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:
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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:
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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:
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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=+8615671562394address, 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:
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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:
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<?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:
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<?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:
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<?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:
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<?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。
