
 tv_body = (textview) findviewbyid(r.id.tv_body);
 tv_time = (textview) findviewbyid(r.id.tv_time);
 listview = (listview) findviewbyid(r.id.list_receive);
 datalist = new arraylist<map<string, object>>();

 listview.setonitemclicklistener(this);
 }

 private void refreshlist() {
 //从短信数据库读取信息
 uri uri = uri.parse("content://sms/");
 string[] projection = new string[]{"address", "body", "date"};
 cursor cursor = getcontentresolver().query(uri, projection, null, null, "date desc");
 startmanagingcursor(cursor);

 //此处为了简化代码提高效率，仅仅显示20条最近短信
 for (int i = 0; i < 20; i++) {
  //从手机短信数据库获取信息
  if(cursor.movetonext()) {
  string address = cursor.getstring(cursor.getcolumnindex("address"));
  string body = cursor.getstring(cursor.getcolumnindex("body"));
  long longdate = cursor.getlong(cursor.getcolumnindex("date"));
  //将获取到的时间转换为我们想要的方式
  simpledateformat dateformat = new simpledateformat("yyyy-mm-dd hh:mm:ss");
  date d = new date(longdate);
  string time = dateformat.format(d);


  map<string, object> map = new hashmap<string, object>();
  map.put("address", address);
  map.put("body", body+"body");
  map.put("time", time+" time");
  datalist.add(map);
  }
 }

 simple_adapter = new simpleadapter(this, datalist, r.layout.activity_receive_list_item,
  new string[]{"address", "body", "time"}, new int[]{
  r.id.tv_address, r.id.tv_body, r.id.tv_time});
 listview.setadapter(simple_adapter);
 }

 @override
 public void onitemclick(adapterview<?> adapterview, view view, int i, long l) {
 //获取listview中此个item中的内容
 //content的内容格式如下
 //{body=[b@43c2da70body, address=[phone]address, time=2015-12-24 11:55:50time}
 string content = listview.getitematposition(i) + "";
 string body = content.substring(content.indexof("body=") + 5,
  content.indexof("body,"));
 //log.i("hahaha",body);
 string address = content.substring(content.indexof("address=") + 8,
  content.lastindexof(","));
 //log.i("hahaha",address);
 string time = content.substring(content.indexof("time=") + 5,
  content.indexof(" time}"));
 //log.i("hahaha",time);

 //使用bundle存储数据发送给下一个activity
 intent intent=new intent(receiveactivity.this,receiveactivity_show.class);
 bundle bundle = new bundle();
 bundle.putstring("body", body);
 bundle.putstring("address", address);
 bundle.putstring("time", time);
 intent.putextras(bundle);
 startactivity(intent);

 }
}

receiveactivity_show:

import android.app.activity;
import android.os.bundle;
import android.widget.textview;

public class receiveactivity_show extends activity {
 private textview address_show;
 private textview time_show;
 private textview early_body_show;
 private textview late_body_show;

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

 initview();
 }

 private void initview() {

 address_show = (textview) findviewbyid(r.id.address_show);
 time_show = (textview) findviewbyid(r.id.time_show);
 early_body_show = (textview) findviewbyid(r.id.early_body_show);
 late_body_show = (textview) findviewbyid(r.id.late_body_show);

 //接收内容和id
 bundle bundle = this.getintent().getextras();
 string body = bundle.getstring("body");
 string time = bundle.getstring("time");
 string address = bundle.getstring("address");


 address_show.settext(address);
 early_body_show.settext(body);
 time_show.settext(time);

 //对短信消息进行解密后显示在textview中
 //倘若char+8超出了表示范围，则直接按照原字符解析
 string real_content = "";
 for (int i = 0; i < body.length(); i++) {
  try {
  char textchar=(char) (body.charat(i) + 8);
  real_content += (char) (body.charat(i) - 8);
  }catch (exception e){
  real_content += (char) (body.charat(i));
  }
 }
 late_body_show.settext(real_content);
 }

}

activity_main:

