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首页 / 移动开发 / Android / 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 { @Overrideprotected 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; @Overrideprotected 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 { @Overridepublic 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(); }} } @Overrideprotected 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; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_receive); InitView();} @Overrideprotected 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);} @Overridepublic 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ActivityIntent 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; @Overrideprotected 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idBundle 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"> <TextViewandroid: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" /><Buttonandroid: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"/><Buttonandroid: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"><LinearLayoutandroid: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"> <TextViewandroid: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"/> <ListViewandroid: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"> <TextViewandroid: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" /> <TableLayoutandroid: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。