<?xml version="1.0" encoding="utf-8"?>

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <textview
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="#000"
 android:padding="12dp"
 android:text="加密短信"
 android:textcolor="#fff"
 android:textsize="25sp"
 android:textstyle="bold" />
 <button
 android:layout_margintop="120dp"
 android:id="@+id/bt_send"
 android:layout_width="200dp"
 android:layout_height="80dp"
 android:text="发送加密短信"
 android:layout_gravity="center"
 android:textsize="20dp"/>
 <button
 android:id="@+id/bt_receive"
 android:layout_width="200dp"
 android:layout_height="80dp"
 android:layout_gravity="center"
 android:text="解密本地短信"
 android:textsize="20dp"
 android:layout_below="@+id/bt_send"/>

</linearlayout>

activity_send:

<?xml version="1.0" encoding="utf-8"?>

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">


 <linearlayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 android:padding="10dp">

 <textview
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="加密短信发送"
  android:textcolor="#000"
  android:textsize="35sp" />

 <view
  android:layout_width="match_parent"
  android:layout_height="3dp"
  android:layout_marginbottom="20dp"
  android:background="#cecece" />

 <textview
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="发送至："
  android:textsize="25sp" />

 <edittext
  android:id="@+id/phone_edit_text"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginbottom="10dp"
  android:background="@drawable/edit_text_style"
  android:hint="接收人手机号码"
  android:maxlength="15"
  android:maxlines="1"
  android:textsize="19sp"
  android:singleline="true" />

 <textview
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="发送内容"
  android:textsize="25sp" />

 <edittext
  android:id="@+id/content_edit_text"
  android:layout_width="match_parent"
  android:layout_height="0dp"
  android:layout_weight="1"
  android:background="@drawable/edit_text_style"
  android:gravity="start"
  android:hint="单条短信请保持在70字以内"
  android:maxlength="70"
  android:textsize="19sp"
  />

 <linearlayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_margin="10dp">

  <button
  android:id="@+id/cancel_edit"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:text="取消编辑"
  android:textsize="20sp" />

  <button
  android:id="@+id/send_edit"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  android:text="发 送"
  android:textsize="20sp" />
 </linearlayout>
 </linearlayout>
</linearlayout>

activity_receive:

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent">

 <textview
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:padding="10dp"
 android:text="所有短信"
 android:textcolor="#fff"
 android:background="#000"
 android:textsize="23sp"
 android:textstyle="bold"/>

 <listview
 android:id="@+id/list_receive"
 android:layout_width="match_parent"
 android:layout_height="match_parent"></listview>

</linearlayout>

activity_receive_show:

<?xml version="1.0" encoding="utf-8"?>

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">

 <textview
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="#000"
 android:padding="12dp"
 android:text="短信解密"
 android:textcolor="#fff"
 android:textsize="25sp"
 android:textstyle="bold" />

 <tablelayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 android:padding="10dp"
 android:stretchcolumns="1"
 android:shrinkcolumns="1">

 <tablerow android:layout_margintop="10dp"
  android:layout_width="match_parent"
  >

  <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="号码："
  android:textcolor="#000"
  android:textsize="20sp" />

  <textview
  android:id="@+id/address_show"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="10dp"
  android:background="@drawable/edit_text_style"
  android:maxlines="1"
  android:singleline="true"
  android:textsize="18sp" />
 </tablerow
  >

 <tablerow
  android:layout_width="match_parent"
  android:layout_marginbottom="10dp"
  >

  <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="时间："
  android:textcolor="#000"
  android:textsize="20sp" />

  <textview
  android:id="@+id/time_show"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="10dp"
  android:background="@drawable/edit_text_style"
  android:maxlines="1"
  android:textsize="18sp" />
 </tablerow>

 <tablerow android:layout_marginbottom="10dp"
  android:layout_width="match_parent">

  <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="原文本："
  android:textcolor="#000"
  android:textsize="20sp" />

  <textview
  android:id="@+id/early_body_show"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:background="@drawable/edit_text_style"
  android:minlines="6"
  android:maxlines="6"
  android:textsize="18sp"
  />
 </tablerow>

 <tablerow
  android:layout_width="match_parent">

  <textview
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_marginbottom="5dp"
  android:text="解析后："
  android:textcolor="#000"
  android:textsize="20sp" />

  <textview
  android:id="@+id/late_body_show"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:background="@drawable/edit_text_style"
  android:minlines="6"
  android:maxlines="6"
  android:singleline="false"
  android:textsize="18sp"
  />
 </tablerow>


 </tablelayout>
</linearlayout>

以上就是本文的全部内容，android实现短信加密，实现发送加密短信、解密本地短信，希望对大家的学习有所帮助。